HMAC-SHA1 implementation for Mac based on CommonCrypto

base/hmac.cc

Index: base/hmac.cc
===================================================================
--- base/hmac.cc	(revision 1712)
+++ base/hmac.cc	(working copy)
@@ -1,97 +0,0 @@
-// 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/hmac.h"
-#include "base/logging.h"
-
-HMAC::HMAC(HashAlgorithm hash_alg, const unsigned char* key, int key_length)
-    : hash_alg_(hash_alg),
-      provider_(NULL),
-      hash_(NULL),
-      hkey_(NULL) {
-  if (!CryptAcquireContext(&provider_, NULL, NULL,
-                           PROV_RSA_FULL, CRYPT_VERIFYCONTEXT))
-    provider_ = NULL;
-  ImportKey(key, key_length);
-}
-
-HMAC::~HMAC() {
-  if (hkey_)
-    CryptDestroyKey(hkey_);
-  if (hash_)
-    CryptDestroyHash(hash_);
-  if (provider_)
-    CryptReleaseContext(provider_, 0);
-}
-
-bool HMAC::Sign(const std::string& data,
-                unsigned char* digest,
-                int digest_length) {
-  if (!provider_ || !hkey_)
-    return false;
-
-  switch (hash_alg_) {
-    case SHA1:
-      return SignWithSHA1(data, digest, digest_length);
-    default:
-      NOTREACHED();
-      return false;
-  }
-}
-
-void HMAC::ImportKey(const unsigned char* key, int key_length) {
-  if (key_length > kMaxKeySize) {
-    NOTREACHED();
-    return;
-  }
-
-  struct {
-    BLOBHEADER header;
-    DWORD key_size;
-    BYTE key_data[kMaxKeySize];
-  } key_blob;
-  key_blob.header.bType = PLAINTEXTKEYBLOB;
-  key_blob.header.bVersion = CUR_BLOB_VERSION;
-  key_blob.header.reserved = 0;
-  key_blob.header.aiKeyAlg = CALG_RC2;
-  key_blob.key_size = key_length;
-  memcpy(key_blob.key_data, key, key_length);
-
-  if (!CryptImportKey(provider_,
-                      reinterpret_cast<const BYTE *>(&key_blob),
-                      sizeof(key_blob), 0, 0, &hkey_))
-    hkey_ = NULL;
-
-  // Destroy the copy of the key.
-  SecureZeroMemory(key_blob.key_data, key_length);
-}
-
-bool HMAC::SignWithSHA1(const std::string& data,
-                        unsigned char* digest,
-                        int digest_length) {
-  DCHECK(provider_);
-  DCHECK(hkey_);
-
-  if (!CryptCreateHash(provider_, CALG_HMAC, hkey_, 0, &hash_))
-    return false;
-
-  HMAC_INFO hmac_info;
-  memset(&hmac_info, 0, sizeof(hmac_info));
-  hmac_info.HashAlgid = CALG_SHA1;
-  if (!CryptSetHashParam(hash_, HP_HMAC_INFO,
-                         reinterpret_cast<BYTE*>(&hmac_info), 0))
-    return false;
-
-  if (!CryptHashData(hash_,
-                     reinterpret_cast<const BYTE*>(data.data()),
-                     static_cast<DWORD>(data.size()), 0))
-    return false;
-
-  DWORD sha1_size = digest_length;
-  if (!CryptGetHashParam(hash_, HP_HASHVAL, digest, &sha1_size, 0))
-    return false;
-
-  return true;
-}
-