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rm sha1.cpp
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wangyu
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lib/sha1.cpp
345
lib/sha1.cpp
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/*
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* This file is adapted from PolarSSL 1.3.19 (GPL)
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*/
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/*
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* FIPS-180-1 compliant SHA-1 implementation
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*
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* Copyright (C) 2006-2014, ARM Limited, All Rights Reserved
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*
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* This file is part of mbed TLS (https://tls.mbed.org)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/*
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* The SHA-1 standard was published by NIST in 1993.
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*
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* http://www.itl.nist.gov/fipspubs/fip180-1.htm
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*/
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#include <string.h>
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#include <stddef.h>
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#include <stdint.h>
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typedef struct
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{
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uint32_t total[2]; /*!< number of bytes processed */
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uint32_t state[5]; /*!< intermediate digest state */
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unsigned char buffer[64]; /*!< data block being processed */
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}
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sha1_context;
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/* Implementation that should never be optimized out by the compiler */
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static void polarssl_zeroize( void *v, size_t n ) {
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volatile unsigned char *p = (unsigned char *) v; while( n-- ) *p++ = 0;
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}
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/*
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* 32-bit integer manipulation macros (big endian)
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*/
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#ifndef GET_UINT32_BE
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#define GET_UINT32_BE(n,b,i) \
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{ \
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(n) = ( (uint32_t) (b)[(i) ] << 24 ) \
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| ( (uint32_t) (b)[(i) + 1] << 16 ) \
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| ( (uint32_t) (b)[(i) + 2] << 8 ) \
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| ( (uint32_t) (b)[(i) + 3] ); \
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}
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#endif
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#ifndef PUT_UINT32_BE
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#define PUT_UINT32_BE(n,b,i) \
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{ \
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(b)[(i) ] = (unsigned char) ( (n) >> 24 ); \
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(b)[(i) + 1] = (unsigned char) ( (n) >> 16 ); \
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(b)[(i) + 2] = (unsigned char) ( (n) >> 8 ); \
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(b)[(i) + 3] = (unsigned char) ( (n) ); \
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}
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#endif
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void sha1_init( sha1_context *ctx )
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{
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memset( ctx, 0, sizeof( sha1_context ) );
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}
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void sha1_free( sha1_context *ctx )
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{
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if( ctx == NULL )
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return;
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polarssl_zeroize( ctx, sizeof( sha1_context ) );
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}
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/*
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* SHA-1 context setup
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*/
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void sha1_starts( sha1_context *ctx )
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{
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ctx->total[0] = 0;
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ctx->total[1] = 0;
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ctx->state[0] = 0x67452301;
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ctx->state[1] = 0xEFCDAB89;
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ctx->state[2] = 0x98BADCFE;
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ctx->state[3] = 0x10325476;
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ctx->state[4] = 0xC3D2E1F0;
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}
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void sha1_process( sha1_context *ctx, const unsigned char data[64] )
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{
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uint32_t temp, W[16], A, B, C, D, E;
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GET_UINT32_BE( W[ 0], data, 0 );
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GET_UINT32_BE( W[ 1], data, 4 );
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GET_UINT32_BE( W[ 2], data, 8 );
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GET_UINT32_BE( W[ 3], data, 12 );
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GET_UINT32_BE( W[ 4], data, 16 );
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GET_UINT32_BE( W[ 5], data, 20 );
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GET_UINT32_BE( W[ 6], data, 24 );
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GET_UINT32_BE( W[ 7], data, 28 );
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GET_UINT32_BE( W[ 8], data, 32 );
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GET_UINT32_BE( W[ 9], data, 36 );
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GET_UINT32_BE( W[10], data, 40 );
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GET_UINT32_BE( W[11], data, 44 );
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GET_UINT32_BE( W[12], data, 48 );
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GET_UINT32_BE( W[13], data, 52 );
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GET_UINT32_BE( W[14], data, 56 );
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GET_UINT32_BE( W[15], data, 60 );
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#define S(x,n) ((x << n) | ((x & 0xFFFFFFFF) >> (32 - n)))
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#define R(t) \
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( \
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temp = W[( t - 3 ) & 0x0F] ^ W[( t - 8 ) & 0x0F] ^ \
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W[( t - 14 ) & 0x0F] ^ W[ t & 0x0F], \
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( W[t & 0x0F] = S(temp,1) ) \
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)
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#define P(a,b,c,d,e,x) \
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{ \
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e += S(a,5) + F(b,c,d) + K + x; b = S(b,30); \
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}
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A = ctx->state[0];
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B = ctx->state[1];
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C = ctx->state[2];
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D = ctx->state[3];
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E = ctx->state[4];
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#define F(x,y,z) (z ^ (x & (y ^ z)))
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#define K 0x5A827999
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P( A, B, C, D, E, W[0] );
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P( E, A, B, C, D, W[1] );
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P( D, E, A, B, C, W[2] );
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P( C, D, E, A, B, W[3] );
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P( B, C, D, E, A, W[4] );
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P( A, B, C, D, E, W[5] );
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P( E, A, B, C, D, W[6] );
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P( D, E, A, B, C, W[7] );
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P( C, D, E, A, B, W[8] );
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P( B, C, D, E, A, W[9] );
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P( A, B, C, D, E, W[10] );
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P( E, A, B, C, D, W[11] );
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P( D, E, A, B, C, W[12] );
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P( C, D, E, A, B, W[13] );
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P( B, C, D, E, A, W[14] );
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P( A, B, C, D, E, W[15] );
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P( E, A, B, C, D, R(16) );
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P( D, E, A, B, C, R(17) );
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P( C, D, E, A, B, R(18) );
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P( B, C, D, E, A, R(19) );
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#undef K
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#undef F
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#define F(x,y,z) (x ^ y ^ z)
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#define K 0x6ED9EBA1
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P( A, B, C, D, E, R(20) );
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P( E, A, B, C, D, R(21) );
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P( D, E, A, B, C, R(22) );
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P( C, D, E, A, B, R(23) );
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P( B, C, D, E, A, R(24) );
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P( A, B, C, D, E, R(25) );
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P( E, A, B, C, D, R(26) );
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P( D, E, A, B, C, R(27) );
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P( C, D, E, A, B, R(28) );
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P( B, C, D, E, A, R(29) );
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P( A, B, C, D, E, R(30) );
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P( E, A, B, C, D, R(31) );
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P( D, E, A, B, C, R(32) );
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P( C, D, E, A, B, R(33) );
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P( B, C, D, E, A, R(34) );
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P( A, B, C, D, E, R(35) );
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P( E, A, B, C, D, R(36) );
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P( D, E, A, B, C, R(37) );
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P( C, D, E, A, B, R(38) );
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P( B, C, D, E, A, R(39) );
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#undef K
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#undef F
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#define F(x,y,z) ((x & y) | (z & (x | y)))
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#define K 0x8F1BBCDC
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P( A, B, C, D, E, R(40) );
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P( E, A, B, C, D, R(41) );
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P( D, E, A, B, C, R(42) );
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P( C, D, E, A, B, R(43) );
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P( B, C, D, E, A, R(44) );
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P( A, B, C, D, E, R(45) );
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P( E, A, B, C, D, R(46) );
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P( D, E, A, B, C, R(47) );
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P( C, D, E, A, B, R(48) );
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P( B, C, D, E, A, R(49) );
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P( A, B, C, D, E, R(50) );
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P( E, A, B, C, D, R(51) );
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P( D, E, A, B, C, R(52) );
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P( C, D, E, A, B, R(53) );
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P( B, C, D, E, A, R(54) );
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P( A, B, C, D, E, R(55) );
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P( E, A, B, C, D, R(56) );
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P( D, E, A, B, C, R(57) );
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P( C, D, E, A, B, R(58) );
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P( B, C, D, E, A, R(59) );
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#undef K
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#undef F
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#define F(x,y,z) (x ^ y ^ z)
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#define K 0xCA62C1D6
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P( A, B, C, D, E, R(60) );
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P( E, A, B, C, D, R(61) );
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P( D, E, A, B, C, R(62) );
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P( C, D, E, A, B, R(63) );
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P( B, C, D, E, A, R(64) );
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P( A, B, C, D, E, R(65) );
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P( E, A, B, C, D, R(66) );
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P( D, E, A, B, C, R(67) );
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P( C, D, E, A, B, R(68) );
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P( B, C, D, E, A, R(69) );
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P( A, B, C, D, E, R(70) );
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P( E, A, B, C, D, R(71) );
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P( D, E, A, B, C, R(72) );
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P( C, D, E, A, B, R(73) );
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P( B, C, D, E, A, R(74) );
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P( A, B, C, D, E, R(75) );
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P( E, A, B, C, D, R(76) );
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P( D, E, A, B, C, R(77) );
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P( C, D, E, A, B, R(78) );
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P( B, C, D, E, A, R(79) );
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#undef K
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#undef F
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ctx->state[0] += A;
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ctx->state[1] += B;
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ctx->state[2] += C;
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ctx->state[3] += D;
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ctx->state[4] += E;
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}
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/*
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* SHA-1 process buffer
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*/
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void sha1_update( sha1_context *ctx, const unsigned char *input, size_t ilen )
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{
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size_t fill;
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uint32_t left;
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if( ilen == 0 )
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return;
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left = ctx->total[0] & 0x3F;
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fill = 64 - left;
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ctx->total[0] += (uint32_t) ilen;
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ctx->total[0] &= 0xFFFFFFFF;
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if( ctx->total[0] < (uint32_t) ilen )
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ctx->total[1]++;
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if( left && ilen >= fill )
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{
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memcpy( (void *) (ctx->buffer + left), input, fill );
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sha1_process( ctx, ctx->buffer );
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input += fill;
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ilen -= fill;
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left = 0;
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}
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while( ilen >= 64 )
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{
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sha1_process( ctx, input );
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input += 64;
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ilen -= 64;
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}
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if( ilen > 0 )
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memcpy( (void *) (ctx->buffer + left), input, ilen );
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}
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static const unsigned char sha1_padding[64] =
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{
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0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
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};
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/*
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* SHA-1 final digest
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*/
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void sha1_finish( sha1_context *ctx, unsigned char output[20] )
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{
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uint32_t last, padn;
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uint32_t high, low;
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unsigned char msglen[8];
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high = ( ctx->total[0] >> 29 )
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| ( ctx->total[1] << 3 );
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low = ( ctx->total[0] << 3 );
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PUT_UINT32_BE( high, msglen, 0 );
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PUT_UINT32_BE( low, msglen, 4 );
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last = ctx->total[0] & 0x3F;
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padn = ( last < 56 ) ? ( 56 - last ) : ( 120 - last );
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sha1_update( ctx, sha1_padding, padn );
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sha1_update( ctx, msglen, 8 );
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PUT_UINT32_BE( ctx->state[0], output, 0 );
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PUT_UINT32_BE( ctx->state[1], output, 4 );
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PUT_UINT32_BE( ctx->state[2], output, 8 );
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PUT_UINT32_BE( ctx->state[3], output, 12 );
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PUT_UINT32_BE( ctx->state[4], output, 16 );
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}
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/*
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* output = SHA-1( input buffer )
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*/
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void sha1( const unsigned char *input, size_t ilen, unsigned char output[20] )
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{
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sha1_context ctx;
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sha1_init( &ctx );
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sha1_starts( &ctx );
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sha1_update( &ctx, input, ilen );
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sha1_finish( &ctx, output );
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sha1_free( &ctx );
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}
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