src/xyssl/library/md2.c

   1 /*
   2  *  RFC 1115/1319 compliant MD2 implementation
   3  *
   4  *  Copyright (C) 2006-2007  Christophe Devine
   5  *
   6  *  This library is free software; you can redistribute it and/or
   7  *  modify it under the terms of the GNU Lesser General Public
   8  *  License, version 2.1 as published by the Free Software Foundation.
   9  *
  10  *  This library is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  *  Lesser General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU Lesser General Public
  16  *  License along with this library; if not, write to the Free Software
  17  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  18  *  MA  02110-1301  USA
  19  */
  20 /*
  21  *  The MD2 algorithm was designed by Ron Rivest in 1989.
  22  *
  23  *  http://www.ietf.org/rfc/rfc1115.txt
  24  *  http://www.ietf.org/rfc/rfc1319.txt
  25  */
  26
  27 #include "xyssl/config.h"
  28
  29 #if defined(XYSSL_MD2_C)
  30
  31 #include "xyssl/md2.h"
  32
  33 #include <string.h>
  34 #include <stdio.h>
  35
  36 static const unsigned char PI_SUBST[256] =
  37 {
  38     0x29, 0x2E, 0x43, 0xC9, 0xA2, 0xD8, 0x7C, 0x01, 0x3D, 0x36,
  39     0x54, 0xA1, 0xEC, 0xF0, 0x06, 0x13, 0x62, 0xA7, 0x05, 0xF3,
  40     0xC0, 0xC7, 0x73, 0x8C, 0x98, 0x93, 0x2B, 0xD9, 0xBC, 0x4C,
  41     0x82, 0xCA, 0x1E, 0x9B, 0x57, 0x3C, 0xFD, 0xD4, 0xE0, 0x16,
  42     0x67, 0x42, 0x6F, 0x18, 0x8A, 0x17, 0xE5, 0x12, 0xBE, 0x4E,
  43     0xC4, 0xD6, 0xDA, 0x9E, 0xDE, 0x49, 0xA0, 0xFB, 0xF5, 0x8E,
  44     0xBB, 0x2F, 0xEE, 0x7A, 0xA9, 0x68, 0x79, 0x91, 0x15, 0xB2,
  45     0x07, 0x3F, 0x94, 0xC2, 0x10, 0x89, 0x0B, 0x22, 0x5F, 0x21,
  46     0x80, 0x7F, 0x5D, 0x9A, 0x5A, 0x90, 0x32, 0x27, 0x35, 0x3E,
  47     0xCC, 0xE7, 0xBF, 0xF7, 0x97, 0x03, 0xFF, 0x19, 0x30, 0xB3,
  48     0x48, 0xA5, 0xB5, 0xD1, 0xD7, 0x5E, 0x92, 0x2A, 0xAC, 0x56,
  49     0xAA, 0xC6, 0x4F, 0xB8, 0x38, 0xD2, 0x96, 0xA4, 0x7D, 0xB6,
  50     0x76, 0xFC, 0x6B, 0xE2, 0x9C, 0x74, 0x04, 0xF1, 0x45, 0x9D,
  51     0x70, 0x59, 0x64, 0x71, 0x87, 0x20, 0x86, 0x5B, 0xCF, 0x65,
  52     0xE6, 0x2D, 0xA8, 0x02, 0x1B, 0x60, 0x25, 0xAD, 0xAE, 0xB0,
  53     0xB9, 0xF6, 0x1C, 0x46, 0x61, 0x69, 0x34, 0x40, 0x7E, 0x0F,
  54     0x55, 0x47, 0xA3, 0x23, 0xDD, 0x51, 0xAF, 0x3A, 0xC3, 0x5C,
  55     0xF9, 0xCE, 0xBA, 0xC5, 0xEA, 0x26, 0x2C, 0x53, 0x0D, 0x6E,
  56     0x85, 0x28, 0x84, 0x09, 0xD3, 0xDF, 0xCD, 0xF4, 0x41, 0x81,
  57     0x4D, 0x52, 0x6A, 0xDC, 0x37, 0xC8, 0x6C, 0xC1, 0xAB, 0xFA,
  58     0x24, 0xE1, 0x7B, 0x08, 0x0C, 0xBD, 0xB1, 0x4A, 0x78, 0x88,
  59     0x95, 0x8B, 0xE3, 0x63, 0xE8, 0x6D, 0xE9, 0xCB, 0xD5, 0xFE,
  60     0x3B, 0x00, 0x1D, 0x39, 0xF2, 0xEF, 0xB7, 0x0E, 0x66, 0x58,
  61     0xD0, 0xE4, 0xA6, 0x77, 0x72, 0xF8, 0xEB, 0x75, 0x4B, 0x0A,
  62     0x31, 0x44, 0x50, 0xB4, 0x8F, 0xED, 0x1F, 0x1A, 0xDB, 0x99,
  63     0x8D, 0x33, 0x9F, 0x11, 0x83, 0x14
  64 };
  65
  66 /*
  67  * MD2 context setup
  68  */
  69 void md2_starts( md2_context *ctx )
  70 {
  71     memset( ctx, 0, sizeof( md2_context ) );
  72 }
  73
  74 static void md2_process( md2_context *ctx )
  75 {
  76     int i, j;
  77     unsigned char t = 0;
  78
  79     for( i = 0; i < 16; i++ )
  80     {
  81         ctx->state[i + 16] = ctx->buffer[i];
  82         ctx->state[i + 32] =
  83             (unsigned char)( ctx->buffer[i] ^ ctx->state[i]);
  84     }
  85
  86     for( i = 0; i < 18; i++ )
  87     {
  88         for( j = 0; j < 48; j++ )
  89         {
  90             ctx->state[j] = (unsigned char)
  91                ( ctx->state[j] ^ PI_SUBST[t] );
  92             t  = ctx->state[j];
  93         }
  94
  95         t = (unsigned char)( t + i );
  96     }
  97
  98     t = ctx->cksum[15];
  99
 100     for( i = 0; i < 16; i++ )
 101     {
 102         ctx->cksum[i] = (unsigned char)
 103            ( ctx->cksum[i] ^ PI_SUBST[ctx->buffer[i] ^ t] );
 104         t  = ctx->cksum[i];
 105     }
 106 }
 107
 108 /*
 109  * MD2 process buffer
 110  */
 111 void md2_update( md2_context *ctx, unsigned char *input, int ilen )
 112 {
 113     int fill;
 114
 115     while( ilen > 0 )
 116     {
 117         if( ctx->left + ilen > 16 )
 118             fill = 16 - ctx->left;
 119         else
 120             fill = ilen;
 121
 122         memcpy( ctx->buffer + ctx->left, input, fill );
 123
 124         ctx->left += fill;
 125         input += fill;
 126         ilen  -= fill;
 127
 128         if( ctx->left == 16 )
 129         {
 130             ctx->left = 0;
 131             md2_process( ctx );
 132         }
 133     }
 134 }
 135
 136 /*
 137  * MD2 final digest
 138  */
 139 void md2_finish( md2_context *ctx, unsigned char output[16] )
 140 {
 141     int i;
 142     unsigned char x;
 143
 144     x = (unsigned char)( 16 - ctx->left );
 145
 146     for( i = ctx->left; i < 16; i++ )
 147         ctx->buffer[i] = x;
 148
 149     md2_process( ctx );
 150
 151     memcpy( ctx->buffer, ctx->cksum, 16 );
 152     md2_process( ctx );
 153
 154     memcpy( output, ctx->state, 16 );
 155 }
 156
 157 /*
 158  * output = MD2( input buffer )
 159  */
 160 void md2( unsigned char *input, int ilen, unsigned char output[16] )
 161 {
 162     md2_context ctx;
 163
 164     md2_starts( &ctx );
 165     md2_update( &ctx, input, ilen );
 166     md2_finish( &ctx, output );
 167
 168     memset( &ctx, 0, sizeof( md2_context ) );
 169 }
 170
 171 /*
 172  * output = MD2( file contents )
 173  */
 174 int md2_file( char *path, unsigned char output[16] )
 175 {
 176     FILE *f;
 177     size_t n;
 178     md2_context ctx;
 179     unsigned char buf[1024];
 180
 181     if( ( f = fopen( path, "rb" ) ) == NULL )
 182         return( 1 );
 183
 184     md2_starts( &ctx );
 185
 186     while( ( n = fread( buf, 1, sizeof( buf ), f ) ) > 0 )
 187         md2_update( &ctx, buf, (int) n );
 188
 189     md2_finish( &ctx, output );
 190
 191     memset( &ctx, 0, sizeof( md2_context ) );
 192
 193     if( ferror( f ) != 0 )
 194     {
 195         fclose( f );
 196         return( 2 );
 197     }
 198
 199     fclose( f );
 200     return( 0 );
 201 }
 202
 203 /*
 204  * MD2 HMAC context setup
 205  */
 206 void md2_hmac_starts( md2_context *ctx, unsigned char *key, int keylen )
 207 {
 208     int i;
 209     unsigned char sum[16];
 210
 211     if( keylen > 64 )
 212     {
 213         md2( key, keylen, sum );
 214         keylen = 16;
 215         key = sum;
 216     }
 217
 218     memset( ctx->ipad, 0x36, 64 );
 219     memset( ctx->opad, 0x5C, 64 );
 220
 221     for( i = 0; i < keylen; i++ )
 222     {
 223         ctx->ipad[i] = (unsigned char)( ctx->ipad[i] ^ key[i] );
 224         ctx->opad[i] = (unsigned char)( ctx->opad[i] ^ key[i] );
 225     }
 226
 227     md2_starts( ctx );
 228     md2_update( ctx, ctx->ipad, 64 );
 229
 230     memset( sum, 0, sizeof( sum ) );
 231 }
 232
 233 /*
 234  * MD2 HMAC process buffer
 235  */
 236 void md2_hmac_update( md2_context *ctx, unsigned char *input, int ilen )
 237 {
 238     md2_update( ctx, input, ilen );
 239 }
 240
 241 /*
 242  * MD2 HMAC final digest
 243  */
 244 void md2_hmac_finish( md2_context *ctx, unsigned char output[16] )
 245 {
 246     unsigned char tmpbuf[16];
 247
 248     md2_finish( ctx, tmpbuf );
 249     md2_starts( ctx );
 250     md2_update( ctx, ctx->opad, 64 );
 251     md2_update( ctx, tmpbuf, 16 );
 252     md2_finish( ctx, output );
 253
 254     memset( tmpbuf, 0, sizeof( tmpbuf ) );
 255 }
 256
 257 /*
 258  * output = HMAC-MD2( hmac key, input buffer )
 259  */
 260 void md2_hmac( unsigned char *key, int keylen, unsigned char *input, int ilen,
 261                unsigned char output[16] )
 262 {
 263     md2_context ctx;
 264
 265     md2_hmac_starts( &ctx, key, keylen );
 266     md2_hmac_update( &ctx, input, ilen );
 267     md2_hmac_finish( &ctx, output );
 268
 269     memset( &ctx, 0, sizeof( md2_context ) );
 270 }
 271
 272 #if defined(XYSSL_SELF_TEST)
 273
 274 /*
 275  * RFC 1319 test vectors
 276  */
 277 static const char md2_test_str[7][81] =
 278 {
 279     { "" },
 280     { "a" },
 281     { "abc" },
 282     { "message digest" },
 283     { "abcdefghijklmnopqrstuvwxyz" },
 284     { "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789" },
 285     { "12345678901234567890123456789012345678901234567890123456789012" \
 286       "345678901234567890" }
 287 };
 288
 289 static const unsigned char md2_test_sum[7][16] =
 290 {
 291     { 0x83, 0x50, 0xE5, 0xA3, 0xE2, 0x4C, 0x15, 0x3D,
 292       0xF2, 0x27, 0x5C, 0x9F, 0x80, 0x69, 0x27, 0x73 },
 293     { 0x32, 0xEC, 0x01, 0xEC, 0x4A, 0x6D, 0xAC, 0x72,
 294       0xC0, 0xAB, 0x96, 0xFB, 0x34, 0xC0, 0xB5, 0xD1 },
 295     { 0xDA, 0x85, 0x3B, 0x0D, 0x3F, 0x88, 0xD9, 0x9B,
 296       0x30, 0x28, 0x3A, 0x69, 0xE6, 0xDE, 0xD6, 0xBB },
 297     { 0xAB, 0x4F, 0x49, 0x6B, 0xFB, 0x2A, 0x53, 0x0B,
 298       0x21, 0x9F, 0xF3, 0x30, 0x31, 0xFE, 0x06, 0xB0 },
 299     { 0x4E, 0x8D, 0xDF, 0xF3, 0x65, 0x02, 0x92, 0xAB,
 300       0x5A, 0x41, 0x08, 0xC3, 0xAA, 0x47, 0x94, 0x0B },
 301     { 0xDA, 0x33, 0xDE, 0xF2, 0xA4, 0x2D, 0xF1, 0x39,
 302       0x75, 0x35, 0x28, 0x46, 0xC3, 0x03, 0x38, 0xCD },
 303     { 0xD5, 0x97, 0x6F, 0x79, 0xD8, 0x3D, 0x3A, 0x0D,
 304       0xC9, 0x80, 0x6C, 0x3C, 0x66, 0xF3, 0xEF, 0xD8 }
 305 };
 306
 307 /*
 308  * Checkup routine
 309  */
 310 int md2_self_test( int verbose )
 311 {
 312     int i;
 313     unsigned char md2sum[16];
 314
 315     for( i = 0; i < 7; i++ )
 316     {
 317         if( verbose != 0 )
 318             printf( "  MD2 test #%d: ", i + 1 );
 319
 320         md2( (unsigned char *) md2_test_str[i],
 321              strlen( md2_test_str[i] ), md2sum );
 322
 323         if( memcmp( md2sum, md2_test_sum[i], 16 ) != 0 )
 324         {
 325             if( verbose != 0 )
 326                 printf( "failed\n" );
 327
 328             return( 1 );
 329         }
 330
 331         if( verbose != 0 )
 332             printf( "passed\n" );
 333     }
 334
 335     if( verbose != 0 )
 336         printf( "\n" );
 337
 338     return( 0 );
 339 }
 340
 341 #endif
 342
 343 #endif