Reland "Cut down /crypto and switch what is left of it to boringssl".

crypto/hmac.cc

-// 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/hmac.h"
-
-#include <algorithm>
-
-#include "base/logging.h"
-#include "crypto/secure_util.h"
-#include "crypto/symmetric_key.h"
-
-namespace crypto {
-
-bool HMAC::Init(SymmetricKey* key) {
-  std::string raw_key;
-  bool result = key->GetRawKey(&raw_key) && Init(raw_key);
-  // Zero out key copy.  This might get optimized away, but one can hope.
-  // Using std::string to store key info at all is a larger problem.
-  std::fill(raw_key.begin(), raw_key.end(), 0);
-  return result;
-}
-
-size_t HMAC::DigestLength() const {
-  switch (hash_alg_) {
-    case SHA1:
-      return 20;
-    case SHA256:
-      return 32;
-    default:
-      NOTREACHED();
-      return 0;
-  }
-}
-
-bool HMAC::Verify(const base::StringPiece& data,
-                  const base::StringPiece& digest) const {
-  if (digest.size() != DigestLength())
-    return false;
-  return VerifyTruncated(data, digest);
-}
-
-bool HMAC::VerifyTruncated(const base::StringPiece& data,
-                           const base::StringPiece& digest) const {
-  if (digest.empty())
-    return false;
-  size_t digest_length = DigestLength();
-  scoped_ptr<unsigned char[]> computed_digest(
-      new unsigned char[digest_length]);
-  if (!Sign(data, computed_digest.get(), digest_length))
-    return false;
-
-  return SecureMemEqual(digest.data(), computed_digest.get(),
-                        std::min(digest.size(), digest_length));
-}
-
-}  // namespace crypto