507 lines
15 KiB
C
507 lines
15 KiB
C
/*
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* FIPS-180-2 compliant SHA-256 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-256 Secure Hash Standard was published by NIST in 2002.
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*
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* http://csrc.nist.gov/publications/fips/fips180-2/fips180-2.pdf
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*/
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#if !defined(POLARSSL_CONFIG_FILE)
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#include "mbedtls/config.h"
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#else
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#include POLARSSL_CONFIG_FILE
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#endif
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#if defined(POLARSSL_SHA256_C)
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#include "mbedtls/sha256.h"
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#include <string.h>
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#if defined(POLARSSL_FS_IO)
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#include <stdio.h>
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#endif
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#if defined(POLARSSL_SELF_TEST)
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#if defined(POLARSSL_PLATFORM_C)
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#include "mbedtls/platform.h"
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#else
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#include <stdio.h>
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#define polarssl_printf printf
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#endif /* POLARSSL_PLATFORM_C */
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#endif /* POLARSSL_SELF_TEST */
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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 = v; while( n-- ) *p++ = 0;
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}
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#if !defined(POLARSSL_SHA256_ALT)
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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 sha256_init( sha256_context *ctx )
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{
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memset( ctx, 0, sizeof( sha256_context ) );
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}
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void sha256_free( sha256_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( sha256_context ) );
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}
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/*
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* SHA-256 context setup
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*/
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void sha256_starts( sha256_context *ctx, int is224 )
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{
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ctx->total[0] = 0;
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ctx->total[1] = 0;
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if( is224 == 0 )
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{
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/* SHA-256 */
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ctx->state[0] = 0x6A09E667;
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ctx->state[1] = 0xBB67AE85;
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ctx->state[2] = 0x3C6EF372;
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ctx->state[3] = 0xA54FF53A;
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ctx->state[4] = 0x510E527F;
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ctx->state[5] = 0x9B05688C;
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ctx->state[6] = 0x1F83D9AB;
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ctx->state[7] = 0x5BE0CD19;
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}
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else
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{
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/* SHA-224 */
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ctx->state[0] = 0xC1059ED8;
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ctx->state[1] = 0x367CD507;
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ctx->state[2] = 0x3070DD17;
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ctx->state[3] = 0xF70E5939;
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ctx->state[4] = 0xFFC00B31;
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ctx->state[5] = 0x68581511;
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ctx->state[6] = 0x64F98FA7;
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ctx->state[7] = 0xBEFA4FA4;
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}
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ctx->is224 = is224;
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}
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void sha256_process( sha256_context *ctx, const unsigned char data[64] )
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{
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uint32_t temp1, temp2, W[64];
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uint32_t A, B, C, D, E, F, G, H;
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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 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 = 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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F = ctx->state[5];
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G = ctx->state[6];
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H = ctx->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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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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ctx->state[5] += F;
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ctx->state[6] += G;
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ctx->state[7] += H;
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}
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/*
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* SHA-256 process buffer
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*/
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void sha256_update( sha256_context *ctx, const unsigned char *input,
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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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sha256_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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sha256_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 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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/*
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* SHA-256 final digest
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*/
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void sha256_finish( sha256_context *ctx, unsigned char output[32] )
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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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sha256_update( ctx, sha256_padding, padn );
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sha256_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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PUT_UINT32_BE( ctx->state[5], output, 20 );
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PUT_UINT32_BE( ctx->state[6], output, 24 );
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if( ctx->is224 == 0 )
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PUT_UINT32_BE( ctx->state[7], output, 28 );
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}
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#endif /* !POLARSSL_SHA256_ALT */
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/*
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* output = SHA-256( input buffer )
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*/
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void sha256( const unsigned char *input, size_t ilen,
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unsigned char output[32], int is224 )
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{
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sha256_context ctx;
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sha256_init( &ctx );
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sha256_starts( &ctx, is224 );
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sha256_update( &ctx, input, ilen );
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sha256_finish( &ctx, output );
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sha256_free( &ctx );
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}
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#if defined(POLARSSL_FS_IO)
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/*
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* output = SHA-256( file contents )
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*/
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int sha256_file( const char *path, unsigned char output[32], int is224 )
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{
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FILE *f;
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size_t n;
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sha256_context ctx;
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unsigned char buf[1024];
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if( ( f = fopen( path, "rb" ) ) == NULL )
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return( POLARSSL_ERR_SHA256_FILE_IO_ERROR );
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sha256_init( &ctx );
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sha256_starts( &ctx, is224 );
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while( ( n = fread( buf, 1, sizeof( buf ), f ) ) > 0 )
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sha256_update( &ctx, buf, n );
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sha256_finish( &ctx, output );
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sha256_free( &ctx );
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if( ferror( f ) != 0 )
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{
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fclose( f );
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return( POLARSSL_ERR_SHA256_FILE_IO_ERROR );
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}
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fclose( f );
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return( 0 );
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}
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#endif /* POLARSSL_FS_IO */
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#if defined(POLARSSL_SELF_TEST)
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/*
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* FIPS-180-2 test vectors
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*/
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static const unsigned char sha256_test_buf[3][57] =
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{
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{ "abc" },
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{ "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq" },
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{ "" }
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};
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static const int sha256_test_buflen[3] =
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{
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3, 56, 1000
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};
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static const unsigned char sha256_test_sum[6][32] =
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{
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/*
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* SHA-224 test vectors
|
|
*/
|
|
{ 0x23, 0x09, 0x7D, 0x22, 0x34, 0x05, 0xD8, 0x22,
|
|
0x86, 0x42, 0xA4, 0x77, 0xBD, 0xA2, 0x55, 0xB3,
|
|
0x2A, 0xAD, 0xBC, 0xE4, 0xBD, 0xA0, 0xB3, 0xF7,
|
|
0xE3, 0x6C, 0x9D, 0xA7 },
|
|
{ 0x75, 0x38, 0x8B, 0x16, 0x51, 0x27, 0x76, 0xCC,
|
|
0x5D, 0xBA, 0x5D, 0xA1, 0xFD, 0x89, 0x01, 0x50,
|
|
0xB0, 0xC6, 0x45, 0x5C, 0xB4, 0xF5, 0x8B, 0x19,
|
|
0x52, 0x52, 0x25, 0x25 },
|
|
{ 0x20, 0x79, 0x46, 0x55, 0x98, 0x0C, 0x91, 0xD8,
|
|
0xBB, 0xB4, 0xC1, 0xEA, 0x97, 0x61, 0x8A, 0x4B,
|
|
0xF0, 0x3F, 0x42, 0x58, 0x19, 0x48, 0xB2, 0xEE,
|
|
0x4E, 0xE7, 0xAD, 0x67 },
|
|
|
|
/*
|
|
* SHA-256 test vectors
|
|
*/
|
|
{ 0xBA, 0x78, 0x16, 0xBF, 0x8F, 0x01, 0xCF, 0xEA,
|
|
0x41, 0x41, 0x40, 0xDE, 0x5D, 0xAE, 0x22, 0x23,
|
|
0xB0, 0x03, 0x61, 0xA3, 0x96, 0x17, 0x7A, 0x9C,
|
|
0xB4, 0x10, 0xFF, 0x61, 0xF2, 0x00, 0x15, 0xAD },
|
|
{ 0x24, 0x8D, 0x6A, 0x61, 0xD2, 0x06, 0x38, 0xB8,
|
|
0xE5, 0xC0, 0x26, 0x93, 0x0C, 0x3E, 0x60, 0x39,
|
|
0xA3, 0x3C, 0xE4, 0x59, 0x64, 0xFF, 0x21, 0x67,
|
|
0xF6, 0xEC, 0xED, 0xD4, 0x19, 0xDB, 0x06, 0xC1 },
|
|
{ 0xCD, 0xC7, 0x6E, 0x5C, 0x99, 0x14, 0xFB, 0x92,
|
|
0x81, 0xA1, 0xC7, 0xE2, 0x84, 0xD7, 0x3E, 0x67,
|
|
0xF1, 0x80, 0x9A, 0x48, 0xA4, 0x97, 0x20, 0x0E,
|
|
0x04, 0x6D, 0x39, 0xCC, 0xC7, 0x11, 0x2C, 0xD0 }
|
|
};
|
|
|
|
/*
|
|
* Checkup routine
|
|
*/
|
|
int sha256_self_test( int verbose )
|
|
{
|
|
int i, j, k, buflen, ret = 0;
|
|
unsigned char buf[1024];
|
|
unsigned char sha256sum[32];
|
|
sha256_context ctx;
|
|
|
|
sha256_init( &ctx );
|
|
|
|
for( i = 0; i < 6; i++ )
|
|
{
|
|
j = i % 3;
|
|
k = i < 3;
|
|
|
|
if( verbose != 0 )
|
|
polarssl_printf( " SHA-%d test #%d: ", 256 - k * 32, j + 1 );
|
|
|
|
sha256_starts( &ctx, k );
|
|
|
|
if( j == 2 )
|
|
{
|
|
memset( buf, 'a', buflen = 1000 );
|
|
|
|
for( j = 0; j < 1000; j++ )
|
|
sha256_update( &ctx, buf, buflen );
|
|
}
|
|
else
|
|
sha256_update( &ctx, sha256_test_buf[j],
|
|
sha256_test_buflen[j] );
|
|
|
|
sha256_finish( &ctx, sha256sum );
|
|
|
|
if( memcmp( sha256sum, sha256_test_sum[i], 32 - k * 4 ) != 0 )
|
|
{
|
|
if( verbose != 0 )
|
|
polarssl_printf( "failed\n" );
|
|
|
|
ret = 1;
|
|
goto exit;
|
|
}
|
|
|
|
if( verbose != 0 )
|
|
polarssl_printf( "passed\n" );
|
|
}
|
|
|
|
if( verbose != 0 )
|
|
polarssl_printf( "\n" );
|
|
|
|
exit:
|
|
sha256_free( &ctx );
|
|
|
|
return( ret );
|
|
}
|
|
|
|
#endif /* POLARSSL_SELF_TEST */
|
|
|
|
#endif /* POLARSSL_SHA256_C */
|