Index: crypto/random.cc |
diff --git a/crypto/random.cc b/crypto/random.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..2165399631826e3bf54b149367b40e15d4ce5879 |
--- /dev/null |
+++ b/crypto/random.cc |
@@ -0,0 +1,47 @@ |
+// 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/random.h" |
+ |
+#include <string> |
+ |
+#if defined(OS_WIN) |
+#include "crypto/scoped_capi_types.h" |
+#endif // defined(OS_WIN) |
wtc
2011/04/28 19:42:22
Nit: this block should be moved after line 14. Se
|
+ |
+#include "base/base64.h" |
+#include "base/rand_util.h" |
+ |
+void GetRandomBytes(void* output, size_t output_length) { |
Ryan Sleevi
2011/04/27 02:32:24
nit: Should the return be a bool instead?
Both Cr
|
+#if defined(OS_WIN) |
wtc
2011/04/28 19:42:22
Optional: I would just eliminate the OS_WIN code.
|
+ ScopedHCRYPTPROV safe_provider; |
+ // Note: The only time NULL is safe to be passed as pszContainer is when |
+ // dwFlags contains CRYPT_VERIFYCONTEXT, as all keys generated and/or used |
+ // will be treated as ephemeral keys and not persisted. |
+ BOOL ok = CryptAcquireContext(safe_provider.receive(), NULL, NULL, |
+ PROV_RSA_AES, CRYPT_VERIFYCONTEXT); |
Ryan Sleevi
2011/04/27 02:32:24
drive by: PROV_RSA_AES is only valid for XP SP2+.
|
+ if (!ok) |
+ return; |
+ |
+ CryptGenRandom(safe_provider, output_length, output); |
Ryan Sleevi
2011/04/27 02:32:24
nit: I know the style guide recommends size_t for
|
+#else |
+ uint64 random_int; |
+ const char* random_int_bytes = reinterpret_cast<const char*>(&random_int); |
+ size_t random_int_size = sizeof(random_int); |
+ for (size_t i = 0; i < output_length; i += random_int_size) { |
+ random_int = base::RandUint64(); |
+ size_t copy_count = std::min(output_length - i, random_int_size); |
+ memcpy(((uint8*)output) + i, random_int_bytes, copy_count); |
+ } |
+#endif // defined(OS_WIN) |
+} |
+ |
+std::string Generate128BitRandomBase64String() { |
+ const int kNumberBytes = 128 / 8; |
+ std::string random_bytes(kNumberBytes, ' '); |
+ GetRandomBytes(&random_bytes[0], kNumberBytes); |
+ std::string base64_encoded_bytes; |
+ base::Base64Encode(random_bytes, &base64_encoded_bytes); |
+ return base64_encoded_bytes; |
+} |