Add base to the repository.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@8 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 121 insertions, 0 deletions

diff --git a/base/hmac.cc b/base/hmac.cc
new file mode 100644
index 0000000..ee86ebd
--- /dev/null
+++ b/base/hmac.cc
@@ -0,0 +1,121 @@
+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#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;
+}