diff --git a/libweave/external/crypto/p224.cc b/libweave/external/crypto/p224.cc
new file mode 100644
index 0000000..11946a9
--- /dev/null
+++ b/libweave/external/crypto/p224.cc
@@ -0,0 +1,758 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// This is an implementation of the P224 elliptic curve group. It's written to
+// be short and simple rather than fast, although it's still constant-time.
+//
+// See http://www.imperialviolet.org/2010/12/04/ecc.html ([1]) for background.
+
+#include "crypto/p224.h"
+
+#include <string.h>
+
+#include "base/sys_byteorder.h"
+
+namespace {
+
+using base::HostToNet32;
+using base::NetToHost32;
+
+// Field element functions.
+//
+// The field that we're dealing with is ℤ/pℤ where p = 2**224 - 2**96 + 1.
+//
+// Field elements are represented by a FieldElement, which is a typedef to an
+// array of 8 uint32's. The value of a FieldElement, a, is:
+//   a[0] + 2**28·a[1] + 2**56·a[1] + ... + 2**196·a[7]
+//
+// Using 28-bit limbs means that there's only 4 bits of headroom, which is less
+// than we would really like. But it has the useful feature that we hit 2**224
+// exactly, making the reflections during a reduce much nicer.
+
+using crypto::p224::FieldElement;
+
+// kP is the P224 prime.
+const FieldElement kP = {
+  1, 0, 0, 268431360,
+  268435455, 268435455, 268435455, 268435455,
+};
+
+void Contract(FieldElement* inout);
+
+// IsZero returns 0xffffffff if a == 0 mod p and 0 otherwise.
+uint32 IsZero(const FieldElement& a) {
+  FieldElement minimal;
+  memcpy(&minimal, &a, sizeof(minimal));
+  Contract(&minimal);
+
+  uint32 is_zero = 0, is_p = 0;
+  for (unsigned i = 0; i < 8; i++) {
+    is_zero |= minimal[i];
+    is_p |= minimal[i] - kP[i];
+  }
+
+  // If either is_zero or is_p is 0, then we should return 1.
+  is_zero |= is_zero >> 16;
+  is_zero |= is_zero >> 8;
+  is_zero |= is_zero >> 4;
+  is_zero |= is_zero >> 2;
+  is_zero |= is_zero >> 1;
+
+  is_p |= is_p >> 16;
+  is_p |= is_p >> 8;
+  is_p |= is_p >> 4;
+  is_p |= is_p >> 2;
+  is_p |= is_p >> 1;
+
+  // For is_zero and is_p, the LSB is 0 iff all the bits are zero.
+  is_zero &= is_p & 1;
+  is_zero = (~is_zero) << 31;
+  is_zero = static_cast<int32>(is_zero) >> 31;
+  return is_zero;
+}
+
+// Add computes *out = a+b
+//
+// a[i] + b[i] < 2**32
+void Add(FieldElement* out, const FieldElement& a, const FieldElement& b) {
+  for (int i = 0; i < 8; i++) {
+    (*out)[i] = a[i] + b[i];
+  }
+}
+
+static const uint32 kTwo31p3 = (1u<<31) + (1u<<3);
+static const uint32 kTwo31m3 = (1u<<31) - (1u<<3);
+static const uint32 kTwo31m15m3 = (1u<<31) - (1u<<15) - (1u<<3);
+// kZero31ModP is 0 mod p where bit 31 is set in all limbs so that we can
+// subtract smaller amounts without underflow. See the section "Subtraction" in
+// [1] for why.
+static const FieldElement kZero31ModP = {
+  kTwo31p3, kTwo31m3, kTwo31m3, kTwo31m15m3,
+  kTwo31m3, kTwo31m3, kTwo31m3, kTwo31m3
+};
+
+// Subtract computes *out = a-b
+//
+// a[i], b[i] < 2**30
+// out[i] < 2**32
+void Subtract(FieldElement* out, const FieldElement& a, const FieldElement& b) {
+  for (int i = 0; i < 8; i++) {
+    // See the section on "Subtraction" in [1] for details.
+    (*out)[i] = a[i] + kZero31ModP[i] - b[i];
+  }
+}
+
+static const uint64 kTwo63p35 = (1ull<<63) + (1ull<<35);
+static const uint64 kTwo63m35 = (1ull<<63) - (1ull<<35);
+static const uint64 kTwo63m35m19 = (1ull<<63) - (1ull<<35) - (1ull<<19);
+// kZero63ModP is 0 mod p where bit 63 is set in all limbs. See the section
+// "Subtraction" in [1] for why.
+static const uint64 kZero63ModP[8] = {
+  kTwo63p35, kTwo63m35, kTwo63m35, kTwo63m35,
+  kTwo63m35m19, kTwo63m35, kTwo63m35, kTwo63m35,
+};
+
+static const uint32 kBottom28Bits = 0xfffffff;
+
+// LargeFieldElement also represents an element of the field. The limbs are
+// still spaced 28-bits apart and in little-endian order. So the limbs are at
+// 0, 28, 56, ..., 392 bits, each 64-bits wide.
+typedef uint64 LargeFieldElement[15];
+
+// ReduceLarge converts a LargeFieldElement to a FieldElement.
+//
+// in[i] < 2**62
+
+// GCC 4.9 incorrectly vectorizes the first coefficient elimination loop, so
+// disable that optimization via pragma. Don't use the pragma under Clang, since
+// clang doesn't understand it.
+// TODO(wez): Remove this when crbug.com/439566 is fixed.
+#if defined(__GNUC__) && !defined(__clang__)
+#pragma GCC optimize("no-tree-vectorize")
+#endif
+
+void ReduceLarge(FieldElement* out, LargeFieldElement* inptr) {
+  LargeFieldElement& in(*inptr);
+
+  for (int i = 0; i < 8; i++) {
+    in[i] += kZero63ModP[i];
+  }
+
+  // Eliminate the coefficients at 2**224 and greater while maintaining the
+  // same value mod p.
+  for (int i = 14; i >= 8; i--) {
+    in[i-8] -= in[i];  // reflection off the "+1" term of p.
+    in[i-5] += (in[i] & 0xffff) << 12;  // part of the "-2**96" reflection.
+    in[i-4] += in[i] >> 16;  // the rest of the "-2**96" reflection.
+  }
+  in[8] = 0;
+  // in[0..8] < 2**64
+
+  // As the values become small enough, we start to store them in |out| and use
+  // 32-bit operations.
+  for (int i = 1; i < 8; i++) {
+    in[i+1] += in[i] >> 28;
+    (*out)[i] = static_cast<uint32>(in[i] & kBottom28Bits);
+  }
+  // Eliminate the term at 2*224 that we introduced while keeping the same
+  // value mod p.
+  in[0] -= in[8];  // reflection off the "+1" term of p.
+  (*out)[3] += static_cast<uint32>(in[8] & 0xffff) << 12;  // "-2**96" term
+  (*out)[4] += static_cast<uint32>(in[8] >> 16);  // rest of "-2**96" term
+  // in[0] < 2**64
+  // out[3] < 2**29
+  // out[4] < 2**29
+  // out[1,2,5..7] < 2**28
+
+  (*out)[0] = static_cast<uint32>(in[0] & kBottom28Bits);
+  (*out)[1] += static_cast<uint32>((in[0] >> 28) & kBottom28Bits);
+  (*out)[2] += static_cast<uint32>(in[0] >> 56);
+  // out[0] < 2**28
+  // out[1..4] < 2**29
+  // out[5..7] < 2**28
+}
+
+// TODO(wez): Remove this when crbug.com/439566 is fixed.
+#if defined(__GNUC__) && !defined(__clang__)
+// Reenable "tree-vectorize" optimization if it got disabled for ReduceLarge.
+#pragma GCC reset_options
+#endif
+
+// Mul computes *out = a*b
+//
+// a[i] < 2**29, b[i] < 2**30 (or vice versa)
+// out[i] < 2**29
+void Mul(FieldElement* out, const FieldElement& a, const FieldElement& b) {
+  LargeFieldElement tmp;
+  memset(&tmp, 0, sizeof(tmp));
+
+  for (int i = 0; i < 8; i++) {
+    for (int j = 0; j < 8; j++) {
+      tmp[i+j] += static_cast<uint64>(a[i]) * static_cast<uint64>(b[j]);
+    }
+  }
+
+  ReduceLarge(out, &tmp);
+}
+
+// Square computes *out = a*a
+//
+// a[i] < 2**29
+// out[i] < 2**29
+void Square(FieldElement* out, const FieldElement& a) {
+  LargeFieldElement tmp;
+  memset(&tmp, 0, sizeof(tmp));
+
+  for (int i = 0; i < 8; i++) {
+    for (int j = 0; j <= i; j++) {
+      uint64 r = static_cast<uint64>(a[i]) * static_cast<uint64>(a[j]);
+      if (i == j) {
+        tmp[i+j] += r;
+      } else {
+        tmp[i+j] += r << 1;
+      }
+    }
+  }
+
+  ReduceLarge(out, &tmp);
+}
+
+// Reduce reduces the coefficients of in_out to smaller bounds.
+//
+// On entry: a[i] < 2**31 + 2**30
+// On exit: a[i] < 2**29
+void Reduce(FieldElement* in_out) {
+  FieldElement& a = *in_out;
+
+  for (int i = 0; i < 7; i++) {
+    a[i+1] += a[i] >> 28;
+    a[i] &= kBottom28Bits;
+  }
+  uint32 top = a[7] >> 28;
+  a[7] &= kBottom28Bits;
+
+  // top < 2**4
+  // Constant-time: mask = (top != 0) ? 0xffffffff : 0
+  uint32 mask = top;
+  mask |= mask >> 2;
+  mask |= mask >> 1;
+  mask <<= 31;
+  mask = static_cast<uint32>(static_cast<int32>(mask) >> 31);
+
+  // Eliminate top while maintaining the same value mod p.
+  a[0] -= top;
+  a[3] += top << 12;
+
+  // We may have just made a[0] negative but, if we did, then we must
+  // have added something to a[3], thus it's > 2**12. Therefore we can
+  // carry down to a[0].
+  a[3] -= 1 & mask;
+  a[2] += mask & ((1<<28) - 1);
+  a[1] += mask & ((1<<28) - 1);
+  a[0] += mask & (1<<28);
+}
+
+// Invert calcuates *out = in**-1 by computing in**(2**224 - 2**96 - 1), i.e.
+// Fermat's little theorem.
+void Invert(FieldElement* out, const FieldElement& in) {
+  FieldElement f1, f2, f3, f4;
+
+  Square(&f1, in);                        // 2
+  Mul(&f1, f1, in);                       // 2**2 - 1
+  Square(&f1, f1);                        // 2**3 - 2
+  Mul(&f1, f1, in);                       // 2**3 - 1
+  Square(&f2, f1);                        // 2**4 - 2
+  Square(&f2, f2);                        // 2**5 - 4
+  Square(&f2, f2);                        // 2**6 - 8
+  Mul(&f1, f1, f2);                       // 2**6 - 1
+  Square(&f2, f1);                        // 2**7 - 2
+  for (int i = 0; i < 5; i++) {           // 2**12 - 2**6
+    Square(&f2, f2);
+  }
+  Mul(&f2, f2, f1);                       // 2**12 - 1
+  Square(&f3, f2);                        // 2**13 - 2
+  for (int i = 0; i < 11; i++) {          // 2**24 - 2**12
+    Square(&f3, f3);
+  }
+  Mul(&f2, f3, f2);                       // 2**24 - 1
+  Square(&f3, f2);                        // 2**25 - 2
+  for (int i = 0; i < 23; i++) {          // 2**48 - 2**24
+    Square(&f3, f3);
+  }
+  Mul(&f3, f3, f2);                       // 2**48 - 1
+  Square(&f4, f3);                        // 2**49 - 2
+  for (int i = 0; i < 47; i++) {          // 2**96 - 2**48
+    Square(&f4, f4);
+  }
+  Mul(&f3, f3, f4);                       // 2**96 - 1
+  Square(&f4, f3);                        // 2**97 - 2
+  for (int i = 0; i < 23; i++) {          // 2**120 - 2**24
+    Square(&f4, f4);
+  }
+  Mul(&f2, f4, f2);                       // 2**120 - 1
+  for (int i = 0; i < 6; i++) {           // 2**126 - 2**6
+    Square(&f2, f2);
+  }
+  Mul(&f1, f1, f2);                       // 2**126 - 1
+  Square(&f1, f1);                        // 2**127 - 2
+  Mul(&f1, f1, in);                       // 2**127 - 1
+  for (int i = 0; i < 97; i++) {          // 2**224 - 2**97
+    Square(&f1, f1);
+  }
+  Mul(out, f1, f3);                       // 2**224 - 2**96 - 1
+}
+
+// Contract converts a FieldElement to its minimal, distinguished form.
+//
+// On entry, in[i] < 2**29
+// On exit, in[i] < 2**28
+void Contract(FieldElement* inout) {
+  FieldElement& out = *inout;
+
+  // Reduce the coefficients to < 2**28.
+  for (int i = 0; i < 7; i++) {
+    out[i+1] += out[i] >> 28;
+    out[i] &= kBottom28Bits;
+  }
+  uint32 top = out[7] >> 28;
+  out[7] &= kBottom28Bits;
+
+  // Eliminate top while maintaining the same value mod p.
+  out[0] -= top;
+  out[3] += top << 12;
+
+  // We may just have made out[0] negative. So we carry down. If we made
+  // out[0] negative then we know that out[3] is sufficiently positive
+  // because we just added to it.
+  for (int i = 0; i < 3; i++) {
+    uint32 mask = static_cast<uint32>(static_cast<int32>(out[i]) >> 31);
+    out[i] += (1 << 28) & mask;
+    out[i+1] -= 1 & mask;
+  }
+
+  // We might have pushed out[3] over 2**28 so we perform another, partial
+  // carry chain.
+  for (int i = 3; i < 7; i++) {
+    out[i+1] += out[i] >> 28;
+    out[i] &= kBottom28Bits;
+  }
+  top = out[7] >> 28;
+  out[7] &= kBottom28Bits;
+
+  // Eliminate top while maintaining the same value mod p.
+  out[0] -= top;
+  out[3] += top << 12;
+
+  // There are two cases to consider for out[3]:
+  //   1) The first time that we eliminated top, we didn't push out[3] over
+  //      2**28. In this case, the partial carry chain didn't change any values
+  //      and top is zero.
+  //   2) We did push out[3] over 2**28 the first time that we eliminated top.
+  //      The first value of top was in [0..16), therefore, prior to eliminating
+  //      the first top, 0xfff1000 <= out[3] <= 0xfffffff. Therefore, after
+  //      overflowing and being reduced by the second carry chain, out[3] <=
+  //      0xf000. Thus it cannot have overflowed when we eliminated top for the
+  //      second time.
+
+  // Again, we may just have made out[0] negative, so do the same carry down.
+  // As before, if we made out[0] negative then we know that out[3] is
+  // sufficiently positive.
+  for (int i = 0; i < 3; i++) {
+    uint32 mask = static_cast<uint32>(static_cast<int32>(out[i]) >> 31);
+    out[i] += (1 << 28) & mask;
+    out[i+1] -= 1 & mask;
+  }
+
+  // The value is < 2**224, but maybe greater than p. In order to reduce to a
+  // unique, minimal value we see if the value is >= p and, if so, subtract p.
+
+  // First we build a mask from the top four limbs, which must all be
+  // equal to bottom28Bits if the whole value is >= p. If top_4_all_ones
+  // ends up with any zero bits in the bottom 28 bits, then this wasn't
+  // true.
+  uint32 top_4_all_ones = 0xffffffffu;
+  for (int i = 4; i < 8; i++) {
+    top_4_all_ones &= out[i];
+  }
+  top_4_all_ones |= 0xf0000000;
+  // Now we replicate any zero bits to all the bits in top_4_all_ones.
+  top_4_all_ones &= top_4_all_ones >> 16;
+  top_4_all_ones &= top_4_all_ones >> 8;
+  top_4_all_ones &= top_4_all_ones >> 4;
+  top_4_all_ones &= top_4_all_ones >> 2;
+  top_4_all_ones &= top_4_all_ones >> 1;
+  top_4_all_ones =
+      static_cast<uint32>(static_cast<int32>(top_4_all_ones << 31) >> 31);
+
+  // Now we test whether the bottom three limbs are non-zero.
+  uint32 bottom_3_non_zero = out[0] | out[1] | out[2];
+  bottom_3_non_zero |= bottom_3_non_zero >> 16;
+  bottom_3_non_zero |= bottom_3_non_zero >> 8;
+  bottom_3_non_zero |= bottom_3_non_zero >> 4;
+  bottom_3_non_zero |= bottom_3_non_zero >> 2;
+  bottom_3_non_zero |= bottom_3_non_zero >> 1;
+  bottom_3_non_zero =
+      static_cast<uint32>(static_cast<int32>(bottom_3_non_zero) >> 31);
+
+  // Everything depends on the value of out[3].
+  //    If it's > 0xffff000 and top_4_all_ones != 0 then the whole value is >= p
+  //    If it's = 0xffff000 and top_4_all_ones != 0 and bottom_3_non_zero != 0,
+  //      then the whole value is >= p
+  //    If it's < 0xffff000, then the whole value is < p
+  uint32 n = out[3] - 0xffff000;
+  uint32 out_3_equal = n;
+  out_3_equal |= out_3_equal >> 16;
+  out_3_equal |= out_3_equal >> 8;
+  out_3_equal |= out_3_equal >> 4;
+  out_3_equal |= out_3_equal >> 2;
+  out_3_equal |= out_3_equal >> 1;
+  out_3_equal =
+      ~static_cast<uint32>(static_cast<int32>(out_3_equal << 31) >> 31);
+
+  // If out[3] > 0xffff000 then n's MSB will be zero.
+  uint32 out_3_gt = ~static_cast<uint32>(static_cast<int32>(n << 31) >> 31);
+
+  uint32 mask = top_4_all_ones & ((out_3_equal & bottom_3_non_zero) | out_3_gt);
+  out[0] -= 1 & mask;
+  out[3] -= 0xffff000 & mask;
+  out[4] -= 0xfffffff & mask;
+  out[5] -= 0xfffffff & mask;
+  out[6] -= 0xfffffff & mask;
+  out[7] -= 0xfffffff & mask;
+}
+
+
+// Group element functions.
+//
+// These functions deal with group elements. The group is an elliptic curve
+// group with a = -3 defined in FIPS 186-3, section D.2.2.
+
+using crypto::p224::Point;
+
+// kB is parameter of the elliptic curve.
+const FieldElement kB = {
+  55967668, 11768882, 265861671, 185302395,
+  39211076, 180311059, 84673715, 188764328,
+};
+
+void CopyConditional(Point* out, const Point& a, uint32 mask);
+void DoubleJacobian(Point* out, const Point& a);
+
+// AddJacobian computes *out = a+b where a != b.
+void AddJacobian(Point *out,
+                 const Point& a,
+                 const Point& b) {
+  // See http://hyperelliptic.org/EFD/g1p/auto-shortw-jacobian-3.html#addition-add-2007-bl
+  FieldElement z1z1, z2z2, u1, u2, s1, s2, h, i, j, r, v;
+
+  uint32 z1_is_zero = IsZero(a.z);
+  uint32 z2_is_zero = IsZero(b.z);
+
+  // Z1Z1 = Z1²
+  Square(&z1z1, a.z);
+
+  // Z2Z2 = Z2²
+  Square(&z2z2, b.z);
+
+  // U1 = X1*Z2Z2
+  Mul(&u1, a.x, z2z2);
+
+  // U2 = X2*Z1Z1
+  Mul(&u2, b.x, z1z1);
+
+  // S1 = Y1*Z2*Z2Z2
+  Mul(&s1, b.z, z2z2);
+  Mul(&s1, a.y, s1);
+
+  // S2 = Y2*Z1*Z1Z1
+  Mul(&s2, a.z, z1z1);
+  Mul(&s2, b.y, s2);
+
+  // H = U2-U1
+  Subtract(&h, u2, u1);
+  Reduce(&h);
+  uint32 x_equal = IsZero(h);
+
+  // I = (2*H)²
+  for (int k = 0; k < 8; k++) {
+    i[k] = h[k] << 1;
+  }
+  Reduce(&i);
+  Square(&i, i);
+
+  // J = H*I
+  Mul(&j, h, i);
+  // r = 2*(S2-S1)
+  Subtract(&r, s2, s1);
+  Reduce(&r);
+  uint32 y_equal = IsZero(r);
+
+  if (x_equal && y_equal && !z1_is_zero && !z2_is_zero) {
+    // The two input points are the same therefore we must use the dedicated
+    // doubling function as the slope of the line is undefined.
+    DoubleJacobian(out, a);
+    return;
+  }
+
+  for (int k = 0; k < 8; k++) {
+    r[k] <<= 1;
+  }
+  Reduce(&r);
+
+  // V = U1*I
+  Mul(&v, u1, i);
+
+  // Z3 = ((Z1+Z2)²-Z1Z1-Z2Z2)*H
+  Add(&z1z1, z1z1, z2z2);
+  Add(&z2z2, a.z, b.z);
+  Reduce(&z2z2);
+  Square(&z2z2, z2z2);
+  Subtract(&out->z, z2z2, z1z1);
+  Reduce(&out->z);
+  Mul(&out->z, out->z, h);
+
+  // X3 = r²-J-2*V
+  for (int k = 0; k < 8; k++) {
+    z1z1[k] = v[k] << 1;
+  }
+  Add(&z1z1, j, z1z1);
+  Reduce(&z1z1);
+  Square(&out->x, r);
+  Subtract(&out->x, out->x, z1z1);
+  Reduce(&out->x);
+
+  // Y3 = r*(V-X3)-2*S1*J
+  for (int k = 0; k < 8; k++) {
+    s1[k] <<= 1;
+  }
+  Mul(&s1, s1, j);
+  Subtract(&z1z1, v, out->x);
+  Reduce(&z1z1);
+  Mul(&z1z1, z1z1, r);
+  Subtract(&out->y, z1z1, s1);
+  Reduce(&out->y);
+
+  CopyConditional(out, a, z2_is_zero);
+  CopyConditional(out, b, z1_is_zero);
+}
+
+// DoubleJacobian computes *out = a+a.
+void DoubleJacobian(Point* out, const Point& a) {
+  // See http://hyperelliptic.org/EFD/g1p/auto-shortw-jacobian-3.html#doubling-dbl-2001-b
+  FieldElement delta, gamma, beta, alpha, t;
+
+  Square(&delta, a.z);
+  Square(&gamma, a.y);
+  Mul(&beta, a.x, gamma);
+
+  // alpha = 3*(X1-delta)*(X1+delta)
+  Add(&t, a.x, delta);
+  for (int i = 0; i < 8; i++) {
+          t[i] += t[i] << 1;
+  }
+  Reduce(&t);
+  Subtract(&alpha, a.x, delta);
+  Reduce(&alpha);
+  Mul(&alpha, alpha, t);
+
+  // Z3 = (Y1+Z1)²-gamma-delta
+  Add(&out->z, a.y, a.z);
+  Reduce(&out->z);
+  Square(&out->z, out->z);
+  Subtract(&out->z, out->z, gamma);
+  Reduce(&out->z);
+  Subtract(&out->z, out->z, delta);
+  Reduce(&out->z);
+
+  // X3 = alpha²-8*beta
+  for (int i = 0; i < 8; i++) {
+          delta[i] = beta[i] << 3;
+  }
+  Reduce(&delta);
+  Square(&out->x, alpha);
+  Subtract(&out->x, out->x, delta);
+  Reduce(&out->x);
+
+  // Y3 = alpha*(4*beta-X3)-8*gamma²
+  for (int i = 0; i < 8; i++) {
+          beta[i] <<= 2;
+  }
+  Reduce(&beta);
+  Subtract(&beta, beta, out->x);
+  Reduce(&beta);
+  Square(&gamma, gamma);
+  for (int i = 0; i < 8; i++) {
+          gamma[i] <<= 3;
+  }
+  Reduce(&gamma);
+  Mul(&out->y, alpha, beta);
+  Subtract(&out->y, out->y, gamma);
+  Reduce(&out->y);
+}
+
+// CopyConditional sets *out=a if mask is 0xffffffff. mask must be either 0 of
+// 0xffffffff.
+void CopyConditional(Point* out,
+                     const Point& a,
+                     uint32 mask) {
+  for (int i = 0; i < 8; i++) {
+    out->x[i] ^= mask & (a.x[i] ^ out->x[i]);
+    out->y[i] ^= mask & (a.y[i] ^ out->y[i]);
+    out->z[i] ^= mask & (a.z[i] ^ out->z[i]);
+  }
+}
+
+// ScalarMult calculates *out = a*scalar where scalar is a big-endian number of
+// length scalar_len and != 0.
+void ScalarMult(Point* out, const Point& a,
+                const uint8* scalar, size_t scalar_len) {
+  memset(out, 0, sizeof(*out));
+  Point tmp;
+
+  for (size_t i = 0; i < scalar_len; i++) {
+    for (unsigned int bit_num = 0; bit_num < 8; bit_num++) {
+      DoubleJacobian(out, *out);
+      uint32 bit = static_cast<uint32>(static_cast<int32>(
+          (((scalar[i] >> (7 - bit_num)) & 1) << 31) >> 31));
+      AddJacobian(&tmp, a, *out);
+      CopyConditional(out, tmp, bit);
+    }
+  }
+}
+
+// Get224Bits reads 7 words from in and scatters their contents in
+// little-endian form into 8 words at out, 28 bits per output word.
+void Get224Bits(uint32* out, const uint32* in) {
+  out[0] = NetToHost32(in[6]) & kBottom28Bits;
+  out[1] = ((NetToHost32(in[5]) << 4) |
+            (NetToHost32(in[6]) >> 28)) & kBottom28Bits;
+  out[2] = ((NetToHost32(in[4]) << 8) |
+            (NetToHost32(in[5]) >> 24)) & kBottom28Bits;
+  out[3] = ((NetToHost32(in[3]) << 12) |
+            (NetToHost32(in[4]) >> 20)) & kBottom28Bits;
+  out[4] = ((NetToHost32(in[2]) << 16) |
+            (NetToHost32(in[3]) >> 16)) & kBottom28Bits;
+  out[5] = ((NetToHost32(in[1]) << 20) |
+            (NetToHost32(in[2]) >> 12)) & kBottom28Bits;
+  out[6] = ((NetToHost32(in[0]) << 24) |
+            (NetToHost32(in[1]) >> 8)) & kBottom28Bits;
+  out[7] = (NetToHost32(in[0]) >> 4) & kBottom28Bits;
+}
+
+// Put224Bits performs the inverse operation to Get224Bits: taking 28 bits from
+// each of 8 input words and writing them in big-endian order to 7 words at
+// out.
+void Put224Bits(uint32* out, const uint32* in) {
+  out[6] = HostToNet32((in[0] >> 0) | (in[1] << 28));
+  out[5] = HostToNet32((in[1] >> 4) | (in[2] << 24));
+  out[4] = HostToNet32((in[2] >> 8) | (in[3] << 20));
+  out[3] = HostToNet32((in[3] >> 12) | (in[4] << 16));
+  out[2] = HostToNet32((in[4] >> 16) | (in[5] << 12));
+  out[1] = HostToNet32((in[5] >> 20) | (in[6] << 8));
+  out[0] = HostToNet32((in[6] >> 24) | (in[7] << 4));
+}
+
+}  // anonymous namespace
+
+namespace crypto {
+
+namespace p224 {
+
+bool Point::SetFromString(const base::StringPiece& in) {
+  if (in.size() != 2*28)
+    return false;
+  const uint32* inwords = reinterpret_cast<const uint32*>(in.data());
+  Get224Bits(x, inwords);
+  Get224Bits(y, inwords + 7);
+  memset(&z, 0, sizeof(z));
+  z[0] = 1;
+
+  // Check that the point is on the curve, i.e. that y² = x³ - 3x + b.
+  FieldElement lhs;
+  Square(&lhs, y);
+  Contract(&lhs);
+
+  FieldElement rhs;
+  Square(&rhs, x);
+  Mul(&rhs, x, rhs);
+
+  FieldElement three_x;
+  for (int i = 0; i < 8; i++) {
+    three_x[i] = x[i] * 3;
+  }
+  Reduce(&three_x);
+  Subtract(&rhs, rhs, three_x);
+  Reduce(&rhs);
+
+  ::Add(&rhs, rhs, kB);
+  Contract(&rhs);
+  return memcmp(&lhs, &rhs, sizeof(lhs)) == 0;
+}
+
+std::string Point::ToString() const {
+  FieldElement zinv, zinv_sq, xx, yy;
+
+  // If this is the point at infinity we return a string of all zeros.
+  if (IsZero(this->z)) {
+    static const char zeros[56] = {0};
+    return std::string(zeros, sizeof(zeros));
+  }
+
+  Invert(&zinv, this->z);
+  Square(&zinv_sq, zinv);
+  Mul(&xx, x, zinv_sq);
+  Mul(&zinv_sq, zinv_sq, zinv);
+  Mul(&yy, y, zinv_sq);
+
+  Contract(&xx);
+  Contract(&yy);
+
+  uint32 outwords[14];
+  Put224Bits(outwords, xx);
+  Put224Bits(outwords + 7, yy);
+  return std::string(reinterpret_cast<const char*>(outwords), sizeof(outwords));
+}
+
+void ScalarMult(const Point& in, const uint8* scalar, Point* out) {
+  ::ScalarMult(out, in, scalar, 28);
+}
+
+// kBasePoint is the base point (generator) of the elliptic curve group.
+static const Point kBasePoint = {
+  {22813985, 52956513, 34677300, 203240812,
+   12143107, 133374265, 225162431, 191946955},
+  {83918388, 223877528, 122119236, 123340192,
+   266784067, 263504429, 146143011, 198407736},
+  {1, 0, 0, 0, 0, 0, 0, 0},
+};
+
+void ScalarBaseMult(const uint8* scalar, Point* out) {
+  ::ScalarMult(out, kBasePoint, scalar, 28);
+}
+
+void Add(const Point& a, const Point& b, Point* out) {
+  AddJacobian(out, a, b);
+}
+
+void Negate(const Point& in, Point* out) {
+  // Guide to elliptic curve cryptography, page 89 suggests that (X : X+Y : Z)
+  // is the negative in Jacobian coordinates, but it doesn't actually appear to
+  // be true in testing so this performs the negation in affine coordinates.
+  FieldElement zinv, zinv_sq, y;
+  Invert(&zinv, in.z);
+  Square(&zinv_sq, zinv);
+  Mul(&out->x, in.x, zinv_sq);
+  Mul(&zinv_sq, zinv_sq, zinv);
+  Mul(&y, in.y, zinv_sq);
+
+  Subtract(&out->y, kP, y);
+  Reduce(&out->y);
+
+  memset(&out->z, 0, sizeof(out->z));
+  out->z[0] = 1;
+}
+
+}  // namespace p224
+
+}  // namespace crypto
diff --git a/libweave/external/crypto/p224.h b/libweave/external/crypto/p224.h
new file mode 100644
index 0000000..2efecfa
--- /dev/null
+++ b/libweave/external/crypto/p224.h
@@ -0,0 +1,60 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CRYPTO_P224_H_
+#define CRYPTO_P224_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/strings/string_piece.h"
+#include "crypto/crypto_export.h"
+
+namespace crypto {
+
+// P224 implements an elliptic curve group, commonly known as P224 and defined
+// in FIPS 186-3, section D.2.2.
+namespace p224 {
+
+// An element of the field (ℤ/pℤ) is represented with 8, 28-bit limbs in
+// little endian order.
+typedef uint32 FieldElement[8];
+
+struct CRYPTO_EXPORT Point {
+  // SetFromString the value of the point from the 56 byte, external
+  // representation. The external point representation is an (x, y) pair of a
+  // point on the curve. Each field element is represented as a big-endian
+  // number < p.
+  bool SetFromString(const base::StringPiece& in);
+
+  // ToString returns an external representation of the Point.
+  std::string ToString() const;
+
+  // An Point is represented in Jacobian form (x/z², y/z³).
+  FieldElement x, y, z;
+};
+
+// kScalarBytes is the number of bytes needed to represent an element of the
+// P224 field.
+static const size_t kScalarBytes = 28;
+
+// ScalarMult computes *out = in*scalar where scalar is a 28-byte, big-endian
+// number.
+void CRYPTO_EXPORT ScalarMult(const Point& in, const uint8* scalar, Point* out);
+
+// ScalarBaseMult computes *out = g*scalar where g is the base point of the
+// curve and scalar is a 28-byte, big-endian number.
+void CRYPTO_EXPORT ScalarBaseMult(const uint8* scalar, Point* out);
+
+// Add computes *out = a+b.
+void CRYPTO_EXPORT Add(const Point& a, const Point& b, Point* out);
+
+// Negate calculates out = -a;
+void CRYPTO_EXPORT Negate(const Point& a, Point* out);
+
+}  // namespace p224
+
+}  // namespace crypto
+
+#endif  // CRYPTO_P224_H_
diff --git a/libweave/external/crypto/p224_spake.cc b/libweave/external/crypto/p224_spake.cc
new file mode 100644
index 0000000..a6dec40
--- /dev/null
+++ b/libweave/external/crypto/p224_spake.cc
@@ -0,0 +1,268 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// This code implements SPAKE2, a variant of EKE:
+//  http://www.di.ens.fr/~pointche/pub.php?reference=AbPo04
+
+#include <crypto/p224_spake.h>
+
+#include <algorithm>
+
+#include <base/logging.h>
+#include <crypto/p224.h>
+#include <crypto/random.h>
+#include <crypto/secure_util.h>
+
+namespace {
+
+// The following two points (M and N in the protocol) are verifiable random
+// points on the curve and can be generated with the following code:
+
+// #include <stdint.h>
+// #include <stdio.h>
+// #include <string.h>
+//
+// #include <openssl/ec.h>
+// #include <openssl/obj_mac.h>
+// #include <openssl/sha.h>
+//
+// static const char kSeed1[] = "P224 point generation seed (M)";
+// static const char kSeed2[] = "P224 point generation seed (N)";
+//
+// void find_seed(const char* seed) {
+//   SHA256_CTX sha256;
+//   uint8_t digest[SHA256_DIGEST_LENGTH];
+//
+//   SHA256_Init(&sha256);
+//   SHA256_Update(&sha256, seed, strlen(seed));
+//   SHA256_Final(digest, &sha256);
+//
+//   BIGNUM x, y;
+//   EC_GROUP* p224 = EC_GROUP_new_by_curve_name(NID_secp224r1);
+//   EC_POINT* p = EC_POINT_new(p224);
+//
+//   for (unsigned i = 0;; i++) {
+//     BN_init(&x);
+//     BN_bin2bn(digest, 28, &x);
+//
+//     if (EC_POINT_set_compressed_coordinates_GFp(
+//             p224, p, &x, digest[28] & 1, NULL)) {
+//       BN_init(&y);
+//       EC_POINT_get_affine_coordinates_GFp(p224, p, &x, &y, NULL);
+//       char* x_str = BN_bn2hex(&x);
+//       char* y_str = BN_bn2hex(&y);
+//       printf("Found after %u iterations:\n%s\n%s\n", i, x_str, y_str);
+//       OPENSSL_free(x_str);
+//       OPENSSL_free(y_str);
+//       BN_free(&x);
+//       BN_free(&y);
+//       break;
+//     }
+//
+//     SHA256_Init(&sha256);
+//     SHA256_Update(&sha256, digest, sizeof(digest));
+//     SHA256_Final(digest, &sha256);
+//
+//     BN_free(&x);
+//   }
+//
+//   EC_POINT_free(p);
+//   EC_GROUP_free(p224);
+// }
+//
+// int main() {
+//   find_seed(kSeed1);
+//   find_seed(kSeed2);
+//   return 0;
+// }
+
+const crypto::p224::Point kM = {
+  {174237515, 77186811, 235213682, 33849492,
+   33188520, 48266885, 177021753, 81038478},
+  {104523827, 245682244, 266509668, 236196369,
+   28372046, 145351378, 198520366, 113345994},
+  {1, 0, 0, 0, 0, 0, 0, 0},
+};
+
+const crypto::p224::Point kN = {
+  {136176322, 263523628, 251628795, 229292285,
+   5034302, 185981975, 171998428, 11653062},
+  {197567436, 51226044, 60372156, 175772188,
+   42075930, 8083165, 160827401, 65097570},
+  {1, 0, 0, 0, 0, 0, 0, 0},
+};
+
+}  // anonymous namespace
+
+namespace crypto {
+
+P224EncryptedKeyExchange::P224EncryptedKeyExchange(
+    PeerType peer_type, const base::StringPiece& password)
+    : state_(kStateInitial),
+      is_server_(peer_type == kPeerTypeServer) {
+  memset(&x_, 0, sizeof(x_));
+  memset(&expected_authenticator_, 0, sizeof(expected_authenticator_));
+
+  // x_ is a random scalar.
+  RandBytes(x_, sizeof(x_));
+
+  // Calculate |password| hash to get SPAKE password value.
+  SHA256HashString(std::string(password.data(), password.length()),
+                   pw_, sizeof(pw_));
+
+  Init();
+}
+
+void P224EncryptedKeyExchange::Init() {
+  // X = g**x_
+  p224::Point X;
+  p224::ScalarBaseMult(x_, &X);
+
+  // The client masks the Diffie-Hellman value, X, by adding M**pw and the
+  // server uses N**pw.
+  p224::Point MNpw;
+  p224::ScalarMult(is_server_ ? kN : kM, pw_, &MNpw);
+
+  // X* = X + (N|M)**pw
+  p224::Point Xstar;
+  p224::Add(X, MNpw, &Xstar);
+
+  next_message_ = Xstar.ToString();
+}
+
+const std::string& P224EncryptedKeyExchange::GetNextMessage() {
+  if (state_ == kStateInitial) {
+    state_ = kStateRecvDH;
+    return next_message_;
+  } else if (state_ == kStateSendHash) {
+    state_ = kStateRecvHash;
+    return next_message_;
+  }
+
+  LOG(FATAL) << "P224EncryptedKeyExchange::GetNextMessage called in"
+                " bad state " << state_;
+  next_message_ = "";
+  return next_message_;
+}
+
+P224EncryptedKeyExchange::Result P224EncryptedKeyExchange::ProcessMessage(
+    const base::StringPiece& message) {
+  if (state_ == kStateRecvHash) {
+    // This is the final state of the protocol: we are reading the peer's
+    // authentication hash and checking that it matches the one that we expect.
+    if (message.size() != sizeof(expected_authenticator_)) {
+      error_ = "peer's hash had an incorrect size";
+      return kResultFailed;
+    }
+    if (!SecureMemEqual(message.data(), expected_authenticator_,
+                        message.size())) {
+      error_ = "peer's hash had incorrect value";
+      return kResultFailed;
+    }
+    state_ = kStateDone;
+    return kResultSuccess;
+  }
+
+  if (state_ != kStateRecvDH) {
+    LOG(FATAL) << "P224EncryptedKeyExchange::ProcessMessage called in"
+                  " bad state " << state_;
+    error_ = "internal error";
+    return kResultFailed;
+  }
+
+  // Y* is the other party's masked, Diffie-Hellman value.
+  p224::Point Ystar;
+  if (!Ystar.SetFromString(message)) {
+    error_ = "failed to parse peer's masked Diffie-Hellman value";
+    return kResultFailed;
+  }
+
+  // We calculate the mask value: (N|M)**pw
+  p224::Point MNpw, minus_MNpw, Y, k;
+  p224::ScalarMult(is_server_ ? kM : kN, pw_, &MNpw);
+  p224::Negate(MNpw, &minus_MNpw);
+
+  // Y = Y* - (N|M)**pw
+  p224::Add(Ystar, minus_MNpw, &Y);
+
+  // K = Y**x_
+  p224::ScalarMult(Y, x_, &k);
+
+  // If everything worked out, then K is the same for both parties.
+  key_ = k.ToString();
+
+  std::string client_masked_dh, server_masked_dh;
+  if (is_server_) {
+    client_masked_dh = message.as_string();
+    server_masked_dh = next_message_;
+  } else {
+    client_masked_dh = next_message_;
+    server_masked_dh = message.as_string();
+  }
+
+  // Now we calculate the hashes that each side will use to prove to the other
+  // that they derived the correct value for K.
+  uint8 client_hash[kSHA256Length], server_hash[kSHA256Length];
+  CalculateHash(kPeerTypeClient, client_masked_dh, server_masked_dh, key_,
+                client_hash);
+  CalculateHash(kPeerTypeServer, client_masked_dh, server_masked_dh, key_,
+                server_hash);
+
+  const uint8* my_hash = is_server_ ? server_hash : client_hash;
+  const uint8* their_hash = is_server_ ? client_hash : server_hash;
+
+  next_message_ =
+      std::string(reinterpret_cast<const char*>(my_hash), kSHA256Length);
+  memcpy(expected_authenticator_, their_hash, kSHA256Length);
+  state_ = kStateSendHash;
+  return kResultPending;
+}
+
+void P224EncryptedKeyExchange::CalculateHash(
+    PeerType peer_type,
+    const std::string& client_masked_dh,
+    const std::string& server_masked_dh,
+    const std::string& k,
+    uint8* out_digest) {
+  std::string hash_contents;
+
+  if (peer_type == kPeerTypeServer) {
+    hash_contents = "server";
+  } else {
+    hash_contents = "client";
+  }
+
+  hash_contents += client_masked_dh;
+  hash_contents += server_masked_dh;
+  hash_contents +=
+      std::string(reinterpret_cast<const char *>(pw_), sizeof(pw_));
+  hash_contents += k;
+
+  SHA256HashString(hash_contents, out_digest, kSHA256Length);
+}
+
+const std::string& P224EncryptedKeyExchange::error() const {
+  return error_;
+}
+
+const std::string& P224EncryptedKeyExchange::GetKey() const {
+  DCHECK_EQ(state_, kStateDone);
+  return GetUnverifiedKey();
+}
+
+const std::string& P224EncryptedKeyExchange::GetUnverifiedKey() const {
+  // Key is already final when state is kStateSendHash. Subsequent states are
+  // used only for verification of the key. Some users may combine verification
+  // with sending verifiable data instead of |expected_authenticator_|.
+  DCHECK_GE(state_, kStateSendHash);
+  return key_;
+}
+
+void P224EncryptedKeyExchange::SetXForTesting(const std::string& x) {
+  memset(&x_, 0, sizeof(x_));
+  memcpy(&x_, x.data(), std::min(x.size(), sizeof(x_)));
+  Init();
+}
+
+}  // namespace crypto
diff --git a/libweave/external/crypto/p224_spake.h b/libweave/external/crypto/p224_spake.h
new file mode 100644
index 0000000..556b15c
--- /dev/null
+++ b/libweave/external/crypto/p224_spake.h
@@ -0,0 +1,126 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CRYPTO_P224_SPAKE_H_
+#define CRYPTO_P224_SPAKE_H_
+
+#include <base/gtest_prod_util.h>
+#include <base/strings/string_piece.h>
+#include <crypto/p224.h>
+#include <crypto/sha2.h>
+
+namespace crypto {
+
+// P224EncryptedKeyExchange implements SPAKE2, a variant of Encrypted
+// Key Exchange. It allows two parties that have a secret common
+// password to establish a common secure key by exchanging messages
+// over an insecure channel without disclosing the password.
+//
+// The password can be low entropy as authenticating with an attacker only
+// gives the attacker a one-shot password oracle. No other information about
+// the password is leaked. (However, you must be sure to limit the number of
+// permitted authentication attempts otherwise they get many one-shot oracles.)
+//
+// The protocol requires several RTTs (actually two, but you shouldn't assume
+// that.) To use the object, call GetNextMessage() and pass that message to the
+// peer. Get a message from the peer and feed it into ProcessMessage. Then
+// examine the return value of ProcessMessage:
+//   kResultPending: Another round is required. Call GetNextMessage and repeat.
+//   kResultFailed: The authentication has failed. You can get a human readable
+//       error message by calling error().
+//   kResultSuccess: The authentication was successful.
+//
+// In each exchange, each peer always sends a message.
+class CRYPTO_EXPORT P224EncryptedKeyExchange {
+ public:
+  enum Result {
+    kResultPending,
+    kResultFailed,
+    kResultSuccess,
+  };
+
+  // PeerType's values are named client and server due to convention. But
+  // they could be called "A" and "B" as far as the protocol is concerned so
+  // long as the two parties don't both get the same label.
+  enum PeerType {
+    kPeerTypeClient,
+    kPeerTypeServer,
+  };
+
+  // peer_type: the type of the local authentication party.
+  // password: secret session password. Both parties to the
+  //     authentication must pass the same value. For the case of a
+  //     TLS connection, see RFC 5705.
+  P224EncryptedKeyExchange(PeerType peer_type,
+                           const base::StringPiece& password);
+
+  // GetNextMessage returns a byte string which must be passed to the other
+  // party in the authentication.
+  const std::string& GetNextMessage();
+
+  // ProcessMessage processes a message which must have been generated by a
+  // call to GetNextMessage() by the other party.
+  Result ProcessMessage(const base::StringPiece& message);
+
+  // In the event that ProcessMessage() returns kResultFailed, error will
+  // return a human readable error message.
+  const std::string& error() const;
+
+  // The key established as result of the key exchange. Must be called
+  // at then end after ProcessMessage() returns kResultSuccess.
+  const std::string& GetKey() const;
+
+  // The key established as result of the key exchange. Can be called after
+  // the first ProcessMessage()
+  const std::string& GetUnverifiedKey() const;
+
+ private:
+  // The authentication state machine is very simple and each party proceeds
+  // through each of these states, in order.
+  enum State {
+    kStateInitial,
+    kStateRecvDH,
+    kStateSendHash,
+    kStateRecvHash,
+    kStateDone,
+  };
+
+  FRIEND_TEST_ALL_PREFIXES(MutualAuth, ExpectedValues);
+
+  void Init();
+
+  // Sets internal random scalar. Should be used by tests only.
+  void SetXForTesting(const std::string& x);
+
+  State state_;
+  const bool is_server_;
+  // next_message_ contains a value for GetNextMessage() to return.
+  std::string next_message_;
+  std::string error_;
+
+  // CalculateHash computes the verification hash for the given peer and writes
+  // |kSHA256Length| bytes at |out_digest|.
+  void CalculateHash(
+      PeerType peer_type,
+      const std::string& client_masked_dh,
+      const std::string& server_masked_dh,
+      const std::string& k,
+      uint8* out_digest);
+
+  // x_ is the secret Diffie-Hellman exponent (see paper referenced in .cc
+  // file).
+  uint8 x_[p224::kScalarBytes];
+  // pw_ is SHA256(P(password), P(session))[:28] where P() prepends a uint32,
+  // big-endian length prefix (see paper referenced in .cc file).
+  uint8 pw_[p224::kScalarBytes];
+  // expected_authenticator_ is used to store the hash value expected from the
+  // other party.
+  uint8 expected_authenticator_[kSHA256Length];
+
+  std::string key_;
+};
+
+}  // namespace crypto
+
+#endif  // CRYPTO_P224_SPAKE_H_
diff --git a/libweave/external/crypto/p224_spake_unittest.cc b/libweave/external/crypto/p224_spake_unittest.cc
new file mode 100644
index 0000000..15b5be2
--- /dev/null
+++ b/libweave/external/crypto/p224_spake_unittest.cc
@@ -0,0 +1,174 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "crypto/p224_spake.h"
+
+#include <string>
+
+#include "base/logging.h"
+#include "base/strings/string_number_conversions.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace crypto {
+
+namespace {
+
+std::string HexEncodeString(const std::string& binary_data) {
+  return base::HexEncode(binary_data.c_str(), binary_data.size());
+}
+
+bool RunExchange(P224EncryptedKeyExchange* client,
+                 P224EncryptedKeyExchange* server,
+                 bool is_password_same) {
+  for (;;) {
+    std::string client_message, server_message;
+    client_message = client->GetNextMessage();
+    server_message = server->GetNextMessage();
+
+    P224EncryptedKeyExchange::Result client_result, server_result;
+    client_result = client->ProcessMessage(server_message);
+    server_result = server->ProcessMessage(client_message);
+
+    // Check that we never hit the case where only one succeeds.
+    EXPECT_EQ(client_result == P224EncryptedKeyExchange::kResultSuccess,
+              server_result == P224EncryptedKeyExchange::kResultSuccess);
+
+    if (client_result == P224EncryptedKeyExchange::kResultFailed ||
+        server_result == P224EncryptedKeyExchange::kResultFailed) {
+      return false;
+    }
+
+    EXPECT_EQ(is_password_same,
+              client->GetUnverifiedKey() == server->GetUnverifiedKey());
+
+    if (client_result == P224EncryptedKeyExchange::kResultSuccess &&
+        server_result == P224EncryptedKeyExchange::kResultSuccess) {
+      return true;
+    }
+
+    EXPECT_EQ(P224EncryptedKeyExchange::kResultPending, client_result);
+    EXPECT_EQ(P224EncryptedKeyExchange::kResultPending, server_result);
+  }
+}
+
+const char kPassword[] = "foo";
+
+}  // namespace
+
+TEST(MutualAuth, CorrectAuth) {
+  P224EncryptedKeyExchange client(
+      P224EncryptedKeyExchange::kPeerTypeClient, kPassword);
+  P224EncryptedKeyExchange server(
+      P224EncryptedKeyExchange::kPeerTypeServer, kPassword);
+
+  EXPECT_TRUE(RunExchange(&client, &server, true));
+  EXPECT_EQ(client.GetKey(), server.GetKey());
+}
+
+TEST(MutualAuth, IncorrectPassword) {
+  P224EncryptedKeyExchange client(
+      P224EncryptedKeyExchange::kPeerTypeClient,
+      kPassword);
+  P224EncryptedKeyExchange server(
+      P224EncryptedKeyExchange::kPeerTypeServer,
+      "wrongpassword");
+
+  EXPECT_FALSE(RunExchange(&client, &server, false));
+}
+
+TEST(MutualAuth, ExpectedValues) {
+  P224EncryptedKeyExchange client(P224EncryptedKeyExchange::kPeerTypeClient,
+                                  kPassword);
+  client.SetXForTesting("Client x");
+  P224EncryptedKeyExchange server(P224EncryptedKeyExchange::kPeerTypeServer,
+                                  kPassword);
+  server.SetXForTesting("Server x");
+
+  std::string client_message = client.GetNextMessage();
+  EXPECT_EQ(
+      "3508EF7DECC8AB9F9C439FBB0154288BBECC0A82E8448F4CF29554EB"
+      "BE9D486686226255EAD1D077C635B1A41F46AC91D7F7F32CED9EC3E0",
+      HexEncodeString(client_message));
+
+  std::string server_message = server.GetNextMessage();
+  EXPECT_EQ(
+      "A3088C18B75D2C2B107105661AEC85424777475EB29F1DDFB8C14AFB"
+      "F1603D0DF38413A00F420ACF2059E7997C935F5A957A193D09A2B584",
+      HexEncodeString(server_message));
+
+  EXPECT_EQ(P224EncryptedKeyExchange::kResultPending,
+            client.ProcessMessage(server_message));
+  EXPECT_EQ(P224EncryptedKeyExchange::kResultPending,
+            server.ProcessMessage(client_message));
+
+  EXPECT_EQ(client.GetUnverifiedKey(), server.GetUnverifiedKey());
+  // Must stay the same. External implementations should be able to pair with.
+  EXPECT_EQ(
+      "CE7CCFC435CDA4F01EC8826788B1F8B82EF7D550A34696B371096E64"
+      "C487D4FE193F7D1A6FF6820BC7F807796BA3889E8F999BBDEFC32FFA",
+      HexEncodeString(server.GetUnverifiedKey()));
+
+  EXPECT_TRUE(RunExchange(&client, &server, true));
+  EXPECT_EQ(client.GetKey(), server.GetKey());
+}
+
+TEST(MutualAuth, Fuzz) {
+  static const unsigned kIterations = 40;
+
+  for (unsigned i = 0; i < kIterations; i++) {
+    P224EncryptedKeyExchange client(
+        P224EncryptedKeyExchange::kPeerTypeClient, kPassword);
+    P224EncryptedKeyExchange server(
+        P224EncryptedKeyExchange::kPeerTypeServer, kPassword);
+
+    // We'll only be testing small values of i, but we don't want that to bias
+    // the test coverage. So we disperse the value of i by multiplying by the
+    // FNV, 32-bit prime, producing a poor-man's PRNG.
+    const uint32 rand = i * 16777619;
+
+    for (unsigned round = 0;; round++) {
+      std::string client_message, server_message;
+      client_message = client.GetNextMessage();
+      server_message = server.GetNextMessage();
+
+      if ((rand & 1) == round) {
+        const bool server_or_client = rand & 2;
+        std::string* m = server_or_client ? &server_message : &client_message;
+        if (rand & 4) {
+          // Truncate
+          *m = m->substr(0, (i >> 3) % m->size());
+        } else {
+          // Corrupt
+          const size_t bits = m->size() * 8;
+          const size_t bit_to_corrupt = (rand >> 3) % bits;
+          const_cast<char*>(m->data())[bit_to_corrupt / 8] ^=
+              1 << (bit_to_corrupt % 8);
+        }
+      }
+
+      P224EncryptedKeyExchange::Result client_result, server_result;
+      client_result = client.ProcessMessage(server_message);
+      server_result = server.ProcessMessage(client_message);
+
+      // If we have corrupted anything, we expect the authentication to fail,
+      // although one side can succeed if we happen to corrupt the second round
+      // message to the other.
+      ASSERT_FALSE(
+          client_result == P224EncryptedKeyExchange::kResultSuccess &&
+          server_result == P224EncryptedKeyExchange::kResultSuccess);
+
+      if (client_result == P224EncryptedKeyExchange::kResultFailed ||
+          server_result == P224EncryptedKeyExchange::kResultFailed) {
+        break;
+      }
+
+      ASSERT_EQ(P224EncryptedKeyExchange::kResultPending,
+                client_result);
+      ASSERT_EQ(P224EncryptedKeyExchange::kResultPending,
+                server_result);
+    }
+  }
+}
+
+}  // namespace crypto
diff --git a/libweave/external/crypto/p224_unittest.cc b/libweave/external/crypto/p224_unittest.cc
new file mode 100644
index 0000000..aaf5f59
--- /dev/null
+++ b/libweave/external/crypto/p224_unittest.cc
@@ -0,0 +1,824 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <string.h>
+#include <stdio.h>
+
+#include "crypto/p224.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace crypto {
+
+using p224::Point;
+
+// kBasePointExternal is the P224 base point in external representation.
+static const uint8 kBasePointExternal[56] = {
+  0xb7, 0x0e, 0x0c, 0xbd, 0x6b, 0xb4, 0xbf, 0x7f,
+  0x32, 0x13, 0x90, 0xb9, 0x4a, 0x03, 0xc1, 0xd3,
+  0x56, 0xc2, 0x11, 0x22, 0x34, 0x32, 0x80, 0xd6,
+  0x11, 0x5c, 0x1d, 0x21, 0xbd, 0x37, 0x63, 0x88,
+  0xb5, 0xf7, 0x23, 0xfb, 0x4c, 0x22, 0xdf, 0xe6,
+  0xcd, 0x43, 0x75, 0xa0, 0x5a, 0x07, 0x47, 0x64,
+  0x44, 0xd5, 0x81, 0x99, 0x85, 0x00, 0x7e, 0x34,
+};
+
+// TestVector represents a test of scalar multiplication of the base point.
+// |scalar| is a big-endian scalar and |affine| is the external representation
+// of g*scalar.
+struct TestVector {
+  uint8 scalar[28];
+  uint8 affine[28*2];
+};
+
+static const int kNumNISTTestVectors = 52;
+
+// kNISTTestVectors are the NIST test vectors for P224.
+static const TestVector kNISTTestVectors[kNumNISTTestVectors] = {
+  {
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x01},
+    {0xb7, 0x0e, 0x0c, 0xbd, 0x6b, 0xb4, 0xbf, 0x7f,
+     0x32, 0x13, 0x90, 0xb9, 0x4a, 0x03, 0xc1, 0xd3,
+     0x56, 0xc2, 0x11, 0x22, 0x34, 0x32, 0x80, 0xd6,
+     0x11, 0x5c, 0x1d, 0x21, 0xbd, 0x37, 0x63, 0x88,
+     0xb5, 0xf7, 0x23, 0xfb, 0x4c, 0x22, 0xdf, 0xe6,
+     0xcd, 0x43, 0x75, 0xa0, 0x5a, 0x07, 0x47, 0x64,
+     0x44, 0xd5, 0x81, 0x99, 0x85, 0x00, 0x7e, 0x34
+    },
+  },
+  {
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x02, },
+
+    {0x70, 0x6a, 0x46, 0xdc, 0x76, 0xdc, 0xb7, 0x67,
+     0x98, 0xe6, 0x0e, 0x6d, 0x89, 0x47, 0x47, 0x88,
+     0xd1, 0x6d, 0xc1, 0x80, 0x32, 0xd2, 0x68, 0xfd,
+     0x1a, 0x70, 0x4f, 0xa6, 0x1c, 0x2b, 0x76, 0xa7,
+     0xbc, 0x25, 0xe7, 0x70, 0x2a, 0x70, 0x4f, 0xa9,
+     0x86, 0x89, 0x28, 0x49, 0xfc, 0xa6, 0x29, 0x48,
+     0x7a, 0xcf, 0x37, 0x09, 0xd2, 0xe4, 0xe8, 0xbb,
+    },
+  },
+  {
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x03, },
+    {0xdf, 0x1b, 0x1d, 0x66, 0xa5, 0x51, 0xd0, 0xd3,
+     0x1e, 0xff, 0x82, 0x25, 0x58, 0xb9, 0xd2, 0xcc,
+     0x75, 0xc2, 0x18, 0x02, 0x79, 0xfe, 0x0d, 0x08,
+     0xfd, 0x89, 0x6d, 0x04, 0xa3, 0xf7, 0xf0, 0x3c,
+     0xad, 0xd0, 0xbe, 0x44, 0x4c, 0x0a, 0xa5, 0x68,
+     0x30, 0x13, 0x0d, 0xdf, 0x77, 0xd3, 0x17, 0x34,
+     0x4e, 0x1a, 0xf3, 0x59, 0x19, 0x81, 0xa9, 0x25,
+    },
+  },
+  {
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x04, },
+    {0xae, 0x99, 0xfe, 0xeb, 0xb5, 0xd2, 0x69, 0x45,
+     0xb5, 0x48, 0x92, 0x09, 0x2a, 0x8a, 0xee, 0x02,
+     0x91, 0x29, 0x30, 0xfa, 0x41, 0xcd, 0x11, 0x4e,
+     0x40, 0x44, 0x73, 0x01, 0x04, 0x82, 0x58, 0x0a,
+     0x0e, 0xc5, 0xbc, 0x47, 0xe8, 0x8b, 0xc8, 0xc3,
+     0x78, 0x63, 0x2c, 0xd1, 0x96, 0xcb, 0x3f, 0xa0,
+     0x58, 0xa7, 0x11, 0x4e, 0xb0, 0x30, 0x54, 0xc9,
+    },
+  },
+  {
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x05, },
+    {0x31, 0xc4, 0x9a, 0xe7, 0x5b, 0xce, 0x78, 0x07,
+     0xcd, 0xff, 0x22, 0x05, 0x5d, 0x94, 0xee, 0x90,
+     0x21, 0xfe, 0xdb, 0xb5, 0xab, 0x51, 0xc5, 0x75,
+     0x26, 0xf0, 0x11, 0xaa, 0x27, 0xe8, 0xbf, 0xf1,
+     0x74, 0x56, 0x35, 0xec, 0x5b, 0xa0, 0xc9, 0xf1,
+     0xc2, 0xed, 0xe1, 0x54, 0x14, 0xc6, 0x50, 0x7d,
+     0x29, 0xff, 0xe3, 0x7e, 0x79, 0x0a, 0x07, 0x9b,
+    },
+  },
+  {
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x06, },
+    {0x1f, 0x24, 0x83, 0xf8, 0x25, 0x72, 0x25, 0x1f,
+     0xca, 0x97, 0x5f, 0xea, 0x40, 0xdb, 0x82, 0x1d,
+     0xf8, 0xad, 0x82, 0xa3, 0xc0, 0x02, 0xee, 0x6c,
+     0x57, 0x11, 0x24, 0x08, 0x89, 0xfa, 0xf0, 0xcc,
+     0xb7, 0x50, 0xd9, 0x9b, 0x55, 0x3c, 0x57, 0x4f,
+     0xad, 0x7e, 0xcf, 0xb0, 0x43, 0x85, 0x86, 0xeb,
+     0x39, 0x52, 0xaf, 0x5b, 0x4b, 0x15, 0x3c, 0x7e,
+    },
+  },
+  {
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x07, },
+    {0xdb, 0x2f, 0x6b, 0xe6, 0x30, 0xe2, 0x46, 0xa5,
+     0xcf, 0x7d, 0x99, 0xb8, 0x51, 0x94, 0xb1, 0x23,
+     0xd4, 0x87, 0xe2, 0xd4, 0x66, 0xb9, 0x4b, 0x24,
+     0xa0, 0x3c, 0x3e, 0x28, 0x0f, 0x3a, 0x30, 0x08,
+     0x54, 0x97, 0xf2, 0xf6, 0x11, 0xee, 0x25, 0x17,
+     0xb1, 0x63, 0xef, 0x8c, 0x53, 0xb7, 0x15, 0xd1,
+     0x8b, 0xb4, 0xe4, 0x80, 0x8d, 0x02, 0xb9, 0x63,
+    },
+  },
+  {
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x08, },
+    {0x85, 0x8e, 0x6f, 0x9c, 0xc6, 0xc1, 0x2c, 0x31,
+     0xf5, 0xdf, 0x12, 0x4a, 0xa7, 0x77, 0x67, 0xb0,
+     0x5c, 0x8b, 0xc0, 0x21, 0xbd, 0x68, 0x3d, 0x2b,
+     0x55, 0x57, 0x15, 0x50, 0x04, 0x6d, 0xcd, 0x3e,
+     0xa5, 0xc4, 0x38, 0x98, 0xc5, 0xc5, 0xfc, 0x4f,
+     0xda, 0xc7, 0xdb, 0x39, 0xc2, 0xf0, 0x2e, 0xbe,
+     0xe4, 0xe3, 0x54, 0x1d, 0x1e, 0x78, 0x04, 0x7a,
+    },
+  },
+  {
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x09, },
+    {0x2f, 0xdc, 0xcc, 0xfe, 0xe7, 0x20, 0xa7, 0x7e,
+     0xf6, 0xcb, 0x3b, 0xfb, 0xb4, 0x47, 0xf9, 0x38,
+     0x31, 0x17, 0xe3, 0xda, 0xa4, 0xa0, 0x7e, 0x36,
+     0xed, 0x15, 0xf7, 0x8d, 0x37, 0x17, 0x32, 0xe4,
+     0xf4, 0x1b, 0xf4, 0xf7, 0x88, 0x30, 0x35, 0xe6,
+     0xa7, 0x9f, 0xce, 0xdc, 0x0e, 0x19, 0x6e, 0xb0,
+     0x7b, 0x48, 0x17, 0x16, 0x97, 0x51, 0x74, 0x63,
+    },
+  },
+  {
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x0a, },
+    {0xae, 0xa9, 0xe1, 0x7a, 0x30, 0x65, 0x17, 0xeb,
+     0x89, 0x15, 0x2a, 0xa7, 0x09, 0x6d, 0x2c, 0x38,
+     0x1e, 0xc8, 0x13, 0xc5, 0x1a, 0xa8, 0x80, 0xe7,
+     0xbe, 0xe2, 0xc0, 0xfd, 0x39, 0xbb, 0x30, 0xea,
+     0xb3, 0x37, 0xe0, 0xa5, 0x21, 0xb6, 0xcb, 0xa1,
+     0xab, 0xe4, 0xb2, 0xb3, 0xa3, 0xe5, 0x24, 0xc1,
+     0x4a, 0x3f, 0xe3, 0xeb, 0x11, 0x6b, 0x65, 0x5f,
+    },
+  },
+  {
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x0b, },
+    {0xef, 0x53, 0xb6, 0x29, 0x4a, 0xca, 0x43, 0x1f,
+     0x0f, 0x3c, 0x22, 0xdc, 0x82, 0xeb, 0x90, 0x50,
+     0x32, 0x4f, 0x1d, 0x88, 0xd3, 0x77, 0xe7, 0x16,
+     0x44, 0x8e, 0x50, 0x7c, 0x20, 0xb5, 0x10, 0x00,
+     0x40, 0x92, 0xe9, 0x66, 0x36, 0xcf, 0xb7, 0xe3,
+     0x2e, 0xfd, 0xed, 0x82, 0x65, 0xc2, 0x66, 0xdf,
+     0xb7, 0x54, 0xfa, 0x6d, 0x64, 0x91, 0xa6, 0xda,
+    },
+  },
+  {
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x0c, },
+    {0x6e, 0x31, 0xee, 0x1d, 0xc1, 0x37, 0xf8, 0x1b,
+     0x05, 0x67, 0x52, 0xe4, 0xde, 0xab, 0x14, 0x43,
+     0xa4, 0x81, 0x03, 0x3e, 0x9b, 0x4c, 0x93, 0xa3,
+     0x04, 0x4f, 0x4f, 0x7a, 0x20, 0x7d, 0xdd, 0xf0,
+     0x38, 0x5b, 0xfd, 0xea, 0xb6, 0xe9, 0xac, 0xda,
+     0x8d, 0xa0, 0x6b, 0x3b, 0xbe, 0xf2, 0x24, 0xa9,
+     0x3a, 0xb1, 0xe9, 0xe0, 0x36, 0x10, 0x9d, 0x13,
+    },
+  },
+  {
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x0d, },
+    {0x34, 0xe8, 0xe1, 0x7a, 0x43, 0x0e, 0x43, 0x28,
+     0x97, 0x93, 0xc3, 0x83, 0xfa, 0xc9, 0x77, 0x42,
+     0x47, 0xb4, 0x0e, 0x9e, 0xbd, 0x33, 0x66, 0x98,
+     0x1f, 0xcf, 0xae, 0xca, 0x25, 0x28, 0x19, 0xf7,
+     0x1c, 0x7f, 0xb7, 0xfb, 0xcb, 0x15, 0x9b, 0xe3,
+     0x37, 0xd3, 0x7d, 0x33, 0x36, 0xd7, 0xfe, 0xb9,
+     0x63, 0x72, 0x4f, 0xdf, 0xb0, 0xec, 0xb7, 0x67,
+    },
+  },
+  {
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x0e, },
+    {0xa5, 0x36, 0x40, 0xc8, 0x3d, 0xc2, 0x08, 0x60,
+     0x3d, 0xed, 0x83, 0xe4, 0xec, 0xf7, 0x58, 0xf2,
+     0x4c, 0x35, 0x7d, 0x7c, 0xf4, 0x80, 0x88, 0xb2,
+     0xce, 0x01, 0xe9, 0xfa, 0xd5, 0x81, 0x4c, 0xd7,
+     0x24, 0x19, 0x9c, 0x4a, 0x5b, 0x97, 0x4a, 0x43,
+     0x68, 0x5f, 0xbf, 0x5b, 0x8b, 0xac, 0x69, 0x45,
+     0x9c, 0x94, 0x69, 0xbc, 0x8f, 0x23, 0xcc, 0xaf,
+    },
+  },
+  {
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x0f, },
+    {0xba, 0xa4, 0xd8, 0x63, 0x55, 0x11, 0xa7, 0xd2,
+     0x88, 0xae, 0xbe, 0xed, 0xd1, 0x2c, 0xe5, 0x29,
+     0xff, 0x10, 0x2c, 0x91, 0xf9, 0x7f, 0x86, 0x7e,
+     0x21, 0x91, 0x6b, 0xf9, 0x97, 0x9a, 0x5f, 0x47,
+     0x59, 0xf8, 0x0f, 0x4f, 0xb4, 0xec, 0x2e, 0x34,
+     0xf5, 0x56, 0x6d, 0x59, 0x56, 0x80, 0xa1, 0x17,
+     0x35, 0xe7, 0xb6, 0x10, 0x46, 0x12, 0x79, 0x89,
+    },
+  },
+  {
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x10, },
+    {0x0b, 0x6e, 0xc4, 0xfe, 0x17, 0x77, 0x38, 0x24,
+     0x04, 0xef, 0x67, 0x99, 0x97, 0xba, 0x8d, 0x1c,
+     0xc5, 0xcd, 0x8e, 0x85, 0x34, 0x92, 0x59, 0xf5,
+     0x90, 0xc4, 0xc6, 0x6d, 0x33, 0x99, 0xd4, 0x64,
+     0x34, 0x59, 0x06, 0xb1, 0x1b, 0x00, 0xe3, 0x63,
+     0xef, 0x42, 0x92, 0x21, 0xf2, 0xec, 0x72, 0x0d,
+     0x2f, 0x66, 0x5d, 0x7d, 0xea, 0xd5, 0xb4, 0x82,
+    },
+  },
+  {
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x11, },
+    {0xb8, 0x35, 0x7c, 0x3a, 0x6c, 0xee, 0xf2, 0x88,
+     0x31, 0x0e, 0x17, 0xb8, 0xbf, 0xef, 0xf9, 0x20,
+     0x08, 0x46, 0xca, 0x8c, 0x19, 0x42, 0x49, 0x7c,
+     0x48, 0x44, 0x03, 0xbc, 0xff, 0x14, 0x9e, 0xfa,
+     0x66, 0x06, 0xa6, 0xbd, 0x20, 0xef, 0x7d, 0x1b,
+     0x06, 0xbd, 0x92, 0xf6, 0x90, 0x46, 0x39, 0xdc,
+     0xe5, 0x17, 0x4d, 0xb6, 0xcc, 0x55, 0x4a, 0x26,
+    },
+  },
+  {
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x12, },
+    {0xc9, 0xff, 0x61, 0xb0, 0x40, 0x87, 0x4c, 0x05,
+     0x68, 0x47, 0x92, 0x16, 0x82, 0x4a, 0x15, 0xea,
+     0xb1, 0xa8, 0x38, 0xa7, 0x97, 0xd1, 0x89, 0x74,
+     0x62, 0x26, 0xe4, 0xcc, 0xea, 0x98, 0xd6, 0x0e,
+     0x5f, 0xfc, 0x9b, 0x8f, 0xcf, 0x99, 0x9f, 0xab,
+     0x1d, 0xf7, 0xe7, 0xef, 0x70, 0x84, 0xf2, 0x0d,
+     0xdb, 0x61, 0xbb, 0x04, 0x5a, 0x6c, 0xe0, 0x02,
+    },
+  },
+  {
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x13, },
+    {0xa1, 0xe8, 0x1c, 0x04, 0xf3, 0x0c, 0xe2, 0x01,
+     0xc7, 0xc9, 0xac, 0xe7, 0x85, 0xed, 0x44, 0xcc,
+     0x33, 0xb4, 0x55, 0xa0, 0x22, 0xf2, 0xac, 0xdb,
+     0xc6, 0xca, 0xe8, 0x3c, 0xdc, 0xf1, 0xf6, 0xc3,
+     0xdb, 0x09, 0xc7, 0x0a, 0xcc, 0x25, 0x39, 0x1d,
+     0x49, 0x2f, 0xe2, 0x5b, 0x4a, 0x18, 0x0b, 0xab,
+     0xd6, 0xce, 0xa3, 0x56, 0xc0, 0x47, 0x19, 0xcd,
+    },
+  },
+  {
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x14, },
+    {0xfc, 0xc7, 0xf2, 0xb4, 0x5d, 0xf1, 0xcd, 0x5a,
+     0x3c, 0x0c, 0x07, 0x31, 0xca, 0x47, 0xa8, 0xaf,
+     0x75, 0xcf, 0xb0, 0x34, 0x7e, 0x83, 0x54, 0xee,
+     0xfe, 0x78, 0x24, 0x55, 0x0d, 0x5d, 0x71, 0x10,
+     0x27, 0x4c, 0xba, 0x7c, 0xde, 0xe9, 0x0e, 0x1a,
+     0x8b, 0x0d, 0x39, 0x4c, 0x37, 0x6a, 0x55, 0x73,
+     0xdb, 0x6b, 0xe0, 0xbf, 0x27, 0x47, 0xf5, 0x30,
+    },
+  },
+  {
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x01, 0x8e, 0xbb, 0xb9,
+     0x5e, 0xed, 0x0e, 0x13, },
+    {0x61, 0xf0, 0x77, 0xc6, 0xf6, 0x2e, 0xd8, 0x02,
+     0xda, 0xd7, 0xc2, 0xf3, 0x8f, 0x5c, 0x67, 0xf2,
+     0xcc, 0x45, 0x36, 0x01, 0xe6, 0x1b, 0xd0, 0x76,
+     0xbb, 0x46, 0x17, 0x9e, 0x22, 0x72, 0xf9, 0xe9,
+     0xf5, 0x93, 0x3e, 0x70, 0x38, 0x8e, 0xe6, 0x52,
+     0x51, 0x34, 0x43, 0xb5, 0xe2, 0x89, 0xdd, 0x13,
+     0x5d, 0xcc, 0x0d, 0x02, 0x99, 0xb2, 0x25, 0xe4,
+    },
+  },
+  {
+    {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x15, 0x9d, 0x89,
+     0x3d, 0x4c, 0xdd, 0x74, 0x72, 0x46, 0xcd, 0xca,
+     0x43, 0x59, 0x0e, 0x13, },
+    {0x02, 0x98, 0x95, 0xf0, 0xaf, 0x49, 0x6b, 0xfc,
+     0x62, 0xb6, 0xef, 0x8d, 0x8a, 0x65, 0xc8, 0x8c,
+     0x61, 0x39, 0x49, 0xb0, 0x36, 0x68, 0xaa, 0xb4,
+     0xf0, 0x42, 0x9e, 0x35, 0x3e, 0xa6, 0xe5, 0x3f,
+     0x9a, 0x84, 0x1f, 0x20, 0x19, 0xec, 0x24, 0xbd,
+     0xe1, 0xa7, 0x56, 0x77, 0xaa, 0x9b, 0x59, 0x02,
+     0xe6, 0x10, 0x81, 0xc0, 0x10, 0x64, 0xde, 0x93,
+    },
+  },
+  {
+    {0x41, 0xff, 0xc1, 0xff, 0xff, 0xfe, 0x01, 0xff,
+     0xfc, 0x00, 0x03, 0xff, 0xfe, 0x00, 0x07, 0xc0,
+     0x01, 0xff, 0xf0, 0x00, 0x03, 0xff, 0xf0, 0x7f,
+     0xfe, 0x00, 0x07, 0xc0, },
+    {0xab, 0x68, 0x99, 0x30, 0xbc, 0xae, 0x4a, 0x4a,
+     0xa5, 0xf5, 0xcb, 0x08, 0x5e, 0x82, 0x3e, 0x8a,
+     0xe3, 0x0f, 0xd3, 0x65, 0xeb, 0x1d, 0xa4, 0xab,
+     0xa9, 0xcf, 0x03, 0x79, 0x33, 0x45, 0xa1, 0x21,
+     0xbb, 0xd2, 0x33, 0x54, 0x8a, 0xf0, 0xd2, 0x10,
+     0x65, 0x4e, 0xb4, 0x0b, 0xab, 0x78, 0x8a, 0x03,
+     0x66, 0x64, 0x19, 0xbe, 0x6f, 0xbd, 0x34, 0xe7,
+    },
+  },
+  {
+    {0x7f, 0xff, 0xff, 0xc0, 0x3f, 0xff, 0xc0, 0x03,
+     0xff, 0xff, 0xfc, 0x00, 0x7f, 0xff, 0x00, 0x00,
+     0x00, 0x00, 0x07, 0x00, 0x00, 0x10, 0x00, 0x00,
+     0x00, 0x0e, 0x00, 0xff, },
+    {0xbd, 0xb6, 0xa8, 0x81, 0x7c, 0x1f, 0x89, 0xda,
+     0x1c, 0x2f, 0x3d, 0xd8, 0xe9, 0x7f, 0xeb, 0x44,
+     0x94, 0xf2, 0xed, 0x30, 0x2a, 0x4c, 0xe2, 0xbc,
+     0x7f, 0x5f, 0x40, 0x25, 0x4c, 0x70, 0x20, 0xd5,
+     0x7c, 0x00, 0x41, 0x18, 0x89, 0x46, 0x2d, 0x77,
+     0xa5, 0x43, 0x8b, 0xb4, 0xe9, 0x7d, 0x17, 0x77,
+     0x00, 0xbf, 0x72, 0x43, 0xa0, 0x7f, 0x16, 0x80,
+    },
+  },
+  {
+    {0x7f, 0xff, 0xff, 0x04, 0x00, 0x00, 0x00, 0x00,
+     0xff, 0xff, 0xf0, 0x1f, 0xff, 0xf8, 0xff, 0xff,
+     0xc0, 0x0f, 0xff, 0xff, 0xff, 0xff, 0xc0, 0x00,
+     0x00, 0x0f, 0xff, 0xff, },
+    {0xd5, 0x8b, 0x61, 0xaa, 0x41, 0xc3, 0x2d, 0xd5,
+     0xeb, 0xa4, 0x62, 0x64, 0x7d, 0xba, 0x75, 0xc5,
+     0xd6, 0x7c, 0x83, 0x60, 0x6c, 0x0a, 0xf2, 0xbd,
+     0x92, 0x84, 0x46, 0xa9, 0xd2, 0x4b, 0xa6, 0xa8,
+     0x37, 0xbe, 0x04, 0x60, 0xdd, 0x10, 0x7a, 0xe7,
+     0x77, 0x25, 0x69, 0x6d, 0x21, 0x14, 0x46, 0xc5,
+     0x60, 0x9b, 0x45, 0x95, 0x97, 0x6b, 0x16, 0xbd,
+    },
+  },
+  {
+    {0x7f, 0xff, 0xff, 0xc0, 0x00, 0xff, 0xfe, 0x3f,
+     0xff, 0xfc, 0x10, 0x00, 0x00, 0x20, 0x00, 0x3f,
+     0xff, 0xff, 0x00, 0x00, 0x00, 0xfc, 0x00, 0x00,
+     0x3f, 0xff, 0xff, 0xff, },
+    {0xdc, 0x9f, 0xa7, 0x79, 0x78, 0xa0, 0x05, 0x51,
+     0x09, 0x80, 0xe9, 0x29, 0xa1, 0x48, 0x5f, 0x63,
+     0x71, 0x6d, 0xf6, 0x95, 0xd7, 0xa0, 0xc1, 0x8b,
+     0xb5, 0x18, 0xdf, 0x03, 0xed, 0xe2, 0xb0, 0x16,
+     0xf2, 0xdd, 0xff, 0xc2, 0xa8, 0xc0, 0x15, 0xb1,
+     0x34, 0x92, 0x82, 0x75, 0xce, 0x09, 0xe5, 0x66,
+     0x1b, 0x7a, 0xb1, 0x4c, 0xe0, 0xd1, 0xd4, 0x03,
+    },
+  },
+  {
+    {0x70, 0x01, 0xf0, 0x00, 0x1c, 0x00, 0x01, 0xc0,
+     0x00, 0x00, 0x1f, 0xff, 0xff, 0xfc, 0x00, 0x00,
+     0x1f, 0xff, 0xff, 0xf8, 0x00, 0x0f, 0xc0, 0x00,
+     0x00, 0x01, 0xfc, 0x00, },
+    {0x49, 0x9d, 0x8b, 0x28, 0x29, 0xcf, 0xb8, 0x79,
+     0xc9, 0x01, 0xf7, 0xd8, 0x5d, 0x35, 0x70, 0x45,
+     0xed, 0xab, 0x55, 0x02, 0x88, 0x24, 0xd0, 0xf0,
+     0x5b, 0xa2, 0x79, 0xba, 0xbf, 0x92, 0x95, 0x37,
+     0xb0, 0x6e, 0x40, 0x15, 0x91, 0x96, 0x39, 0xd9,
+     0x4f, 0x57, 0x83, 0x8f, 0xa3, 0x3f, 0xc3, 0xd9,
+     0x52, 0x59, 0x8d, 0xcd, 0xbb, 0x44, 0xd6, 0x38,
+    },
+  },
+  {
+    {0x00, 0x00, 0x00, 0x00, 0x1f, 0xfc, 0x00, 0x00,
+     0x00, 0xff, 0xf0, 0x30, 0x00, 0x1f, 0x00, 0x00,
+     0xff, 0xff, 0xf0, 0x00, 0x00, 0x38, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x02, },
+    {0x82, 0x46, 0xc9, 0x99, 0x13, 0x71, 0x86, 0x63,
+     0x2c, 0x5f, 0x9e, 0xdd, 0xf3, 0xb1, 0xb0, 0xe1,
+     0x76, 0x4c, 0x5e, 0x8b, 0xd0, 0xe0, 0xd8, 0xa5,
+     0x54, 0xb9, 0xcb, 0x77, 0xe8, 0x0e, 0xd8, 0x66,
+     0x0b, 0xc1, 0xcb, 0x17, 0xac, 0x7d, 0x84, 0x5b,
+     0xe4, 0x0a, 0x7a, 0x02, 0x2d, 0x33, 0x06, 0xf1,
+     0x16, 0xae, 0x9f, 0x81, 0xfe, 0xa6, 0x59, 0x47,
+    },
+  },
+  {
+    {0x7f, 0xff, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x07, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0xff, 0xfe, 0x08, 0x00, 0x00, 0x1f,
+     0xf0, 0x00, 0x1f, 0xff, },
+    {0x66, 0x70, 0xc2, 0x0a, 0xfc, 0xce, 0xae, 0xa6,
+     0x72, 0xc9, 0x7f, 0x75, 0xe2, 0xe9, 0xdd, 0x5c,
+     0x84, 0x60, 0xe5, 0x4b, 0xb3, 0x85, 0x38, 0xeb,
+     0xb4, 0xbd, 0x30, 0xeb, 0xf2, 0x80, 0xd8, 0x00,
+     0x8d, 0x07, 0xa4, 0xca, 0xf5, 0x42, 0x71, 0xf9,
+     0x93, 0x52, 0x7d, 0x46, 0xff, 0x3f, 0xf4, 0x6f,
+     0xd1, 0x19, 0x0a, 0x3f, 0x1f, 0xaa, 0x4f, 0x74,
+    },
+  },
+  {
+    {0x00, 0x00, 0x7f, 0xff, 0xff, 0xff, 0xff, 0xff,
+     0xff, 0xc0, 0x00, 0x07, 0xff, 0xff, 0xe0, 0xff,
+     0xff, 0xff, 0xff, 0xff, 0xff, 0xf8, 0x00, 0xff,
+     0xff, 0xff, 0xff, 0xff, },
+    {0x00, 0x0e, 0xca, 0x93, 0x42, 0x47, 0x42, 0x5c,
+     0xfd, 0x94, 0x9b, 0x79, 0x5c, 0xb5, 0xce, 0x1e,
+     0xff, 0x40, 0x15, 0x50, 0x38, 0x6e, 0x28, 0xd1,
+     0xa4, 0xc5, 0xa8, 0xeb, 0xd4, 0xc0, 0x10, 0x40,
+     0xdb, 0xa1, 0x96, 0x28, 0x93, 0x1b, 0xc8, 0x85,
+     0x53, 0x70, 0x31, 0x7c, 0x72, 0x2c, 0xbd, 0x9c,
+     0xa6, 0x15, 0x69, 0x85, 0xf1, 0xc2, 0xe9, 0xce,
+    },
+  },
+  {
+    {0x7f, 0xff, 0xfc, 0x03, 0xff, 0x80, 0x7f, 0xff,
+     0xe0, 0x00, 0x1f, 0xff, 0xff, 0x80, 0x0f, 0xff,
+     0x80, 0x00, 0x01, 0xff, 0xff, 0x00, 0x01, 0xff,
+     0xff, 0xfe, 0x00, 0x1f, },
+    {0xef, 0x35, 0x3b, 0xf5, 0xc7, 0x3c, 0xd5, 0x51,
+     0xb9, 0x6d, 0x59, 0x6f, 0xbc, 0x9a, 0x67, 0xf1,
+     0x6d, 0x61, 0xdd, 0x9f, 0xe5, 0x6a, 0xf1, 0x9d,
+     0xe1, 0xfb, 0xa9, 0xcd, 0x21, 0x77, 0x1b, 0x9c,
+     0xdc, 0xe3, 0xe8, 0x43, 0x0c, 0x09, 0xb3, 0x83,
+     0x8b, 0xe7, 0x0b, 0x48, 0xc2, 0x1e, 0x15, 0xbc,
+     0x09, 0xee, 0x1f, 0x2d, 0x79, 0x45, 0xb9, 0x1f,
+    },
+  },
+  {
+    {0x00, 0x00, 0x00, 0x07, 0xff, 0xc0, 0x7f, 0xff,
+     0xff, 0xff, 0x01, 0xff, 0xfe, 0x03, 0xff, 0xfe,
+     0x40, 0x00, 0x38, 0x00, 0x07, 0xe0, 0x00, 0x3f,
+     0xfe, 0x00, 0x00, 0x00, },
+    {0x40, 0x36, 0x05, 0x2a, 0x30, 0x91, 0xeb, 0x48,
+     0x10, 0x46, 0xad, 0x32, 0x89, 0xc9, 0x5d, 0x3a,
+     0xc9, 0x05, 0xca, 0x00, 0x23, 0xde, 0x2c, 0x03,
+     0xec, 0xd4, 0x51, 0xcf, 0xd7, 0x68, 0x16, 0x5a,
+     0x38, 0xa2, 0xb9, 0x6f, 0x81, 0x25, 0x86, 0xa9,
+     0xd5, 0x9d, 0x41, 0x36, 0x03, 0x5d, 0x9c, 0x85,
+     0x3a, 0x5b, 0xf2, 0xe1, 0xc8, 0x6a, 0x49, 0x93,
+    },
+  },
+  {
+    {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x16, 0xa2,
+     0xe0, 0xb8, 0xf0, 0x3e, 0x13, 0xdd, 0x29, 0x45,
+     0x5c, 0x5c, 0x2a, 0x29, },
+    {0xfc, 0xc7, 0xf2, 0xb4, 0x5d, 0xf1, 0xcd, 0x5a,
+     0x3c, 0x0c, 0x07, 0x31, 0xca, 0x47, 0xa8, 0xaf,
+     0x75, 0xcf, 0xb0, 0x34, 0x7e, 0x83, 0x54, 0xee,
+     0xfe, 0x78, 0x24, 0x55, 0xf2, 0xa2, 0x8e, 0xef,
+     0xd8, 0xb3, 0x45, 0x83, 0x21, 0x16, 0xf1, 0xe5,
+     0x74, 0xf2, 0xc6, 0xb2, 0xc8, 0x95, 0xaa, 0x8c,
+     0x24, 0x94, 0x1f, 0x40, 0xd8, 0xb8, 0x0a, 0xd1,
+    },
+  },
+  {
+    {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x16, 0xa2,
+     0xe0, 0xb8, 0xf0, 0x3e, 0x13, 0xdd, 0x29, 0x45,
+     0x5c, 0x5c, 0x2a, 0x2a, },
+    {0xa1, 0xe8, 0x1c, 0x04, 0xf3, 0x0c, 0xe2, 0x01,
+     0xc7, 0xc9, 0xac, 0xe7, 0x85, 0xed, 0x44, 0xcc,
+     0x33, 0xb4, 0x55, 0xa0, 0x22, 0xf2, 0xac, 0xdb,
+     0xc6, 0xca, 0xe8, 0x3c, 0x23, 0x0e, 0x09, 0x3c,
+     0x24, 0xf6, 0x38, 0xf5, 0x33, 0xda, 0xc6, 0xe2,
+     0xb6, 0xd0, 0x1d, 0xa3, 0xb5, 0xe7, 0xf4, 0x54,
+     0x29, 0x31, 0x5c, 0xa9, 0x3f, 0xb8, 0xe6, 0x34,
+    },
+  },
+  {
+    {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x16, 0xa2,
+     0xe0, 0xb8, 0xf0, 0x3e, 0x13, 0xdd, 0x29, 0x45,
+     0x5c, 0x5c, 0x2a, 0x2b, },
+    {0xc9, 0xff, 0x61, 0xb0, 0x40, 0x87, 0x4c, 0x05,
+     0x68, 0x47, 0x92, 0x16, 0x82, 0x4a, 0x15, 0xea,
+     0xb1, 0xa8, 0x38, 0xa7, 0x97, 0xd1, 0x89, 0x74,
+     0x62, 0x26, 0xe4, 0xcc, 0x15, 0x67, 0x29, 0xf1,
+     0xa0, 0x03, 0x64, 0x70, 0x30, 0x66, 0x60, 0x54,
+     0xe2, 0x08, 0x18, 0x0f, 0x8f, 0x7b, 0x0d, 0xf2,
+     0x24, 0x9e, 0x44, 0xfb, 0xa5, 0x93, 0x1f, 0xff,
+    },
+  },
+  {
+    {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x16, 0xa2,
+     0xe0, 0xb8, 0xf0, 0x3e, 0x13, 0xdd, 0x29, 0x45,
+     0x5c, 0x5c, 0x2a, 0x2c, },
+    {0xb8, 0x35, 0x7c, 0x3a, 0x6c, 0xee, 0xf2, 0x88,
+     0x31, 0x0e, 0x17, 0xb8, 0xbf, 0xef, 0xf9, 0x20,
+     0x08, 0x46, 0xca, 0x8c, 0x19, 0x42, 0x49, 0x7c,
+     0x48, 0x44, 0x03, 0xbc, 0x00, 0xeb, 0x61, 0x05,
+     0x99, 0xf9, 0x59, 0x42, 0xdf, 0x10, 0x82, 0xe4,
+     0xf9, 0x42, 0x6d, 0x08, 0x6f, 0xb9, 0xc6, 0x23,
+     0x1a, 0xe8, 0xb2, 0x49, 0x33, 0xaa, 0xb5, 0xdb,
+    },
+  },
+  {
+    {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x16, 0xa2,
+     0xe0, 0xb8, 0xf0, 0x3e, 0x13, 0xdd, 0x29, 0x45,
+     0x5c, 0x5c, 0x2a, 0x2d, },
+    {0x0b, 0x6e, 0xc4, 0xfe, 0x17, 0x77, 0x38, 0x24,
+     0x04, 0xef, 0x67, 0x99, 0x97, 0xba, 0x8d, 0x1c,
+     0xc5, 0xcd, 0x8e, 0x85, 0x34, 0x92, 0x59, 0xf5,
+     0x90, 0xc4, 0xc6, 0x6d, 0xcc, 0x66, 0x2b, 0x9b,
+     0xcb, 0xa6, 0xf9, 0x4e, 0xe4, 0xff, 0x1c, 0x9c,
+     0x10, 0xbd, 0x6d, 0xdd, 0x0d, 0x13, 0x8d, 0xf2,
+     0xd0, 0x99, 0xa2, 0x82, 0x15, 0x2a, 0x4b, 0x7f,
+    },
+  },
+  {
+    {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x16, 0xa2,
+     0xe0, 0xb8, 0xf0, 0x3e, 0x13, 0xdd, 0x29, 0x45,
+     0x5c, 0x5c, 0x2a, 0x2e, },
+    {0xba, 0xa4, 0xd8, 0x63, 0x55, 0x11, 0xa7, 0xd2,
+     0x88, 0xae, 0xbe, 0xed, 0xd1, 0x2c, 0xe5, 0x29,
+     0xff, 0x10, 0x2c, 0x91, 0xf9, 0x7f, 0x86, 0x7e,
+     0x21, 0x91, 0x6b, 0xf9, 0x68, 0x65, 0xa0, 0xb8,
+     0xa6, 0x07, 0xf0, 0xb0, 0x4b, 0x13, 0xd1, 0xcb,
+     0x0a, 0xa9, 0x92, 0xa5, 0xa9, 0x7f, 0x5e, 0xe8,
+     0xca, 0x18, 0x49, 0xef, 0xb9, 0xed, 0x86, 0x78,
+    },
+  },
+  {
+    {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x16, 0xa2,
+     0xe0, 0xb8, 0xf0, 0x3e, 0x13, 0xdd, 0x29, 0x45,
+     0x5c, 0x5c, 0x2a, 0x2f, },
+    {0xa5, 0x36, 0x40, 0xc8, 0x3d, 0xc2, 0x08, 0x60,
+     0x3d, 0xed, 0x83, 0xe4, 0xec, 0xf7, 0x58, 0xf2,
+     0x4c, 0x35, 0x7d, 0x7c, 0xf4, 0x80, 0x88, 0xb2,
+     0xce, 0x01, 0xe9, 0xfa, 0x2a, 0x7e, 0xb3, 0x28,
+     0xdb, 0xe6, 0x63, 0xb5, 0xa4, 0x68, 0xb5, 0xbc,
+     0x97, 0xa0, 0x40, 0xa3, 0x74, 0x53, 0x96, 0xba,
+     0x63, 0x6b, 0x96, 0x43, 0x70, 0xdc, 0x33, 0x52,
+    },
+  },
+  {
+    {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x16, 0xa2,
+     0xe0, 0xb8, 0xf0, 0x3e, 0x13, 0xdd, 0x29, 0x45,
+     0x5c, 0x5c, 0x2a, 0x30, },
+    {0x34, 0xe8, 0xe1, 0x7a, 0x43, 0x0e, 0x43, 0x28,
+     0x97, 0x93, 0xc3, 0x83, 0xfa, 0xc9, 0x77, 0x42,
+     0x47, 0xb4, 0x0e, 0x9e, 0xbd, 0x33, 0x66, 0x98,
+     0x1f, 0xcf, 0xae, 0xca, 0xda, 0xd7, 0xe6, 0x08,
+     0xe3, 0x80, 0x48, 0x04, 0x34, 0xea, 0x64, 0x1c,
+     0xc8, 0x2c, 0x82, 0xcb, 0xc9, 0x28, 0x01, 0x46,
+     0x9c, 0x8d, 0xb0, 0x20, 0x4f, 0x13, 0x48, 0x9a,
+    },
+  },
+  {
+    {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x16, 0xa2,
+     0xe0, 0xb8, 0xf0, 0x3e, 0x13, 0xdd, 0x29, 0x45,
+     0x5c, 0x5c, 0x2a, 0x31, },
+    {0x6e, 0x31, 0xee, 0x1d, 0xc1, 0x37, 0xf8, 0x1b,
+     0x05, 0x67, 0x52, 0xe4, 0xde, 0xab, 0x14, 0x43,
+     0xa4, 0x81, 0x03, 0x3e, 0x9b, 0x4c, 0x93, 0xa3,
+     0x04, 0x4f, 0x4f, 0x7a, 0xdf, 0x82, 0x22, 0x0f,
+     0xc7, 0xa4, 0x02, 0x15, 0x49, 0x16, 0x53, 0x25,
+     0x72, 0x5f, 0x94, 0xc3, 0x41, 0x0d, 0xdb, 0x56,
+     0xc5, 0x4e, 0x16, 0x1f, 0xc9, 0xef, 0x62, 0xee,
+    },
+  },
+  {
+    {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x16, 0xa2,
+     0xe0, 0xb8, 0xf0, 0x3e, 0x13, 0xdd, 0x29, 0x45,
+     0x5c, 0x5c, 0x2a, 0x32, },
+    {0xef, 0x53, 0xb6, 0x29, 0x4a, 0xca, 0x43, 0x1f,
+     0x0f, 0x3c, 0x22, 0xdc, 0x82, 0xeb, 0x90, 0x50,
+     0x32, 0x4f, 0x1d, 0x88, 0xd3, 0x77, 0xe7, 0x16,
+     0x44, 0x8e, 0x50, 0x7c, 0xdf, 0x4a, 0xef, 0xff,
+     0xbf, 0x6d, 0x16, 0x99, 0xc9, 0x30, 0x48, 0x1c,
+     0xd1, 0x02, 0x12, 0x7c, 0x9a, 0x3d, 0x99, 0x20,
+     0x48, 0xab, 0x05, 0x92, 0x9b, 0x6e, 0x59, 0x27,
+    },
+  },
+  {
+    {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x16, 0xa2,
+     0xe0, 0xb8, 0xf0, 0x3e, 0x13, 0xdd, 0x29, 0x45,
+     0x5c, 0x5c, 0x2a, 0x33, },
+    {0xae, 0xa9, 0xe1, 0x7a, 0x30, 0x65, 0x17, 0xeb,
+     0x89, 0x15, 0x2a, 0xa7, 0x09, 0x6d, 0x2c, 0x38,
+     0x1e, 0xc8, 0x13, 0xc5, 0x1a, 0xa8, 0x80, 0xe7,
+     0xbe, 0xe2, 0xc0, 0xfd, 0xc6, 0x44, 0xcf, 0x15,
+     0x4c, 0xc8, 0x1f, 0x5a, 0xde, 0x49, 0x34, 0x5e,
+     0x54, 0x1b, 0x4d, 0x4b, 0x5c, 0x1a, 0xdb, 0x3e,
+     0xb5, 0xc0, 0x1c, 0x14, 0xee, 0x94, 0x9a, 0xa2,
+    },
+  },
+  {
+    {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x16, 0xa2,
+     0xe0, 0xb8, 0xf0, 0x3e, 0x13, 0xdd, 0x29, 0x45,
+     0x5c, 0x5c, 0x2a, 0x34, },
+    {0x2f, 0xdc, 0xcc, 0xfe, 0xe7, 0x20, 0xa7, 0x7e,
+     0xf6, 0xcb, 0x3b, 0xfb, 0xb4, 0x47, 0xf9, 0x38,
+     0x31, 0x17, 0xe3, 0xda, 0xa4, 0xa0, 0x7e, 0x36,
+     0xed, 0x15, 0xf7, 0x8d, 0xc8, 0xe8, 0xcd, 0x1b,
+     0x0b, 0xe4, 0x0b, 0x08, 0x77, 0xcf, 0xca, 0x19,
+     0x58, 0x60, 0x31, 0x22, 0xf1, 0xe6, 0x91, 0x4f,
+     0x84, 0xb7, 0xe8, 0xe9, 0x68, 0xae, 0x8b, 0x9e,
+    },
+  },
+  {
+    {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x16, 0xa2,
+     0xe0, 0xb8, 0xf0, 0x3e, 0x13, 0xdd, 0x29, 0x45,
+     0x5c, 0x5c, 0x2a, 0x35, },
+    {0x85, 0x8e, 0x6f, 0x9c, 0xc6, 0xc1, 0x2c, 0x31,
+     0xf5, 0xdf, 0x12, 0x4a, 0xa7, 0x77, 0x67, 0xb0,
+     0x5c, 0x8b, 0xc0, 0x21, 0xbd, 0x68, 0x3d, 0x2b,
+     0x55, 0x57, 0x15, 0x50, 0xfb, 0x92, 0x32, 0xc1,
+     0x5a, 0x3b, 0xc7, 0x67, 0x3a, 0x3a, 0x03, 0xb0,
+     0x25, 0x38, 0x24, 0xc5, 0x3d, 0x0f, 0xd1, 0x41,
+     0x1b, 0x1c, 0xab, 0xe2, 0xe1, 0x87, 0xfb, 0x87,
+    },
+  },
+  {
+    {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x16, 0xa2,
+     0xe0, 0xb8, 0xf0, 0x3e, 0x13, 0xdd, 0x29, 0x45,
+     0x5c, 0x5c, 0x2a, 0x36, },
+    {0xdb, 0x2f, 0x6b, 0xe6, 0x30, 0xe2, 0x46, 0xa5,
+     0xcf, 0x7d, 0x99, 0xb8, 0x51, 0x94, 0xb1, 0x23,
+     0xd4, 0x87, 0xe2, 0xd4, 0x66, 0xb9, 0x4b, 0x24,
+     0xa0, 0x3c, 0x3e, 0x28, 0xf0, 0xc5, 0xcf, 0xf7,
+     0xab, 0x68, 0x0d, 0x09, 0xee, 0x11, 0xda, 0xe8,
+     0x4e, 0x9c, 0x10, 0x72, 0xac, 0x48, 0xea, 0x2e,
+     0x74, 0x4b, 0x1b, 0x7f, 0x72, 0xfd, 0x46, 0x9e,
+    },
+  },
+  {
+    {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x16, 0xa2,
+     0xe0, 0xb8, 0xf0, 0x3e, 0x13, 0xdd, 0x29, 0x45,
+     0x5c, 0x5c, 0x2a, 0x37, },
+    {0x1f, 0x24, 0x83, 0xf8, 0x25, 0x72, 0x25, 0x1f,
+     0xca, 0x97, 0x5f, 0xea, 0x40, 0xdb, 0x82, 0x1d,
+     0xf8, 0xad, 0x82, 0xa3, 0xc0, 0x02, 0xee, 0x6c,
+     0x57, 0x11, 0x24, 0x08, 0x76, 0x05, 0x0f, 0x33,
+     0x48, 0xaf, 0x26, 0x64, 0xaa, 0xc3, 0xa8, 0xb0,
+     0x52, 0x81, 0x30, 0x4e, 0xbc, 0x7a, 0x79, 0x14,
+     0xc6, 0xad, 0x50, 0xa4, 0xb4, 0xea, 0xc3, 0x83,
+    },
+  },
+  {
+    {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x16, 0xa2,
+     0xe0, 0xb8, 0xf0, 0x3e, 0x13, 0xdd, 0x29, 0x45,
+     0x5c, 0x5c, 0x2a, 0x38, },
+    {0x31, 0xc4, 0x9a, 0xe7, 0x5b, 0xce, 0x78, 0x07,
+     0xcd, 0xff, 0x22, 0x05, 0x5d, 0x94, 0xee, 0x90,
+     0x21, 0xfe, 0xdb, 0xb5, 0xab, 0x51, 0xc5, 0x75,
+     0x26, 0xf0, 0x11, 0xaa, 0xd8, 0x17, 0x40, 0x0e,
+     0x8b, 0xa9, 0xca, 0x13, 0xa4, 0x5f, 0x36, 0x0e,
+     0x3d, 0x12, 0x1e, 0xaa, 0xeb, 0x39, 0xaf, 0x82,
+     0xd6, 0x00, 0x1c, 0x81, 0x86, 0xf5, 0xf8, 0x66,
+    },
+  },
+  {
+    {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x16, 0xa2,
+     0xe0, 0xb8, 0xf0, 0x3e, 0x13, 0xdd, 0x29, 0x45,
+     0x5c, 0x5c, 0x2a, 0x39, },
+    {0xae, 0x99, 0xfe, 0xeb, 0xb5, 0xd2, 0x69, 0x45,
+     0xb5, 0x48, 0x92, 0x09, 0x2a, 0x8a, 0xee, 0x02,
+     0x91, 0x29, 0x30, 0xfa, 0x41, 0xcd, 0x11, 0x4e,
+     0x40, 0x44, 0x73, 0x01, 0xfb, 0x7d, 0xa7, 0xf5,
+     0xf1, 0x3a, 0x43, 0xb8, 0x17, 0x74, 0x37, 0x3c,
+     0x87, 0x9c, 0xd3, 0x2d, 0x69, 0x34, 0xc0, 0x5f,
+     0xa7, 0x58, 0xee, 0xb1, 0x4f, 0xcf, 0xab, 0x38,
+    },
+  },
+  {
+    {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x16, 0xa2,
+     0xe0, 0xb8, 0xf0, 0x3e, 0x13, 0xdd, 0x29, 0x45,
+     0x5c, 0x5c, 0x2a, 0x3a, },
+    {0xdf, 0x1b, 0x1d, 0x66, 0xa5, 0x51, 0xd0, 0xd3,
+     0x1e, 0xff, 0x82, 0x25, 0x58, 0xb9, 0xd2, 0xcc,
+     0x75, 0xc2, 0x18, 0x02, 0x79, 0xfe, 0x0d, 0x08,
+     0xfd, 0x89, 0x6d, 0x04, 0x5c, 0x08, 0x0f, 0xc3,
+     0x52, 0x2f, 0x41, 0xbb, 0xb3, 0xf5, 0x5a, 0x97,
+     0xcf, 0xec, 0xf2, 0x1f, 0x88, 0x2c, 0xe8, 0xcb,
+     0xb1, 0xe5, 0x0c, 0xa6, 0xe6, 0x7e, 0x56, 0xdc,
+    },
+  },
+  {
+    {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x16, 0xa2,
+     0xe0, 0xb8, 0xf0, 0x3e, 0x13, 0xdd, 0x29, 0x45,
+     0x5c, 0x5c, 0x2a, 0x3b, },
+    {0x70, 0x6a, 0x46, 0xdc, 0x76, 0xdc, 0xb7, 0x67,
+     0x98, 0xe6, 0x0e, 0x6d, 0x89, 0x47, 0x47, 0x88,
+     0xd1, 0x6d, 0xc1, 0x80, 0x32, 0xd2, 0x68, 0xfd,
+     0x1a, 0x70, 0x4f, 0xa6, 0xe3, 0xd4, 0x89, 0x58,
+     0x43, 0xda, 0x18, 0x8f, 0xd5, 0x8f, 0xb0, 0x56,
+     0x79, 0x76, 0xd7, 0xb5, 0x03, 0x59, 0xd6, 0xb7,
+     0x85, 0x30, 0xc8, 0xf6, 0x2d, 0x1b, 0x17, 0x46,
+    },
+  },
+  {
+    {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x16, 0xa2,
+     0xe0, 0xb8, 0xf0, 0x3e, 0x13, 0xdd, 0x29, 0x45,
+     0x5c, 0x5c, 0x2a, 0x3c, },
+    {0xb7, 0x0e, 0x0c, 0xbd, 0x6b, 0xb4, 0xbf, 0x7f,
+     0x32, 0x13, 0x90, 0xb9, 0x4a, 0x03, 0xc1, 0xd3,
+     0x56, 0xc2, 0x11, 0x22, 0x34, 0x32, 0x80, 0xd6,
+     0x11, 0x5c, 0x1d, 0x21, 0x42, 0xc8, 0x9c, 0x77,
+     0x4a, 0x08, 0xdc, 0x04, 0xb3, 0xdd, 0x20, 0x19,
+     0x32, 0xbc, 0x8a, 0x5e, 0xa5, 0xf8, 0xb8, 0x9b,
+     0xbb, 0x2a, 0x7e, 0x66, 0x7a, 0xff, 0x81, 0xcd,
+    },
+  },
+};
+
+TEST(P224, ExternalToInternalAndBack) {
+  Point point;
+
+  EXPECT_TRUE(point.SetFromString(base::StringPiece(
+      reinterpret_cast<const char *>(kBasePointExternal),
+      sizeof(kBasePointExternal))));
+
+  const std::string external = point.ToString();
+
+  ASSERT_EQ(external.size(), 56u);
+  EXPECT_TRUE(memcmp(external.data(), kBasePointExternal,
+                     sizeof(kBasePointExternal)) == 0);
+}
+
+TEST(P224, ScalarBaseMult) {
+  Point point;
+
+  for (size_t i = 0; i < arraysize(kNISTTestVectors); i++) {
+    p224::ScalarBaseMult(kNISTTestVectors[i].scalar, &point);
+    const std::string external = point.ToString();
+    ASSERT_EQ(external.size(), 56u);
+    EXPECT_TRUE(memcmp(external.data(), kNISTTestVectors[i].affine,
+                       external.size()) == 0);
+  }
+}
+
+TEST(P224, Addition) {
+  Point a, b, minus_b, sum, a_again;
+
+  ASSERT_TRUE(a.SetFromString(base::StringPiece(
+      reinterpret_cast<const char *>(kNISTTestVectors[10].affine), 56)));
+  ASSERT_TRUE(b.SetFromString(base::StringPiece(
+      reinterpret_cast<const char *>(kNISTTestVectors[11].affine), 56)));
+
+  p224::Negate(b, &minus_b);
+  p224::Add(a, b, &sum);
+  EXPECT_TRUE(memcmp(&sum, &a, sizeof(sum)) != 0);
+  p224::Add(minus_b, sum, &a_again);
+  EXPECT_TRUE(a_again.ToString() == a.ToString());
+}
+
+TEST(P224, Infinity) {
+  char zeros[56];
+  memset(zeros, 0, sizeof(zeros));
+
+  // Test that x^0 = ∞.
+  Point a;
+  p224::ScalarBaseMult(reinterpret_cast<const uint8*>(zeros), &a);
+  EXPECT_TRUE(memcmp(zeros, a.ToString().data(), sizeof(zeros)) == 0);
+
+  // We shouldn't allow ∞ to be imported.
+  EXPECT_FALSE(a.SetFromString(std::string(zeros, sizeof(zeros))));
+}
+
+}  // namespace crypto
diff --git a/libweave/external/crypto/random.cc b/libweave/external/crypto/random.cc
new file mode 100644
index 0000000..a19bb1a
--- /dev/null
+++ b/libweave/external/crypto/random.cc
@@ -0,0 +1,19 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "crypto/random.h"
+
+#include "base/rand_util.h"
+
+namespace crypto {
+
+void RandBytes(void *bytes, size_t length) {
+  // It's OK to call base::RandBytes(), because it's already strongly random.
+  // But _other_ code should go through this function to ensure that code which
+  // needs secure randomness is easily discoverable.
+  base::RandBytes(bytes, length);
+}
+
+}  // namespace crypto
+
diff --git a/libweave/external/crypto/random.h b/libweave/external/crypto/random.h
new file mode 100644
index 0000000..002616b
--- /dev/null
+++ b/libweave/external/crypto/random.h
@@ -0,0 +1,21 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CRYPTO_RANDOM_H_
+#define CRYPTO_RANDOM_H_
+
+#include <stddef.h>
+
+#include "crypto/crypto_export.h"
+
+namespace crypto {
+
+// Fills the given buffer with |length| random bytes of cryptographically
+// secure random numbers.
+// |length| must be positive.
+CRYPTO_EXPORT void RandBytes(void *bytes, size_t length);
+
+}
+
+#endif
diff --git a/libweave/external/crypto/secure_util.cc b/libweave/external/crypto/secure_util.cc
new file mode 100644
index 0000000..3fe8aa9
--- /dev/null
+++ b/libweave/external/crypto/secure_util.cc
@@ -0,0 +1,19 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "crypto/secure_util.h"
+
+namespace crypto {
+
+bool SecureMemEqual(const void* s1, const void* s2, size_t n) {
+  const unsigned char* s1_ptr = reinterpret_cast<const unsigned char*>(s1);
+  const unsigned char* s2_ptr = reinterpret_cast<const unsigned char*>(s2);
+  unsigned char tmp = 0;
+  for (size_t i = 0; i < n; ++i, ++s1_ptr, ++s2_ptr)
+    tmp |= *s1_ptr ^ *s2_ptr;
+  return (tmp == 0);
+}
+
+}  // namespace crypto
+
diff --git a/libweave/external/crypto/secure_util.h b/libweave/external/crypto/secure_util.h
new file mode 100644
index 0000000..cfe05ca
--- /dev/null
+++ b/libweave/external/crypto/secure_util.h
@@ -0,0 +1,29 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CRYPTO_SECURE_UTIL_H_
+#define CRYPTO_SECURE_UTIL_H_
+
+#include <stddef.h>
+
+#include "crypto/crypto_export.h"
+
+namespace crypto {
+
+// Performs a constant-time comparison of two strings, returning true if the
+// strings are equal.
+//
+// For cryptographic operations, comparison functions such as memcmp() may
+// expose side-channel information about input, allowing an attacker to
+// perform timing analysis to determine what the expected bits should be. In
+// order to avoid such attacks, the comparison must execute in constant time,
+// so as to not to reveal to the attacker where the difference(s) are.
+// For an example attack, see
+// http://groups.google.com/group/keyczar-discuss/browse_thread/thread/5571eca0948b2a13
+CRYPTO_EXPORT bool SecureMemEqual(const void* s1, const void* s2, size_t n);
+
+}  // namespace crypto
+
+#endif  // CRYPTO_SECURE_UTIL_H_
+
diff --git a/libweave/external/crypto/sha2.cc b/libweave/external/crypto/sha2.cc
new file mode 100644
index 0000000..6f36237
--- /dev/null
+++ b/libweave/external/crypto/sha2.cc
@@ -0,0 +1,25 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "crypto/sha2.h"
+
+#include "base/memory/scoped_ptr.h"
+#include "base/stl_util.h"
+#include "crypto/secure_hash.h"
+
+namespace crypto {
+
+void SHA256HashString(const base::StringPiece& str, void* output, size_t len) {
+  scoped_ptr<SecureHash> ctx(SecureHash::Create(SecureHash::SHA256));
+  ctx->Update(str.data(), str.length());
+  ctx->Finish(output, len);
+}
+
+std::string SHA256HashString(const base::StringPiece& str) {
+  std::string output(kSHA256Length, 0);
+  SHA256HashString(str, string_as_array(&output), output.size());
+  return output;
+}
+
+}  // namespace crypto
diff --git a/libweave/external/crypto/sha2.h b/libweave/external/crypto/sha2.h
new file mode 100644
index 0000000..7e279d3
--- /dev/null
+++ b/libweave/external/crypto/sha2.h
@@ -0,0 +1,33 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CRYPTO_SHA2_H_
+#define CRYPTO_SHA2_H_
+
+#include <string>
+
+#include "base/strings/string_piece.h"
+#include "crypto/crypto_export.h"
+
+namespace crypto {
+
+// These functions perform SHA-256 operations.
+//
+// Functions for SHA-384 and SHA-512 can be added when the need arises.
+
+static const size_t kSHA256Length = 32;  // Length in bytes of a SHA-256 hash.
+
+// Computes the SHA-256 hash of the input string 'str' and stores the first
+// 'len' bytes of the hash in the output buffer 'output'.  If 'len' > 32,
+// only 32 bytes (the full hash) are stored in the 'output' buffer.
+CRYPTO_EXPORT void SHA256HashString(const base::StringPiece& str,
+                                    void* output, size_t len);
+
+// Convenience version of the above that returns the result in a 32-byte
+// string.
+CRYPTO_EXPORT std::string SHA256HashString(const base::StringPiece& str);
+
+}  // namespace crypto
+
+#endif  // CRYPTO_SHA2_H_
diff --git a/libweave/external/crypto/sha2_unittest.cc b/libweave/external/crypto/sha2_unittest.cc
new file mode 100644
index 0000000..78da136
--- /dev/null
+++ b/libweave/external/crypto/sha2_unittest.cc
@@ -0,0 +1,100 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "crypto/sha2.h"
+
+#include "base/basictypes.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+TEST(Sha256Test, Test1) {
+  // Example B.1 from FIPS 180-2: one-block message.
+  std::string input1 = "abc";
+  int expected1[] = { 0xba, 0x78, 0x16, 0xbf,
+                      0x8f, 0x01, 0xcf, 0xea,
+                      0x41, 0x41, 0x40, 0xde,
+                      0x5d, 0xae, 0x22, 0x23,
+                      0xb0, 0x03, 0x61, 0xa3,
+                      0x96, 0x17, 0x7a, 0x9c,
+                      0xb4, 0x10, 0xff, 0x61,
+                      0xf2, 0x00, 0x15, 0xad };
+
+  uint8 output1[crypto::kSHA256Length];
+  crypto::SHA256HashString(input1, output1, sizeof(output1));
+  for (size_t i = 0; i < crypto::kSHA256Length; i++)
+    EXPECT_EQ(expected1[i], static_cast<int>(output1[i]));
+
+  uint8 output_truncated1[4];  // 4 bytes == 32 bits
+  crypto::SHA256HashString(input1,
+                           output_truncated1, sizeof(output_truncated1));
+  for (size_t i = 0; i < sizeof(output_truncated1); i++)
+    EXPECT_EQ(expected1[i], static_cast<int>(output_truncated1[i]));
+}
+
+TEST(Sha256Test, Test1_String) {
+  // Same as the above, but using the wrapper that returns a std::string.
+  // Example B.1 from FIPS 180-2: one-block message.
+  std::string input1 = "abc";
+  int expected1[] = { 0xba, 0x78, 0x16, 0xbf,
+                      0x8f, 0x01, 0xcf, 0xea,
+                      0x41, 0x41, 0x40, 0xde,
+                      0x5d, 0xae, 0x22, 0x23,
+                      0xb0, 0x03, 0x61, 0xa3,
+                      0x96, 0x17, 0x7a, 0x9c,
+                      0xb4, 0x10, 0xff, 0x61,
+                      0xf2, 0x00, 0x15, 0xad };
+
+  std::string output1 = crypto::SHA256HashString(input1);
+  ASSERT_EQ(crypto::kSHA256Length, output1.size());
+  for (size_t i = 0; i < crypto::kSHA256Length; i++)
+    EXPECT_EQ(expected1[i], static_cast<uint8>(output1[i]));
+}
+
+TEST(Sha256Test, Test2) {
+  // Example B.2 from FIPS 180-2: multi-block message.
+  std::string input2 =
+      "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq";
+  int expected2[] = { 0x24, 0x8d, 0x6a, 0x61,
+                      0xd2, 0x06, 0x38, 0xb8,
+                      0xe5, 0xc0, 0x26, 0x93,
+                      0x0c, 0x3e, 0x60, 0x39,
+                      0xa3, 0x3c, 0xe4, 0x59,
+                      0x64, 0xff, 0x21, 0x67,
+                      0xf6, 0xec, 0xed, 0xd4,
+                      0x19, 0xdb, 0x06, 0xc1 };
+
+  uint8 output2[crypto::kSHA256Length];
+  crypto::SHA256HashString(input2, output2, sizeof(output2));
+  for (size_t i = 0; i < crypto::kSHA256Length; i++)
+    EXPECT_EQ(expected2[i], static_cast<int>(output2[i]));
+
+  uint8 output_truncated2[6];
+  crypto::SHA256HashString(input2,
+                           output_truncated2, sizeof(output_truncated2));
+  for (size_t i = 0; i < sizeof(output_truncated2); i++)
+    EXPECT_EQ(expected2[i], static_cast<int>(output_truncated2[i]));
+}
+
+TEST(Sha256Test, Test3) {
+  // Example B.3 from FIPS 180-2: long message.
+  std::string input3(1000000, 'a');  // 'a' repeated a million times
+  int expected3[] = { 0xcd, 0xc7, 0x6e, 0x5c,
+                      0x99, 0x14, 0xfb, 0x92,
+                      0x81, 0xa1, 0xc7, 0xe2,
+                      0x84, 0xd7, 0x3e, 0x67,
+                      0xf1, 0x80, 0x9a, 0x48,
+                      0xa4, 0x97, 0x20, 0x0e,
+                      0x04, 0x6d, 0x39, 0xcc,
+                      0xc7, 0x11, 0x2c, 0xd0 };
+
+  uint8 output3[crypto::kSHA256Length];
+  crypto::SHA256HashString(input3, output3, sizeof(output3));
+  for (size_t i = 0; i < crypto::kSHA256Length; i++)
+    EXPECT_EQ(expected3[i], static_cast<int>(output3[i]));
+
+  uint8 output_truncated3[12];
+  crypto::SHA256HashString(input3,
+                           output_truncated3, sizeof(output_truncated3));
+  for (size_t i = 0; i < sizeof(output_truncated3); i++)
+    EXPECT_EQ(expected3[i], static_cast<int>(output_truncated3[i]));
+}