Introduce SignatureCreator.

base/crypto/rsa_private_key.h

Index: base/crypto/rsa_private_key.h
diff --git a/base/crypto/rsa_private_key.h b/base/crypto/rsa_private_key.h
new file mode 100644
index 0000000000000000000000000000000000000000..21aa601df9ba82d0e7c0b509e33f870f761c76dc
--- /dev/null
+++ b/base/crypto/rsa_private_key.h
@@ -0,0 +1,66 @@
+// 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.
+
+#ifndef BASE_CRYPTO_RSA_PRIVATE_KEY_H_
+#define BASE_CRYPTO_RSA_PRIVATE_KEY_H_
+
+#include "build/build_config.h"
+
+#if defined(OS_WIN)
+#include <windows.h>
+#include <wincrypt.h>
+#else
+// TODO(port)
+#endif
+
+#include <vector>
+
+#include "base/basictypes.h"
+
+namespace base {
+
+// Encapsulates an RSA private key. Can be used to generate new keys, export
+// keys to other formats, or to extract a public key.
+class RSAPrivateKey {
+ public:
+  // Create a new random instance. Can return NULL if initialization fails.
+  static RSAPrivateKey* Create(uint16 num_bits);
+
+  // Create a new instance by importing an existing private key. The format is
+  // an ASN.1-encoded PrivateKeyInfo block from PKCS #8. This can return NULL if
+  // initialization fails.
+  static RSAPrivateKey* CreateFromPrivateKeyInfo(
+      const std::vector<uint8>& input);
+
+  ~RSAPrivateKey();
+
+#if defined(OS_WIN)
+  HCRYPTPROV provider() { return provider_; }
+  HCRYPTKEY key() { return key_; }
+#endif
+
+  // Exports the private key to a PKCS #1 PrivateKey block.
+  bool ExportPrivateKey(std::vector<uint8>* output);
+
+  // Exports the public key to an X509 SubjectPublicKeyInfo block.
+  bool ExportPublicKey(std::vector<uint8>* output);
+
+private:
+  // Constructor is private. Use Create() or CreateFromPrivateKeyInfo()
+  // instead.
+  RSAPrivateKey();
+
+#if defined(OS_WIN)
+  bool InitProvider();
+
+  HCRYPTPROV provider_;
+  HCRYPTKEY key_;
+#endif
+
+  DISALLOW_COPY_AND_ASSIGN(RSAPrivateKey);
+};
+
+}  // namespace base
+
+#endif  // BASE_CRYPTO_RSA_PRIVATE_KEY_H_