gfx/skia/trunk/src/utils/SkSHA1.h@6474c204b198 (annotated)
gfx/skia/trunk/src/utils/SkSHA1.h
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /* |
| michael@0 | 2 | * Copyright 2013 Google Inc. |
| michael@0 | 3 | * |
| michael@0 | 4 | * Use of this source code is governed by a BSD-style license that can be |
| michael@0 | 5 | * found in the LICENSE file. |
| michael@0 | 6 | */ |
| michael@0 | 7 | |
| michael@0 | 8 | #ifndef SkSHA1_DEFINED |
| michael@0 | 9 | #define SkSHA1_DEFINED |
| michael@0 | 10 | |
| michael@0 | 11 | #include "SkTypes.h" |
| michael@0 | 12 | #include "SkEndian.h" |
| michael@0 | 13 | #include "SkStream.h" |
| michael@0 | 14 | |
| michael@0 | 15 | //The following macros can be defined to affect the SHA1 code generated. |
| michael@0 | 16 | //SK_SHA1_CLEAR_DATA causes all intermediate state to be overwritten with 0's. |
| michael@0 | 17 | //SK_CPU_BENDIAN allows 32 bit <=> 8 bit conversions without copies (if alligned). |
| michael@0 | 18 | //SK_CPU_FAST_UNALIGNED_ACCESS allows 32 bit <=> 8 bit conversions without copies if SK_CPU_BENDIAN. |
| michael@0 | 19 | |
| michael@0 | 20 | class SkSHA1 : public SkWStream { |
| michael@0 | 21 | public: |
| michael@0 | 22 | SkSHA1(); |
| michael@0 | 23 | |
| michael@0 | 24 | /** Processes input, adding it to the digest. |
| michael@0 | 25 | * Note that this treats the buffer as a series of uint8_t values. |
| michael@0 | 26 | */ |
| michael@0 | 27 | virtual bool write(const void* buffer, size_t size) SK_OVERRIDE { |
| michael@0 | 28 | update(reinterpret_cast<const uint8_t*>(buffer), size); |
| michael@0 | 29 | return true; |
| michael@0 | 30 | } |
| michael@0 | 31 | |
| michael@0 | 32 | virtual size_t bytesWritten() const SK_OVERRIDE { return SkToSizeT(this->byteCount); } |
| michael@0 | 33 | |
| michael@0 | 34 | /** Processes input, adding it to the digest. Calling this after finish is undefined. */ |
| michael@0 | 35 | void update(const uint8_t* input, size_t length); |
| michael@0 | 36 | |
| michael@0 | 37 | struct Digest { |
| michael@0 | 38 | uint8_t data[20]; |
| michael@0 | 39 | }; |
| michael@0 | 40 | |
| michael@0 | 41 | /** Computes and returns the digest. */ |
| michael@0 | 42 | void finish(Digest& digest); |
| michael@0 | 43 | |
| michael@0 | 44 | private: |
| michael@0 | 45 | // number of bytes, modulo 2^64 |
| michael@0 | 46 | uint64_t byteCount; |
| michael@0 | 47 | |
| michael@0 | 48 | // state (ABCDE) |
| michael@0 | 49 | uint32_t state[5]; |
| michael@0 | 50 | |
| michael@0 | 51 | // input buffer |
| michael@0 | 52 | uint8_t buffer[64]; |
| michael@0 | 53 | }; |
| michael@0 | 54 | |
| michael@0 | 55 | #endif |
