diff --git a/buffet/error.cc b/buffet/error.cc
new file mode 100644
index 0000000..b04bbb6
--- /dev/null
+++ b/buffet/error.cc
@@ -0,0 +1,63 @@
+// Copyright 2014 The Chromium OS 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 "buffet/error.h"
+
+#include <base/logging.h>
+
+using chromeos::Error;
+using chromeos::ErrorPtr;
+
+ErrorPtr Error::Create(const std::string& domain,
+                       const std::string& code,
+                       const std::string& message) {
+  return Create(domain, code, message, ErrorPtr());
+}
+
+ErrorPtr Error::Create(const std::string& domain,
+                       const std::string& code,
+                       const std::string& message,
+                       ErrorPtr inner_error) {
+  LOG(ERROR) << "Error::Create: Domain=" << domain
+             << ", Code=" << code << ", Message=" << message;
+  return ErrorPtr(new Error(domain, code, message, std::move(inner_error)));
+}
+
+void Error::AddTo(ErrorPtr* error, const std::string& domain,
+                  const std::string& code, const std::string& message) {
+  if (error) {
+    *error = Create(domain, code, message, std::move(*error));
+  } else {
+    // Create already logs the error, but if |error| is nullptr,
+    // we still want to log the error...
+    LOG(ERROR) << "Error::Create: Domain=" << domain
+               << ", Code=" << code << ", Message=" << message;
+  }
+}
+
+bool Error::HasDomain(const std::string& domain) const {
+  const Error* err = this;
+  while (err) {
+    if (err->GetDomain() == domain)
+      return true;
+    err = err->GetInnerError();
+  }
+  return false;
+}
+
+bool Error::HasError(const std::string& domain, const std::string& code) const {
+  const Error* err = this;
+  while (err) {
+    if (err->GetDomain() == domain && err->GetCode() == code)
+      return true;
+    err = err->GetInnerError();
+  }
+  return false;
+}
+
+Error::Error(const std::string& domain, const std::string& code,
+             const std::string& message, ErrorPtr inner_error) :
+    domain_(domain), code_(code), message_(message),
+    inner_error_(std::move(inner_error)) {
+}