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   1 /**
   2  * \file des.h
   3  *
   4  * \brief DES block cipher
   5  *
   6  *  Copyright (C) 2006-2013, Brainspark B.V.
   7  *
   8  *  This file is part of PolarSSL (http://www.polarssl.org)
   9  *  Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
  10  *
  11  *  All rights reserved.
  12  *
  13  *  This program is free software; you can redistribute it and/or modify
  14  *  it under the terms of the GNU General Public License as published by
  15  *  the Free Software Foundation; either version 2 of the License, or
  16  *  (at your option) any later version.
  17  *
  18  *  This program is distributed in the hope that it will be useful,
  19  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  *  GNU General Public License for more details.
  22  *
  23  *  You should have received a copy of the GNU General Public License along
  24  *  with this program; if not, write to the Free Software Foundation, Inc.,
  25  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  26  */
  27 #ifndef POLARSSL_DES_H
  28 #define POLARSSL_DES_H
  29
  30 //#include "config.h"
  31 /**
  32  * \def POLARSSL_CIPHER_MODE_CBC
  33  *
  34  * Enable Cipher Block Chaining mode (CBC) for symmetric ciphers.
  35  */
  36 #define POLARSSL_CIPHER_MODE_CBC
  37
  38 #include <string.h>
  39
  40 #if defined(_MSC_VER) && !defined(EFIX64) && !defined(EFI32)
  41 #include <basetsd.h>
  42 typedef UINT32 uint32_t;
  43 #else
  44 #include <inttypes.h>
  45 #endif
  46
  47 #define DES_ENCRYPT     1
  48 #define DES_DECRYPT     0
  49
  50 #define POLARSSL_ERR_DES_INVALID_INPUT_LENGTH              -0x0032  /**< The data input has an invalid length. */
  51
  52 #define DES_KEY_SIZE    8
  53
  54 #if !defined(POLARSSL_DES_ALT)
  55 // Regular implementation
  56 //
  57
  58 #ifdef __cplusplus
  59 extern "C" {
  60 #endif
  61
  62 /**
  63  * \brief          DES context structure
  64  */
  65 typedef struct
  66 {
  67         int mode;                   /*!<  encrypt/decrypt   */
  68         uint32_t sk[32];            /*!<  DES subkeys       */
  69 }
  70 des_context;
  71
  72 /**
  73  * \brief          Triple-DES context structure
  74  */
  75 typedef struct
  76 {
  77         int mode;                   /*!<  encrypt/decrypt   */
  78         uint32_t sk[96];            /*!<  3DES subkeys      */
  79 }
  80 des3_context;
  81
  82 /**
  83  * \brief          Set key parity on the given key to odd.
  84  *
  85  *                 DES keys are 56 bits long, but each byte is padded with
  86  *                 a parity bit to allow verification.
  87  *
  88  * \param key      8-byte secret key
  89  */
  90 void des_key_set_parity( unsigned char key[DES_KEY_SIZE] );
  91
  92 /**
  93  * \brief          Check that key parity on the given key is odd.
  94  *
  95  *                 DES keys are 56 bits long, but each byte is padded with
  96  *                 a parity bit to allow verification.
  97  *
  98  * \param key      8-byte secret key
  99  *
 100  * \return         0 is parity was ok, 1 if parity was not correct.
 101  */
 102 int des_key_check_key_parity( const unsigned char key[DES_KEY_SIZE] );
 103
 104 /**
 105  * \brief          Check that key is not a weak or semi-weak DES key
 106  *
 107  * \param key      8-byte secret key
 108  *
 109  * \return         0 if no weak key was found, 1 if a weak key was identified.
 110  */
 111 int des_key_check_weak( const unsigned char key[DES_KEY_SIZE] );
 112
 113 /**
 114  * \brief          DES key schedule (56-bit, encryption)
 115  *
 116  * \param ctx      DES context to be initialized
 117  * \param key      8-byte secret key
 118  *
 119  * \return         0
 120  */
 121 int des_setkey_enc( des_context *ctx, const unsigned char key[DES_KEY_SIZE] );
 122
 123 /**
 124  * \brief          DES key schedule (56-bit, decryption)
 125  *
 126  * \param ctx      DES context to be initialized
 127  * \param key      8-byte secret key
 128  *
 129  * \return         0
 130  */
 131 int des_setkey_dec( des_context *ctx, const unsigned char key[DES_KEY_SIZE] );
 132
 133 /**
 134  * \brief          Triple-DES key schedule (112-bit, encryption)
 135  *
 136  * \param ctx      3DES context to be initialized
 137  * \param key      16-byte secret key
 138  *
 139  * \return         0
 140  */
 141 int des3_set2key_enc( des3_context *ctx, const unsigned char key[DES_KEY_SIZE * 2] );
 142
 143 /**
 144  * \brief          Triple-DES key schedule (112-bit, decryption)
 145  *
 146  * \param ctx      3DES context to be initialized
 147  * \param key      16-byte secret key
 148  *
 149  * \return         0
 150  */
 151 int des3_set2key_dec( des3_context *ctx, const unsigned char key[DES_KEY_SIZE * 2] );
 152
 153 /**
 154  * \brief          Triple-DES key schedule (168-bit, encryption)
 155  *
 156  * \param ctx      3DES context to be initialized
 157  * \param key      24-byte secret key
 158  *
 159  * \return         0
 160  */
 161 int des3_set3key_enc( des3_context *ctx, const unsigned char key[DES_KEY_SIZE * 3] );
 162
 163 /**
 164  * \brief          Triple-DES key schedule (168-bit, decryption)
 165  *
 166  * \param ctx      3DES context to be initialized
 167  * \param key      24-byte secret key
 168  *
 169  * \return         0
 170  */
 171 int des3_set3key_dec( des3_context *ctx, const unsigned char key[DES_KEY_SIZE * 3] );
 172
 173 /**
 174  * \brief          DES-ECB block encryption/decryption
 175  *
 176  * \param ctx      DES context
 177  * \param input    64-bit input block
 178  * \param output   64-bit output block
 179  *
 180  * \return         0 if successful
 181  */
 182 int des_crypt_ecb( des_context *ctx,
 183                                         const unsigned char input[8],
 184                                         unsigned char output[8] );
 185
 186 #if defined(POLARSSL_CIPHER_MODE_CBC)
 187 /**
 188  * \brief          DES-CBC buffer encryption/decryption
 189  *
 190  * \param ctx      DES context
 191  * \param mode     DES_ENCRYPT or DES_DECRYPT
 192  * \param length   length of the input data
 193  * \param iv       initialization vector (updated after use)
 194  * \param input    buffer holding the input data
 195  * \param output   buffer holding the output data
 196  */
 197 int des_crypt_cbc( des_context *ctx,
 198                                         int mode,
 199                                         size_t length,
 200                                         unsigned char iv[8],
 201                                         const unsigned char *input,
 202                                         unsigned char *output );
 203 #endif /* POLARSSL_CIPHER_MODE_CBC */
 204
 205 /**
 206  * \brief          3DES-ECB block encryption/decryption
 207  *
 208  * \param ctx      3DES context
 209  * \param input    64-bit input block
 210  * \param output   64-bit output block
 211  *
 212  * \return         0 if successful
 213  */
 214 int des3_crypt_ecb( des3_context *ctx,
 215                                          const unsigned char input[8],
 216                                          unsigned char output[8] );
 217
 218 #if defined(POLARSSL_CIPHER_MODE_CBC)
 219 /**
 220  * \brief          3DES-CBC buffer encryption/decryption
 221  *
 222  * \param ctx      3DES context
 223  * \param mode     DES_ENCRYPT or DES_DECRYPT
 224  * \param length   length of the input data
 225  * \param iv       initialization vector (updated after use)
 226  * \param input    buffer holding the input data
 227  * \param output   buffer holding the output data
 228  *
 229  * \return         0 if successful, or POLARSSL_ERR_DES_INVALID_INPUT_LENGTH
 230  */
 231 int des3_crypt_cbc( des3_context *ctx,
 232                                          int mode,
 233                                          size_t length,
 234                                          unsigned char iv[8],
 235                                          const unsigned char *input,
 236                                          unsigned char *output );
 237 #endif /* POLARSSL_CIPHER_MODE_CBC */
 238
 239 #ifdef __cplusplus
 240 }
 241 #endif
 242
 243 #else  /* POLARSSL_DES_ALT */
 244 #include "des_alt.h"
 245 #endif /* POLARSSL_DES_ALT */
 246
 247 #ifdef __cplusplus
 248 extern "C" {
 249 #endif
 250
 251 /**
 252  * \brief          Checkup routine
 253  *
 254  * \return         0 if successful, or 1 if the test failed
 255  */
 256 int des_self_test( int verbose );
 257
 258 #ifdef __cplusplus
 259 }
 260 #endif
 261
 262 #endif /* des.h */