michael@0: /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* vim: set ts=8 sts=2 et sw=2 tw=80: */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: /* Simple class for computing SHA1. */
michael@0: 
michael@0: #ifndef mozilla_SHA1_h
michael@0: #define mozilla_SHA1_h
michael@0: 
michael@0: #include "mozilla/Types.h"
michael@0: 
michael@0: #include <stddef.h>
michael@0: #include <stdint.h>
michael@0: 
michael@0: namespace mozilla {
michael@0: 
michael@0: /**
michael@0:  * This class computes the SHA1 hash of a byte sequence, or of the concatenation
michael@0:  * of multiple sequences.  For example, computing the SHA1 of two sequences of
michael@0:  * bytes could be done as follows:
michael@0:  *
michael@0:  *   void SHA1(const uint8_t* buf1, uint32_t size1,
michael@0:  *             const uint8_t* buf2, uint32_t size2,
michael@0:  *             SHA1Sum::Hash& hash)
michael@0:  *   {
michael@0:  *     SHA1Sum s;
michael@0:  *     s.update(buf1, size1);
michael@0:  *     s.update(buf2, size2);
michael@0:  *     s.finish(hash);
michael@0:  *   }
michael@0:  *
michael@0:  * The finish method may only be called once and cannot be followed by calls
michael@0:  * to update.
michael@0:  */
michael@0: class SHA1Sum
michael@0: {
michael@0:     union {
michael@0:         uint32_t w[16]; /* input buffer */
michael@0:         uint8_t b[64];
michael@0:     } u;
michael@0:     uint64_t size; /* count of hashed bytes. */
michael@0:     unsigned H[22]; /* 5 state variables, 16 tmp values, 1 extra */
michael@0:     bool mDone;
michael@0: 
michael@0:   public:
michael@0:     MFBT_API SHA1Sum();
michael@0: 
michael@0:     static const size_t HashSize = 20;
michael@0:     typedef uint8_t Hash[HashSize];
michael@0: 
michael@0:     /* Add len bytes of dataIn to the data sequence being hashed. */
michael@0:     MFBT_API void update(const void* dataIn, uint32_t len);
michael@0: 
michael@0:     /* Compute the final hash of all data into hashOut. */
michael@0:     MFBT_API void finish(SHA1Sum::Hash& hashOut);
michael@0: };
michael@0: 
michael@0: } /* namespace mozilla */
michael@0: 
michael@0: #endif /* mozilla_SHA1_h */