library/md5.c - security/mbedtls - Rivoreo Source Code Repositories

 /*
  *  RFC 1321 compliant MD5 implementation
  *
  *  Based on XySSL: Copyright (C) 2006-2008  Christophe Devine
  *
  *  Copyright (C) 2009  Paul Bakker <polarssl_maintainer at polarssl dot org>
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
  *  the Free Software Foundation; either version 2 of the License, or
  *  (at your option) any later version.
  *
  *  This program is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *  GNU General Public License for more details.
  *
  *  You should have received a copy of the GNU General Public License along
  *  with this program; if not, write to the Free Software Foundation, Inc.,
  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 /*
  *  The MD5 algorithm was designed by Ron Rivest in 1991.
  *
  *  http://www.ietf.org/rfc/rfc1321.txt
  */

 #include "polarssl/config.h"

 #if defined(POLARSSL_MD5_C)

 #include "polarssl/md5.h"

 #include <string.h>
 #include <stdio.h>

 /*
  * 32-bit integer manipulation macros (little endian)
  */
 #ifndef GET_ULONG_LE
 #define GET_ULONG_LE(n,b,i)                             \
 {                                                       \
     (n) = ( (unsigned long) (b)[(i)    ]       )        \
         | ( (unsigned long) (b)[(i) + 1] <<  8 )        \
         | ( (unsigned long) (b)[(i) + 2] << 16 )        \
         | ( (unsigned long) (b)[(i) + 3] << 24 );       \
 }
 #endif

 #ifndef PUT_ULONG_LE
 #define PUT_ULONG_LE(n,b,i)                             \
 {                                                       \
     (b)[(i)    ] = (unsigned char) ( (n)       );       \
     (b)[(i) + 1] = (unsigned char) ( (n) >>  8 );       \
     (b)[(i) + 2] = (unsigned char) ( (n) >> 16 );       \
     (b)[(i) + 3] = (unsigned char) ( (n) >> 24 );       \
 }
 #endif

 /*
  * MD5 context setup
  */
 void md5_starts( md5_context *ctx )
 {
     ctx->total[0] = 0;
     ctx->total[1] = 0;

     ctx->state[0] = 0x67452301;
     ctx->state[1] = 0xEFCDAB89;
     ctx->state[2] = 0x98BADCFE;
     ctx->state[3] = 0x10325476;
 }

 static void md5_process( md5_context *ctx, unsigned char data[64] )
 {
     unsigned long X[16], A, B, C, D;

     GET_ULONG_LE( X[ 0], data,  0 );
     GET_ULONG_LE( X[ 1], data,  4 );
     GET_ULONG_LE( X[ 2], data,  8 );
     GET_ULONG_LE( X[ 3], data, 12 );
     GET_ULONG_LE( X[ 4], data, 16 );
     GET_ULONG_LE( X[ 5], data, 20 );
     GET_ULONG_LE( X[ 6], data, 24 );
     GET_ULONG_LE( X[ 7], data, 28 );
     GET_ULONG_LE( X[ 8], data, 32 );
     GET_ULONG_LE( X[ 9], data, 36 );
     GET_ULONG_LE( X[10], data, 40 );
     GET_ULONG_LE( X[11], data, 44 );
     GET_ULONG_LE( X[12], data, 48 );
     GET_ULONG_LE( X[13], data, 52 );
     GET_ULONG_LE( X[14], data, 56 );
     GET_ULONG_LE( X[15], data, 60 );

 #define S(x,n) ((x << n) | ((x & 0xFFFFFFFF) >> (32 - n)))

 #define P(a,b,c,d,k,s,t)                                \
 {                                                       \
     a += F(b,c,d) + X[k] + t; a = S(a,s) + b;           \
 }

     A = ctx->state[0];
     B = ctx->state[1];
     C = ctx->state[2];
     D = ctx->state[3];

 #define F(x,y,z) (z ^ (x & (y ^ z)))

     P( A, B, C, D,  0,  7, 0xD76AA478 );
     P( D, A, B, C,  1, 12, 0xE8C7B756 );
     P( C, D, A, B,  2, 17, 0x242070DB );
     P( B, C, D, A,  3, 22, 0xC1BDCEEE );
     P( A, B, C, D,  4,  7, 0xF57C0FAF );
     P( D, A, B, C,  5, 12, 0x4787C62A );
     P( C, D, A, B,  6, 17, 0xA8304613 );
     P( B, C, D, A,  7, 22, 0xFD469501 );
     P( A, B, C, D,  8,  7, 0x698098D8 );
     P( D, A, B, C,  9, 12, 0x8B44F7AF );
     P( C, D, A, B, 10, 17, 0xFFFF5BB1 );
     P( B, C, D, A, 11, 22, 0x895CD7BE );
     P( A, B, C, D, 12,  7, 0x6B901122 );
     P( D, A, B, C, 13, 12, 0xFD987193 );
     P( C, D, A, B, 14, 17, 0xA679438E );
     P( B, C, D, A, 15, 22, 0x49B40821 );

 #undef F

 #define F(x,y,z) (y ^ (z & (x ^ y)))

     P( A, B, C, D,  1,  5, 0xF61E2562 );
     P( D, A, B, C,  6,  9, 0xC040B340 );
     P( C, D, A, B, 11, 14, 0x265E5A51 );
     P( B, C, D, A,  0, 20, 0xE9B6C7AA );
     P( A, B, C, D,  5,  5, 0xD62F105D );
     P( D, A, B, C, 10,  9, 0x02441453 );
     P( C, D, A, B, 15, 14, 0xD8A1E681 );
     P( B, C, D, A,  4, 20, 0xE7D3FBC8 );
     P( A, B, C, D,  9,  5, 0x21E1CDE6 );
     P( D, A, B, C, 14,  9, 0xC33707D6 );
     P( C, D, A, B,  3, 14, 0xF4D50D87 );
     P( B, C, D, A,  8, 20, 0x455A14ED );
     P( A, B, C, D, 13,  5, 0xA9E3E905 );
     P( D, A, B, C,  2,  9, 0xFCEFA3F8 );
     P( C, D, A, B,  7, 14, 0x676F02D9 );
     P( B, C, D, A, 12, 20, 0x8D2A4C8A );

 #undef F

 #define F(x,y,z) (x ^ y ^ z)

     P( A, B, C, D,  5,  4, 0xFFFA3942 );
     P( D, A, B, C,  8, 11, 0x8771F681 );
     P( C, D, A, B, 11, 16, 0x6D9D6122 );
     P( B, C, D, A, 14, 23, 0xFDE5380C );
     P( A, B, C, D,  1,  4, 0xA4BEEA44 );
     P( D, A, B, C,  4, 11, 0x4BDECFA9 );
     P( C, D, A, B,  7, 16, 0xF6BB4B60 );
     P( B, C, D, A, 10, 23, 0xBEBFBC70 );
     P( A, B, C, D, 13,  4, 0x289B7EC6 );
     P( D, A, B, C,  0, 11, 0xEAA127FA );
     P( C, D, A, B,  3, 16, 0xD4EF3085 );
     P( B, C, D, A,  6, 23, 0x04881D05 );
     P( A, B, C, D,  9,  4, 0xD9D4D039 );
     P( D, A, B, C, 12, 11, 0xE6DB99E5 );
     P( C, D, A, B, 15, 16, 0x1FA27CF8 );
     P( B, C, D, A,  2, 23, 0xC4AC5665 );

 #undef F

 #define F(x,y,z) (y ^ (x | ~z))

     P( A, B, C, D,  0,  6, 0xF4292244 );
     P( D, A, B, C,  7, 10, 0x432AFF97 );
     P( C, D, A, B, 14, 15, 0xAB9423A7 );
     P( B, C, D, A,  5, 21, 0xFC93A039 );
     P( A, B, C, D, 12,  6, 0x655B59C3 );
     P( D, A, B, C,  3, 10, 0x8F0CCC92 );
     P( C, D, A, B, 10, 15, 0xFFEFF47D );
     P( B, C, D, A,  1, 21, 0x85845DD1 );
     P( A, B, C, D,  8,  6, 0x6FA87E4F );
     P( D, A, B, C, 15, 10, 0xFE2CE6E0 );
     P( C, D, A, B,  6, 15, 0xA3014314 );
     P( B, C, D, A, 13, 21, 0x4E0811A1 );
     P( A, B, C, D,  4,  6, 0xF7537E82 );
     P( D, A, B, C, 11, 10, 0xBD3AF235 );
     P( C, D, A, B,  2, 15, 0x2AD7D2BB );
     P( B, C, D, A,  9, 21, 0xEB86D391 );

 #undef F

     ctx->state[0] += A;
     ctx->state[1] += B;
     ctx->state[2] += C;
     ctx->state[3] += D;
 }

 /*
  * MD5 process buffer
  */
 void md5_update( md5_context *ctx, unsigned char *input, int ilen )
 {
     int fill;
     unsigned long left;

     if( ilen <= 0 )
         return;

     left = ctx->total[0] & 0x3F;
     fill = 64 - left;

     ctx->total[0] += ilen;
     ctx->total[0] &= 0xFFFFFFFF;

     if( ctx->total[0] < (unsigned long) ilen )
         ctx->total[1]++;

     if( left && ilen >= fill )
     {
         memcpy( (void *) (ctx->buffer + left),
                 (void *) input, fill );
         md5_process( ctx, ctx->buffer );
         input += fill;
         ilen  -= fill;
         left = 0;
     }

     while( ilen >= 64 )
     {
         md5_process( ctx, input );
         input += 64;
         ilen  -= 64;
     }

     if( ilen > 0 )
     {
         memcpy( (void *) (ctx->buffer + left),
                 (void *) input, ilen );
     }
 }

 static const unsigned char md5_padding[64] =
 {
  0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
 };

 /*
  * MD5 final digest
  */
 void md5_finish( md5_context *ctx, unsigned char output[16] )
 {
     unsigned long last, padn;
     unsigned long high, low;
     unsigned char msglen[8];

     high = ( ctx->total[0] >> 29 )
          | ( ctx->total[1] <<  3 );
     low  = ( ctx->total[0] <<  3 );

     PUT_ULONG_LE( low,  msglen, 0 );
     PUT_ULONG_LE( high, msglen, 4 );

     last = ctx->total[0] & 0x3F;
     padn = ( last < 56 ) ? ( 56 - last ) : ( 120 - last );

     md5_update( ctx, (unsigned char *) md5_padding, padn );
     md5_update( ctx, msglen, 8 );

     PUT_ULONG_LE( ctx->state[0], output,  0 );
     PUT_ULONG_LE( ctx->state[1], output,  4 );
     PUT_ULONG_LE( ctx->state[2], output,  8 );
     PUT_ULONG_LE( ctx->state[3], output, 12 );
 }

 /*
  * output = MD5( input buffer )
  */
 void md5( unsigned char *input, int ilen, unsigned char output[16] )
 {
     md5_context ctx;

     md5_starts( &ctx );
     md5_update( &ctx, input, ilen );
     md5_finish( &ctx, output );

     memset( &ctx, 0, sizeof( md5_context ) );
 }

 /*
  * output = MD5( file contents )
  */
 int md5_file( char *path, unsigned char output[16] )
 {
     FILE *f;
     size_t n;
     md5_context ctx;
     unsigned char buf[1024];

     if( ( f = fopen( path, "rb" ) ) == NULL )
         return( 1 );

     md5_starts( &ctx );

     while( ( n = fread( buf, 1, sizeof( buf ), f ) ) > 0 )
         md5_update( &ctx, buf, (int) n );

     md5_finish( &ctx, output );

     memset( &ctx, 0, sizeof( md5_context ) );

     if( ferror( f ) != 0 )
     {
         fclose( f );
         return( 2 );
     }

     fclose( f );
     return( 0 );
 }

 /*
  * MD5 HMAC context setup
  */
 void md5_hmac_starts( md5_context *ctx, unsigned char *key, int keylen )
 {
     int i;
     unsigned char sum[16];

     if( keylen > 64 )
     {
         md5( key, keylen, sum );
         keylen = 16;
         key = sum;
     }

     memset( ctx->ipad, 0x36, 64 );
     memset( ctx->opad, 0x5C, 64 );

     for( i = 0; i < keylen; i++ )
     {
         ctx->ipad[i] = (unsigned char)( ctx->ipad[i] ^ key[i] );
         ctx->opad[i] = (unsigned char)( ctx->opad[i] ^ key[i] );
     }

     md5_starts( ctx );
     md5_update( ctx, ctx->ipad, 64 );

     memset( sum, 0, sizeof( sum ) );
 }

 /*
  * MD5 HMAC process buffer
  */
 void md5_hmac_update( md5_context *ctx, unsigned char *input, int ilen )
 {
     md5_update( ctx, input, ilen );
 }

 /*
  * MD5 HMAC final digest
  */
 void md5_hmac_finish( md5_context *ctx, unsigned char output[16] )
 {
     unsigned char tmpbuf[16];

     md5_finish( ctx, tmpbuf );
     md5_starts( ctx );
     md5_update( ctx, ctx->opad, 64 );
     md5_update( ctx, tmpbuf, 16 );
     md5_finish( ctx, output );

     memset( tmpbuf, 0, sizeof( tmpbuf ) );
 }

 /*
  * output = HMAC-MD5( hmac key, input buffer )
  */
 void md5_hmac( unsigned char *key, int keylen, unsigned char *input, int ilen,
                unsigned char output[16] )
 {
     md5_context ctx;

     md5_hmac_starts( &ctx, key, keylen );
     md5_hmac_update( &ctx, input, ilen );
     md5_hmac_finish( &ctx, output );

     memset( &ctx, 0, sizeof( md5_context ) );
 }

 #if defined(POLARSSL_SELF_TEST)
 /*
  * RFC 1321 test vectors
  */
 static unsigned char md5_test_buf[7][81] =
 {
     { "" },
     { "a" },
     { "abc" },
     { "message digest" },
     { "abcdefghijklmnopqrstuvwxyz" },
     { "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789" },
     { "12345678901234567890123456789012345678901234567890123456789012" \
       "345678901234567890" }
 };

 static const int md5_test_buflen[7] =
 {
     0, 1, 3, 14, 26, 62, 80
 };

 static const unsigned char md5_test_sum[7][16] =
 {
     { 0xD4, 0x1D, 0x8C, 0xD9, 0x8F, 0x00, 0xB2, 0x04,
       0xE9, 0x80, 0x09, 0x98, 0xEC, 0xF8, 0x42, 0x7E },
     { 0x0C, 0xC1, 0x75, 0xB9, 0xC0, 0xF1, 0xB6, 0xA8,
       0x31, 0xC3, 0x99, 0xE2, 0x69, 0x77, 0x26, 0x61 },
     { 0x90, 0x01, 0x50, 0x98, 0x3C, 0xD2, 0x4F, 0xB0,
       0xD6, 0x96, 0x3F, 0x7D, 0x28, 0xE1, 0x7F, 0x72 },
     { 0xF9, 0x6B, 0x69, 0x7D, 0x7C, 0xB7, 0x93, 0x8D,
       0x52, 0x5A, 0x2F, 0x31, 0xAA, 0xF1, 0x61, 0xD0 },
     { 0xC3, 0xFC, 0xD3, 0xD7, 0x61, 0x92, 0xE4, 0x00,
       0x7D, 0xFB, 0x49, 0x6C, 0xCA, 0x67, 0xE1, 0x3B },
     { 0xD1, 0x74, 0xAB, 0x98, 0xD2, 0x77, 0xD9, 0xF5,
       0xA5, 0x61, 0x1C, 0x2C, 0x9F, 0x41, 0x9D, 0x9F },
     { 0x57, 0xED, 0xF4, 0xA2, 0x2B, 0xE3, 0xC9, 0x55,
       0xAC, 0x49, 0xDA, 0x2E, 0x21, 0x07, 0xB6, 0x7A }
 };

 /*
  * RFC 2202 test vectors
  */
 static unsigned char md5_hmac_test_key[7][26] =
 {
     { "\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B" },
     { "Jefe" },
     { "\xAA\xAA\xAA\xAA\xAA\xAA\xAA\xAA\xAA\xAA\xAA\xAA\xAA\xAA\xAA\xAA" },
     { "\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0A\x0B\x0C\x0D\x0E\x0F\x10"
       "\x11\x12\x13\x14\x15\x16\x17\x18\x19" },
     { "\x0C\x0C\x0C\x0C\x0C\x0C\x0C\x0C\x0C\x0C\x0C\x0C\x0C\x0C\x0C\x0C" },
     { "" }, /* 0xAA 80 times */
     { "" }
 };

 static const int md5_hmac_test_keylen[7] =
 {
     16, 4, 16, 25, 16, 80, 80
 };

 static unsigned char md5_hmac_test_buf[7][74] =
 {
     { "Hi There" },
     { "what do ya want for nothing?" },
     { "\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD"
       "\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD"
       "\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD"
       "\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD"
       "\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD" },
     { "\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD"
       "\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD"
       "\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD"
       "\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD"
       "\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD" },
     { "Test With Truncation" },
     { "Test Using Larger Than Block-Size Key - Hash Key First" },
     { "Test Using Larger Than Block-Size Key and Larger"
       " Than One Block-Size Data" }
 };

 static const int md5_hmac_test_buflen[7] =
 {
     8, 28, 50, 50, 20, 54, 73
 };

 static const unsigned char md5_hmac_test_sum[7][16] =
 {
     { 0x92, 0x94, 0x72, 0x7A, 0x36, 0x38, 0xBB, 0x1C,
       0x13, 0xF4, 0x8E, 0xF8, 0x15, 0x8B, 0xFC, 0x9D },
     { 0x75, 0x0C, 0x78, 0x3E, 0x6A, 0xB0, 0xB5, 0x03,
       0xEA, 0xA8, 0x6E, 0x31, 0x0A, 0x5D, 0xB7, 0x38 },
     { 0x56, 0xBE, 0x34, 0x52, 0x1D, 0x14, 0x4C, 0x88,
       0xDB, 0xB8, 0xC7, 0x33, 0xF0, 0xE8, 0xB3, 0xF6 },
     { 0x69, 0x7E, 0xAF, 0x0A, 0xCA, 0x3A, 0x3A, 0xEA,
       0x3A, 0x75, 0x16, 0x47, 0x46, 0xFF, 0xAA, 0x79 },
     { 0x56, 0x46, 0x1E, 0xF2, 0x34, 0x2E, 0xDC, 0x00,
       0xF9, 0xBA, 0xB9, 0x95 },
     { 0x6B, 0x1A, 0xB7, 0xFE, 0x4B, 0xD7, 0xBF, 0x8F,
       0x0B, 0x62, 0xE6, 0xCE, 0x61, 0xB9, 0xD0, 0xCD },
     { 0x6F, 0x63, 0x0F, 0xAD, 0x67, 0xCD, 0xA0, 0xEE,
       0x1F, 0xB1, 0xF5, 0x62, 0xDB, 0x3A, 0xA5, 0x3E }
 };

 /*
  * Checkup routine
  */
 int md5_self_test( int verbose )
 {
     int i, buflen;
     unsigned char buf[1024];
     unsigned char md5sum[16];
     md5_context ctx;

     for( i = 0; i < 7; i++ )
     {
         if( verbose != 0 )
             printf( "  MD5 test #%d: ", i + 1 );

         md5( md5_test_buf[i], md5_test_buflen[i], md5sum );

         if( memcmp( md5sum, md5_test_sum[i], 16 ) != 0 )
         {
             if( verbose != 0 )
                 printf( "failed\n" );

             return( 1 );
         }

         if( verbose != 0 )
             printf( "passed\n" );
     }

     if( verbose != 0 )
         printf( "\n" );

     for( i = 0; i < 7; i++ )
     {
         if( verbose != 0 )
             printf( "  HMAC-MD5 test #%d: ", i + 1 );

         if( i == 5 || i == 6 )
         {
             memset( buf, '\xAA', buflen = 80 );
             md5_hmac_starts( &ctx, buf, buflen );
         }
         else
             md5_hmac_starts( &ctx, md5_hmac_test_key[i],
                                    md5_hmac_test_keylen[i] );

         md5_hmac_update( &ctx, md5_hmac_test_buf[i],
                                md5_hmac_test_buflen[i] );

         md5_hmac_finish( &ctx, md5sum );

         buflen = ( i == 4 ) ? 12 : 16;

         if( memcmp( md5sum, md5_hmac_test_sum[i], buflen ) != 0 )
         {
             if( verbose != 0 )
                 printf( "failed\n" );

             return( 1 );
         }

         if( verbose != 0 )
             printf( "passed\n" );
     }

     if( verbose != 0 )
         printf( "\n" );

     return( 0 );
 }

 #endif

 #endif
	/*
	* RFC 1321 compliant MD5 implementation
	*
	* Based on XySSL: Copyright (C) 2006-2008 Christophe Devine
	*
	* Copyright (C) 2009 Paul Bakker <polarssl_maintainer at polarssl dot org>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License along
	* with this program; if not, write to the Free Software Foundation, Inc.,
	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
	*/
	/*
	* The MD5 algorithm was designed by Ron Rivest in 1991.
	*
	* http://www.ietf.org/rfc/rfc1321.txt
	*/

	#include "polarssl/config.h"

	#if defined(POLARSSL_MD5_C)

	#include "polarssl/md5.h"

	#include <string.h>
	#include <stdio.h>

	/*
	* 32-bit integer manipulation macros (little endian)
	*/
	#ifndef GET_ULONG_LE
	#define GET_ULONG_LE(n,b,i) \
	{ \
	(n) = ( (unsigned long) (b)[(i) ] ) \
	\| ( (unsigned long) (b)[(i) + 1] << 8 ) \
	\| ( (unsigned long) (b)[(i) + 2] << 16 ) \
	\| ( (unsigned long) (b)[(i) + 3] << 24 ); \
	}
	#endif

	#ifndef PUT_ULONG_LE
	#define PUT_ULONG_LE(n,b,i) \
	{ \
	(b)[(i) ] = (unsigned char) ( (n) ); \
	(b)[(i) + 1] = (unsigned char) ( (n) >> 8 ); \
	(b)[(i) + 2] = (unsigned char) ( (n) >> 16 ); \
	(b)[(i) + 3] = (unsigned char) ( (n) >> 24 ); \
	}
	#endif

	/*
	* MD5 context setup
	*/
	void md5_starts( md5_context *ctx )
	{
	ctx->total[0] = 0;
	ctx->total[1] = 0;

	ctx->state[0] = 0x67452301;
	ctx->state[1] = 0xEFCDAB89;
	ctx->state[2] = 0x98BADCFE;
	ctx->state[3] = 0x10325476;
	}

	static void md5_process( md5_context *ctx, unsigned char data[64] )
	{
	unsigned long X[16], A, B, C, D;

	GET_ULONG_LE( X[ 0], data, 0 );
	GET_ULONG_LE( X[ 1], data, 4 );
	GET_ULONG_LE( X[ 2], data, 8 );
	GET_ULONG_LE( X[ 3], data, 12 );
	GET_ULONG_LE( X[ 4], data, 16 );
	GET_ULONG_LE( X[ 5], data, 20 );
	GET_ULONG_LE( X[ 6], data, 24 );
	GET_ULONG_LE( X[ 7], data, 28 );
	GET_ULONG_LE( X[ 8], data, 32 );
	GET_ULONG_LE( X[ 9], data, 36 );
	GET_ULONG_LE( X[10], data, 40 );
	GET_ULONG_LE( X[11], data, 44 );
	GET_ULONG_LE( X[12], data, 48 );
	GET_ULONG_LE( X[13], data, 52 );
	GET_ULONG_LE( X[14], data, 56 );
	GET_ULONG_LE( X[15], data, 60 );

	#define S(x,n) ((x << n) \| ((x & 0xFFFFFFFF) >> (32 - n)))

	#define P(a,b,c,d,k,s,t) \
	{ \
	a += F(b,c,d) + X[k] + t; a = S(a,s) + b; \
	}

	A = ctx->state[0];
	B = ctx->state[1];
	C = ctx->state[2];
	D = ctx->state[3];

	#define F(x,y,z) (z ^ (x & (y ^ z)))

	P( A, B, C, D, 0, 7, 0xD76AA478 );
	P( D, A, B, C, 1, 12, 0xE8C7B756 );
	P( C, D, A, B, 2, 17, 0x242070DB );
	P( B, C, D, A, 3, 22, 0xC1BDCEEE );
	P( A, B, C, D, 4, 7, 0xF57C0FAF );
	P( D, A, B, C, 5, 12, 0x4787C62A );
	P( C, D, A, B, 6, 17, 0xA8304613 );
	P( B, C, D, A, 7, 22, 0xFD469501 );
	P( A, B, C, D, 8, 7, 0x698098D8 );
	P( D, A, B, C, 9, 12, 0x8B44F7AF );
	P( C, D, A, B, 10, 17, 0xFFFF5BB1 );
	P( B, C, D, A, 11, 22, 0x895CD7BE );
	P( A, B, C, D, 12, 7, 0x6B901122 );
	P( D, A, B, C, 13, 12, 0xFD987193 );
	P( C, D, A, B, 14, 17, 0xA679438E );
	P( B, C, D, A, 15, 22, 0x49B40821 );

	#undef F

	#define F(x,y,z) (y ^ (z & (x ^ y)))

	P( A, B, C, D, 1, 5, 0xF61E2562 );
	P( D, A, B, C, 6, 9, 0xC040B340 );
	P( C, D, A, B, 11, 14, 0x265E5A51 );
	P( B, C, D, A, 0, 20, 0xE9B6C7AA );
	P( A, B, C, D, 5, 5, 0xD62F105D );
	P( D, A, B, C, 10, 9, 0x02441453 );
	P( C, D, A, B, 15, 14, 0xD8A1E681 );
	P( B, C, D, A, 4, 20, 0xE7D3FBC8 );
	P( A, B, C, D, 9, 5, 0x21E1CDE6 );
	P( D, A, B, C, 14, 9, 0xC33707D6 );
	P( C, D, A, B, 3, 14, 0xF4D50D87 );
	P( B, C, D, A, 8, 20, 0x455A14ED );
	P( A, B, C, D, 13, 5, 0xA9E3E905 );
	P( D, A, B, C, 2, 9, 0xFCEFA3F8 );
	P( C, D, A, B, 7, 14, 0x676F02D9 );
	P( B, C, D, A, 12, 20, 0x8D2A4C8A );

	#undef F

	#define F(x,y,z) (x ^ y ^ z)

	P( A, B, C, D, 5, 4, 0xFFFA3942 );
	P( D, A, B, C, 8, 11, 0x8771F681 );
	P( C, D, A, B, 11, 16, 0x6D9D6122 );
	P( B, C, D, A, 14, 23, 0xFDE5380C );
	P( A, B, C, D, 1, 4, 0xA4BEEA44 );
	P( D, A, B, C, 4, 11, 0x4BDECFA9 );
	P( C, D, A, B, 7, 16, 0xF6BB4B60 );
	P( B, C, D, A, 10, 23, 0xBEBFBC70 );
	P( A, B, C, D, 13, 4, 0x289B7EC6 );
	P( D, A, B, C, 0, 11, 0xEAA127FA );
	P( C, D, A, B, 3, 16, 0xD4EF3085 );
	P( B, C, D, A, 6, 23, 0x04881D05 );
	P( A, B, C, D, 9, 4, 0xD9D4D039 );
	P( D, A, B, C, 12, 11, 0xE6DB99E5 );
	P( C, D, A, B, 15, 16, 0x1FA27CF8 );
	P( B, C, D, A, 2, 23, 0xC4AC5665 );

	#undef F

	#define F(x,y,z) (y ^ (x \| ~z))

	P( A, B, C, D, 0, 6, 0xF4292244 );
	P( D, A, B, C, 7, 10, 0x432AFF97 );
	P( C, D, A, B, 14, 15, 0xAB9423A7 );
	P( B, C, D, A, 5, 21, 0xFC93A039 );
	P( A, B, C, D, 12, 6, 0x655B59C3 );
	P( D, A, B, C, 3, 10, 0x8F0CCC92 );
	P( C, D, A, B, 10, 15, 0xFFEFF47D );
	P( B, C, D, A, 1, 21, 0x85845DD1 );
	P( A, B, C, D, 8, 6, 0x6FA87E4F );
	P( D, A, B, C, 15, 10, 0xFE2CE6E0 );
	P( C, D, A, B, 6, 15, 0xA3014314 );
	P( B, C, D, A, 13, 21, 0x4E0811A1 );
	P( A, B, C, D, 4, 6, 0xF7537E82 );
	P( D, A, B, C, 11, 10, 0xBD3AF235 );
	P( C, D, A, B, 2, 15, 0x2AD7D2BB );
	P( B, C, D, A, 9, 21, 0xEB86D391 );

	#undef F

	ctx->state[0] += A;
	ctx->state[1] += B;
	ctx->state[2] += C;
	ctx->state[3] += D;
	}

	/*
	* MD5 process buffer
	*/
	void md5_update( md5_context ctx, unsigned char input, int ilen )
	{
	int fill;
	unsigned long left;

	if( ilen <= 0 )
	return;

	left = ctx->total[0] & 0x3F;
	fill = 64 - left;

	ctx->total[0] += ilen;
	ctx->total[0] &= 0xFFFFFFFF;

	if( ctx->total[0] < (unsigned long) ilen )
	ctx->total[1]++;

	if( left && ilen >= fill )
	{
	memcpy( (void *) (ctx->buffer + left),
	(void *) input, fill );
	md5_process( ctx, ctx->buffer );
	input += fill;
	ilen -= fill;
	left = 0;
	}

	while( ilen >= 64 )
	{
	md5_process( ctx, input );
	input += 64;
	ilen -= 64;
	}

	if( ilen > 0 )
	{
	memcpy( (void *) (ctx->buffer + left),
	(void *) input, ilen );
	}
	}

	static const unsigned char md5_padding[64] =
	{
	0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
	};

	/*
	* MD5 final digest
	*/
	void md5_finish( md5_context *ctx, unsigned char output[16] )
	{
	unsigned long last, padn;
	unsigned long high, low;
	unsigned char msglen[8];

	high = ( ctx->total[0] >> 29 )
	\| ( ctx->total[1] << 3 );
	low = ( ctx->total[0] << 3 );

	PUT_ULONG_LE( low, msglen, 0 );
	PUT_ULONG_LE( high, msglen, 4 );

	last = ctx->total[0] & 0x3F;
	padn = ( last < 56 ) ? ( 56 - last ) : ( 120 - last );

	md5_update( ctx, (unsigned char *) md5_padding, padn );
	md5_update( ctx, msglen, 8 );

	PUT_ULONG_LE( ctx->state[0], output, 0 );
	PUT_ULONG_LE( ctx->state[1], output, 4 );
	PUT_ULONG_LE( ctx->state[2], output, 8 );
	PUT_ULONG_LE( ctx->state[3], output, 12 );
	}

	/*
	* output = MD5( input buffer )
	*/
	void md5( unsigned char *input, int ilen, unsigned char output[16] )
	{
	md5_context ctx;

	md5_starts( &ctx );
	md5_update( &ctx, input, ilen );
	md5_finish( &ctx, output );

	memset( &ctx, 0, sizeof( md5_context ) );
	}

	/*
	* output = MD5( file contents )
	*/
	int md5_file( char *path, unsigned char output[16] )
	{
	FILE *f;
	size_t n;
	md5_context ctx;
	unsigned char buf[1024];

	if( ( f = fopen( path, "rb" ) ) == NULL )
	return( 1 );

	md5_starts( &ctx );

	while( ( n = fread( buf, 1, sizeof( buf ), f ) ) > 0 )
	md5_update( &ctx, buf, (int) n );

	md5_finish( &ctx, output );

	memset( &ctx, 0, sizeof( md5_context ) );

	if( ferror( f ) != 0 )
	{
	fclose( f );
	return( 2 );
	}

	fclose( f );
	return( 0 );
	}

	/*
	* MD5 HMAC context setup
	*/
	void md5_hmac_starts( md5_context ctx, unsigned char key, int keylen )
	{
	int i;
	unsigned char sum[16];

	if( keylen > 64 )
	{
	md5( key, keylen, sum );
	keylen = 16;
	key = sum;
	}

	memset( ctx->ipad, 0x36, 64 );
	memset( ctx->opad, 0x5C, 64 );

	for( i = 0; i < keylen; i++ )
	{
	ctx->ipad[i] = (unsigned char)( ctx->ipad[i] ^ key[i] );
	ctx->opad[i] = (unsigned char)( ctx->opad[i] ^ key[i] );
	}

	md5_starts( ctx );
	md5_update( ctx, ctx->ipad, 64 );

	memset( sum, 0, sizeof( sum ) );
	}

	/*
	* MD5 HMAC process buffer
	*/
	void md5_hmac_update( md5_context ctx, unsigned char input, int ilen )
	{
	md5_update( ctx, input, ilen );
	}

	/*
	* MD5 HMAC final digest
	*/
	void md5_hmac_finish( md5_context *ctx, unsigned char output[16] )
	{
	unsigned char tmpbuf[16];

	md5_finish( ctx, tmpbuf );
	md5_starts( ctx );
	md5_update( ctx, ctx->opad, 64 );
	md5_update( ctx, tmpbuf, 16 );
	md5_finish( ctx, output );

	memset( tmpbuf, 0, sizeof( tmpbuf ) );
	}

	/*
	* output = HMAC-MD5( hmac key, input buffer )
	*/
	void md5_hmac( unsigned char key, int keylen, unsigned char input, int ilen,
	unsigned char output[16] )
	{
	md5_context ctx;

	md5_hmac_starts( &ctx, key, keylen );
	md5_hmac_update( &ctx, input, ilen );
	md5_hmac_finish( &ctx, output );

	memset( &ctx, 0, sizeof( md5_context ) );
	}

	#if defined(POLARSSL_SELF_TEST)
	/*
	* RFC 1321 test vectors
	*/
	static unsigned char md5_test_buf[7][81] =
	{
	{ "" },
	{ "a" },
	{ "abc" },
	{ "message digest" },
	{ "abcdefghijklmnopqrstuvwxyz" },
	{ "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789" },
	{ "12345678901234567890123456789012345678901234567890123456789012" \
	"345678901234567890" }
	};

	static const int md5_test_buflen[7] =
	{
	0, 1, 3, 14, 26, 62, 80
	};

	static const unsigned char md5_test_sum[7][16] =
	{
	{ 0xD4, 0x1D, 0x8C, 0xD9, 0x8F, 0x00, 0xB2, 0x04,
	0xE9, 0x80, 0x09, 0x98, 0xEC, 0xF8, 0x42, 0x7E },
	{ 0x0C, 0xC1, 0x75, 0xB9, 0xC0, 0xF1, 0xB6, 0xA8,
	0x31, 0xC3, 0x99, 0xE2, 0x69, 0x77, 0x26, 0x61 },
	{ 0x90, 0x01, 0x50, 0x98, 0x3C, 0xD2, 0x4F, 0xB0,
	0xD6, 0x96, 0x3F, 0x7D, 0x28, 0xE1, 0x7F, 0x72 },
	{ 0xF9, 0x6B, 0x69, 0x7D, 0x7C, 0xB7, 0x93, 0x8D,
	0x52, 0x5A, 0x2F, 0x31, 0xAA, 0xF1, 0x61, 0xD0 },
	{ 0xC3, 0xFC, 0xD3, 0xD7, 0x61, 0x92, 0xE4, 0x00,
	0x7D, 0xFB, 0x49, 0x6C, 0xCA, 0x67, 0xE1, 0x3B },
	{ 0xD1, 0x74, 0xAB, 0x98, 0xD2, 0x77, 0xD9, 0xF5,
	0xA5, 0x61, 0x1C, 0x2C, 0x9F, 0x41, 0x9D, 0x9F },
	{ 0x57, 0xED, 0xF4, 0xA2, 0x2B, 0xE3, 0xC9, 0x55,
	0xAC, 0x49, 0xDA, 0x2E, 0x21, 0x07, 0xB6, 0x7A }
	};

	/*
	* RFC 2202 test vectors
	*/
	static unsigned char md5_hmac_test_key[7][26] =
	{
	{ "\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B" },
	{ "Jefe" },
	{ "\xAA\xAA\xAA\xAA\xAA\xAA\xAA\xAA\xAA\xAA\xAA\xAA\xAA\xAA\xAA\xAA" },
	{ "\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0A\x0B\x0C\x0D\x0E\x0F\x10"
	"\x11\x12\x13\x14\x15\x16\x17\x18\x19" },
	{ "\x0C\x0C\x0C\x0C\x0C\x0C\x0C\x0C\x0C\x0C\x0C\x0C\x0C\x0C\x0C\x0C" },
	{ "" }, /* 0xAA 80 times */
	{ "" }
	};

	static const int md5_hmac_test_keylen[7] =
	{
	16, 4, 16, 25, 16, 80, 80
	};

	static unsigned char md5_hmac_test_buf[7][74] =
	{
	{ "Hi There" },
	{ "what do ya want for nothing?" },
	{ "\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD"
	"\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD"
	"\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD"
	"\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD"
	"\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD" },
	{ "\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD"
	"\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD"
	"\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD"
	"\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD"
	"\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD" },
	{ "Test With Truncation" },
	{ "Test Using Larger Than Block-Size Key - Hash Key First" },
	{ "Test Using Larger Than Block-Size Key and Larger"
	" Than One Block-Size Data" }
	};

	static const int md5_hmac_test_buflen[7] =
	{
	8, 28, 50, 50, 20, 54, 73
	};

	static const unsigned char md5_hmac_test_sum[7][16] =
	{
	{ 0x92, 0x94, 0x72, 0x7A, 0x36, 0x38, 0xBB, 0x1C,
	0x13, 0xF4, 0x8E, 0xF8, 0x15, 0x8B, 0xFC, 0x9D },
	{ 0x75, 0x0C, 0x78, 0x3E, 0x6A, 0xB0, 0xB5, 0x03,
	0xEA, 0xA8, 0x6E, 0x31, 0x0A, 0x5D, 0xB7, 0x38 },
	{ 0x56, 0xBE, 0x34, 0x52, 0x1D, 0x14, 0x4C, 0x88,
	0xDB, 0xB8, 0xC7, 0x33, 0xF0, 0xE8, 0xB3, 0xF6 },
	{ 0x69, 0x7E, 0xAF, 0x0A, 0xCA, 0x3A, 0x3A, 0xEA,
	0x3A, 0x75, 0x16, 0x47, 0x46, 0xFF, 0xAA, 0x79 },
	{ 0x56, 0x46, 0x1E, 0xF2, 0x34, 0x2E, 0xDC, 0x00,
	0xF9, 0xBA, 0xB9, 0x95 },
	{ 0x6B, 0x1A, 0xB7, 0xFE, 0x4B, 0xD7, 0xBF, 0x8F,
	0x0B, 0x62, 0xE6, 0xCE, 0x61, 0xB9, 0xD0, 0xCD },
	{ 0x6F, 0x63, 0x0F, 0xAD, 0x67, 0xCD, 0xA0, 0xEE,
	0x1F, 0xB1, 0xF5, 0x62, 0xDB, 0x3A, 0xA5, 0x3E }
	};

	/*
	* Checkup routine
	*/
	int md5_self_test( int verbose )
	{
	int i, buflen;
	unsigned char buf[1024];
	unsigned char md5sum[16];
	md5_context ctx;

	for( i = 0; i < 7; i++ )
	{
	if( verbose != 0 )
	printf( " MD5 test #%d: ", i + 1 );

	md5( md5_test_buf[i], md5_test_buflen[i], md5sum );

	if( memcmp( md5sum, md5_test_sum[i], 16 ) != 0 )
	{
	if( verbose != 0 )
	printf( "failed\n" );

	return( 1 );
	}

	if( verbose != 0 )
	printf( "passed\n" );
	}

	if( verbose != 0 )
	printf( "\n" );

	for( i = 0; i < 7; i++ )
	{
	if( verbose != 0 )
	printf( " HMAC-MD5 test #%d: ", i + 1 );

	if( i == 5 \|\| i == 6 )
	{
	memset( buf, '\xAA', buflen = 80 );
	md5_hmac_starts( &ctx, buf, buflen );
	}
	else
	md5_hmac_starts( &ctx, md5_hmac_test_key[i],
	md5_hmac_test_keylen[i] );

	md5_hmac_update( &ctx, md5_hmac_test_buf[i],
	md5_hmac_test_buflen[i] );

	md5_hmac_finish( &ctx, md5sum );

	buflen = ( i == 4 ) ? 12 : 16;

	if( memcmp( md5sum, md5_hmac_test_sum[i], buflen ) != 0 )
	{
	if( verbose != 0 )
	printf( "failed\n" );

	return( 1 );
	}

	if( verbose != 0 )
	printf( "passed\n" );
	}

	if( verbose != 0 )
	printf( "\n" );

	return( 0 );
	}

	#endif

	#endif