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

 /*
  *  RFC 1186/1320 compliant MD4 implementation
  *
  *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
  *  SPDX-License-Identifier: Apache-2.0
  *
  *  Licensed under the Apache License, Version 2.0 (the "License"); you may
  *  not use this file except in compliance with the License.
  *  You may obtain a copy of the License at
  *
  *  http://www.apache.org/licenses/LICENSE-2.0
  *
  *  Unless required by applicable law or agreed to in writing, software
  *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  *  See the License for the specific language governing permissions and
  *  limitations under the License.
  *
  *  This file is part of mbed TLS (https://tls.mbed.org)
  */
 /*
  *  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(MBEDTLS_CONFIG_FILE)
 #include "mbedtls/config.h"
 #else
 #include MBEDTLS_CONFIG_FILE
 #endif

 #if defined(MBEDTLS_MD4_C)

 #include "mbedtls/md4.h"

 #include <string.h>

 #if defined(MBEDTLS_SELF_TEST)
 #if defined(MBEDTLS_PLATFORM_C)
 #include "mbedtls/platform.h"
 #else
 #include <stdio.h>
 #define mbedtls_printf printf
 #endif /* MBEDTLS_PLATFORM_C */
 #endif /* MBEDTLS_SELF_TEST */

 #if !defined(MBEDTLS_MD4_ALT)

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

 /*
  * 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)       ) & 0xFF );    \
     (b)[(i) + 1] = (unsigned char) ( ( (n) >>  8 ) & 0xFF );    \
     (b)[(i) + 2] = (unsigned char) ( ( (n) >> 16 ) & 0xFF );    \
     (b)[(i) + 3] = (unsigned char) ( ( (n) >> 24 ) & 0xFF );    \
 }
 #endif

 void mbedtls_md4_init( mbedtls_md4_context *ctx )
 {
     memset( ctx, 0, sizeof( mbedtls_md4_context ) );
 }

 void mbedtls_md4_free( mbedtls_md4_context *ctx )
 {
     if( ctx == NULL )
         return;

     mbedtls_zeroize( ctx, sizeof( mbedtls_md4_context ) );
 }

 void mbedtls_md4_clone( mbedtls_md4_context *dst,
                         const mbedtls_md4_context *src )
 {
     *dst = *src;
 }

 /*
  * MD4 context setup
  */
 int mbedtls_md4_starts_ret( mbedtls_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;

     return( 0 );
 }

 #if !defined(MBEDTLS_DEPRECATED_REMOVED)
 void mbedtls_md4_starts( mbedtls_md4_context *ctx )
 {
     mbedtls_md4_starts_ret( ctx );
 }
 #endif

 #if !defined(MBEDTLS_MD4_PROCESS_ALT)
 int mbedtls_internal_md4_process( mbedtls_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;

     return( 0 );
 }

 #if !defined(MBEDTLS_DEPRECATED_REMOVED)
 void mbedtls_md4_process( mbedtls_md4_context *ctx,
                           const unsigned char data[64] )
 {
     mbedtls_internal_md4_process( ctx, data );
 }
 #endif
 #endif /* !MBEDTLS_MD4_PROCESS_ALT */

 /*
  * MD4 process buffer
  */
 int mbedtls_md4_update_ret( mbedtls_md4_context *ctx,
                             const unsigned char *input,
                             size_t ilen )
 {
     int ret;
     size_t fill;
     uint32_t left;

     if( ilen == 0 )
         return( 0 );

     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 );

         if( ( ret = mbedtls_internal_md4_process( ctx, ctx->buffer ) ) != 0 )
             return( ret );

         input += fill;
         ilen  -= fill;
         left = 0;
     }

     while( ilen >= 64 )
     {
         if( ( ret = mbedtls_internal_md4_process( ctx, input ) ) != 0 )
             return( ret );

         input += 64;
         ilen  -= 64;
     }

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

     return( 0 );
 }

 #if !defined(MBEDTLS_DEPRECATED_REMOVED)
 void mbedtls_md4_update( mbedtls_md4_context *ctx,
                          const unsigned char *input,
                          size_t ilen )
 {
     mbedtls_md4_update_ret( ctx, input, ilen );
 }
 #endif

 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
  */
 int mbedtls_md4_finish_ret( mbedtls_md4_context *ctx,
                             unsigned char output[16] )
 {
     int ret;
     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 );

     ret = mbedtls_md4_update_ret( ctx, (unsigned char *)md4_padding, padn );
     if( ret != 0 )
         return( ret );

     if( ( ret = mbedtls_md4_update_ret( ctx, msglen, 8 ) ) != 0 )
         return( ret );


     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 );

     return( 0 );
 }

 #if !defined(MBEDTLS_DEPRECATED_REMOVED)
 void mbedtls_md4_finish( mbedtls_md4_context *ctx,
                          unsigned char output[16] )
 {
     mbedtls_md4_finish_ret( ctx, output );
 }
 #endif

 #endif /* !MBEDTLS_MD4_ALT */

 /*
  * output = MD4( input buffer )
  */
 int mbedtls_md4_ret( const unsigned char *input,
                      size_t ilen,
                      unsigned char output[16] )
 {
     int ret;
     mbedtls_md4_context ctx;

     mbedtls_md4_init( &ctx );

     if( ( ret = mbedtls_md4_starts_ret( &ctx ) ) != 0 )
         goto exit;

     if( ( ret = mbedtls_md4_update_ret( &ctx, input, ilen ) ) != 0 )
         goto exit;

     if( ( ret = mbedtls_md4_finish_ret( &ctx, output ) ) != 0 )
         goto exit;

 exit:
     mbedtls_md4_free( &ctx );

     return( ret );
 }

 #if !defined(MBEDTLS_DEPRECATED_REMOVED)
 void mbedtls_md4( const unsigned char *input,
                   size_t ilen,
                   unsigned char output[16] )
 {
     mbedtls_md4_ret( input, ilen, output );
 }
 #endif

 #if defined(MBEDTLS_SELF_TEST)

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

 static const size_t md4_test_strlen[7] =
 {
     0, 1, 3, 14, 26, 62, 80
 };

 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 mbedtls_md4_self_test( int verbose )
 {
     int i, ret = 0;
     unsigned char md4sum[16];

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

         ret = mbedtls_md4_ret( md4_test_str[i], md4_test_strlen[i], md4sum );
         if( ret != 0 )
             goto fail;

         if( memcmp( md4sum, md4_test_sum[i], 16 ) != 0 )
         {
             ret = 1;
             goto fail;
         }

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

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

     return( 0 );

 fail:
     if( verbose != 0 )
         mbedtls_printf( "failed\n" );

     return( ret );
 }

 #endif /* MBEDTLS_SELF_TEST */

 #endif /* MBEDTLS_MD4_C */
	/*
	* RFC 1186/1320 compliant MD4 implementation
	*
	* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
	* SPDX-License-Identifier: Apache-2.0
	*
	* Licensed under the Apache License, Version 2.0 (the "License"); you may
	* not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
	* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*
	* This file is part of mbed TLS (https://tls.mbed.org)
	*/
	/*
	* 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(MBEDTLS_CONFIG_FILE)
	#include "mbedtls/config.h"
	#else
	#include MBEDTLS_CONFIG_FILE
	#endif

	#if defined(MBEDTLS_MD4_C)

	#include "mbedtls/md4.h"

	#include <string.h>

	#if defined(MBEDTLS_SELF_TEST)
	#if defined(MBEDTLS_PLATFORM_C)
	#include "mbedtls/platform.h"
	#else
	#include <stdio.h>
	#define mbedtls_printf printf
	#endif /* MBEDTLS_PLATFORM_C */
	#endif /* MBEDTLS_SELF_TEST */

	#if !defined(MBEDTLS_MD4_ALT)

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

	/*
	* 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) ) & 0xFF ); \
	(b)[(i) + 1] = (unsigned char) ( ( (n) >> 8 ) & 0xFF ); \
	(b)[(i) + 2] = (unsigned char) ( ( (n) >> 16 ) & 0xFF ); \
	(b)[(i) + 3] = (unsigned char) ( ( (n) >> 24 ) & 0xFF ); \
	}
	#endif

	void mbedtls_md4_init( mbedtls_md4_context *ctx )
	{
	memset( ctx, 0, sizeof( mbedtls_md4_context ) );
	}

	void mbedtls_md4_free( mbedtls_md4_context *ctx )
	{
	if( ctx == NULL )
	return;

	mbedtls_zeroize( ctx, sizeof( mbedtls_md4_context ) );
	}

	void mbedtls_md4_clone( mbedtls_md4_context *dst,
	const mbedtls_md4_context *src )
	{
	dst = src;
	}

	/*
	* MD4 context setup
	*/
	int mbedtls_md4_starts_ret( mbedtls_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;

	return( 0 );
	}

	#if !defined(MBEDTLS_DEPRECATED_REMOVED)
	void mbedtls_md4_starts( mbedtls_md4_context *ctx )
	{
	mbedtls_md4_starts_ret( ctx );
	}
	#endif

	#if !defined(MBEDTLS_MD4_PROCESS_ALT)
	int mbedtls_internal_md4_process( mbedtls_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;

	return( 0 );
	}

	#if !defined(MBEDTLS_DEPRECATED_REMOVED)
	void mbedtls_md4_process( mbedtls_md4_context *ctx,
	const unsigned char data[64] )
	{
	mbedtls_internal_md4_process( ctx, data );
	}
	#endif
	#endif /* !MBEDTLS_MD4_PROCESS_ALT */

	/*
	* MD4 process buffer
	*/
	int mbedtls_md4_update_ret( mbedtls_md4_context *ctx,
	const unsigned char *input,
	size_t ilen )
	{
	int ret;
	size_t fill;
	uint32_t left;

	if( ilen == 0 )
	return( 0 );

	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 );

	if( ( ret = mbedtls_internal_md4_process( ctx, ctx->buffer ) ) != 0 )
	return( ret );

	input += fill;
	ilen -= fill;
	left = 0;
	}

	while( ilen >= 64 )
	{
	if( ( ret = mbedtls_internal_md4_process( ctx, input ) ) != 0 )
	return( ret );

	input += 64;
	ilen -= 64;
	}

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

	return( 0 );
	}

	#if !defined(MBEDTLS_DEPRECATED_REMOVED)
	void mbedtls_md4_update( mbedtls_md4_context *ctx,
	const unsigned char *input,
	size_t ilen )
	{
	mbedtls_md4_update_ret( ctx, input, ilen );
	}
	#endif

	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
	*/
	int mbedtls_md4_finish_ret( mbedtls_md4_context *ctx,
	unsigned char output[16] )
	{
	int ret;
	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 );

	ret = mbedtls_md4_update_ret( ctx, (unsigned char *)md4_padding, padn );
	if( ret != 0 )
	return( ret );

	if( ( ret = mbedtls_md4_update_ret( ctx, msglen, 8 ) ) != 0 )
	return( ret );


	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 );

	return( 0 );
	}

	#if !defined(MBEDTLS_DEPRECATED_REMOVED)
	void mbedtls_md4_finish( mbedtls_md4_context *ctx,
	unsigned char output[16] )
	{
	mbedtls_md4_finish_ret( ctx, output );
	}
	#endif

	#endif /* !MBEDTLS_MD4_ALT */

	/*
	* output = MD4( input buffer )
	*/
	int mbedtls_md4_ret( const unsigned char *input,
	size_t ilen,
	unsigned char output[16] )
	{
	int ret;
	mbedtls_md4_context ctx;

	mbedtls_md4_init( &ctx );

	if( ( ret = mbedtls_md4_starts_ret( &ctx ) ) != 0 )
	goto exit;

	if( ( ret = mbedtls_md4_update_ret( &ctx, input, ilen ) ) != 0 )
	goto exit;

	if( ( ret = mbedtls_md4_finish_ret( &ctx, output ) ) != 0 )
	goto exit;

	exit:
	mbedtls_md4_free( &ctx );

	return( ret );
	}

	#if !defined(MBEDTLS_DEPRECATED_REMOVED)
	void mbedtls_md4( const unsigned char *input,
	size_t ilen,
	unsigned char output[16] )
	{
	mbedtls_md4_ret( input, ilen, output );
	}
	#endif

	#if defined(MBEDTLS_SELF_TEST)

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

	static const size_t md4_test_strlen[7] =
	{
	0, 1, 3, 14, 26, 62, 80
	};

	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 mbedtls_md4_self_test( int verbose )
	{
	int i, ret = 0;
	unsigned char md4sum[16];

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

	ret = mbedtls_md4_ret( md4_test_str[i], md4_test_strlen[i], md4sum );
	if( ret != 0 )
	goto fail;

	if( memcmp( md4sum, md4_test_sum[i], 16 ) != 0 )
	{
	ret = 1;
	goto fail;
	}

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

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

	return( 0 );

	fail:
	if( verbose != 0 )
	mbedtls_printf( "failed\n" );

	return( ret );
	}

	#endif /* MBEDTLS_SELF_TEST */

	#endif /* MBEDTLS_MD4_C */