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https://github.com/cryb-to/cryb-to.git
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187 lines
5.4 KiB
C
187 lines
5.4 KiB
C
/*
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* Copyright (c) 2006-2007 Christophe Devine
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* The MD2 algorithm was designed by Ron Rivest in 1989.
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*
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* http://www.ietf.org/rfc/rfc1115.txt
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* http://www.ietf.org/rfc/rfc1319.txt
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*/
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#include "cryb/impl.h"
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#include <stdint.h>
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#include <string.h>
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#include <cryb/md2.h>
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static const uint8_t PI_SUBST[256] =
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{
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0x29, 0x2E, 0x43, 0xC9, 0xA2, 0xD8, 0x7C, 0x01, 0x3D, 0x36,
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0x54, 0xA1, 0xEC, 0xF0, 0x06, 0x13, 0x62, 0xA7, 0x05, 0xF3,
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0xC0, 0xC7, 0x73, 0x8C, 0x98, 0x93, 0x2B, 0xD9, 0xBC, 0x4C,
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0x82, 0xCA, 0x1E, 0x9B, 0x57, 0x3C, 0xFD, 0xD4, 0xE0, 0x16,
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0x67, 0x42, 0x6F, 0x18, 0x8A, 0x17, 0xE5, 0x12, 0xBE, 0x4E,
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0xC4, 0xD6, 0xDA, 0x9E, 0xDE, 0x49, 0xA0, 0xFB, 0xF5, 0x8E,
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0xBB, 0x2F, 0xEE, 0x7A, 0xA9, 0x68, 0x79, 0x91, 0x15, 0xB2,
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0x07, 0x3F, 0x94, 0xC2, 0x10, 0x89, 0x0B, 0x22, 0x5F, 0x21,
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0x80, 0x7F, 0x5D, 0x9A, 0x5A, 0x90, 0x32, 0x27, 0x35, 0x3E,
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0xCC, 0xE7, 0xBF, 0xF7, 0x97, 0x03, 0xFF, 0x19, 0x30, 0xB3,
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0x48, 0xA5, 0xB5, 0xD1, 0xD7, 0x5E, 0x92, 0x2A, 0xAC, 0x56,
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0xAA, 0xC6, 0x4F, 0xB8, 0x38, 0xD2, 0x96, 0xA4, 0x7D, 0xB6,
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0x76, 0xFC, 0x6B, 0xE2, 0x9C, 0x74, 0x04, 0xF1, 0x45, 0x9D,
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0x70, 0x59, 0x64, 0x71, 0x87, 0x20, 0x86, 0x5B, 0xCF, 0x65,
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0xE6, 0x2D, 0xA8, 0x02, 0x1B, 0x60, 0x25, 0xAD, 0xAE, 0xB0,
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0xB9, 0xF6, 0x1C, 0x46, 0x61, 0x69, 0x34, 0x40, 0x7E, 0x0F,
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0x55, 0x47, 0xA3, 0x23, 0xDD, 0x51, 0xAF, 0x3A, 0xC3, 0x5C,
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0xF9, 0xCE, 0xBA, 0xC5, 0xEA, 0x26, 0x2C, 0x53, 0x0D, 0x6E,
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0x85, 0x28, 0x84, 0x09, 0xD3, 0xDF, 0xCD, 0xF4, 0x41, 0x81,
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0x4D, 0x52, 0x6A, 0xDC, 0x37, 0xC8, 0x6C, 0xC1, 0xAB, 0xFA,
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0x24, 0xE1, 0x7B, 0x08, 0x0C, 0xBD, 0xB1, 0x4A, 0x78, 0x88,
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0x95, 0x8B, 0xE3, 0x63, 0xE8, 0x6D, 0xE9, 0xCB, 0xD5, 0xFE,
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0x3B, 0x00, 0x1D, 0x39, 0xF2, 0xEF, 0xB7, 0x0E, 0x66, 0x58,
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0xD0, 0xE4, 0xA6, 0x77, 0x72, 0xF8, 0xEB, 0x75, 0x4B, 0x0A,
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0x31, 0x44, 0x50, 0xB4, 0x8F, 0xED, 0x1F, 0x1A, 0xDB, 0x99,
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0x8D, 0x33, 0x9F, 0x11, 0x83, 0x14
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};
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/*
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* MD2 context setup
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*/
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void md2_init( md2_ctx *ctx )
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{
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memset( ctx, 0, sizeof( md2_ctx ) );
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}
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static void md2_process( md2_ctx *ctx )
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{
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int i, j;
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uint8_t t = 0;
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for( i = 0; i < 16; i++ )
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{
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ctx->state[i + 16] = ctx->buffer[i];
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ctx->state[i + 32] =
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(uint8_t)( ctx->buffer[i] ^ ctx->state[i]);
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}
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for( i = 0; i < 18; i++ )
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{
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for( j = 0; j < 48; j++ )
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{
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ctx->state[j] = (uint8_t)
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( ctx->state[j] ^ PI_SUBST[t] );
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t = ctx->state[j];
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}
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t = (uint8_t)( t + i );
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}
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t = ctx->cksum[15];
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for( i = 0; i < 16; i++ )
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{
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ctx->cksum[i] = (uint8_t)
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( ctx->cksum[i] ^ PI_SUBST[ctx->buffer[i] ^ t] );
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t = ctx->cksum[i];
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}
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}
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/*
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* MD2 process buffer
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*/
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void md2_update( md2_ctx *ctx, const void *input, int ilen )
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{
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int fill;
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while( ilen > 0 )
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{
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if( ctx->left + ilen > 16 )
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fill = 16 - ctx->left;
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else
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fill = ilen;
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memcpy( ctx->buffer + ctx->left, input, fill );
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ctx->left += fill;
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input += fill;
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ilen -= fill;
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if( ctx->left == 16 )
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{
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ctx->left = 0;
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md2_process( ctx );
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}
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}
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}
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/*
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* MD2 final digest
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*/
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void md2_final( md2_ctx *ctx, uint8_t *output )
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{
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int i;
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uint8_t x;
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x = (uint8_t)( 16 - ctx->left );
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for( i = ctx->left; i < 16; i++ )
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ctx->buffer[i] = x;
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md2_process( ctx );
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memcpy( ctx->buffer, ctx->cksum, sizeof ctx->cksum );
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md2_process( ctx );
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memcpy( output, ctx->state, MD2_DIGEST_LEN );
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}
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/*
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* output = MD2( input buffer )
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*/
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void md2_complete( const void *input, int ilen, uint8_t *output )
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{
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md2_ctx ctx;
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md2_init( &ctx );
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md2_update( &ctx, input, ilen );
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md2_final( &ctx, output );
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memset( &ctx, 0, sizeof( md2_ctx ) );
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}
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digest_algorithm md2_algorithm = {
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.name = "md2",
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.contextlen = sizeof(md2_ctx),
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.blocklen = MD2_BLOCK_LEN,
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.digestlen = MD2_DIGEST_LEN,
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.init = (digest_init_func)md2_init,
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.update = (digest_update_func)md2_update,
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.final = (digest_final_func)md2_final,
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.complete = (digest_complete_func)md2_complete,
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};
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