1 files changed, 104 insertions, 0 deletions
diff --git a/crypto/symmetric_key_openssl.cc b/crypto/symmetric_key_openssl.cc
new file mode 100644
index 0000000000..e268a1d0f9
--- /dev/null
+++ b/crypto/symmetric_key_openssl.cc
@@ -0,0 +1,104 @@
+// Copyright (c) 2011 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 "crypto/symmetric_key.h"
+
+#include <openssl/evp.h>
+#include <openssl/rand.h>
+
+#include <algorithm>
+
+#include "base/logging.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/strings/string_util.h"
+#include "crypto/openssl_util.h"
+
+namespace crypto {
+
+SymmetricKey::~SymmetricKey() {
+  std::fill(key_.begin(), key_.end(), '\0');  // Zero out the confidential key.
+}
+
+// static
+SymmetricKey* SymmetricKey::GenerateRandomKey(Algorithm algorithm,
+                                              size_t key_size_in_bits) {
+  DCHECK_EQ(AES, algorithm);
+
+  // Whitelist supported key sizes to avoid accidentaly relying on
+  // algorithms available in NSS but not BoringSSL and vice
+  // versa. Note that BoringSSL does not support AES-192.
+  if (key_size_in_bits != 128 && key_size_in_bits != 256)
+    return NULL;
+
+  size_t key_size_in_bytes = key_size_in_bits / 8;
+  DCHECK_EQ(key_size_in_bits, key_size_in_bytes * 8);
+
+  if (key_size_in_bytes == 0)
+    return NULL;
+
+  OpenSSLErrStackTracer err_tracer(FROM_HERE);
+  scoped_ptr<SymmetricKey> key(new SymmetricKey);
+  uint8* key_data =
+      reinterpret_cast<uint8*>(WriteInto(&key->key_, key_size_in_bytes + 1));
+
+  int rv = RAND_bytes(key_data, static_cast<int>(key_size_in_bytes));
+  return rv == 1 ? key.release() : NULL;
+}
+
+// static
+SymmetricKey* SymmetricKey::DeriveKeyFromPassword(Algorithm algorithm,
+                                                  const std::string& password,
+                                                  const std::string& salt,
+                                                  size_t iterations,
+                                                  size_t key_size_in_bits) {
+  DCHECK(algorithm == AES || algorithm == HMAC_SHA1);
+
+  if (algorithm == AES) {
+    // Whitelist supported key sizes to avoid accidentaly relying on
+    // algorithms available in NSS but not BoringSSL and vice
+    // versa. Note that BoringSSL does not support AES-192.
+    if (key_size_in_bits != 128 && key_size_in_bits != 256)
+      return NULL;
+  }
+
+  size_t key_size_in_bytes = key_size_in_bits / 8;
+  DCHECK_EQ(key_size_in_bits, key_size_in_bytes * 8);
+
+  if (key_size_in_bytes == 0)
+    return NULL;
+
+  OpenSSLErrStackTracer err_tracer(FROM_HERE);
+  scoped_ptr<SymmetricKey> key(new SymmetricKey);
+  uint8* key_data =
+      reinterpret_cast<uint8*>(WriteInto(&key->key_, key_size_in_bytes + 1));
+  int rv = PKCS5_PBKDF2_HMAC_SHA1(password.data(), password.length(),
+                                  reinterpret_cast<const uint8*>(salt.data()),
+                                  salt.length(), iterations,
+                                  static_cast<int>(key_size_in_bytes),
+                                  key_data);
+  return rv == 1 ? key.release() : NULL;
+}
+
+// static
+SymmetricKey* SymmetricKey::Import(Algorithm algorithm,
+                                   const std::string& raw_key) {
+  if (algorithm == AES) {
+    // Whitelist supported key sizes to avoid accidentaly relying on
+    // algorithms available in NSS but not BoringSSL and vice
+    // versa. Note that BoringSSL does not support AES-192.
+    if (raw_key.size() != 128/8 && raw_key.size() != 256/8)
+      return NULL;
+  }
+
+  scoped_ptr<SymmetricKey> key(new SymmetricKey);
+  key->key_ = raw_key;
+  return key.release();
+}
+
+bool SymmetricKey::GetRawKey(std::string* raw_key) {
+  *raw_key = key_;
+  return true;
+}
+
+}  // namespace crypto