SHA1.h (1687B)
1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ 2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */ 3 /* This Source Code Form is subject to the terms of the Mozilla Public 4 * License, v. 2.0. If a copy of the MPL was not distributed with this 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ 6 7 /* Simple class for computing SHA1. */ 8 9 #ifndef mozilla_SHA1_h 10 #define mozilla_SHA1_h 11 12 #include "mozilla/Types.h" 13 14 #include <stddef.h> 15 #include <stdint.h> 16 17 namespace mozilla { 18 19 /** 20 * This class computes the SHA1 hash of a byte sequence, or of the concatenation 21 * of multiple sequences. For example, computing the SHA1 of two sequences of 22 * bytes could be done as follows: 23 * 24 * void SHA1(const uint8_t* buf1, uint32_t size1, 25 * const uint8_t* buf2, uint32_t size2, 26 * SHA1Sum::Hash& hash) 27 * { 28 * SHA1Sum s; 29 * s.update(buf1, size1); 30 * s.update(buf2, size2); 31 * s.finish(hash); 32 * } 33 * 34 * The finish method may only be called once and cannot be followed by calls 35 * to update. 36 */ 37 class SHA1Sum { 38 union { 39 uint32_t mW[16]; /* input buffer */ 40 uint8_t mB[64]; 41 } mU; 42 uint64_t mSize; /* count of hashed bytes. */ 43 unsigned mH[22]; /* 5 state variables, 16 tmp values, 1 extra */ 44 bool mDone; 45 46 public: 47 MFBT_API SHA1Sum(); 48 49 static constexpr size_t kHashSize = 20; 50 typedef uint8_t Hash[kHashSize]; 51 52 /* Add len bytes of dataIn to the data sequence being hashed. */ 53 MFBT_API void update(const void* aData, uint32_t aLength); 54 55 /* Compute the final hash of all data into hashOut. */ 56 MFBT_API void finish(SHA1Sum::Hash& aHashOut); 57 }; 58 59 } /* namespace mozilla */ 60 61 #endif /* mozilla_SHA1_h */