library/md4.c - security/mbedtls - Rivoreo Source Code Repositories

 /*
  *  RFC 1186/1320 compliant MD4 implementation
  *
  *  Copyright (C) 2006-2014, ARM Limited, All Rights Reserved
  *
  *  This file is part of mbed TLS (https://www.polarssl.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 MD4 algorithm was designed by Ron Rivest in 1990.
  *
  *  http://www.ietf.org/rfc/rfc1186.txt
  *  http://www.ietf.org/rfc/rfc1320.txt
  */

 #if !defined(POLARSSL_CONFIG_FILE)
 #include "polarssl/config.h"
 #else
 #include POLARSSL_CONFIG_FILE
 #endif

 #if defined(POLARSSL_MD4_C)

 #include "polarssl/md4.h"

 #if defined(POLARSSL_FS_IO) || defined(POLARSSL_SELF_TEST)
 #include <stdio.h>
 #endif

 #if defined(POLARSSL_PLATFORM_C)
 #include "polarssl/platform.h"
 #else
 #define polarssl_printf printf
 #endif

 /* Implementation that should never be optimized out by the compiler */
 static void polarssl_zeroize( void *v, size_t n ) {
     volatile unsigned char *p = v; while( n-- ) *p++ = 0;
 }

 #if !defined(POLARSSL_MD4_ALT)

 /*
  * 32-bit integer manipulation macros (little endian)
  */
 #ifndef GET_UINT32_LE
 #define GET_UINT32_LE(n,b,i)                            \
 {                                                       \
     (n) = ( (uint32_t) (b)[(i)    ]       )             \
         | ( (uint32_t) (b)[(i) + 1] <<  8 )             \
         | ( (uint32_t) (b)[(i) + 2] << 16 )             \
         | ( (uint32_t) (b)[(i) + 3] << 24 );            \
 }
 #endif

 #ifndef PUT_UINT32_LE
 #define PUT_UINT32_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

 void md4_init( md4_context *ctx )
 {
     memset( ctx, 0, sizeof( md4_context ) );
 }

 void md4_free( md4_context *ctx )
 {
     if( ctx == NULL )
         return;

     polarssl_zeroize( ctx, sizeof( md4_context ) );
 }

 /*
  * MD4 context setup
  */
 void md4_starts( md4_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;
 }

 void md4_process( md4_context *ctx, const unsigned char data[64] )
 {
     uint32_t X[16], A, B, C, D;

     GET_UINT32_LE( X[ 0], data,  0 );
     GET_UINT32_LE( X[ 1], data,  4 );
     GET_UINT32_LE( X[ 2], data,  8 );
     GET_UINT32_LE( X[ 3], data, 12 );
     GET_UINT32_LE( X[ 4], data, 16 );
     GET_UINT32_LE( X[ 5], data, 20 );
     GET_UINT32_LE( X[ 6], data, 24 );
     GET_UINT32_LE( X[ 7], data, 28 );
     GET_UINT32_LE( X[ 8], data, 32 );
     GET_UINT32_LE( X[ 9], data, 36 );
     GET_UINT32_LE( X[10], data, 40 );
     GET_UINT32_LE( X[11], data, 44 );
     GET_UINT32_LE( X[12], data, 48 );
     GET_UINT32_LE( X[13], data, 52 );
     GET_UINT32_LE( X[14], data, 56 );
     GET_UINT32_LE( X[15], data, 60 );

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

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

 #define F(x, y, z) ((x & y) | ((~x) & z))
 #define P(a,b,c,d,x,s) { a += F(b,c,d) + x; a = S(a,s); }

     P( A, B, C, D, X[ 0],  3 );
     P( D, A, B, C, X[ 1],  7 );
     P( C, D, A, B, X[ 2], 11 );
     P( B, C, D, A, X[ 3], 19 );
     P( A, B, C, D, X[ 4],  3 );
     P( D, A, B, C, X[ 5],  7 );
     P( C, D, A, B, X[ 6], 11 );
     P( B, C, D, A, X[ 7], 19 );
     P( A, B, C, D, X[ 8],  3 );
     P( D, A, B, C, X[ 9],  7 );
     P( C, D, A, B, X[10], 11 );
     P( B, C, D, A, X[11], 19 );
     P( A, B, C, D, X[12],  3 );
     P( D, A, B, C, X[13],  7 );
     P( C, D, A, B, X[14], 11 );
     P( B, C, D, A, X[15], 19 );

 #undef P
 #undef F

 #define F(x,y,z) ((x & y) | (x & z) | (y & z))
 #define P(a,b,c,d,x,s) { a += F(b,c,d) + x + 0x5A827999; a = S(a,s); }

     P( A, B, C, D, X[ 0],  3 );
     P( D, A, B, C, X[ 4],  5 );
     P( C, D, A, B, X[ 8],  9 );
     P( B, C, D, A, X[12], 13 );
     P( A, B, C, D, X[ 1],  3 );
     P( D, A, B, C, X[ 5],  5 );
     P( C, D, A, B, X[ 9],  9 );
     P( B, C, D, A, X[13], 13 );
     P( A, B, C, D, X[ 2],  3 );
     P( D, A, B, C, X[ 6],  5 );
     P( C, D, A, B, X[10],  9 );
     P( B, C, D, A, X[14], 13 );
     P( A, B, C, D, X[ 3],  3 );
     P( D, A, B, C, X[ 7],  5 );
     P( C, D, A, B, X[11],  9 );
     P( B, C, D, A, X[15], 13 );

 #undef P
 #undef F

 #define F(x,y,z) (x ^ y ^ z)
 #define P(a,b,c,d,x,s) { a += F(b,c,d) + x + 0x6ED9EBA1; a = S(a,s); }

     P( A, B, C, D, X[ 0],  3 );
     P( D, A, B, C, X[ 8],  9 );
     P( C, D, A, B, X[ 4], 11 );
     P( B, C, D, A, X[12], 15 );
     P( A, B, C, D, X[ 2],  3 );
     P( D, A, B, C, X[10],  9 );
     P( C, D, A, B, X[ 6], 11 );
     P( B, C, D, A, X[14], 15 );
     P( A, B, C, D, X[ 1],  3 );
     P( D, A, B, C, X[ 9],  9 );
     P( C, D, A, B, X[ 5], 11 );
     P( B, C, D, A, X[13], 15 );
     P( A, B, C, D, X[ 3],  3 );
     P( D, A, B, C, X[11],  9 );
     P( C, D, A, B, X[ 7], 11 );
     P( B, C, D, A, X[15], 15 );

 #undef F
 #undef P

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

 /*
  * MD4 process buffer
  */
 void md4_update( md4_context *ctx, const unsigned char *input, size_t ilen )
 {
     size_t fill;
     uint32_t left;

     if( ilen == 0 )
         return;

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

     ctx->total[0] += (uint32_t) ilen;
     ctx->total[0] &= 0xFFFFFFFF;

     if( ctx->total[0] < (uint32_t) ilen )
         ctx->total[1]++;

     if( left && ilen >= fill )
     {
         memcpy( (void *) (ctx->buffer + left),
                 (void *) input, fill );
         md4_process( ctx, ctx->buffer );
         input += fill;
         ilen  -= fill;
         left = 0;
     }

     while( ilen >= 64 )
     {
         md4_process( ctx, input );
         input += 64;
         ilen  -= 64;
     }

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

 static const unsigned char md4_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
 };

 /*
  * MD4 final digest
  */
 void md4_finish( md4_context *ctx, unsigned char output[16] )
 {
     uint32_t last, padn;
     uint32_t high, low;
     unsigned char msglen[8];

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

     PUT_UINT32_LE( low,  msglen, 0 );
     PUT_UINT32_LE( high, msglen, 4 );

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

     md4_update( ctx, (unsigned char *) md4_padding, padn );
     md4_update( ctx, msglen, 8 );

     PUT_UINT32_LE( ctx->state[0], output,  0 );
     PUT_UINT32_LE( ctx->state[1], output,  4 );
     PUT_UINT32_LE( ctx->state[2], output,  8 );
     PUT_UINT32_LE( ctx->state[3], output, 12 );
 }

 #endif /* !POLARSSL_MD4_ALT */

 /*
  * output = MD4( input buffer )
  */
 void md4( const unsigned char *input, size_t ilen, unsigned char output[16] )
 {
     md4_context ctx;

     md4_init( &ctx );
     md4_starts( &ctx );
     md4_update( &ctx, input, ilen );
     md4_finish( &ctx, output );
     md4_free( &ctx );
 }

 #if defined(POLARSSL_FS_IO)
 /*
  * output = MD4( file contents )
  */
 int md4_file( const char *path, unsigned char output[16] )
 {
     FILE *f;
     size_t n;
     md4_context ctx;
     unsigned char buf[1024];

     if( ( f = fopen( path, "rb" ) ) == NULL )
         return( POLARSSL_ERR_MD4_FILE_IO_ERROR );

     md4_init( &ctx );
     md4_starts( &ctx );

     while( ( n = fread( buf, 1, sizeof( buf ), f ) ) > 0 )
         md4_update( &ctx, buf, n );

     md4_finish( &ctx, output );
     md4_free( &ctx );

     if( ferror( f ) != 0 )
     {
         fclose( f );
         return( POLARSSL_ERR_MD4_FILE_IO_ERROR );
     }

     fclose( f );
     return( 0 );
 }
 #endif /* POLARSSL_FS_IO */

 /*
  * MD4 HMAC context setup
  */
 void md4_hmac_starts( md4_context *ctx, const unsigned char *key,
                       size_t keylen )
 {
     size_t i;
     unsigned char sum[16];

     if( keylen > 64 )
     {
         md4( 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] );
     }

     md4_starts( ctx );
     md4_update( ctx, ctx->ipad, 64 );

     polarssl_zeroize( sum, sizeof( sum ) );
 }

 /*
  * MD4 HMAC process buffer
  */
 void md4_hmac_update( md4_context *ctx, const unsigned char *input,
                       size_t ilen )
 {
     md4_update( ctx, input, ilen );
 }

 /*
  * MD4 HMAC final digest
  */
 void md4_hmac_finish( md4_context *ctx, unsigned char output[16] )
 {
     unsigned char tmpbuf[16];

     md4_finish( ctx, tmpbuf );
     md4_starts( ctx );
     md4_update( ctx, ctx->opad, 64 );
     md4_update( ctx, tmpbuf, 16 );
     md4_finish( ctx, output );

     polarssl_zeroize( tmpbuf, sizeof( tmpbuf ) );
 }

 /*
  * MD4 HMAC context reset
  */
 void md4_hmac_reset( md4_context *ctx )
 {
     md4_starts( ctx );
     md4_update( ctx, ctx->ipad, 64 );
 }

 /*
  * output = HMAC-MD4( hmac key, input buffer )
  */
 void md4_hmac( const unsigned char *key, size_t keylen,
                const unsigned char *input, size_t ilen,
                unsigned char output[16] )
 {
     md4_context ctx;

     md4_init( &ctx );
     md4_hmac_starts( &ctx, key, keylen );
     md4_hmac_update( &ctx, input, ilen );
     md4_hmac_finish( &ctx, output );
     md4_free( &ctx );
 }

 #if defined(POLARSSL_SELF_TEST)

 /*
  * RFC 1320 test vectors
  */
 static const char md4_test_str[7][81] =
 {
     { "" },
     { "a" },
     { "abc" },
     { "message digest" },
     { "abcdefghijklmnopqrstuvwxyz" },
     { "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789" },
     { "12345678901234567890123456789012345678901234567890123456789012" \
       "345678901234567890" }
 };

 static const unsigned char md4_test_sum[7][16] =
 {
     { 0x31, 0xD6, 0xCF, 0xE0, 0xD1, 0x6A, 0xE9, 0x31,
       0xB7, 0x3C, 0x59, 0xD7, 0xE0, 0xC0, 0x89, 0xC0 },
     { 0xBD, 0xE5, 0x2C, 0xB3, 0x1D, 0xE3, 0x3E, 0x46,
       0x24, 0x5E, 0x05, 0xFB, 0xDB, 0xD6, 0xFB, 0x24 },
     { 0xA4, 0x48, 0x01, 0x7A, 0xAF, 0x21, 0xD8, 0x52,
       0x5F, 0xC1, 0x0A, 0xE8, 0x7A, 0xA6, 0x72, 0x9D },
     { 0xD9, 0x13, 0x0A, 0x81, 0x64, 0x54, 0x9F, 0xE8,
       0x18, 0x87, 0x48, 0x06, 0xE1, 0xC7, 0x01, 0x4B },
     { 0xD7, 0x9E, 0x1C, 0x30, 0x8A, 0xA5, 0xBB, 0xCD,
       0xEE, 0xA8, 0xED, 0x63, 0xDF, 0x41, 0x2D, 0xA9 },
     { 0x04, 0x3F, 0x85, 0x82, 0xF2, 0x41, 0xDB, 0x35,
       0x1C, 0xE6, 0x27, 0xE1, 0x53, 0xE7, 0xF0, 0xE4 },
     { 0xE3, 0x3B, 0x4D, 0xDC, 0x9C, 0x38, 0xF2, 0x19,
       0x9C, 0x3E, 0x7B, 0x16, 0x4F, 0xCC, 0x05, 0x36 }
 };

 /*
  * Checkup routine
  */
 int md4_self_test( int verbose )
 {
     int i;
     unsigned char md4sum[16];

     for( i = 0; i < 7; i++ )
     {
         if( verbose != 0 )
             polarssl_printf( "  MD4 test #%d: ", i + 1 );

         md4( (unsigned char *) md4_test_str[i],
              strlen( md4_test_str[i] ), md4sum );

         if( memcmp( md4sum, md4_test_sum[i], 16 ) != 0 )
         {
             if( verbose != 0 )
                 polarssl_printf( "failed\n" );

             return( 1 );
         }

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

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

     return( 0 );
 }

 #endif /* POLARSSL_SELF_TEST */

 #endif /* POLARSSL_MD4_C */
	/*
	* RFC 1186/1320 compliant MD4 implementation
	*
	* Copyright (C) 2006-2014, ARM Limited, All Rights Reserved
	*
	* This file is part of mbed TLS (https://www.polarssl.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 MD4 algorithm was designed by Ron Rivest in 1990.
	*
	* http://www.ietf.org/rfc/rfc1186.txt
	* http://www.ietf.org/rfc/rfc1320.txt
	*/

	#if !defined(POLARSSL_CONFIG_FILE)
	#include "polarssl/config.h"
	#else
	#include POLARSSL_CONFIG_FILE
	#endif

	#if defined(POLARSSL_MD4_C)

	#include "polarssl/md4.h"

	#if defined(POLARSSL_FS_IO) \|\| defined(POLARSSL_SELF_TEST)
	#include <stdio.h>
	#endif

	#if defined(POLARSSL_PLATFORM_C)
	#include "polarssl/platform.h"
	#else
	#define polarssl_printf printf
	#endif

	/* Implementation that should never be optimized out by the compiler */
	static void polarssl_zeroize( void *v, size_t n ) {
	volatile unsigned char p = v; while( n-- ) p++ = 0;
	}

	#if !defined(POLARSSL_MD4_ALT)

	/*
	* 32-bit integer manipulation macros (little endian)
	*/
	#ifndef GET_UINT32_LE
	#define GET_UINT32_LE(n,b,i) \
	{ \
	(n) = ( (uint32_t) (b)[(i) ] ) \
	\| ( (uint32_t) (b)[(i) + 1] << 8 ) \
	\| ( (uint32_t) (b)[(i) + 2] << 16 ) \
	\| ( (uint32_t) (b)[(i) + 3] << 24 ); \
	}
	#endif

	#ifndef PUT_UINT32_LE
	#define PUT_UINT32_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

	void md4_init( md4_context *ctx )
	{
	memset( ctx, 0, sizeof( md4_context ) );
	}

	void md4_free( md4_context *ctx )
	{
	if( ctx == NULL )
	return;

	polarssl_zeroize( ctx, sizeof( md4_context ) );
	}

	/*
	* MD4 context setup
	*/
	void md4_starts( md4_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;
	}

	void md4_process( md4_context *ctx, const unsigned char data[64] )
	{
	uint32_t X[16], A, B, C, D;

	GET_UINT32_LE( X[ 0], data, 0 );
	GET_UINT32_LE( X[ 1], data, 4 );
	GET_UINT32_LE( X[ 2], data, 8 );
	GET_UINT32_LE( X[ 3], data, 12 );
	GET_UINT32_LE( X[ 4], data, 16 );
	GET_UINT32_LE( X[ 5], data, 20 );
	GET_UINT32_LE( X[ 6], data, 24 );
	GET_UINT32_LE( X[ 7], data, 28 );
	GET_UINT32_LE( X[ 8], data, 32 );
	GET_UINT32_LE( X[ 9], data, 36 );
	GET_UINT32_LE( X[10], data, 40 );
	GET_UINT32_LE( X[11], data, 44 );
	GET_UINT32_LE( X[12], data, 48 );
	GET_UINT32_LE( X[13], data, 52 );
	GET_UINT32_LE( X[14], data, 56 );
	GET_UINT32_LE( X[15], data, 60 );

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

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

	#define F(x, y, z) ((x & y) \| ((~x) & z))
	#define P(a,b,c,d,x,s) { a += F(b,c,d) + x; a = S(a,s); }

	P( A, B, C, D, X[ 0], 3 );
	P( D, A, B, C, X[ 1], 7 );
	P( C, D, A, B, X[ 2], 11 );
	P( B, C, D, A, X[ 3], 19 );
	P( A, B, C, D, X[ 4], 3 );
	P( D, A, B, C, X[ 5], 7 );
	P( C, D, A, B, X[ 6], 11 );
	P( B, C, D, A, X[ 7], 19 );
	P( A, B, C, D, X[ 8], 3 );
	P( D, A, B, C, X[ 9], 7 );
	P( C, D, A, B, X[10], 11 );
	P( B, C, D, A, X[11], 19 );
	P( A, B, C, D, X[12], 3 );
	P( D, A, B, C, X[13], 7 );
	P( C, D, A, B, X[14], 11 );
	P( B, C, D, A, X[15], 19 );

	#undef P
	#undef F

	#define F(x,y,z) ((x & y) \| (x & z) \| (y & z))
	#define P(a,b,c,d,x,s) { a += F(b,c,d) + x + 0x5A827999; a = S(a,s); }

	P( A, B, C, D, X[ 0], 3 );
	P( D, A, B, C, X[ 4], 5 );
	P( C, D, A, B, X[ 8], 9 );
	P( B, C, D, A, X[12], 13 );
	P( A, B, C, D, X[ 1], 3 );
	P( D, A, B, C, X[ 5], 5 );
	P( C, D, A, B, X[ 9], 9 );
	P( B, C, D, A, X[13], 13 );
	P( A, B, C, D, X[ 2], 3 );
	P( D, A, B, C, X[ 6], 5 );
	P( C, D, A, B, X[10], 9 );
	P( B, C, D, A, X[14], 13 );
	P( A, B, C, D, X[ 3], 3 );
	P( D, A, B, C, X[ 7], 5 );
	P( C, D, A, B, X[11], 9 );
	P( B, C, D, A, X[15], 13 );

	#undef P
	#undef F

	#define F(x,y,z) (x ^ y ^ z)
	#define P(a,b,c,d,x,s) { a += F(b,c,d) + x + 0x6ED9EBA1; a = S(a,s); }

	P( A, B, C, D, X[ 0], 3 );
	P( D, A, B, C, X[ 8], 9 );
	P( C, D, A, B, X[ 4], 11 );
	P( B, C, D, A, X[12], 15 );
	P( A, B, C, D, X[ 2], 3 );
	P( D, A, B, C, X[10], 9 );
	P( C, D, A, B, X[ 6], 11 );
	P( B, C, D, A, X[14], 15 );
	P( A, B, C, D, X[ 1], 3 );
	P( D, A, B, C, X[ 9], 9 );
	P( C, D, A, B, X[ 5], 11 );
	P( B, C, D, A, X[13], 15 );
	P( A, B, C, D, X[ 3], 3 );
	P( D, A, B, C, X[11], 9 );
	P( C, D, A, B, X[ 7], 11 );
	P( B, C, D, A, X[15], 15 );

	#undef F
	#undef P

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

	/*
	* MD4 process buffer
	*/
	void md4_update( md4_context ctx, const unsigned char input, size_t ilen )
	{
	size_t fill;
	uint32_t left;

	if( ilen == 0 )
	return;

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

	ctx->total[0] += (uint32_t) ilen;
	ctx->total[0] &= 0xFFFFFFFF;

	if( ctx->total[0] < (uint32_t) ilen )
	ctx->total[1]++;

	if( left && ilen >= fill )
	{
	memcpy( (void *) (ctx->buffer + left),
	(void *) input, fill );
	md4_process( ctx, ctx->buffer );
	input += fill;
	ilen -= fill;
	left = 0;
	}

	while( ilen >= 64 )
	{
	md4_process( ctx, input );
	input += 64;
	ilen -= 64;
	}

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

	static const unsigned char md4_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
	};

	/*
	* MD4 final digest
	*/
	void md4_finish( md4_context *ctx, unsigned char output[16] )
	{
	uint32_t last, padn;
	uint32_t high, low;
	unsigned char msglen[8];

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

	PUT_UINT32_LE( low, msglen, 0 );
	PUT_UINT32_LE( high, msglen, 4 );

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

	md4_update( ctx, (unsigned char *) md4_padding, padn );
	md4_update( ctx, msglen, 8 );

	PUT_UINT32_LE( ctx->state[0], output, 0 );
	PUT_UINT32_LE( ctx->state[1], output, 4 );
	PUT_UINT32_LE( ctx->state[2], output, 8 );
	PUT_UINT32_LE( ctx->state[3], output, 12 );
	}

	#endif /* !POLARSSL_MD4_ALT */

	/*
	* output = MD4( input buffer )
	*/
	void md4( const unsigned char *input, size_t ilen, unsigned char output[16] )
	{
	md4_context ctx;

	md4_init( &ctx );
	md4_starts( &ctx );
	md4_update( &ctx, input, ilen );
	md4_finish( &ctx, output );
	md4_free( &ctx );
	}

	#if defined(POLARSSL_FS_IO)
	/*
	* output = MD4( file contents )
	*/
	int md4_file( const char *path, unsigned char output[16] )
	{
	FILE *f;
	size_t n;
	md4_context ctx;
	unsigned char buf[1024];

	if( ( f = fopen( path, "rb" ) ) == NULL )
	return( POLARSSL_ERR_MD4_FILE_IO_ERROR );

	md4_init( &ctx );
	md4_starts( &ctx );

	while( ( n = fread( buf, 1, sizeof( buf ), f ) ) > 0 )
	md4_update( &ctx, buf, n );

	md4_finish( &ctx, output );
	md4_free( &ctx );

	if( ferror( f ) != 0 )
	{
	fclose( f );
	return( POLARSSL_ERR_MD4_FILE_IO_ERROR );
	}

	fclose( f );
	return( 0 );
	}
	#endif /* POLARSSL_FS_IO */

	/*
	* MD4 HMAC context setup
	*/
	void md4_hmac_starts( md4_context ctx, const unsigned char key,
	size_t keylen )
	{
	size_t i;
	unsigned char sum[16];

	if( keylen > 64 )
	{
	md4( 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] );
	}

	md4_starts( ctx );
	md4_update( ctx, ctx->ipad, 64 );

	polarssl_zeroize( sum, sizeof( sum ) );
	}

	/*
	* MD4 HMAC process buffer
	*/
	void md4_hmac_update( md4_context ctx, const unsigned char input,
	size_t ilen )
	{
	md4_update( ctx, input, ilen );
	}

	/*
	* MD4 HMAC final digest
	*/
	void md4_hmac_finish( md4_context *ctx, unsigned char output[16] )
	{
	unsigned char tmpbuf[16];

	md4_finish( ctx, tmpbuf );
	md4_starts( ctx );
	md4_update( ctx, ctx->opad, 64 );
	md4_update( ctx, tmpbuf, 16 );
	md4_finish( ctx, output );

	polarssl_zeroize( tmpbuf, sizeof( tmpbuf ) );
	}

	/*
	* MD4 HMAC context reset
	*/
	void md4_hmac_reset( md4_context *ctx )
	{
	md4_starts( ctx );
	md4_update( ctx, ctx->ipad, 64 );
	}

	/*
	* output = HMAC-MD4( hmac key, input buffer )
	*/
	void md4_hmac( const unsigned char *key, size_t keylen,
	const unsigned char *input, size_t ilen,
	unsigned char output[16] )
	{
	md4_context ctx;

	md4_init( &ctx );
	md4_hmac_starts( &ctx, key, keylen );
	md4_hmac_update( &ctx, input, ilen );
	md4_hmac_finish( &ctx, output );
	md4_free( &ctx );
	}

	#if defined(POLARSSL_SELF_TEST)

	/*
	* RFC 1320 test vectors
	*/
	static const char md4_test_str[7][81] =
	{
	{ "" },
	{ "a" },
	{ "abc" },
	{ "message digest" },
	{ "abcdefghijklmnopqrstuvwxyz" },
	{ "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789" },
	{ "12345678901234567890123456789012345678901234567890123456789012" \
	"345678901234567890" }
	};

	static const unsigned char md4_test_sum[7][16] =
	{
	{ 0x31, 0xD6, 0xCF, 0xE0, 0xD1, 0x6A, 0xE9, 0x31,
	0xB7, 0x3C, 0x59, 0xD7, 0xE0, 0xC0, 0x89, 0xC0 },
	{ 0xBD, 0xE5, 0x2C, 0xB3, 0x1D, 0xE3, 0x3E, 0x46,
	0x24, 0x5E, 0x05, 0xFB, 0xDB, 0xD6, 0xFB, 0x24 },
	{ 0xA4, 0x48, 0x01, 0x7A, 0xAF, 0x21, 0xD8, 0x52,
	0x5F, 0xC1, 0x0A, 0xE8, 0x7A, 0xA6, 0x72, 0x9D },
	{ 0xD9, 0x13, 0x0A, 0x81, 0x64, 0x54, 0x9F, 0xE8,
	0x18, 0x87, 0x48, 0x06, 0xE1, 0xC7, 0x01, 0x4B },
	{ 0xD7, 0x9E, 0x1C, 0x30, 0x8A, 0xA5, 0xBB, 0xCD,
	0xEE, 0xA8, 0xED, 0x63, 0xDF, 0x41, 0x2D, 0xA9 },
	{ 0x04, 0x3F, 0x85, 0x82, 0xF2, 0x41, 0xDB, 0x35,
	0x1C, 0xE6, 0x27, 0xE1, 0x53, 0xE7, 0xF0, 0xE4 },
	{ 0xE3, 0x3B, 0x4D, 0xDC, 0x9C, 0x38, 0xF2, 0x19,
	0x9C, 0x3E, 0x7B, 0x16, 0x4F, 0xCC, 0x05, 0x36 }
	};

	/*
	* Checkup routine
	*/
	int md4_self_test( int verbose )
	{
	int i;
	unsigned char md4sum[16];

	for( i = 0; i < 7; i++ )
	{
	if( verbose != 0 )
	polarssl_printf( " MD4 test #%d: ", i + 1 );

	md4( (unsigned char *) md4_test_str[i],
	strlen( md4_test_str[i] ), md4sum );

	if( memcmp( md4sum, md4_test_sum[i], 16 ) != 0 )
	{
	if( verbose != 0 )
	polarssl_printf( "failed\n" );

	return( 1 );
	}

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

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

	return( 0 );
	}

	#endif /* POLARSSL_SELF_TEST */

	#endif /* POLARSSL_MD4_C */