1 // Copyright (c) 2012 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 #ifndef CRYPTO_SHA2_H_
6 #define CRYPTO_SHA2_H_
7 
8 #include <stddef.h>
9 
10 #include <string>
11 
12 #include "base/strings/string_piece.h"
13 #include "crypto/crypto_export.h"
14 
15 namespace crypto {
16 
17 // These functions perform SHA-256 operations.
18 //
19 // Functions for SHA-384 and SHA-512 can be added when the need arises.
20 
21 static const size_t kSHA256Length = 32;  // Length in bytes of a SHA-256 hash.
22 
23 // Computes the SHA-256 hash of the input string 'str' and stores the first
24 // 'len' bytes of the hash in the output buffer 'output'.  If 'len' > 32,
25 // only 32 bytes (the full hash) are stored in the 'output' buffer.
26 CRYPTO_EXPORT void SHA256HashString(const base::StringPiece& str,
27                                     void* output, size_t len);
28 
29 // Convenience version of the above that returns the result in a 32-byte
30 // string.
31 CRYPTO_EXPORT std::string SHA256HashString(const base::StringPiece& str);
32 
33 }  // namespace crypto
34 
35 #endif  // CRYPTO_SHA2_H_
36