forked from 0ad/0ad
267 lines
7.8 KiB
C++
267 lines
7.8 KiB
C++
/**
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* FIPS-180-2 compliant SHA-256 implementation
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*
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* Copyright (C) 2001-2003 Christophe Devine
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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
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "precompiled.h"
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#include "sha.h"
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#define GET_uint32(n,b,i) \
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{ \
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(n) = ( (unsigned int) (b)[(i) ] << 24 ) \
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| ( (unsigned int) (b)[(i) + 1] << 16 ) \
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| ( (unsigned int) (b)[(i) + 2] << 8 ) \
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| ( (unsigned int) (b)[(i) + 3] ); \
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}
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#define PUT_uint32(n,b,i) \
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{ \
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(b)[(i) ] = (unsigned char) ( ((n) >> 24) & 0xFF ); \
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(b)[(i) + 1] = (unsigned char) ( ((n) >> 16) & 0xFF ); \
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(b)[(i) + 2] = (unsigned char) ( ((n) >> 8) & 0xFF ); \
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(b)[(i) + 3] = (unsigned char) ( ((n) ) & 0xFF ); \
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}
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SHA256::SHA256()
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{
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init();
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}
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void SHA256::init()
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{
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total[0] = 0;
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total[1] = 0;
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state[0] = 0x6A09E667;
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state[1] = 0xBB67AE85;
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state[2] = 0x3C6EF372;
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state[3] = 0xA54FF53A;
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state[4] = 0x510E527F;
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state[5] = 0x9B05688C;
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state[6] = 0x1F83D9AB;
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state[7] = 0x5BE0CD19;
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}
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void SHA256::transform(unsigned char (&data)[64])
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{
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unsigned int temp1, temp2, W[64];
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unsigned int A, B, C, D, E, F, G, H;
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GET_uint32( W[0], data, 0 );
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GET_uint32( W[1], data, 4 );
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GET_uint32( W[2], data, 8 );
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GET_uint32( W[3], data, 12 );
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GET_uint32( W[4], data, 16 );
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GET_uint32( W[5], data, 20 );
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GET_uint32( W[6], data, 24 );
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GET_uint32( W[7], data, 28 );
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GET_uint32( W[8], data, 32 );
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GET_uint32( W[9], data, 36 );
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GET_uint32( W[10], data, 40 );
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GET_uint32( W[11], data, 44 );
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GET_uint32( W[12], data, 48 );
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GET_uint32( W[13], data, 52 );
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GET_uint32( W[14], data, 56 );
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GET_uint32( W[15], data, 60 );
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#define SHR(x,n) ((x & 0xFFFFFFFF) >> n)
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#define ROTR(x,n) (SHR(x,n) | (x << (32 - n)))
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#define S0(x) (ROTR(x, 7) ^ ROTR(x,18) ^ SHR(x, 3))
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#define S1(x) (ROTR(x,17) ^ ROTR(x,19) ^ SHR(x,10))
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#define S2(x) (ROTR(x, 2) ^ ROTR(x,13) ^ ROTR(x,22))
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#define S3(x) (ROTR(x, 6) ^ ROTR(x,11) ^ ROTR(x,25))
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#define F0(x,y,z) ((x & y) | (z & (x | y)))
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#define F1(x,y,z) (z ^ (x & (y ^ z)))
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#define R(t) \
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( \
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W[t] = S1(W[t - 2]) + W[t - 7] + \
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S0(W[t - 15]) + W[t - 16] \
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)
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#define P(a,b,c,d,e,f,g,h,x,K) \
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{ \
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temp1 = h + S3(e) + F1(e,f,g) + K + x; \
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temp2 = S2(a) + F0(a,b,c); \
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d += temp1; h = temp1 + temp2; \
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}
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A = state[0];
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B = state[1];
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C = state[2];
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D = state[3];
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E = state[4];
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F = state[5];
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G = state[6];
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H = state[7];
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P( A, B, C, D, E, F, G, H, W[ 0], 0x428A2F98 );
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P( H, A, B, C, D, E, F, G, W[ 1], 0x71374491 );
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P( G, H, A, B, C, D, E, F, W[ 2], 0xB5C0FBCF );
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P( F, G, H, A, B, C, D, E, W[ 3], 0xE9B5DBA5 );
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P( E, F, G, H, A, B, C, D, W[ 4], 0x3956C25B );
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P( D, E, F, G, H, A, B, C, W[ 5], 0x59F111F1 );
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P( C, D, E, F, G, H, A, B, W[ 6], 0x923F82A4 );
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P( B, C, D, E, F, G, H, A, W[ 7], 0xAB1C5ED5 );
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P( A, B, C, D, E, F, G, H, W[ 8], 0xD807AA98 );
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P( H, A, B, C, D, E, F, G, W[ 9], 0x12835B01 );
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P( G, H, A, B, C, D, E, F, W[10], 0x243185BE );
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P( F, G, H, A, B, C, D, E, W[11], 0x550C7DC3 );
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P( E, F, G, H, A, B, C, D, W[12], 0x72BE5D74 );
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P( D, E, F, G, H, A, B, C, W[13], 0x80DEB1FE );
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P( C, D, E, F, G, H, A, B, W[14], 0x9BDC06A7 );
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P( B, C, D, E, F, G, H, A, W[15], 0xC19BF174 );
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P( A, B, C, D, E, F, G, H, R(16), 0xE49B69C1 );
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P( H, A, B, C, D, E, F, G, R(17), 0xEFBE4786 );
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P( G, H, A, B, C, D, E, F, R(18), 0x0FC19DC6 );
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P( F, G, H, A, B, C, D, E, R(19), 0x240CA1CC );
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P( E, F, G, H, A, B, C, D, R(20), 0x2DE92C6F );
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P( D, E, F, G, H, A, B, C, R(21), 0x4A7484AA );
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P( C, D, E, F, G, H, A, B, R(22), 0x5CB0A9DC );
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P( B, C, D, E, F, G, H, A, R(23), 0x76F988DA );
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P( A, B, C, D, E, F, G, H, R(24), 0x983E5152 );
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P( H, A, B, C, D, E, F, G, R(25), 0xA831C66D );
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P( G, H, A, B, C, D, E, F, R(26), 0xB00327C8 );
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P( F, G, H, A, B, C, D, E, R(27), 0xBF597FC7 );
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P( E, F, G, H, A, B, C, D, R(28), 0xC6E00BF3 );
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P( D, E, F, G, H, A, B, C, R(29), 0xD5A79147 );
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P( C, D, E, F, G, H, A, B, R(30), 0x06CA6351 );
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P( B, C, D, E, F, G, H, A, R(31), 0x14292967 );
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P( A, B, C, D, E, F, G, H, R(32), 0x27B70A85 );
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P( H, A, B, C, D, E, F, G, R(33), 0x2E1B2138 );
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P( G, H, A, B, C, D, E, F, R(34), 0x4D2C6DFC );
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P( F, G, H, A, B, C, D, E, R(35), 0x53380D13 );
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P( E, F, G, H, A, B, C, D, R(36), 0x650A7354 );
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P( D, E, F, G, H, A, B, C, R(37), 0x766A0ABB );
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P( C, D, E, F, G, H, A, B, R(38), 0x81C2C92E );
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P( B, C, D, E, F, G, H, A, R(39), 0x92722C85 );
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P( A, B, C, D, E, F, G, H, R(40), 0xA2BFE8A1 );
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P( H, A, B, C, D, E, F, G, R(41), 0xA81A664B );
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P( G, H, A, B, C, D, E, F, R(42), 0xC24B8B70 );
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P( F, G, H, A, B, C, D, E, R(43), 0xC76C51A3 );
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P( E, F, G, H, A, B, C, D, R(44), 0xD192E819 );
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P( D, E, F, G, H, A, B, C, R(45), 0xD6990624 );
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P( C, D, E, F, G, H, A, B, R(46), 0xF40E3585 );
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P( B, C, D, E, F, G, H, A, R(47), 0x106AA070 );
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P( A, B, C, D, E, F, G, H, R(48), 0x19A4C116 );
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P( H, A, B, C, D, E, F, G, R(49), 0x1E376C08 );
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P( G, H, A, B, C, D, E, F, R(50), 0x2748774C );
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P( F, G, H, A, B, C, D, E, R(51), 0x34B0BCB5 );
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P( E, F, G, H, A, B, C, D, R(52), 0x391C0CB3 );
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P( D, E, F, G, H, A, B, C, R(53), 0x4ED8AA4A );
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P( C, D, E, F, G, H, A, B, R(54), 0x5B9CCA4F );
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P( B, C, D, E, F, G, H, A, R(55), 0x682E6FF3 );
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P( A, B, C, D, E, F, G, H, R(56), 0x748F82EE );
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P( H, A, B, C, D, E, F, G, R(57), 0x78A5636F );
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P( G, H, A, B, C, D, E, F, R(58), 0x84C87814 );
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P( F, G, H, A, B, C, D, E, R(59), 0x8CC70208 );
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P( E, F, G, H, A, B, C, D, R(60), 0x90BEFFFA );
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P( D, E, F, G, H, A, B, C, R(61), 0xA4506CEB );
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P( C, D, E, F, G, H, A, B, R(62), 0xBEF9A3F7 );
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P( B, C, D, E, F, G, H, A, R(63), 0xC67178F2 );
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state[0] += A;
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state[1] += B;
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state[2] += C;
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state[3] += D;
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state[4] += E;
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state[5] += F;
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state[6] += G;
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state[7] += H;
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}
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void SHA256::update(const void* input, unsigned int length )
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{
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unsigned int left, fill;
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if( ! length ) return;
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left = total[0] & 0x3F;
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fill = 64 - left;
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total[0] += length;
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total[0] &= 0xFFFFFFFF;
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if( total[0] < length )
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total[1]++;
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if( left && length >= fill )
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{
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memcpy( (void *) (buffer + left),
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(void *) input, fill );
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transform(buffer);
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length -= fill;
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input = (unsigned char*)input + fill;
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left = 0;
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}
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while( length >= 64 )
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{
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transform((unsigned char(&)[64])input);
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length -= 64;
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input = (unsigned char*)input + 64;
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}
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if( length )
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{
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memcpy( (void *) (buffer + left),
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(void *) input, length );
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}
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}
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static unsigned char sha256_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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void SHA256::finish(unsigned char (&digest)[32] )
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{
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unsigned int last, padn;
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unsigned int high, low;
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unsigned char msglen[8];
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high = ( total[0] >> 29 )
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| ( total[1] << 3 );
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low = ( total[0] << 3 );
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PUT_uint32( high, msglen, 0 );
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PUT_uint32( low, msglen, 4 );
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last = total[0] & 0x3F;
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padn = ( last < 56 ) ? ( 56 - last ) : ( 120 - last );
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update(sha256_padding, padn);
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update(msglen, 8);
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PUT_uint32( state[0], digest, 0 );
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PUT_uint32( state[1], digest, 4 );
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PUT_uint32( state[2], digest, 8 );
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PUT_uint32( state[3], digest, 12 );
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PUT_uint32( state[4], digest, 16 );
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PUT_uint32( state[5], digest, 20 );
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PUT_uint32( state[6], digest, 24 );
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PUT_uint32( state[7], digest, 28 );
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}
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