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64 lines
1.6 KiB
C++
64 lines
1.6 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* Simple class for computing SHA1. */
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#ifndef mozilla_SHA1_h
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#define mozilla_SHA1_h
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#include "mozilla/Types.h"
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#include <stddef.h>
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#include <stdint.h>
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namespace mozilla {
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/**
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* This class computes the SHA1 hash of a byte sequence, or of the concatenation
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* of multiple sequences. For example, computing the SHA1 of two sequences of
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* bytes could be done as follows:
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*
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* void SHA1(const uint8_t* buf1, uint32_t size1,
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* const uint8_t* buf2, uint32_t size2,
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* SHA1Sum::Hash& hash)
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* {
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* SHA1Sum s;
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* s.update(buf1, size1);
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* s.update(buf2, size2);
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* s.finish(hash);
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* }
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*
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* The finish method may only be called once and cannot be followed by calls
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* to update.
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*/
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class SHA1Sum
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{
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union
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{
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uint32_t mW[16]; /* input buffer */
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uint8_t mB[64];
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} mU;
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uint64_t mSize; /* count of hashed bytes. */
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unsigned mH[22]; /* 5 state variables, 16 tmp values, 1 extra */
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bool mDone;
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public:
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MFBT_API SHA1Sum();
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static const size_t kHashSize = 20;
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typedef uint8_t Hash[kHashSize];
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/* Add len bytes of dataIn to the data sequence being hashed. */
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MFBT_API void update(const void* aData, uint32_t aLength);
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/* Compute the final hash of all data into hashOut. */
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MFBT_API void finish(SHA1Sum::Hash& aHashOut);
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};
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} /* namespace mozilla */
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#endif /* mozilla_SHA1_h */
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