mirror of https://github.com/cryb-to/cryb-to.git
252 lines
6.6 KiB
C
252 lines
6.6 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 MD4 algorithm was designed by Ron Rivest in 1990.
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*
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* http://www.ietf.org/rfc/rfc1186.txt
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* http://www.ietf.org/rfc/rfc1320.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/endian.h>
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#include <cryb/md4.h>
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/*
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* MD4 context setup
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*/
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void md4_init( md4_ctx *ctx )
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{
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ctx->total = 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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}
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static void md4_process( md4_ctx *ctx, const uint8_t *data )
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{
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uint32_t X[16], A, B, C, D;
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X[ 0] = le32dec(data + 0);
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X[ 1] = le32dec(data + 4);
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X[ 2] = le32dec(data + 8);
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X[ 3] = le32dec(data + 12);
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X[ 4] = le32dec(data + 16);
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X[ 5] = le32dec(data + 20);
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X[ 6] = le32dec(data + 24);
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X[ 7] = le32dec(data + 28);
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X[ 8] = le32dec(data + 32);
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X[ 9] = le32dec(data + 36);
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X[10] = le32dec(data + 40);
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X[11] = le32dec(data + 44);
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X[12] = le32dec(data + 48);
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X[13] = le32dec(data + 52);
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X[14] = le32dec(data + 56);
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X[15] = le32dec(data + 60);
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#define S(x,n) ((x << n) | ((x & 0xFFFFFFFF) >> (32 - n)))
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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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#define F(x, y, z) ((x & y) | ((~x) & z))
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#define P(a,b,c,d,x,s) { a += F(b,c,d) + x; a = S(a,s); }
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P( A, B, C, D, X[ 0], 3 );
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P( D, A, B, C, X[ 1], 7 );
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P( C, D, A, B, X[ 2], 11 );
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P( B, C, D, A, X[ 3], 19 );
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P( A, B, C, D, X[ 4], 3 );
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P( D, A, B, C, X[ 5], 7 );
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P( C, D, A, B, X[ 6], 11 );
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P( B, C, D, A, X[ 7], 19 );
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P( A, B, C, D, X[ 8], 3 );
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P( D, A, B, C, X[ 9], 7 );
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P( C, D, A, B, X[10], 11 );
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P( B, C, D, A, X[11], 19 );
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P( A, B, C, D, X[12], 3 );
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P( D, A, B, C, X[13], 7 );
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P( C, D, A, B, X[14], 11 );
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P( B, C, D, A, X[15], 19 );
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#undef P
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#undef F
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#define F(x,y,z) ((x & y) | (x & z) | (y & z))
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#define P(a,b,c,d,x,s) { a += F(b,c,d) + x + 0x5A827999; a = S(a,s); }
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P( A, B, C, D, X[ 0], 3 );
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P( D, A, B, C, X[ 4], 5 );
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P( C, D, A, B, X[ 8], 9 );
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P( B, C, D, A, X[12], 13 );
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P( A, B, C, D, X[ 1], 3 );
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P( D, A, B, C, X[ 5], 5 );
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P( C, D, A, B, X[ 9], 9 );
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P( B, C, D, A, X[13], 13 );
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P( A, B, C, D, X[ 2], 3 );
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P( D, A, B, C, X[ 6], 5 );
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P( C, D, A, B, X[10], 9 );
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P( B, C, D, A, X[14], 13 );
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P( A, B, C, D, X[ 3], 3 );
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P( D, A, B, C, X[ 7], 5 );
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P( C, D, A, B, X[11], 9 );
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P( B, C, D, A, X[15], 13 );
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#undef P
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#undef F
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#define F(x,y,z) (x ^ y ^ z)
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#define P(a,b,c,d,x,s) { a += F(b,c,d) + x + 0x6ED9EBA1; a = S(a,s); }
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P( A, B, C, D, X[ 0], 3 );
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P( D, A, B, C, X[ 8], 9 );
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P( C, D, A, B, X[ 4], 11 );
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P( B, C, D, A, X[12], 15 );
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P( A, B, C, D, X[ 2], 3 );
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P( D, A, B, C, X[10], 9 );
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P( C, D, A, B, X[ 6], 11 );
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P( B, C, D, A, X[14], 15 );
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P( A, B, C, D, X[ 1], 3 );
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P( D, A, B, C, X[ 9], 9 );
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P( C, D, A, B, X[ 5], 11 );
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P( B, C, D, A, X[13], 15 );
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P( A, B, C, D, X[ 3], 3 );
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P( D, A, B, C, X[11], 9 );
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P( C, D, A, B, X[ 7], 11 );
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P( B, C, D, A, X[15], 15 );
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#undef F
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#undef P
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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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}
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/*
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* MD4 process buffer
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*/
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void md4_update( md4_ctx *ctx, const void *input, int ilen )
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{
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int 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 & 0x3F;
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fill = 64 - left;
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ctx->total += ilen;
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if( left && ilen >= fill )
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{
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memcpy( (ctx->buffer + left), input, fill );
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md4_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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md4_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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{
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memcpy( (ctx->buffer + left), input, ilen );
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}
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}
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static const uint8_t md4_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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* MD4 final digest
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*/
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void md4_final( md4_ctx *ctx, uint8_t *output )
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{
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uint32_t last, padn;
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uint8_t msglen[8];
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le64enc(msglen, ctx->total << 3);
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last = ctx->total & 0x3F;
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padn = ( last < 56 ) ? ( 56 - last ) : ( 120 - last );
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md4_update( ctx, md4_padding, padn );
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md4_update( ctx, msglen, 8 );
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le32enc(output + 0, ctx->state[0]);
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le32enc(output + 4, ctx->state[1]);
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le32enc(output + 8, ctx->state[2]);
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le32enc(output + 12, ctx->state[3]);
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}
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/*
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* output = MD4( input buffer )
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*/
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void md4_complete( const void *input, int ilen, uint8_t *output )
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{
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md4_ctx ctx;
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md4_init( &ctx );
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md4_update( &ctx, input, ilen );
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md4_final( &ctx, output );
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memset( &ctx, 0, sizeof( md4_ctx ) );
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}
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digest_algorithm md4_digest = {
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.name = "md4",
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.contextlen = sizeof(md4_ctx),
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.blocklen = MD4_BLOCK_LEN,
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.digestlen = MD4_DIGEST_LEN,
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.init = (digest_init_func)md4_init,
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.update = (digest_update_func)md4_update,
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.final = (digest_final_func)md4_final,
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.complete = (digest_complete_func)md4_complete,
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};
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