Abstracts SHA256 context for NSS / OpenSSL.

base/secure_hash_nss.cc

+// Copyright (c) 2006-2008 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 "base/secure_hash.h"
+
+#include "base/logging.h"
+#include "base/stl_util-inl.h"

[wtc, 2011/01/25 19:06:43]

Remove this header.

[bulach, 2011/01/25 20:33:41]

Done.

+#include "base/third_party/nss/blapi.h"
+#include "base/third_party/nss/sha256.h"
+
+namespace base {
+
+namespace {
+
+class SecureHashSHA256NSS : public SecureHash {
+ public:
+  SecureHashSHA256NSS() {
+    SHA256_Begin(&ctx_);
+  }
+
+  virtual ~SecureHashSHA256NSS() {
+  }
+
+  virtual void Update(const std::string& str) {
+    SHA256_Update(&ctx_, reinterpret_cast<const unsigned char*>(str.data()),
+                  static_cast<unsigned int>(str.length()));
+
+  }
+
+  virtual void Finish(void* output, size_t len) {
+    SHA256_End(&ctx_, static_cast<unsigned char*>(output), NULL,
+               static_cast<unsigned int>(len));
+  }
+
+ private:
+  ::SHA256Context ctx_;

[wtc, 2011/01/25 19:06:43]

Nit: you can remove :: now.

[bulach, 2011/01/25 20:33:41]

Done.

+};
+
+}  // namespace
+
+SecureHash* SecureHash::Create(Type type) {
+  if (type == TYPE_SHA256)
+    return new SecureHashSHA256NSS();
+  NOTIMPLEMENTED();
+  return NULL;

[wtc, 2011/01/25 19:06:43]

Please use a switch statement to make it easy to add new
hash algorithms in the future.

[bulach, 2011/01/25 20:33:41]

Done.

+}
+
+}  // namespace base