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1 /* | |
2 * Copyright 2013 Google Inc. | |
3 * | |
4 * Use of this source code is governed by a BSD-style license that can be | |
5 * found in the LICENSE file. | |
6 */ | |
7 | |
8 #ifndef SkSHA1_DEFINED | |
9 #define SkSHA1_DEFINED | |
10 | |
11 #include "SkTypes.h" | |
12 #include "SkEndian.h" | |
13 #include "SkStream.h" | |
14 | |
15 //The following macros can be defined to affect the SHA1 code generated. | |
16 //SK_SHA1_CLEAR_DATA causes all intermediate state to be overwritten with 0's. | |
17 //SK_CPU_BENDIAN allows 32 bit <=> 8 bit conversions without copies (if alligned
). | |
18 //SK_CPU_FAST_UNALIGNED_ACCESS allows 32 bit <=> 8 bit conversions without copie
s if SK_CPU_BENDIAN. | |
19 | |
20 class SkSHA1 : public SkWStream { | |
21 public: | |
22 SkSHA1(); | |
23 | |
24 /** Processes input, adding it to the digest. | |
25 * Note that this treats the buffer as a series of uint8_t values. | |
26 */ | |
27 bool write(const void* buffer, size_t size) override { | |
28 update(reinterpret_cast<const uint8_t*>(buffer), size); | |
29 return true; | |
30 } | |
31 | |
32 size_t bytesWritten() const override { return SkToSizeT(this->byteCount); } | |
33 | |
34 /** Processes input, adding it to the digest. Calling this after finish is u
ndefined. */ | |
35 void update(const uint8_t* input, size_t length); | |
36 | |
37 struct Digest { | |
38 uint8_t data[20]; | |
39 }; | |
40 | |
41 /** Computes and returns the digest. */ | |
42 void finish(Digest& digest); | |
43 | |
44 private: | |
45 // number of bytes, modulo 2^64 | |
46 uint64_t byteCount; | |
47 | |
48 // state (ABCDE) | |
49 uint32_t state[5]; | |
50 | |
51 // input buffer | |
52 uint8_t buffer[64]; | |
53 }; | |
54 | |
55 #endif | |
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