/*

 * MD5 functions

 *

 * Copyright (C) 2011-2024, Joachim Metz <joachim.metz@gmail.com>

 *

 * Refer to AUTHORS for acknowledgements.

 *

 * This program is free software: you can redistribute it and/or modify

 * it under the terms of the GNU Lesser General Public License as published by

 * the Free Software Foundation, either version 3 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 Lesser General Public License

 * along with this program.  If not, see <https://www.gnu.org/licenses/>.

 */

#include <common.h>

#include <byte_stream.h>

#include <memory.h>

#include <types.h>

#if defined( HAVE_LIBCRYPTO ) && defined( HAVE_OPENSSL_MD5_H )

#include <openssl/md5.h>

#elif defined( HAVE_LIBCRYPTO ) && defined( HAVE_OPENSSL_EVP_H )

#include <openssl/err.h>

#include <openssl/evp.h>

#endif

#include "libhmac_byte_stream.h"

#include "libhmac_definitions.h"

#include "libhmac_libcerror.h"

#include "libhmac_md5_context.h"

#if !defined( LIBHMAC_HAVE_MD5_SUPPORT )

/* RFC 1321 based MD5 functions

 */

/* TODO decription what these values are based on

 */

uint32_t libhmac_md5_context_fixed_constants[ 4 ] = {

  0x67452301UL, 0xefcdab89UL, 0x98badcfeUL, 0x10325476UL

};

/* The first 32-bits of the sines (in radians) of the first 64 integers [ 0, 63 ]

 */

uint32_t libhmac_md5_context_sines[ 64 ] = {

  0xd76aa478UL, 0xe8c7b756UL, 0x242070dbUL, 0xc1bdceeeUL,

  0xf57c0fafUL, 0x4787c62aUL, 0xa8304613UL, 0xfd469501UL,

  0x698098d8UL, 0x8b44f7afUL, 0xffff5bb1UL, 0x895cd7beUL,

  0x6b901122UL, 0xfd987193UL, 0xa679438eUL, 0x49b40821UL,

  0xf61e2562UL, 0xc040b340UL, 0x265e5a51UL, 0xe9b6c7aaUL,

  0xd62f105dUL, 0x02441453UL, 0xd8a1e681UL, 0xe7d3fbc8UL,

  0x21e1cde6UL, 0xc33707d6UL, 0xf4d50d87UL, 0x455a14edUL,

  0xa9e3e905UL, 0xfcefa3f8UL, 0x676f02d9UL, 0x8d2a4c8aUL,

  0xfffa3942UL, 0x8771f681UL, 0x6d9d6122UL, 0xfde5380cUL,

  0xa4beea44UL, 0x4bdecfa9UL, 0xf6bb4b60UL, 0xbebfbc70UL,

  0x289b7ec6UL, 0xeaa127faUL, 0xd4ef3085UL, 0x04881d05UL,

  0xd9d4d039UL, 0xe6db99e5UL, 0x1fa27cf8UL, 0xc4ac5665UL,

  0xf4292244UL, 0x432aff97UL, 0xab9423a7UL, 0xfc93a039UL,

  0x655b59c3UL, 0x8f0ccc92UL, 0xffeff47dUL, 0x85845dd1UL,

  0x6fa87e4fUL, 0xfe2ce6e0UL, 0xa3014314UL, 0x4e0811a1UL,

  0xf7537e82UL, 0xbd3af235UL, 0x2ad7d2bbUL, 0xeb86d391UL

};

/* The bit shifts

 */

uint8_t libhmac_md5_context_bit_shifts[ 64 ] = {

  7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22,

  5,  9, 14, 20, 5,  9, 14, 20, 5,  9, 14, 20, 5,  9, 14, 20,

  4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23,

  6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21

};

/* The 32-bit values indexes

 * [  0, 15 ] => index

 * [ 16, 31 ] => ( ( 5 x index ) + 1 ) mod 16

 * [ 32, 47 ] => ( ( 3 x index ) + 5 ) mod 16

 * [ 48, 63 ] => ( 7 x index ) mod 16

 */

uint8_t libhmac_md5_context_values_32bit_index[ 64 ] = {

  0, 1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15,

  1, 6, 11,  0,  5, 10, 15,  4,  9, 14,  3,  8, 13,  2,  7, 12,

  5, 8, 11, 14,  1,  4,  7, 10, 13,  0,  3,  6,  9, 12, 15,  2,

  0, 7, 14,  5, 12,  3, 10,  1,  8, 15,  6, 13,  4, 11,  2,  9

};

#define libhmac_md5_context_transform_unfolded_calculate_hash_value_round1( values_32bit, value_32bit_index, hash_values, hash_value_index0, hash_value_index1, hash_value_index2, hash_value_index3, block_index ) \

  hash_values[ hash_value_index0 ] += ( hash_values[ hash_value_index1 ] & hash_values[ hash_value_index2 ] ) \

                                    | ( ~( hash_values[ hash_value_index1 ] ) & hash_values[ hash_value_index3 ] ); \

  hash_values[ hash_value_index0 ] += values_32bit[ value_32bit_index ]; \

  hash_values[ hash_value_index0 ] += libhmac_md5_context_sines[ block_index ]; \

\

  hash_values[ hash_value_index0 ] = byte_stream_bit_rotate_left_32bit( \

                                      hash_values[ hash_value_index0 ],  \

                                      libhmac_md5_context_bit_shifts[ block_index ] ); \

\

  hash_values[ hash_value_index0 ] += hash_values[ hash_value_index1 ];

#define libhmac_md5_context_transform_unfolded_calculate_hash_value_round2( values_32bit, value_32bit_index, hash_values, hash_value_index0, hash_value_index1, hash_value_index2, hash_value_index3, block_index ) \

  hash_values[ hash_value_index0 ] += ( hash_values[ hash_value_index1 ] & hash_values[ hash_value_index3 ] ) \

                                    | ( hash_values[ hash_value_index2 ] & ~( hash_values[ hash_value_index3 ] ) ); \

  hash_values[ hash_value_index0 ] += values_32bit[ value_32bit_index ]; \

  hash_values[ hash_value_index0 ] += libhmac_md5_context_sines[ block_index ]; \

\

  hash_values[ hash_value_index0 ] = byte_stream_bit_rotate_left_32bit( \

                                      hash_values[ hash_value_index0 ],  \

                                      libhmac_md5_context_bit_shifts[ block_index ] ); \

\

  hash_values[ hash_value_index0 ] += hash_values[ hash_value_index1 ];

#define libhmac_md5_context_transform_unfolded_calculate_hash_value_round3( values_32bit, value_32bit_index, hash_values, hash_value_index0, hash_value_index1, hash_value_index2, hash_value_index3, block_index ) \

  hash_values[ hash_value_index0 ] += hash_values[ hash_value_index1 ] \

                                    ^ hash_values[ hash_value_index2 ] \

                                    ^ hash_values[ hash_value_index3 ]; \

  hash_values[ hash_value_index0 ] += values_32bit[ value_32bit_index ]; \

  hash_values[ hash_value_index0 ] += libhmac_md5_context_sines[ block_index ]; \

\

  hash_values[ hash_value_index0 ] = byte_stream_bit_rotate_left_32bit( \

                                      hash_values[ hash_value_index0 ],  \

                                      libhmac_md5_context_bit_shifts[ block_index ] ); \

\

  hash_values[ hash_value_index0 ] += hash_values[ hash_value_index1 ];

#define libhmac_md5_context_transform_unfolded_calculate_hash_value_round4( values_32bit, value_32bit_index, hash_values, hash_value_index0, hash_value_index1, hash_value_index2, hash_value_index3, block_index ) \

  hash_values[ hash_value_index0 ] += hash_values[ hash_value_index2 ] \

                                    ^ ( hash_values[ hash_value_index1 ] | ~( hash_values[ hash_value_index3 ] ) ); \

  hash_values[ hash_value_index0 ] += values_32bit[ value_32bit_index ]; \

  hash_values[ hash_value_index0 ] += libhmac_md5_context_sines[ block_index ]; \

\

  hash_values[ hash_value_index0 ] = byte_stream_bit_rotate_left_32bit( \

                                      hash_values[ hash_value_index0 ],  \

                                      libhmac_md5_context_bit_shifts[ block_index ] ); \

\

  hash_values[ hash_value_index0 ] += hash_values[ hash_value_index1 ];

#define libhmac_md5_context_transform_unfolded_calculate_hash_values( values_32bit, hash_values ) \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round1( values_32bit, 0, hash_values, 0, 1, 2, 3, 0 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round1( values_32bit, 1, hash_values, 3, 0, 1, 2, 1 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round1( values_32bit, 2, hash_values, 2, 3, 0, 1, 2 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round1( values_32bit, 3, hash_values, 1, 2, 3, 0, 3 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round1( values_32bit, 4, hash_values, 0, 1, 2, 3, 4 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round1( values_32bit, 5, hash_values, 3, 0, 1, 2, 5 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round1( values_32bit, 6, hash_values, 2, 3, 0, 1, 6 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round1( values_32bit, 7, hash_values, 1, 2, 3, 0, 7 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round1( values_32bit, 8, hash_values, 0, 1, 2, 3, 8 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round1( values_32bit, 9, hash_values, 3, 0, 1, 2, 9 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round1( values_32bit, 10, hash_values, 2, 3, 0, 1, 10 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round1( values_32bit, 11, hash_values, 1, 2, 3, 0, 11 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round1( values_32bit, 12, hash_values, 0, 1, 2, 3, 12 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round1( values_32bit, 13, hash_values, 3, 0, 1, 2, 13 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round1( values_32bit, 14, hash_values, 2, 3, 0, 1, 14 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round1( values_32bit, 15, hash_values, 1, 2, 3, 0, 15 ); \

\

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round2( values_32bit, 1, hash_values, 0, 1, 2, 3, 16 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round2( values_32bit, 6, hash_values, 3, 0, 1, 2, 17 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round2( values_32bit, 11, hash_values, 2, 3, 0, 1, 18 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round2( values_32bit, 0, hash_values, 1, 2, 3, 0, 19 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round2( values_32bit, 5, hash_values, 0, 1, 2, 3, 20 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round2( values_32bit, 10, hash_values, 3, 0, 1, 2, 21 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round2( values_32bit, 15, hash_values, 2, 3, 0, 1, 22 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round2( values_32bit, 4, hash_values, 1, 2, 3, 0, 23 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round2( values_32bit, 9, hash_values, 0, 1, 2, 3, 24 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round2( values_32bit, 14, hash_values, 3, 0, 1, 2, 25 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round2( values_32bit, 3, hash_values, 2, 3, 0, 1, 26 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round2( values_32bit, 8, hash_values, 1, 2, 3, 0, 27 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round2( values_32bit, 13, hash_values, 0, 1, 2, 3, 28 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round2( values_32bit, 2, hash_values, 3, 0, 1, 2, 29 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round2( values_32bit, 7, hash_values, 2, 3, 0, 1, 30 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round2( values_32bit, 12, hash_values, 1, 2, 3, 0, 31 ); \

\

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round3( values_32bit, 5, hash_values, 0, 1, 2, 3, 32 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round3( values_32bit, 8, hash_values, 3, 0, 1, 2, 33 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round3( values_32bit, 11, hash_values, 2, 3, 0, 1, 34 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round3( values_32bit, 14, hash_values, 1, 2, 3, 0, 35 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round3( values_32bit, 1, hash_values, 0, 1, 2, 3, 36 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round3( values_32bit, 4, hash_values, 3, 0, 1, 2, 37 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round3( values_32bit, 7, hash_values, 2, 3, 0, 1, 38 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round3( values_32bit, 10, hash_values, 1, 2, 3, 0, 39 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round3( values_32bit, 13, hash_values, 0, 1, 2, 3, 40 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round3( values_32bit, 0, hash_values, 3, 0, 1, 2, 41 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round3( values_32bit, 3, hash_values, 2, 3, 0, 1, 42 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round3( values_32bit, 6, hash_values, 1, 2, 3, 0, 43 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round3( values_32bit, 9, hash_values, 0, 1, 2, 3, 44 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round3( values_32bit, 12, hash_values, 3, 0, 1, 2, 45 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round3( values_32bit, 15, hash_values, 2, 3, 0, 1, 46 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round3( values_32bit, 2, hash_values, 1, 2, 3, 0, 47 ); \

\

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round4( values_32bit, 0, hash_values, 0, 1, 2, 3, 48 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round4( values_32bit, 7, hash_values, 3, 0, 1, 2, 49 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round4( values_32bit, 14, hash_values, 2, 3, 0, 1, 50 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round4( values_32bit, 5, hash_values, 1, 2, 3, 0, 51 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round4( values_32bit, 12, hash_values, 0, 1, 2, 3, 52 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round4( values_32bit, 3, hash_values, 3, 0, 1, 2, 53 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round4( values_32bit, 10, hash_values, 2, 3, 0, 1, 54 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round4( values_32bit, 1, hash_values, 1, 2, 3, 0, 55 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round4( values_32bit, 8, hash_values, 0, 1, 2, 3, 56 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round4( values_32bit, 15, hash_values, 3, 0, 1, 2, 57 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round4( values_32bit, 6, hash_values, 2, 3, 0, 1, 58 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round4( values_32bit, 13, hash_values, 1, 2, 3, 0, 59 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round4( values_32bit, 4, hash_values, 0, 1, 2, 3, 60 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round4( values_32bit, 11, hash_values, 3, 0, 1, 2, 61 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round4( values_32bit, 2, hash_values, 2, 3, 0, 1, 62 ); \

  libhmac_md5_context_transform_unfolded_calculate_hash_value_round4( values_32bit, 9, hash_values, 1, 2, 3, 0, 63 );

/* Calculates the MD5 of 64 byte sized blocks of data in a buffer

 * Returns the number of bytes used if successful or -1 on error

 */

ssize_t libhmac_md5_context_transform(

         libhmac_internal_md5_context_t *internal_context,

         const uint8_t *buffer,

         size_t size,

         libcerror_error_t **error )

{

  uint32_t hash_values[ 4 ];

  uint32_t values_32bit[ 16 ];

  static char *function     = "libhmac_md5_context_transform";

  size_t buffer_offset      = 0;

#if !defined( LIBHMAC_UNFOLLED_LOOPS )

  uint32_t hash_value       = 0;

  uint8_t block_index       = 0;

  uint8_t hash_values_index = 0;

  uint8_t value_32bit_index = 0;

#endif

  if( internal_context == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid internal context.",

     function );

    return( -1 );

  }

  if( buffer == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid buffer.",

     function );

    return( -1 );

  }

  if( size > (size_t) SSIZE_MAX )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_VALUE_EXCEEDS_MAXIMUM,

     "%s: invalid size value exceeds maximum.",

     function );

    return( -1 );

  }

  while( size >= LIBHMAC_MD5_BLOCK_SIZE )

  {

    if( memory_copy(

         hash_values,

         internal_context->hash_values,

         sizeof( uint32_t ) * 4 ) == NULL )

    {

      libcerror_error_set(

       error,

       LIBCERROR_ERROR_DOMAIN_MEMORY,

       LIBCERROR_MEMORY_ERROR_COPY_FAILED,

       "%s: unable to copy hash values.",

       function );

      goto on_error;

    }

#if defined( LIBHMAC_UNFOLLED_LOOPS )

    /* Break the block into 16 x 32-bit values

     */

    libhmac_byte_stream_copy_to_16x_uint32_little_endian(

     &( buffer[ buffer_offset ] ),

     values_32bit );

    buffer_offset += LIBHMAC_MD5_BLOCK_SIZE;

    /* Calculate the hash values for the 32-bit values

     */

    libhmac_md5_context_transform_unfolded_calculate_hash_values(

     values_32bit,

     hash_values );

    /* Update the hash values in the context

     */

    internal_context->hash_values[ 0 ] += hash_values[ 0 ];

    internal_context->hash_values[ 1 ] += hash_values[ 1 ];

    internal_context->hash_values[ 2 ] += hash_values[ 2 ];

    internal_context->hash_values[ 3 ] += hash_values[ 3 ];

#else

    /* Break the block into 16 x 32-bit values

     */

    for( value_32bit_index = 0;

         value_32bit_index < 16;

         value_32bit_index++ )

    {

      byte_stream_copy_to_uint32_little_endian(

       &( buffer[ buffer_offset ] ),

       values_32bit[ value_32bit_index ] );

      buffer_offset += sizeof( uint32_t );

    }

    /* Calculate the hash values for the 32-bit values

     */

    for( block_index = 0;

         block_index < 64;

         block_index++ )

    {

      if( block_index < 16 )

      {

        hash_values[ 0 ] += ( hash_values[ 1 ] & hash_values[ 2 ] )

                          | ( ~( hash_values[ 1 ] ) & hash_values[ 3 ] );

      }

      else if( block_index < 32 )

      {

        hash_values[ 0 ] += ( hash_values[ 1 ] & hash_values[ 3 ] )

                          | ( hash_values[ 2 ] & ~( hash_values[ 3 ] ) );

      }

      else if( block_index < 48 )

      {

        hash_values[ 0 ] += hash_values[ 1 ]

                          ^ hash_values[ 2 ]

                          ^ hash_values[ 3 ];

      }

      else

      {

        hash_values[ 0 ] += hash_values[ 2 ]

                          ^ ( hash_values[ 1 ] | ~( hash_values[ 3 ] ) );

      }

      value_32bit_index = libhmac_md5_context_values_32bit_index[ block_index ];

      hash_values[ 0 ] += values_32bit[ value_32bit_index ];

      hash_values[ 0 ] += libhmac_md5_context_sines[ block_index ];

      hash_values[ 0 ]  = byte_stream_bit_rotate_left_32bit(

                           hash_values[ 0 ],

                           libhmac_md5_context_bit_shifts[ block_index ] );

      hash_value        = hash_values[ 3 ];

      hash_values[ 3 ]  = hash_values[ 2 ];

      hash_values[ 2 ]  = hash_values[ 1 ];

      hash_values[ 1 ] += hash_values[ 0 ];

      hash_values[ 0 ]  = hash_value;

    }

    /* Update the hash values in the context

     */

    for( hash_values_index = 0;

         hash_values_index < 4;

         hash_values_index++ )

    {

      internal_context->hash_values[ hash_values_index ] += hash_values[ hash_values_index ];

    }

#endif /* defined( LIBHMAC_UNFOLLED_LOOPS ) */

    size -= LIBHMAC_MD5_BLOCK_SIZE;

  }

  /* Prevent sensitive data from leaking

   */

  if( memory_set(

       hash_values,

       0,

       sizeof( uint32_t ) * 4 ) == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_MEMORY,

     LIBCERROR_MEMORY_ERROR_SET_FAILED,

     "%s: unable to clear hash values.",

     function );

    goto on_error;

  }

  if( memory_set(

       values_32bit,

       0,

       sizeof( uint32_t ) * 16 ) == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_MEMORY,

     LIBCERROR_MEMORY_ERROR_SET_FAILED,

     "%s: unable to clear 32-bit values.",

     function );

    goto on_error;

  }

  return( (ssize_t) buffer_offset );

on_error:

  memory_set(

   values_32bit,

   0,

   sizeof( uint32_t ) * 16 );

  memory_set(

   hash_values,

   0,

   sizeof( uint32_t ) * 4 );

  return( -1 );

}

#endif /* !defined( LIBHMAC_HAVE_MD5_SUPPORT ) */

/* Creates a MD5 context

 * Make sure the value context is referencing, is set to NULL

 * Returns 1 if successful or -1 on error

 */

int libhmac_md5_context_initialize(

     libhmac_md5_context_t **context,

     libcerror_error_t **error )

{

  libhmac_internal_md5_context_t *internal_context = NULL;

  static char *function                            = "libhmac_md5_context_initialize";

#if defined( HAVE_LIBCRYPTO ) && defined( HAVE_OPENSSL_EVP_H ) && defined( HAVE_EVP_MD5 )

  const EVP_MD *evp_md_type                        = NULL;

#endif

  if( context == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid context.",

     function );

    return( -1 );

  }

  if( *context != NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_VALUE_ALREADY_SET,

     "%s: invalid context value already set.",

     function );

    return( -1 );

  }

  internal_context = memory_allocate_structure(

                      libhmac_internal_md5_context_t );

  if( internal_context == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_MEMORY,

     LIBCERROR_MEMORY_ERROR_INSUFFICIENT,

     "%s: unable to create context.",

     function );

    goto on_error;

  }

  if( memory_set(

       internal_context,

       0,

       sizeof( libhmac_internal_md5_context_t ) ) == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_MEMORY,

     LIBCERROR_MEMORY_ERROR_SET_FAILED,

     "%s: unable to clear context.",

     function );

    memory_free(

     internal_context );

    return( -1 );

  }

#if defined( HAVE_LIBCRYPTO ) && defined( HAVE_OPENSSL_MD5_H ) && defined( MD5_DIGEST_LENGTH )

  if( MD5_Init(

       &( internal_context->md5_context ) ) != 1 )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_INITIALIZE_FAILED,

     "%s: unable to initialize context.",

     function );

    goto on_error;

  }

#elif defined( HAVE_LIBCRYPTO ) && defined( HAVE_OPENSSL_EVP_H ) && defined( HAVE_EVP_MD5 )

#if defined( HAVE_EVP_MD_CTX_INIT )

  EVP_MD_CTX_init(

   &( internal_context->internal_evp_md_context ) );

  internal_context->evp_md_context = &( internal_context->internal_evp_md_context );

#else

  internal_context->evp_md_context = EVP_MD_CTX_new();

  if( internal_context->evp_md_context == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_INITIALIZE_FAILED,

     "%s: unable to create EVP message digest context.",

     function );

    goto on_error;

  }

#endif /* defined( HAVE_EVP_MD_CTX_INIT ) */

/* TODO use EVP_MD_fetch for EVP_DigestInit_ex2 */

  evp_md_type = EVP_md5();

#if defined( HAVE_EVP_DIGESTINIT_EX2 )

  if( EVP_DigestInit_ex2(

       internal_context->evp_md_context,

       evp_md_type,

       NULL ) != 1 )

#else

  if( EVP_DigestInit_ex(

       internal_context->evp_md_context,

       evp_md_type,

       NULL ) != 1 )

#endif

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_INITIALIZE_FAILED,

     "%s: unable to initialize EVP message digest context.",

     function );

#if defined( HAVE_EVP_MD_CTX_CLEANUP )

    EVP_MD_CTX_cleanup(

     &( internal_context->internal_evp_md_context ) );

    ERR_remove_thread_state(

     NULL );

#else

    EVP_MD_CTX_free(

     internal_context->evp_md_context );

#endif

    internal_context->evp_md_context = NULL;

    goto on_error;

  }

#else

  if( memory_copy(

       internal_context->hash_values,

       libhmac_md5_context_fixed_constants,

       sizeof( uint32_t ) * 4 ) == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_MEMORY,

     LIBCERROR_MEMORY_ERROR_COPY_FAILED,

     "%s: unable to copy fixed constants to hash values.",

     function );

    goto on_error;

  }

#endif /* defined( HAVE_LIBCRYPTO ) && defined( HAVE_OPENSSL_MD5_H ) && defined( MD5_DIGEST_LENGTH ) */

  *context = (libhmac_md5_context_t *) internal_context;

  return( 1 );

on_error:

  if( internal_context != NULL )

  {

    memory_free(

     internal_context );

  }

  return( -1 );

}

/* Frees a MD5 context

 * Returns 1 if successful or -1 on error

 */

int libhmac_md5_context_free(

     libhmac_md5_context_t **context,

     libcerror_error_t **error )

{

  libhmac_internal_md5_context_t *internal_context = NULL;

  static char *function                            = "libhmac_md5_context_free";

  if( context == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid context.",

     function );

    return( -1 );

  }

  if( *context != NULL )

  {

    internal_context = (libhmac_internal_md5_context_t *) *context;

    *context         = NULL;

#if defined( HAVE_LIBCRYPTO ) && defined( HAVE_OPENSSL_MD5_H ) && defined( MD5_DIGEST_LENGTH )

    /* No additional clean up necessary

     */

#elif defined( HAVE_LIBCRYPTO ) && defined( HAVE_OPENSSL_EVP_H ) && defined( HAVE_EVP_MD5 )

#if defined( HAVE_EVP_MD_CTX_CLEANUP )

    if( EVP_MD_CTX_cleanup(

         &( internal_context->internal_evp_md_context ) ) != 1 )

    {

      libcerror_error_set(

       error,

       LIBCERROR_ERROR_DOMAIN_RUNTIME,

       LIBCERROR_RUNTIME_ERROR_FINALIZE_FAILED,

       "%s: unable to clean up EVP message digest context.",

       function );

    }

    /* Make sure the error state is removed otherwise OpenSSL will leak memory

     */

    ERR_remove_thread_state(

     NULL );

#else

    EVP_MD_CTX_free(

     internal_context->evp_md_context );

#endif /* defined( HAVE_EVP_MD_CTX_CLEANUP ) */

    internal_context->evp_md_context = NULL;

#else

    /* No additional clean up necessary

     */

#endif /* defined( HAVE_LIBCRYPTO ) && defined( HAVE_OPENSSL_MD5_H ) && defined( MD5_DIGEST_LENGTH ) */

    memory_free(

     internal_context );

  }

  return( 1 );

}

#if defined( HAVE_LIBCRYPTO ) && defined( HAVE_OPENSSL_MD5_H ) && defined( MD5_DIGEST_LENGTH )

/* Updates the MD5 context using OpenSSL

 * Returns 1 if successful or -1 on error

 */

int libhmac_md5_context_update(

     libhmac_md5_context_t *context,

     const uint8_t *buffer,

     size_t size,

     libcerror_error_t **error )

{

  libhmac_internal_md5_context_t *internal_context = NULL;

  static char *function                            = "libhmac_md5_context_update";

  unsigned long safe_hash_size                     = 0;

  if( context == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid context.",

     function );

    return( -1 );

  }

  internal_context = (libhmac_internal_md5_context_t *) context;

  if( buffer == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid buffer.",

     function );

    return( -1 );

  }

#if ( SIZEOF_LONG < SIZEOF_SIZE_T )

  if( size > (size_t) ULONG_MAX )

#else

  if( size > (size_t) SSIZE_MAX )

#endif

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_VALUE_EXCEEDS_MAXIMUM,

     "%s: invalid size value exceeds maximum.",

     function );

    return( -1 );

  }

  if( size == 0 )

  {

    return( 1 );

  }

  safe_hash_size = (unsigned long) size;

  if( MD5_Update(

       &( internal_context->md5_context ),

       (const void *) buffer,

       size ) != 1 )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_SET_FAILED,

     "%s: unable to update context.",

     function );

    return( -1 );

  }

  return( 1 );

}

#elif defined( HAVE_LIBCRYPTO ) && defined( HAVE_OPENSSL_EVP_H ) && defined( HAVE_EVP_MD5 )

/* Updates the MD5 context using OpenSSL EVP

 * Returns 1 if successful or -1 on error

 */

int libhmac_md5_context_update(

     libhmac_md5_context_t *context,

     const uint8_t *buffer,

     size_t size,

     libcerror_error_t **error )

{

  libhmac_internal_md5_context_t *internal_context = NULL;

  static char *function                            = "libhmac_md5_context_update";

  if( context == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid context.",

     function );

    return( -1 );

  }

  internal_context = (libhmac_internal_md5_context_t *) context;

  if( buffer == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid buffer.",

     function );

    return( -1 );

  }

  if( size > (size_t) SSIZE_MAX )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_VALUE_EXCEEDS_MAXIMUM,

     "%s: invalid size value exceeds maximum.",

     function );

    return( -1 );

  }

  if( size == 0 )

  {

    return( 1 );

  }

  if( EVP_DigestUpdate(

       internal_context->evp_md_context,

       (const void *) buffer,

       size ) != 1 )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_SET_FAILED,

     "%s: unable to update context.",

     function );

    return( -1 );

  }

  return( 1 );

}

#else

/* Updates the MD5 context using fallback implementation

 * Returns 1 if successful or -1 on error

 */

int libhmac_md5_context_update(

     libhmac_md5_context_t *context,

     const uint8_t *buffer,

     size_t size,

     libcerror_error_t **error )

{

  libhmac_internal_md5_context_t *internal_context = NULL;

  static char *function                            = "libhmac_md5_context_update";

  size_t buffer_offset                             = 0;

  size_t remaining_block_size                      = 0;

  ssize_t process_count                            = 0;

  if( context == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid context.",

     function );

    return( -1 );

  }

  internal_context = (libhmac_internal_md5_context_t *) context;

  if( buffer == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid buffer.",

     function );

    return( -1 );

  }

  if( size > (size_t) SSIZE_MAX )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_VALUE_EXCEEDS_MAXIMUM,

     "%s: invalid size value exceeds maximum.",

     function );

    return( -1 );

  }

  if( size == 0 )

  {

    return( 1 );

  }

  if( internal_context->block_offset > 0 )

  {

    if( internal_context->block_offset >= LIBHMAC_MD5_BLOCK_SIZE )

    {

      libcerror_error_set(

       error,

       LIBCERROR_ERROR_DOMAIN_RUNTIME,

       LIBCERROR_RUNTIME_ERROR_VALUE_OUT_OF_BOUNDS,

       "%s: invalid context - block offset value out of bounds.",

       function );

      return( -1 );

    }

    remaining_block_size = LIBHMAC_MD5_BLOCK_SIZE - internal_context->block_offset;

    if( remaining_block_size > size )

    {

      remaining_block_size = size;

    }

    if( memory_copy(

         &( internal_context->block[ internal_context->block_offset ] ),

         buffer,

         remaining_block_size ) == NULL )

    {

      libcerror_error_set(

       error,

       LIBCERROR_ERROR_DOMAIN_MEMORY,

       LIBCERROR_MEMORY_ERROR_COPY_FAILED,

       "%s: unable to copy data to context block.",

       function );

      return( -1 );

    }

    internal_context->block_offset += remaining_block_size;

    if( internal_context->block_offset < LIBHMAC_MD5_BLOCK_SIZE )

    {

      return( 1 );

    }

    buffer_offset += remaining_block_size;

    size          -= remaining_block_size;

    process_count = libhmac_md5_context_transform(

                     internal_context,

                     internal_context->block,

                     LIBHMAC_MD5_BLOCK_SIZE,

                     error );

    if( process_count == -1 )

    {

      libcerror_error_set(

       error,

       LIBCERROR_ERROR_DOMAIN_RUNTIME,

       LIBCERROR_RUNTIME_ERROR_SET_FAILED,

       "%s: unable to transform context block.",

       function );

      return( -1 );

    }

    internal_context->hash_count  += process_count;

    internal_context->block_offset = 0;

  }

  if( size > 0 )

  {

    process_count = libhmac_md5_context_transform(

                     internal_context,

                     &( buffer[ buffer_offset ] ),

                     size,

                     error );

    if( process_count == -1 )

    {

      libcerror_error_set(

       error,

       LIBCERROR_ERROR_DOMAIN_RUNTIME,

       LIBCERROR_RUNTIME_ERROR_SET_FAILED,

       "%s: unable to transform buffer.",

       function );

      return( -1 );

    }

    internal_context->hash_count += process_count;

    buffer_offset += process_count;

    size          -= process_count;

  }

  if( size > 0 )

  {

    if( size >= LIBHMAC_MD5_BLOCK_SIZE )

    {

      libcerror_error_set(

       error,

       LIBCERROR_ERROR_DOMAIN_RUNTIME,

       LIBCERROR_RUNTIME_ERROR_VALUE_OUT_OF_BOUNDS,

       "%s: invalid size value out of bounds.",

       function );

      return( -1 );

    }

    if( memory_copy(

         internal_context->block,

         &( buffer[ buffer_offset ] ),

         size ) == NULL )

    {

      libcerror_error_set(

       error,

       LIBCERROR_ERROR_DOMAIN_MEMORY,

       LIBCERROR_MEMORY_ERROR_COPY_FAILED,

       "%s: unable to copy remaining data to context block.",

       function );

      return( -1 );

    }

    internal_context->block_offset = size;

  }

  return( 1 );

}

#endif /* defined( HAVE_LIBCRYPTO ) && defined( HAVE_OPENSSL_MD5_H ) && defined( MD5_DIGEST_LENGTH ) */

#if defined( HAVE_LIBCRYPTO ) && defined( HAVE_OPENSSL_MD5_H ) && defined( MD5_DIGEST_LENGTH )

/* Finalizes the MD5 context using OpenSSL

 * Returns 1 if successful or -1 on error

 */

int libhmac_md5_context_finalize(

     libhmac_md5_context_t *context,

     uint8_t *hash,

     size_t hash_size,

     libcerror_error_t **error )

{

  libhmac_internal_md5_context_t *internal_context = NULL;

  static char *function                            = "libhmac_md5_context_finalize";

  if( context == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid context.",

     function );

    return( -1 );

  }

  internal_context = (libhmac_internal_md5_context_t *) context;

  if( hash == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid hash.",

     function );

    return( -1 );

  }

  if( hash_size > (size_t) SSIZE_MAX )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_VALUE_EXCEEDS_MAXIMUM,

     "%s: invalid hash size value exceeds maximum.",

     function );

    return( -1 );

  }

  if( hash_size < (size_t) LIBHMAC_MD5_HASH_SIZE )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_VALUE_TOO_SMALL,

     "%s: invalid hash size value too small.",

     function );