Initial version of tpm_init, a library for taking ownership of the TPM.

crypto.h

+// Copyright (c) 2009-2010 The Chromium OS Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Crypto - class for handling some OpenSSL crypto functions
+
+#ifndef TPM_INIT_CRYPTO_H_
+#define TPM_INIT_CRYPTO_H_
+
+#include <base/basictypes.h>
+#include <base/file_path.h>
+
+#include "secure_blob.h"
+
+namespace tpm_init {
+
+// Default entropy source is used to seed openssl's random number generator
+extern const std::string kDefaultEntropySource;
+
+class Crypto {
+ public:
+
+  // Default constructor, using the default entropy source
+  Crypto();
+
+  virtual ~Crypto();
+
+  // Initializes Crypto
+  bool Init();
+
+  // Seeds the random number generator
+  void SeedRng() const;
+
+  // Returns random bytes of the given length
+  //
+  // Parameters
+  //   rand (OUT) - Where to store the random bytes
+  //   length - The number of random bytes to store in rand
+  void GetSecureRandom(unsigned char *rand, int length) const;
+
+  // Creates a new RSA key
+  //
+  // Parameters
+  //   key_bits - The key size to generate
+  //   n (OUT) - the modulus
+  //   p (OUT) - the private key
+  bool CreateRsaKey(int key_bits, SecureBlob* n, SecureBlob *p) const;
+
+  // Gets the SHA1 hash of the data provided
+  void GetSha1(const chromeos::Blob& data, int start, int count,
+               SecureBlob* hash) const;
+
+  void AsciiEncodeToBuffer(const chromeos::Blob& blob, char* buffer,
+                           int buffer_length);
+
+ private:
+  std::string entropy_source_;
+
+  DISALLOW_COPY_AND_ASSIGN(Crypto);
+};
+
+}  // namespace tpm_init
+
+#endif  // TPM_INIT_CRYPTO_H_