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  1. /*
  2.  *  RFC 1115/1319 compliant MD2 implementation
  3.  *
  4.  *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
  5.  *  SPDX-License-Identifier: GPL-2.0
  6.  *
  7.  *  This program is free software; you can redistribute it and/or modify
  8.  *  it under the terms of the GNU General Public License as published by
  9.  *  the Free Software Foundation; either version 2 of the License, or
  10.  *  (at your option) any later version.
  11.  *
  12.  *  This program is distributed in the hope that it will be useful,
  13.  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15.  *  GNU General Public License for more details.
  16.  *
  17.  *  You should have received a copy of the GNU General Public License along
  18.  *  with this program; if not, write to the Free Software Foundation, Inc.,
  19.  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20.  *
  21.  *  This file is part of mbed TLS (https://tls.mbed.org)
  22.  */
  23. /*
  24.  *  The MD2 algorithm was designed by Ron Rivest in 1989.
  25.  *
  26.  *  http://www.ietf.org/rfc/rfc1115.txt
  27.  *  http://www.ietf.org/rfc/rfc1319.txt
  28.  */
  29.  
  30. #if !defined(MBEDTLS_CONFIG_FILE)
  31. #include "mbedtls/config.h"
  32. #else
  33. #include MBEDTLS_CONFIG_FILE
  34. #endif
  35.  
  36. #if defined(MBEDTLS_MD2_C)
  37.  
  38. #include "mbedtls/md2.h"
  39. #include "mbedtls/platform_util.h"
  40.  
  41. #include <string.h>
  42.  
  43. #if defined(MBEDTLS_SELF_TEST)
  44. #if defined(MBEDTLS_PLATFORM_C)
  45. #include "mbedtls/platform.h"
  46. #else
  47. #include <stdio.h>
  48. #define mbedtls_printf printf
  49. #endif /* MBEDTLS_PLATFORM_C */
  50. #endif /* MBEDTLS_SELF_TEST */
  51.  
  52. #if !defined(MBEDTLS_MD2_ALT)
  53.  
  54. static const unsigned char PI_SUBST[256] =
  55. {
  56.     0x29, 0x2E, 0x43, 0xC9, 0xA2, 0xD8, 0x7C, 0x01, 0x3D, 0x36,
  57.     0x54, 0xA1, 0xEC, 0xF0, 0x06, 0x13, 0x62, 0xA7, 0x05, 0xF3,
  58.     0xC0, 0xC7, 0x73, 0x8C, 0x98, 0x93, 0x2B, 0xD9, 0xBC, 0x4C,
  59.     0x82, 0xCA, 0x1E, 0x9B, 0x57, 0x3C, 0xFD, 0xD4, 0xE0, 0x16,
  60.     0x67, 0x42, 0x6F, 0x18, 0x8A, 0x17, 0xE5, 0x12, 0xBE, 0x4E,
  61.     0xC4, 0xD6, 0xDA, 0x9E, 0xDE, 0x49, 0xA0, 0xFB, 0xF5, 0x8E,
  62.     0xBB, 0x2F, 0xEE, 0x7A, 0xA9, 0x68, 0x79, 0x91, 0x15, 0xB2,
  63.     0x07, 0x3F, 0x94, 0xC2, 0x10, 0x89, 0x0B, 0x22, 0x5F, 0x21,
  64.     0x80, 0x7F, 0x5D, 0x9A, 0x5A, 0x90, 0x32, 0x27, 0x35, 0x3E,
  65.     0xCC, 0xE7, 0xBF, 0xF7, 0x97, 0x03, 0xFF, 0x19, 0x30, 0xB3,
  66.     0x48, 0xA5, 0xB5, 0xD1, 0xD7, 0x5E, 0x92, 0x2A, 0xAC, 0x56,
  67.     0xAA, 0xC6, 0x4F, 0xB8, 0x38, 0xD2, 0x96, 0xA4, 0x7D, 0xB6,
  68.     0x76, 0xFC, 0x6B, 0xE2, 0x9C, 0x74, 0x04, 0xF1, 0x45, 0x9D,
  69.     0x70, 0x59, 0x64, 0x71, 0x87, 0x20, 0x86, 0x5B, 0xCF, 0x65,
  70.     0xE6, 0x2D, 0xA8, 0x02, 0x1B, 0x60, 0x25, 0xAD, 0xAE, 0xB0,
  71.     0xB9, 0xF6, 0x1C, 0x46, 0x61, 0x69, 0x34, 0x40, 0x7E, 0x0F,
  72.     0x55, 0x47, 0xA3, 0x23, 0xDD, 0x51, 0xAF, 0x3A, 0xC3, 0x5C,
  73.     0xF9, 0xCE, 0xBA, 0xC5, 0xEA, 0x26, 0x2C, 0x53, 0x0D, 0x6E,
  74.     0x85, 0x28, 0x84, 0x09, 0xD3, 0xDF, 0xCD, 0xF4, 0x41, 0x81,
  75.     0x4D, 0x52, 0x6A, 0xDC, 0x37, 0xC8, 0x6C, 0xC1, 0xAB, 0xFA,
  76.     0x24, 0xE1, 0x7B, 0x08, 0x0C, 0xBD, 0xB1, 0x4A, 0x78, 0x88,
  77.     0x95, 0x8B, 0xE3, 0x63, 0xE8, 0x6D, 0xE9, 0xCB, 0xD5, 0xFE,
  78.     0x3B, 0x00, 0x1D, 0x39, 0xF2, 0xEF, 0xB7, 0x0E, 0x66, 0x58,
  79.     0xD0, 0xE4, 0xA6, 0x77, 0x72, 0xF8, 0xEB, 0x75, 0x4B, 0x0A,
  80.     0x31, 0x44, 0x50, 0xB4, 0x8F, 0xED, 0x1F, 0x1A, 0xDB, 0x99,
  81.     0x8D, 0x33, 0x9F, 0x11, 0x83, 0x14
  82. };
  83.  
  84. void mbedtls_md2_init( mbedtls_md2_context *ctx )
  85. {
  86.     memset( ctx, 0, sizeof( mbedtls_md2_context ) );
  87. }
  88.  
  89. void mbedtls_md2_free( mbedtls_md2_context *ctx )
  90. {
  91.     if( ctx == NULL )
  92.         return;
  93.  
  94.     mbedtls_platform_zeroize( ctx, sizeof( mbedtls_md2_context ) );
  95. }
  96.  
  97. void mbedtls_md2_clone( mbedtls_md2_context *dst,
  98.                         const mbedtls_md2_context *src )
  99. {
  100.     *dst = *src;
  101. }
  102.  
  103. /*
  104.  * MD2 context setup
  105.  */
  106. int mbedtls_md2_starts_ret( mbedtls_md2_context *ctx )
  107. {
  108.     memset( ctx->cksum, 0, 16 );
  109.     memset( ctx->state, 0, 46 );
  110.     memset( ctx->buffer, 0, 16 );
  111.     ctx->left = 0;
  112.  
  113.     return( 0 );
  114. }
  115.  
  116. #if !defined(MBEDTLS_DEPRECATED_REMOVED)
  117. void mbedtls_md2_starts( mbedtls_md2_context *ctx )
  118. {
  119.     mbedtls_md2_starts_ret( ctx );
  120. }
  121. #endif
  122.  
  123. #if !defined(MBEDTLS_MD2_PROCESS_ALT)
  124. int mbedtls_internal_md2_process( mbedtls_md2_context *ctx )
  125. {
  126.     int i, j;
  127.     unsigned char t = 0;
  128.  
  129.     for( i = 0; i < 16; i++ )
  130.     {
  131.         ctx->state[i + 16] = ctx->buffer[i];
  132.         ctx->state[i + 32] =
  133.             (unsigned char)( ctx->buffer[i] ^ ctx->state[i]);
  134.     }
  135.  
  136.     for( i = 0; i < 18; i++ )
  137.     {
  138.         for( j = 0; j < 48; j++ )
  139.         {
  140.             ctx->state[j] = (unsigned char)
  141.                ( ctx->state[j] ^ PI_SUBST[t] );
  142.             t  = ctx->state[j];
  143.         }
  144.  
  145.         t = (unsigned char)( t + i );
  146.     }
  147.  
  148.     t = ctx->cksum[15];
  149.  
  150.     for( i = 0; i < 16; i++ )
  151.     {
  152.         ctx->cksum[i] = (unsigned char)
  153.            ( ctx->cksum[i] ^ PI_SUBST[ctx->buffer[i] ^ t] );
  154.         t  = ctx->cksum[i];
  155.     }
  156.  
  157.     return( 0 );
  158. }
  159.  
  160. #if !defined(MBEDTLS_DEPRECATED_REMOVED)
  161. void mbedtls_md2_process( mbedtls_md2_context *ctx )
  162. {
  163.     mbedtls_internal_md2_process( ctx );
  164. }
  165. #endif
  166. #endif /* !MBEDTLS_MD2_PROCESS_ALT */
  167.  
  168. /*
  169.  * MD2 process buffer
  170.  */
  171. int mbedtls_md2_update_ret( mbedtls_md2_context *ctx,
  172.                             const unsigned char *input,
  173.                             size_t ilen )
  174. {
  175.     int ret;
  176.     size_t fill;
  177.  
  178.     while( ilen > 0 )
  179.     {
  180.         if( ilen > 16 - ctx->left )
  181.             fill = 16 - ctx->left;
  182.         else
  183.             fill = ilen;
  184.  
  185.         memcpy( ctx->buffer + ctx->left, input, fill );
  186.  
  187.         ctx->left += fill;
  188.         input += fill;
  189.         ilen  -= fill;
  190.  
  191.         if( ctx->left == 16 )
  192.         {
  193.             ctx->left = 0;
  194.             if( ( ret = mbedtls_internal_md2_process( ctx ) ) != 0 )
  195.                 return( ret );
  196.         }
  197.     }
  198.  
  199.     return( 0 );
  200. }
  201.  
  202. #if !defined(MBEDTLS_DEPRECATED_REMOVED)
  203. void mbedtls_md2_update( mbedtls_md2_context *ctx,
  204.                          const unsigned char *input,
  205.                          size_t ilen )
  206. {
  207.     mbedtls_md2_update_ret( ctx, input, ilen );
  208. }
  209. #endif
  210.  
  211. /*
  212.  * MD2 final digest
  213.  */
  214. int mbedtls_md2_finish_ret( mbedtls_md2_context *ctx,
  215.                             unsigned char output[16] )
  216. {
  217.     int ret;
  218.     size_t i;
  219.     unsigned char x;
  220.  
  221.     x = (unsigned char)( 16 - ctx->left );
  222.  
  223.     for( i = ctx->left; i < 16; i++ )
  224.         ctx->buffer[i] = x;
  225.  
  226.     if( ( ret = mbedtls_internal_md2_process( ctx ) ) != 0 )
  227.         return( ret );
  228.  
  229.     memcpy( ctx->buffer, ctx->cksum, 16 );
  230.     if( ( ret = mbedtls_internal_md2_process( ctx ) ) != 0 )
  231.         return( ret );
  232.  
  233.     memcpy( output, ctx->state, 16 );
  234.  
  235.     return( 0 );
  236. }
  237.  
  238. #if !defined(MBEDTLS_DEPRECATED_REMOVED)
  239. void mbedtls_md2_finish( mbedtls_md2_context *ctx,
  240.                          unsigned char output[16] )
  241. {
  242.     mbedtls_md2_finish_ret( ctx, output );
  243. }
  244. #endif
  245.  
  246. #endif /* !MBEDTLS_MD2_ALT */
  247.  
  248. /*
  249.  * output = MD2( input buffer )
  250.  */
  251. int mbedtls_md2_ret( const unsigned char *input,
  252.                      size_t ilen,
  253.                      unsigned char output[16] )
  254. {
  255.     int ret;
  256.     mbedtls_md2_context ctx;
  257.  
  258.     mbedtls_md2_init( &ctx );
  259.  
  260.     if( ( ret = mbedtls_md2_starts_ret( &ctx ) ) != 0 )
  261.         goto exit;
  262.  
  263.     if( ( ret = mbedtls_md2_update_ret( &ctx, input, ilen ) ) != 0 )
  264.         goto exit;
  265.  
  266.     if( ( ret = mbedtls_md2_finish_ret( &ctx, output ) ) != 0 )
  267.         goto exit;
  268.  
  269. exit:
  270.     mbedtls_md2_free( &ctx );
  271.  
  272.     return( ret );
  273. }
  274.  
  275. #if !defined(MBEDTLS_DEPRECATED_REMOVED)
  276. void mbedtls_md2( const unsigned char *input,
  277.                   size_t ilen,
  278.                   unsigned char output[16] )
  279. {
  280.     mbedtls_md2_ret( input, ilen, output );
  281. }
  282. #endif
  283.  
  284. #if defined(MBEDTLS_SELF_TEST)
  285.  
  286. /*
  287.  * RFC 1319 test vectors
  288.  */
  289. static const unsigned char md2_test_str[7][81] =
  290. {
  291.     { "" },
  292.     { "a" },
  293.     { "abc" },
  294.     { "message digest" },
  295.     { "abcdefghijklmnopqrstuvwxyz" },
  296.     { "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789" },
  297.     { "12345678901234567890123456789012345678901234567890123456789012"
  298.       "345678901234567890" }
  299. };
  300.  
  301. static const size_t md2_test_strlen[7] =
  302. {
  303.     0, 1, 3, 14, 26, 62, 80
  304. };
  305.  
  306. static const unsigned char md2_test_sum[7][16] =
  307. {
  308.     { 0x83, 0x50, 0xE5, 0xA3, 0xE2, 0x4C, 0x15, 0x3D,
  309.       0xF2, 0x27, 0x5C, 0x9F, 0x80, 0x69, 0x27, 0x73 },
  310.     { 0x32, 0xEC, 0x01, 0xEC, 0x4A, 0x6D, 0xAC, 0x72,
  311.       0xC0, 0xAB, 0x96, 0xFB, 0x34, 0xC0, 0xB5, 0xD1 },
  312.     { 0xDA, 0x85, 0x3B, 0x0D, 0x3F, 0x88, 0xD9, 0x9B,
  313.       0x30, 0x28, 0x3A, 0x69, 0xE6, 0xDE, 0xD6, 0xBB },
  314.     { 0xAB, 0x4F, 0x49, 0x6B, 0xFB, 0x2A, 0x53, 0x0B,
  315.       0x21, 0x9F, 0xF3, 0x30, 0x31, 0xFE, 0x06, 0xB0 },
  316.     { 0x4E, 0x8D, 0xDF, 0xF3, 0x65, 0x02, 0x92, 0xAB,
  317.       0x5A, 0x41, 0x08, 0xC3, 0xAA, 0x47, 0x94, 0x0B },
  318.     { 0xDA, 0x33, 0xDE, 0xF2, 0xA4, 0x2D, 0xF1, 0x39,
  319.       0x75, 0x35, 0x28, 0x46, 0xC3, 0x03, 0x38, 0xCD },
  320.     { 0xD5, 0x97, 0x6F, 0x79, 0xD8, 0x3D, 0x3A, 0x0D,
  321.       0xC9, 0x80, 0x6C, 0x3C, 0x66, 0xF3, 0xEF, 0xD8 }
  322. };
  323.  
  324. /*
  325.  * Checkup routine
  326.  */
  327. int mbedtls_md2_self_test( int verbose )
  328. {
  329.     int i, ret = 0;
  330.     unsigned char md2sum[16];
  331.  
  332.     for( i = 0; i < 7; i++ )
  333.     {
  334.         if( verbose != 0 )
  335.             mbedtls_printf( "  MD2 test #%d: ", i + 1 );
  336.  
  337.         ret = mbedtls_md2_ret( md2_test_str[i], md2_test_strlen[i], md2sum );
  338.         if( ret != 0 )
  339.             goto fail;
  340.  
  341.         if( memcmp( md2sum, md2_test_sum[i], 16 ) != 0 )
  342.         {
  343.             ret = 1;
  344.             goto fail;
  345.         }
  346.  
  347.         if( verbose != 0 )
  348.             mbedtls_printf( "passed\n" );
  349.     }
  350.  
  351.     if( verbose != 0 )
  352.         mbedtls_printf( "\n" );
  353.  
  354.     return( 0 );
  355.  
  356. fail:
  357.     if( verbose != 0 )
  358.         mbedtls_printf( "failed\n" );
  359.  
  360.     return( ret );
  361. }
  362.  
  363. #endif /* MBEDTLS_SELF_TEST */
  364.  
  365. #endif /* MBEDTLS_MD2_C */
  366.