mirror of
https://github.com/moparisthebest/pacman
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332 lines
9.1 KiB
C
332 lines
9.1 KiB
C
/*
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* RFC 1321 compliant MD5 implementation
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*
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* Copyright (C) 2006-2007 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, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* The MD5 algorithm was designed by Ron Rivest in 1991.
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*
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* http://www.ietf.org/rfc/rfc1321.txt
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*/
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/*
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* Pacman Notes:
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*
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* Taken from the XySSL project at www.xyssl.org under terms of the
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* GPL. This is from version 0.9 of the library, and has been modified
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* as following, which may be helpful for future updates:
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* * remove "xyssl/config.h" include
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* * change include from "xyssl/md5.h" to "md5.h"
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* * removal of HMAC code
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* * removal of SELF_TEST code
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* * removal of ipad and opad from the md5_context struct in md5.h
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* * change of md5_file prototype from
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* int md5_file( char *path, unsigned char *output )
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* to
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* int md5_file( const char *path, unsigned char *output )
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* * various static/inline changes
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*/
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#include <string.h>
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#include <stdio.h>
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#include "md5.h"
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/*
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* 32-bit integer manipulation macros (little endian)
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*/
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#ifndef GET_ULONG_LE
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#define GET_ULONG_LE(n,b,i) \
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{ \
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(n) = ( (unsigned long) (b)[(i) ] ) \
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| ( (unsigned long) (b)[(i) + 1] << 8 ) \
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| ( (unsigned long) (b)[(i) + 2] << 16 ) \
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| ( (unsigned long) (b)[(i) + 3] << 24 ); \
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}
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#endif
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#ifndef PUT_ULONG_LE
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#define PUT_ULONG_LE(n,b,i) \
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{ \
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(b)[(i) ] = (unsigned char) ( (n) ); \
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(b)[(i) + 1] = (unsigned char) ( (n) >> 8 ); \
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(b)[(i) + 2] = (unsigned char) ( (n) >> 16 ); \
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(b)[(i) + 3] = (unsigned char) ( (n) >> 24 ); \
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}
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#endif
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/*
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* MD5 context setup
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*/
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static inline void md5_starts( md5_context *ctx )
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{
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ctx->total[0] = 0;
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ctx->total[1] = 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 inline void md5_process( md5_context *ctx, unsigned char data[64] )
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{
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unsigned long X[16], A, B, C, D;
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GET_ULONG_LE( X[ 0], data, 0 );
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GET_ULONG_LE( X[ 1], data, 4 );
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GET_ULONG_LE( X[ 2], data, 8 );
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GET_ULONG_LE( X[ 3], data, 12 );
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GET_ULONG_LE( X[ 4], data, 16 );
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GET_ULONG_LE( X[ 5], data, 20 );
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GET_ULONG_LE( X[ 6], data, 24 );
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GET_ULONG_LE( X[ 7], data, 28 );
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GET_ULONG_LE( X[ 8], data, 32 );
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GET_ULONG_LE( X[ 9], data, 36 );
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GET_ULONG_LE( X[10], data, 40 );
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GET_ULONG_LE( X[11], data, 44 );
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GET_ULONG_LE( X[12], data, 48 );
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GET_ULONG_LE( X[13], data, 52 );
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GET_ULONG_LE( X[14], data, 56 );
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GET_ULONG_LE( X[15], data, 60 );
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#define S(x,n) ((x << n) | ((x & 0xFFFFFFFF) >> (32 - n)))
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#define P(a,b,c,d,k,s,t) \
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{ \
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a += F(b,c,d) + X[k] + t; a = S(a,s) + b; \
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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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#define F(x,y,z) (z ^ (x & (y ^ z)))
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P( A, B, C, D, 0, 7, 0xD76AA478 );
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P( D, A, B, C, 1, 12, 0xE8C7B756 );
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P( C, D, A, B, 2, 17, 0x242070DB );
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P( B, C, D, A, 3, 22, 0xC1BDCEEE );
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P( A, B, C, D, 4, 7, 0xF57C0FAF );
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P( D, A, B, C, 5, 12, 0x4787C62A );
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P( C, D, A, B, 6, 17, 0xA8304613 );
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P( B, C, D, A, 7, 22, 0xFD469501 );
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P( A, B, C, D, 8, 7, 0x698098D8 );
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P( D, A, B, C, 9, 12, 0x8B44F7AF );
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P( C, D, A, B, 10, 17, 0xFFFF5BB1 );
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P( B, C, D, A, 11, 22, 0x895CD7BE );
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P( A, B, C, D, 12, 7, 0x6B901122 );
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P( D, A, B, C, 13, 12, 0xFD987193 );
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P( C, D, A, B, 14, 17, 0xA679438E );
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P( B, C, D, A, 15, 22, 0x49B40821 );
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#undef F
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#define F(x,y,z) (y ^ (z & (x ^ y)))
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P( A, B, C, D, 1, 5, 0xF61E2562 );
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P( D, A, B, C, 6, 9, 0xC040B340 );
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P( C, D, A, B, 11, 14, 0x265E5A51 );
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P( B, C, D, A, 0, 20, 0xE9B6C7AA );
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P( A, B, C, D, 5, 5, 0xD62F105D );
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P( D, A, B, C, 10, 9, 0x02441453 );
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P( C, D, A, B, 15, 14, 0xD8A1E681 );
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P( B, C, D, A, 4, 20, 0xE7D3FBC8 );
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P( A, B, C, D, 9, 5, 0x21E1CDE6 );
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P( D, A, B, C, 14, 9, 0xC33707D6 );
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P( C, D, A, B, 3, 14, 0xF4D50D87 );
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P( B, C, D, A, 8, 20, 0x455A14ED );
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P( A, B, C, D, 13, 5, 0xA9E3E905 );
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P( D, A, B, C, 2, 9, 0xFCEFA3F8 );
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P( C, D, A, B, 7, 14, 0x676F02D9 );
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P( B, C, D, A, 12, 20, 0x8D2A4C8A );
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#undef F
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#define F(x,y,z) (x ^ y ^ z)
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P( A, B, C, D, 5, 4, 0xFFFA3942 );
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P( D, A, B, C, 8, 11, 0x8771F681 );
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P( C, D, A, B, 11, 16, 0x6D9D6122 );
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P( B, C, D, A, 14, 23, 0xFDE5380C );
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P( A, B, C, D, 1, 4, 0xA4BEEA44 );
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P( D, A, B, C, 4, 11, 0x4BDECFA9 );
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P( C, D, A, B, 7, 16, 0xF6BB4B60 );
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P( B, C, D, A, 10, 23, 0xBEBFBC70 );
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P( A, B, C, D, 13, 4, 0x289B7EC6 );
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P( D, A, B, C, 0, 11, 0xEAA127FA );
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P( C, D, A, B, 3, 16, 0xD4EF3085 );
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P( B, C, D, A, 6, 23, 0x04881D05 );
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P( A, B, C, D, 9, 4, 0xD9D4D039 );
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P( D, A, B, C, 12, 11, 0xE6DB99E5 );
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P( C, D, A, B, 15, 16, 0x1FA27CF8 );
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P( B, C, D, A, 2, 23, 0xC4AC5665 );
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#undef F
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#define F(x,y,z) (y ^ (x | ~z))
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P( A, B, C, D, 0, 6, 0xF4292244 );
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P( D, A, B, C, 7, 10, 0x432AFF97 );
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P( C, D, A, B, 14, 15, 0xAB9423A7 );
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P( B, C, D, A, 5, 21, 0xFC93A039 );
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P( A, B, C, D, 12, 6, 0x655B59C3 );
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P( D, A, B, C, 3, 10, 0x8F0CCC92 );
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P( C, D, A, B, 10, 15, 0xFFEFF47D );
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P( B, C, D, A, 1, 21, 0x85845DD1 );
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P( A, B, C, D, 8, 6, 0x6FA87E4F );
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P( D, A, B, C, 15, 10, 0xFE2CE6E0 );
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P( C, D, A, B, 6, 15, 0xA3014314 );
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P( B, C, D, A, 13, 21, 0x4E0811A1 );
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P( A, B, C, D, 4, 6, 0xF7537E82 );
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P( D, A, B, C, 11, 10, 0xBD3AF235 );
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P( C, D, A, B, 2, 15, 0x2AD7D2BB );
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P( B, C, D, A, 9, 21, 0xEB86D391 );
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#undef F
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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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* MD5 process buffer
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*/
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static inline void md5_update( md5_context *ctx, unsigned char *input, int ilen )
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{
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int fill;
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unsigned long 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] += ilen;
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ctx->total[0] &= 0xFFFFFFFF;
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if( ctx->total[0] < (unsigned long) 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),
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(void *) input, fill );
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md5_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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md5_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( (void *) (ctx->buffer + left),
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(void *) input, ilen );
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}
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}
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static unsigned char md5_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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* MD5 final digest
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*/
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static inline void md5_finish( md5_context *ctx, unsigned char output[16] )
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{
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unsigned long last, padn;
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unsigned long 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_ULONG_LE( low, msglen, 0 );
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PUT_ULONG_LE( high, 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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md5_update( ctx, (unsigned char *) md5_padding, padn );
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md5_update( ctx, msglen, 8 );
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PUT_ULONG_LE( ctx->state[0], output, 0 );
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PUT_ULONG_LE( ctx->state[1], output, 4 );
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PUT_ULONG_LE( ctx->state[2], output, 8 );
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PUT_ULONG_LE( ctx->state[3], output, 12 );
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}
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/*
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* output = MD5( input buffer )
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*/
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void md5( unsigned char *input, int ilen, unsigned char output[16] )
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{
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md5_context ctx;
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md5_starts( &ctx );
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md5_update( &ctx, input, ilen );
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md5_finish( &ctx, output );
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memset( &ctx, 0, sizeof( md5_context ) );
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}
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/*
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* output = MD5( file contents )
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*/
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int md5_file( const char *path, unsigned char output[16] )
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{
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FILE *f;
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size_t n;
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md5_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( 1 );
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md5_starts( &ctx );
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while( ( n = fread( buf, 1, sizeof( buf ), f ) ) > 0 )
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md5_update( &ctx, buf, (int) n );
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md5_finish( &ctx, output );
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memset( &ctx, 0, sizeof( md5_context ) );
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if( ferror( f ) != 0 )
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{
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fclose( f );
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return( 2 );
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}
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fclose( f );
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return( 0 );
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}
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