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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #include "crypto/random.h" | |
6 | |
7 #include <string> | |
8 | |
9 #if defined(OS_WIN) | |
10 #include "crypto/scoped_capi_types.h" | |
11 #endif // defined(OS_WIN) | |
wtc
2011/04/28 19:42:22
Nit: this block should be moved after line 14. Se
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12 | |
13 #include "base/base64.h" | |
14 #include "base/rand_util.h" | |
15 | |
16 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
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17 #if defined(OS_WIN) | |
wtc
2011/04/28 19:42:22
Optional: I would just eliminate the OS_WIN code.
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18 ScopedHCRYPTPROV safe_provider; | |
19 // Note: The only time NULL is safe to be passed as pszContainer is when | |
20 // dwFlags contains CRYPT_VERIFYCONTEXT, as all keys generated and/or used | |
21 // will be treated as ephemeral keys and not persisted. | |
22 BOOL ok = CryptAcquireContext(safe_provider.receive(), NULL, NULL, | |
23 PROV_RSA_AES, CRYPT_VERIFYCONTEXT); | |
Ryan Sleevi
2011/04/27 02:32:24
drive by: PROV_RSA_AES is only valid for XP SP2+.
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24 if (!ok) | |
25 return; | |
26 | |
27 CryptGenRandom(safe_provider, output_length, output); | |
Ryan Sleevi
2011/04/27 02:32:24
nit: I know the style guide recommends size_t for
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28 #else | |
29 uint64 random_int; | |
30 const char* random_int_bytes = reinterpret_cast<const char*>(&random_int); | |
31 size_t random_int_size = sizeof(random_int); | |
32 for (size_t i = 0; i < output_length; i += random_int_size) { | |
33 random_int = base::RandUint64(); | |
34 size_t copy_count = std::min(output_length - i, random_int_size); | |
35 memcpy(((uint8*)output) + i, random_int_bytes, copy_count); | |
36 } | |
37 #endif // defined(OS_WIN) | |
38 } | |
39 | |
40 std::string Generate128BitRandomBase64String() { | |
41 const int kNumberBytes = 128 / 8; | |
42 std::string random_bytes(kNumberBytes, ' '); | |
43 GetRandomBytes(&random_bytes[0], kNumberBytes); | |
44 std::string base64_encoded_bytes; | |
45 base::Base64Encode(random_bytes, &base64_encoded_bytes); | |
46 return base64_encoded_bytes; | |
47 } | |
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