1 // Copyright 2012 The Chromium OS 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 #ifndef LIBWEAVE_THIRD_PARTY_CHROMIUM_SHA2_H_
6 #define LIBWEAVE_THIRD_PARTY_CHROMIUM_SHA2_H_
7 
8 #include <string>
9 
10 namespace crypto {
11 
12 // These functions perform SHA-256 operations.
13 //
14 // Functions for SHA-384 and SHA-512 can be added when the need arises.
15 
16 static const size_t kSHA256Length = 32;  // Length in bytes of a SHA-256 hash.
17 
18 // Computes the SHA-256 hash of the input string 'str' and stores the first
19 // 'len' bytes of the hash in the output buffer 'output'.  If 'len' > 32,
20 // only 32 bytes (the full hash) are stored in the 'output' buffer.
21 void SHA256HashString(const std::string& str, uint8_t* output, size_t len);
22 
23 // Convenience version of the above that returns the result in a 32-byte
24 // string.
25 std::string SHA256HashString(const std::string& str);
26 
27 }  // namespace crypto
28 
29 #endif  // LIBWEAVE_THIRD_PARTY_CHROMIUM_SHA2_H_
30