Introduce SignatureCreator.

base/crypto/signature_creator_win.cc

+// Copyright (c) 2009 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/crypto/signature_creator.h"
+
+#include "base/logging.h"
+#include "base/scoped_ptr.h"
+
+namespace base {
+
+// static
+SignatureCreator* SignatureCreator::Create(RSAPrivateKey* key) {
+  scoped_ptr<SignatureCreator> result(new SignatureCreator);
+  result->key_ = key;
+
+  if (!CryptCreateHash(key->provider(), CALG_SHA1, 0, 0,
+                       &result->hash_object_)) {
+    NOTREACHED();
+    return NULL;
+  }
+
+  return result.release();
+}
+
+SignatureCreator::~SignatureCreator() {
+  if (hash_object_) {
+    if (!CryptDestroyHash(hash_object_))
+      NOTREACHED();
+
+    hash_object_ = 0;
+  }
+}
+
+bool SignatureCreator::Update(const uint8* data_part, int data_part_len) {
+  if (!CryptHashData(hash_object_, data_part, data_part_len, 0)) {
+    NOTREACHED();
+    return false;
+  }
+
+  return true;
+}
+
+bool SignatureCreator::Final(std::vector<uint8>* signature) {
+  DWORD signature_length = 0;
+  if (!CryptSignHash(hash_object_, AT_SIGNATURE, NULL, 0, NULL,
+                     &signature_length)) {
+    return false;
+  }
+
+  signature->resize(signature_length);
+  if (!CryptSignHash(hash_object_, AT_SIGNATURE, NULL, 0, &signature->front(),
+                     &signature_length)) {
+    return false;
+  }
+
+  signature->resize(signature_length);
+  hash_object_ = 0;
+  return true;
+}
+
+}  // namespace base