8e7454cc73
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17710 a1c6a512-1295-4272-9138-f99709370657
262 lines
10 KiB
C
262 lines
10 KiB
C
/*****************************************************************************
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* md5.c: not so strong MD5 hashing
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*****************************************************************************
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* Copyright (C) 2004-2005 the VideoLAN team
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* $Id: cb57f7b6522df0960a924193cfca438c03a92521 $
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*
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* Authors: Jon Lech Johansen <jon-vl@nanocrew.net>
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* Sam Hocevar <sam@zoy.org>
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*
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* Adapted to Rockbox by: Antoine Cellerier <dionoea at videolan dot 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
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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#include "plugin.h"
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#include "md5.h"
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static const struct plugin_api *rb;
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void md5_init( const struct plugin_api *api )
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{
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rb = api;
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}
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#ifdef ROCKBOX_BIG_ENDIAN
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static inline uint32_t GetDWLE( const void * _p )
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{
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const uint8_t * p = (const uint8_t *)_p;
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return ( ((uint32_t)p[3] << 24) | ((uint32_t)p[2] << 16)
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| ((uint32_t)p[1] << 8) | p[0] );
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}
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/*****************************************************************************
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* Reverse: reverse byte order
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*****************************************************************************/
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static inline void Reverse( uint32_t *p_buffer, int n )
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{
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int i;
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for( i = 0; i < n; i++ )
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{
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p_buffer[ i ] = GetDWLE(&p_buffer[ i ]);
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}
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}
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# define REVERSE( p, n ) Reverse( p, n )
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#else
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# define REVERSE( p, n )
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#endif
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#define F1( x, y, z ) ((z) ^ ((x) & ((y) ^ (z))))
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#define F2( x, y, z ) F1((z), (x), (y))
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#define F3( x, y, z ) ((x) ^ (y) ^ (z))
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#define F4( x, y, z ) ((y) ^ ((x) | ~(z)))
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#define MD5_DO( f, w, x, y, z, data, s ) \
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( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
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/*****************************************************************************
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* DigestMD5: update the MD5 digest with 64 bytes of data
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*****************************************************************************/
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static void DigestMD5( struct md5_s *p_md5, uint32_t *p_input )
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{
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uint32_t a, b, c, d;
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REVERSE( p_input, 16 );
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a = p_md5->p_digest[ 0 ];
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b = p_md5->p_digest[ 1 ];
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c = p_md5->p_digest[ 2 ];
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d = p_md5->p_digest[ 3 ];
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MD5_DO( F1, a, b, c, d, p_input[ 0 ] + 0xd76aa478, 7 );
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MD5_DO( F1, d, a, b, c, p_input[ 1 ] + 0xe8c7b756, 12 );
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MD5_DO( F1, c, d, a, b, p_input[ 2 ] + 0x242070db, 17 );
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MD5_DO( F1, b, c, d, a, p_input[ 3 ] + 0xc1bdceee, 22 );
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MD5_DO( F1, a, b, c, d, p_input[ 4 ] + 0xf57c0faf, 7 );
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MD5_DO( F1, d, a, b, c, p_input[ 5 ] + 0x4787c62a, 12 );
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MD5_DO( F1, c, d, a, b, p_input[ 6 ] + 0xa8304613, 17 );
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MD5_DO( F1, b, c, d, a, p_input[ 7 ] + 0xfd469501, 22 );
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MD5_DO( F1, a, b, c, d, p_input[ 8 ] + 0x698098d8, 7 );
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MD5_DO( F1, d, a, b, c, p_input[ 9 ] + 0x8b44f7af, 12 );
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MD5_DO( F1, c, d, a, b, p_input[ 10 ] + 0xffff5bb1, 17 );
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MD5_DO( F1, b, c, d, a, p_input[ 11 ] + 0x895cd7be, 22 );
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MD5_DO( F1, a, b, c, d, p_input[ 12 ] + 0x6b901122, 7 );
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MD5_DO( F1, d, a, b, c, p_input[ 13 ] + 0xfd987193, 12 );
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MD5_DO( F1, c, d, a, b, p_input[ 14 ] + 0xa679438e, 17 );
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MD5_DO( F1, b, c, d, a, p_input[ 15 ] + 0x49b40821, 22 );
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MD5_DO( F2, a, b, c, d, p_input[ 1 ] + 0xf61e2562, 5 );
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MD5_DO( F2, d, a, b, c, p_input[ 6 ] + 0xc040b340, 9 );
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MD5_DO( F2, c, d, a, b, p_input[ 11 ] + 0x265e5a51, 14 );
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MD5_DO( F2, b, c, d, a, p_input[ 0 ] + 0xe9b6c7aa, 20 );
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MD5_DO( F2, a, b, c, d, p_input[ 5 ] + 0xd62f105d, 5 );
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MD5_DO( F2, d, a, b, c, p_input[ 10 ] + 0x02441453, 9 );
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MD5_DO( F2, c, d, a, b, p_input[ 15 ] + 0xd8a1e681, 14 );
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MD5_DO( F2, b, c, d, a, p_input[ 4 ] + 0xe7d3fbc8, 20 );
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MD5_DO( F2, a, b, c, d, p_input[ 9 ] + 0x21e1cde6, 5 );
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MD5_DO( F2, d, a, b, c, p_input[ 14 ] + 0xc33707d6, 9 );
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MD5_DO( F2, c, d, a, b, p_input[ 3 ] + 0xf4d50d87, 14 );
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MD5_DO( F2, b, c, d, a, p_input[ 8 ] + 0x455a14ed, 20 );
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MD5_DO( F2, a, b, c, d, p_input[ 13 ] + 0xa9e3e905, 5 );
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MD5_DO( F2, d, a, b, c, p_input[ 2 ] + 0xfcefa3f8, 9 );
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MD5_DO( F2, c, d, a, b, p_input[ 7 ] + 0x676f02d9, 14 );
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MD5_DO( F2, b, c, d, a, p_input[ 12 ] + 0x8d2a4c8a, 20 );
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MD5_DO( F3, a, b, c, d, p_input[ 5 ] + 0xfffa3942, 4 );
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MD5_DO( F3, d, a, b, c, p_input[ 8 ] + 0x8771f681, 11 );
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MD5_DO( F3, c, d, a, b, p_input[ 11 ] + 0x6d9d6122, 16 );
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MD5_DO( F3, b, c, d, a, p_input[ 14 ] + 0xfde5380c, 23 );
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MD5_DO( F3, a, b, c, d, p_input[ 1 ] + 0xa4beea44, 4 );
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MD5_DO( F3, d, a, b, c, p_input[ 4 ] + 0x4bdecfa9, 11 );
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MD5_DO( F3, c, d, a, b, p_input[ 7 ] + 0xf6bb4b60, 16 );
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MD5_DO( F3, b, c, d, a, p_input[ 10 ] + 0xbebfbc70, 23 );
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MD5_DO( F3, a, b, c, d, p_input[ 13 ] + 0x289b7ec6, 4 );
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MD5_DO( F3, d, a, b, c, p_input[ 0 ] + 0xeaa127fa, 11 );
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MD5_DO( F3, c, d, a, b, p_input[ 3 ] + 0xd4ef3085, 16 );
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MD5_DO( F3, b, c, d, a, p_input[ 6 ] + 0x04881d05, 23 );
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MD5_DO( F3, a, b, c, d, p_input[ 9 ] + 0xd9d4d039, 4 );
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MD5_DO( F3, d, a, b, c, p_input[ 12 ] + 0xe6db99e5, 11 );
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MD5_DO( F3, c, d, a, b, p_input[ 15 ] + 0x1fa27cf8, 16 );
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MD5_DO( F3, b, c, d, a, p_input[ 2 ] + 0xc4ac5665, 23 );
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MD5_DO( F4, a, b, c, d, p_input[ 0 ] + 0xf4292244, 6 );
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MD5_DO( F4, d, a, b, c, p_input[ 7 ] + 0x432aff97, 10 );
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MD5_DO( F4, c, d, a, b, p_input[ 14 ] + 0xab9423a7, 15 );
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MD5_DO( F4, b, c, d, a, p_input[ 5 ] + 0xfc93a039, 21 );
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MD5_DO( F4, a, b, c, d, p_input[ 12 ] + 0x655b59c3, 6 );
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MD5_DO( F4, d, a, b, c, p_input[ 3 ] + 0x8f0ccc92, 10 );
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MD5_DO( F4, c, d, a, b, p_input[ 10 ] + 0xffeff47d, 15 );
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MD5_DO( F4, b, c, d, a, p_input[ 1 ] + 0x85845dd1, 21 );
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MD5_DO( F4, a, b, c, d, p_input[ 8 ] + 0x6fa87e4f, 6 );
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MD5_DO( F4, d, a, b, c, p_input[ 15 ] + 0xfe2ce6e0, 10 );
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MD5_DO( F4, c, d, a, b, p_input[ 6 ] + 0xa3014314, 15 );
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MD5_DO( F4, b, c, d, a, p_input[ 13 ] + 0x4e0811a1, 21 );
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MD5_DO( F4, a, b, c, d, p_input[ 4 ] + 0xf7537e82, 6 );
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MD5_DO( F4, d, a, b, c, p_input[ 11 ] + 0xbd3af235, 10 );
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MD5_DO( F4, c, d, a, b, p_input[ 2 ] + 0x2ad7d2bb, 15 );
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MD5_DO( F4, b, c, d, a, p_input[ 9 ] + 0xeb86d391, 21 );
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p_md5->p_digest[ 0 ] += a;
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p_md5->p_digest[ 1 ] += b;
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p_md5->p_digest[ 2 ] += c;
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p_md5->p_digest[ 3 ] += d;
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}
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/*****************************************************************************
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* InitMD5: initialise an MD5 message
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*****************************************************************************
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* The MD5 message-digest algorithm is described in RFC 1321
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*****************************************************************************/
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void InitMD5( struct md5_s *p_md5 )
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{
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p_md5->p_digest[ 0 ] = 0x67452301;
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p_md5->p_digest[ 1 ] = 0xefcdab89;
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p_md5->p_digest[ 2 ] = 0x98badcfe;
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p_md5->p_digest[ 3 ] = 0x10325476;
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rb->memset( p_md5->p_data, 0, 64 );
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p_md5->i_bits = 0;
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}
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/*****************************************************************************
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* AddMD5: add i_len bytes to an MD5 message
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*****************************************************************************/
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void AddMD5( struct md5_s *p_md5, const void *p_src, size_t i_len )
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{
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unsigned int i_current; /* Current bytes in the spare buffer */
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size_t i_offset = 0;
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i_current = (p_md5->i_bits / 8) & 63;
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p_md5->i_bits += 8 * i_len;
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/* If we can complete our spare buffer to 64 bytes, do it and add the
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* resulting buffer to the MD5 message */
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if( i_len >= (64 - i_current) )
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{
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rb->memcpy( ((uint8_t *)p_md5->p_data) + i_current, p_src,
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(64 - i_current) );
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DigestMD5( p_md5, p_md5->p_data );
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i_offset += (64 - i_current);
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i_len -= (64 - i_current);
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i_current = 0;
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}
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/* Add as many entire 64 bytes blocks as we can to the MD5 message */
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while( i_len >= 64 )
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{
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uint32_t p_tmp[ 16 ];
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rb->memcpy( p_tmp, ((const uint8_t *)p_src) + i_offset, 64 );
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DigestMD5( p_md5, p_tmp );
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i_offset += 64;
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i_len -= 64;
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}
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/* Copy our remaining data to the message's spare buffer */
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rb->memcpy( ((uint8_t *)p_md5->p_data) + i_current,
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((const uint8_t *)p_src) + i_offset, i_len );
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}
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/*****************************************************************************
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* EndMD5: finish an MD5 message
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*****************************************************************************
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* This function adds adequate padding to the end of the message, and appends
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* the bit count so that we end at a block boundary.
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*****************************************************************************/
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void EndMD5( struct md5_s *p_md5 )
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{
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unsigned int i_current;
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i_current = (p_md5->i_bits / 8) & 63;
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/* Append 0x80 to our buffer. No boundary check because the temporary
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* buffer cannot be full, otherwise AddMD5 would have emptied it. */
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((uint8_t *)p_md5->p_data)[ i_current++ ] = 0x80;
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/* If less than 8 bytes are available at the end of the block, complete
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* this 64 bytes block with zeros and add it to the message. We'll add
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* our length at the end of the next block. */
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if( i_current > 56 )
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{
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rb->memset( ((uint8_t *)p_md5->p_data) + i_current, 0, (64 - i_current) );
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DigestMD5( p_md5, p_md5->p_data );
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i_current = 0;
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}
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/* Fill the unused space in our last block with zeroes and put the
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* message length at the end. */
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rb->memset( ((uint8_t *)p_md5->p_data) + i_current, 0, (56 - i_current) );
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p_md5->p_data[ 14 ] = p_md5->i_bits & 0xffffffff;
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p_md5->p_data[ 15 ] = (p_md5->i_bits >> 32);
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REVERSE( &p_md5->p_data[ 14 ], 2 );
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DigestMD5( p_md5, p_md5->p_data );
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}
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void psz_md5_hash( char *psz, struct md5_s *md5_s )
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{
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int i;
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for ( i = 0; i < 4; i++ )
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{
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rb->snprintf( &psz[8*i], 9, "%02x%02x%02x%02x",
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(unsigned int)(md5_s->p_digest[i] & 0xff),
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(unsigned int)(( md5_s->p_digest[i] >> 8 ) & 0xff),
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(unsigned int)(( md5_s->p_digest[i] >> 16 ) & 0xff),
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(unsigned int)(md5_s->p_digest[i] >> 24)
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);
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}
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}
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