/* *  FIPS-180-2 compliant SHA-256 implementation * *  Copyright (C) 2001-2003  Christophe Devine * *  This program is free software; you can redistribute it and/or modify *  it under the terms of the GNU General Public License as published by *  the Free Software Foundation; either version 2 of the License, or *  (at your option) any later version. * *  This program is distributed in the hope that it will be useful, *  but WITHOUT ANY WARRANTY; without even the implied warranty of *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the *  GNU General Public License for more details. * *  You should have received a copy of the GNU General Public License *  along with this program; if not, write to the Free Software *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */#include <string.h>#include "sha256.h"#define GET_quint32(n,b,i)                       \{                                               \    (n) = ( (uint32) (b)[(i)    ] << 24 )       \        | ( (uint32) (b)[(i) + 1] << 16 )       \        | ( (uint32) (b)[(i) + 2] <<  8 )       \        | ( (uint32) (b)[(i) + 3]       );      \}#define PUT_quint32(n,b,i)                       \{                                               \    (b)[(i)    ] = (uint8) ( (n) >> 24 );       \    (b)[(i) + 1] = (uint8) ( (n) >> 16 );       \    (b)[(i) + 2] = (uint8) ( (n) >>  8 );       \    (b)[(i) + 3] = (uint8) ( (n)       );       \}void sha256_starts( sha256_context *ctx ){    ctx->total[0] = 0;    ctx->total[1] = 0;    ctx->state[0] = 0x6A09E667;    ctx->state[1] = 0xBB67AE85;    ctx->state[2] = 0x3C6EF372;    ctx->state[3] = 0xA54FF53A;    ctx->state[4] = 0x510E527F;    ctx->state[5] = 0x9B05688C;    ctx->state[6] = 0x1F83D9AB;    ctx->state[7] = 0x5BE0CD19;}void sha256_process( sha256_context *ctx, uint8 data[64] ){    uint32 temp1, temp2, W[64];    uint32 A, B, C, D, E, F, G, H;    GET_quint32( W[0],  data,  0 );    GET_quint32( W[1],  data,  4 );    GET_quint32( W[2],  data,  8 );    GET_quint32( W[3],  data, 12 );    GET_quint32( W[4],  data, 16 );    GET_quint32( W[5],  data, 20 );    GET_quint32( W[6],  data, 24 );    GET_quint32( W[7],  data, 28 );    GET_quint32( W[8],  data, 32 );    GET_quint32( W[9],  data, 36 );    GET_quint32( W[10], data, 40 );    GET_quint32( W[11], data, 44 );    GET_quint32( W[12], data, 48 );    GET_quint32( W[13], data, 52 );    GET_quint32( W[14], data, 56 );    GET_quint32( W[15], data, 60 );#define  SHR(x,n) ((x & 0xFFFFFFFF) >> n)#define ROTR(x,n) (SHR(x,n) | (x << (32 - n)))#define S0(x) (ROTR(x, 7) ^ ROTR(x,18) ^  SHR(x, 3))#define S1(x) (ROTR(x,17) ^ ROTR(x,19) ^  SHR(x,10))#define S2(x) (ROTR(x, 2) ^ ROTR(x,13) ^ ROTR(x,22))#define S3(x) (ROTR(x, 6) ^ ROTR(x,11) ^ ROTR(x,25))#define F0(x,y,z) ((x & y) | (z & (x | y)))#define F1(x,y,z) (z ^ (x & (y ^ z)))#define R(t)                                    \(                                               \    W[t] = S1(W[t -  2]) + W[t -  7] +          \           S0(W[t - 15]) + W[t - 16]            \)#define P(a,b,c,d,e,f,g,h,x,K)                  \{                                               \    temp1 = h + S3(e) + F1(e,f,g) + K + x;      \    temp2 = S2(a) + F0(a,b,c);                  \    d += temp1; h = temp1 + temp2;              \}    A = ctx->state[0];    B = ctx->state[1];    C = ctx->state[2];    D = ctx->state[3];    E = ctx->state[4];    F = ctx->state[5];    G = ctx->state[6];    H = ctx->state[7];    P( A, B, C, D, E, F, G, H, W[ 0], 0x428A2F98 );    P( H, A, B, C, D, E, F, G, W[ 1], 0x71374491 );    P( G, H, A, B, C, D, E, F, W[ 2], 0xB5C0FBCF );    P( F, G, H, A, B, C, D, E, W[ 3], 0xE9B5DBA5 );    P( E, F, G, H, A, B, C, D, W[ 4], 0x3956C25B );    P( D, E, F, G, H, A, B, C, W[ 5], 0x59F111F1 );    P( C, D, E, F, G, H, A, B, W[ 6], 0x923F82A4 );    P( B, C, D, E, F, G, H, A, W[ 7], 0xAB1C5ED5 );    P( A, B, C, D, E, F, G, H, W[ 8], 0xD807AA98 );    P( H, A, B, C, D, E, F, G, W[ 9], 0x12835B01 );    P( G, H, A, B, C, D, E, F, W[10], 0x243185BE );    P( F, G, H, A, B, C, D, E, W[11], 0x550C7DC3 );    P( E, F, G, H, A, B, C, D, W[12], 0x72BE5D74 );    P( D, E, F, G, H, A, B, C, W[13], 0x80DEB1FE );    P( C, D, E, F, G, H, A, B, W[14], 0x9BDC06A7 );    P( B, C, D, E, F, G, H, A, W[15], 0xC19BF174 );    P( A, B, C, D, E, F, G, H, R(16), 0xE49B69C1 );    P( H, A, B, C, D, E, F, G, R(17), 0xEFBE4786 );    P( G, H, A, B, C, D, E, F, R(18), 0x0FC19DC6 );    P( F, G, H, A, B, C, D, E, R(19), 0x240CA1CC );    P( E, F, G, H, A, B, C, D, R(20), 0x2DE92C6F );    P( D, E, F, G, H, A, B, C, R(21), 0x4A7484AA );    P( C, D, E, F, G, H, A, B, R(22), 0x5CB0A9DC );    P( B, C, D, E, F, G, H, A, R(23), 0x76F988DA );    P( A, B, C, D, E, F, G, H, R(24), 0x983E5152 );    P( H, A, B, C, D, E, F, G, R(25), 0xA831C66D );    P( G, H, A, B, C, D, E, F, R(26), 0xB00327C8 );    P( F, G, H, A, B, C, D, E, R(27), 0xBF597FC7 );    P( E, F, G, H, A, B, C, D, R(28), 0xC6E00BF3 );    P( D, E, F, G, H, A, B, C, R(29), 0xD5A79147 );    P( C, D, E, F, G, H, A, B, R(30), 0x06CA6351 );    P( B, C, D, E, F, G, H, A, R(31), 0x14292967 );    P( A, B, C, D, E, F, G, H, R(32), 0x27B70A85 );    P( H, A, B, C, D, E, F, G, R(33), 0x2E1B2138 );    P( G, H, A, B, C, D, E, F, R(34), 0x4D2C6DFC );    P( F, G, H, A, B, C, D, E, R(35), 0x53380D13 );    P( E, F, G, H, A, B, C, D, R(36), 0x650A7354 );    P( D, E, F, G, H, A, B, C, R(37), 0x766A0ABB );    P( C, D, E, F, G, H, A, B, R(38), 0x81C2C92E );    P( B, C, D, E, F, G, H, A, R(39), 0x92722C85 );    P( A, B, C, D, E, F, G, H, R(40), 0xA2BFE8A1 );    P( H, A, B, C, D, E, F, G, R(41), 0xA81A664B );    P( G, H, A, B, C, D, E, F, R(42), 0xC24B8B70 );    P( F, G, H, A, B, C, D, E, R(43), 0xC76C51A3 );    P( E, F, G, H, A, B, C, D, R(44), 0xD192E819 );    P( D, E, F, G, H, A, B, C, R(45), 0xD6990624 );    P( C, D, E, F, G, H, A, B, R(46), 0xF40E3585 );    P( B, C, D, E, F, G, H, A, R(47), 0x106AA070 );    P( A, B, C, D, E, F, G, H, R(48), 0x19A4C116 );    P( H, A, B, C, D, E, F, G, R(49), 0x1E376C08 );    P( G, H, A, B, C, D, E, F, R(50), 0x2748774C );    P( F, G, H, A, B, C, D, E, R(51), 0x34B0BCB5 );    P( E, F, G, H, A, B, C, D, R(52), 0x391C0CB3 );    P( D, E, F, G, H, A, B, C, R(53), 0x4ED8AA4A );    P( C, D, E, F, G, H, A, B, R(54), 0x5B9CCA4F );    P( B, C, D, E, F, G, H, A, R(55), 0x682E6FF3 );    P( A, B, C, D, E, F, G, H, R(56), 0x748F82EE );    P( H, A, B, C, D, E, F, G, R(57), 0x78A5636F );    P( G, H, A, B, C, D, E, F, R(58), 0x84C87814 );    P( F, G, H, A, B, C, D, E, R(59), 0x8CC70208 );    P( E, F, G, H, A, B, C, D, R(60), 0x90BEFFFA );    P( D, E, F, G, H, A, B, C, R(61), 0xA4506CEB );    P( C, D, E, F, G, H, A, B, R(62), 0xBEF9A3F7 );    P( B, C, D, E, F, G, H, A, R(63), 0xC67178F2 );    ctx->state[0] += A;    ctx->state[1] += B;    ctx->state[2] += C;    ctx->state[3] += D;    ctx->state[4] += E;    ctx->state[5] += F;    ctx->state[6] += G;    ctx->state[7] += H;}void sha256_update( sha256_context *ctx, uint8 *input, uint32 length ){    uint32 left, fill;    if( ! length ) return;    left = ctx->total[0] & 0x3F;    fill = 64 - left;    ctx->total[0] += length;    ctx->total[0] &= 0xFFFFFFFF;    if( ctx->total[0] < length )        ctx->total[1]++;    if( left && length >= fill )    {        memcpy( (void *) (ctx->buffer + left),                (void *) input, fill );        sha256_process( ctx, ctx->buffer );        length -= fill;        input  += fill;        left = 0;    }    while( length >= 64 )    {        sha256_process( ctx, input );        length -= 64;        input  += 64;    }    if( length )    {        memcpy( (void *) (ctx->buffer + left),                (void *) input, length );    }}static uint8 sha256_padding[64] ={ 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};void sha256_finish( sha256_context *ctx, uint8 digest[32] ){    uint32 last, padn;    uint32 high, low;    uint8 msglen[8];    high = ( ctx->total[0] >> 29 )         | ( ctx->total[1] <<  3 );    low  = ( ctx->total[0] <<  3 );    PUT_quint32( high, msglen, 0 );    PUT_quint32( low,  msglen, 4 );    last = ctx->total[0] & 0x3F;    padn = ( last < 56 ) ? ( 56 - last ) : ( 120 - last );    sha256_update( ctx, sha256_padding, padn );    sha256_update( ctx, msglen, 8 );    PUT_quint32( ctx->state[0], digest,  0 );    PUT_quint32( ctx->state[1], digest,  4 );    PUT_quint32( ctx->state[2], digest,  8 );    PUT_quint32( ctx->state[3], digest, 12 );    PUT_quint32( ctx->state[4], digest, 16 );    PUT_quint32( ctx->state[5], digest, 20 );    PUT_quint32( ctx->state[6], digest, 24 );    PUT_quint32( ctx->state[7], digest, 28 );}#ifdef TEST#include <stdlib.h>#include <stdio.h>/* * those are the standard FIPS-180-2 test vectors */static char *msg[] = {    "abc",    "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq",    NULL};static char *val[] ={    "ba7816bf8f01cfea414140de5dae2223" \    "b00361a396177a9cb410ff61f20015ad",    "248d6a61d20638b8e5c026930c3e6039" \    "a33ce45964ff2167f6ecedd419db06c1",    "cdc76e5c9914fb9281a1c7e284d73e67" \    "f1809a48a497200e046d39ccc7112cd0"};int main( int argc, char *argv[] ){    FILE *f;    int i, j;    char output[65];    sha256_context ctx;    unsigned char buf[1000];    unsigned char sha256sum[32];    if( argc < 2 )    {        printf( "\n SHA-256 Validation Tests:\n\n" );        for( i = 0; i < 3; i++ )        {            printf( " Test %d ", i + 1 );            sha256_starts( &ctx );            if( i < 2 )            {                sha256_update( &ctx, (uint8 *) msg[i],                               strlen( msg[i] ) );            }            else            {                memset( buf, 'a', 1000 );                for( j = 0; j < 1000; j++ )                {                    sha256_update( &ctx, (uint8 *) buf, 1000 );                }            }            sha256_finish( &ctx, sha256sum );            for( j = 0; j < 32; j++ )            {                sprintf( output + j * 2, "%02x", sha256sum[j] );            }            if( memcmp( output, val[i], 64 ) )            {                printf( "failed!\n" );                return( 1 );            }            printf( "passed.\n" );        }        printf( "\n" );    }    else    {        if( ! ( f = fopen( argv[1], "rb" ) ) )        {            perror( "fopen" );            return( 1 );        }        sha256_starts( &ctx );        while( ( i = fread( buf, 1, sizeof( buf ), f ) ) > 0 )        {            sha256_update( &ctx, buf, i );        }        sha256_finish( &ctx, sha256sum );        for( j = 0; j < 32; j++ )        {            printf( "%02x", sha256sum[j] );        }        printf( "  %s\n", argv[1] );    }    return( 0 );}#endif