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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  * Triple-DES key schedule (112-bit, encryption)
  83  */
  84 int des3_set2key_enc( des3_context *ctx, const unsigned char key[DES_KEY_SIZE * 2] );
  85
  86 /*
  87  * Triple-DES key schedule (112-bit, decryption)
  88  */
  89 int des3_set2key_dec( des3_context *ctx, const unsigned char key[DES_KEY_SIZE * 2] );
  90
  91 /*
  92  * Triple-DES key schedule (168-bit, encryption)
  93  */
  94 int des3_set3key_enc( des3_context *ctx, const unsigned char key[DES_KEY_SIZE * 3] );
  95
  96 /*
  97  * Triple-DES key schedule (168-bit, decryption)
  98  */
  99 int des3_set3key_dec( des3_context *ctx, const unsigned char key[DES_KEY_SIZE * 3] );
 100
 101 /**
 102  * \brief          Set key parity on the given key to odd.
 103  *
 104  *                 DES keys are 56 bits long, but each byte is padded with
 105  *                 a parity bit to allow verification.
 106  *
 107  * \param key      8-byte secret key
 108  */
 109 void des_key_set_parity( unsigned char key[DES_KEY_SIZE] );
 110
 111 /**
 112  * \brief          Check that key parity on the given key is odd.
 113  *
 114  *                 DES keys are 56 bits long, but each byte is padded with
 115  *                 a parity bit to allow verification.
 116  *
 117  * \param key      8-byte secret key
 118  *
 119  * \return         0 is parity was ok, 1 if parity was not correct.
 120  */
 121 int des_key_check_key_parity( const unsigned char key[DES_KEY_SIZE] );
 122
 123 /**
 124  * \brief          Check that key is not a weak or semi-weak DES key
 125  *
 126  * \param key      8-byte secret key
 127  *
 128  * \return         0 if no weak key was found, 1 if a weak key was identified.
 129  */
 130 int des_key_check_weak( const unsigned char key[DES_KEY_SIZE] );
 131
 132 /**
 133  * \brief          DES key schedule (56-bit, encryption)
 134  *
 135  * \param ctx      DES context to be initialized
 136  * \param key      8-byte secret key
 137  *
 138  * \return         0
 139  */
 140 int des_setkey_enc( des_context *ctx, const unsigned char key[DES_KEY_SIZE] );
 141
 142 /**
 143  * \brief          DES key schedule (56-bit, decryption)
 144  *
 145  * \param ctx      DES context to be initialized
 146  * \param key      8-byte secret key
 147  *
 148  * \return         0
 149  */
 150 int des_setkey_dec( des_context *ctx, const unsigned char key[DES_KEY_SIZE] );
 151
 152 /**
 153  * \brief          Triple-DES key schedule (112-bit, encryption)
 154  *
 155  * \param ctx      3DES context to be initialized
 156  * \param key      16-byte secret key
 157  *
 158  * \return         0
 159  */
 160 int des3_set2key_enc( des3_context *ctx, const unsigned char key[DES_KEY_SIZE * 2] );
 161
 162 /**
 163  * \brief          Triple-DES key schedule (112-bit, decryption)
 164  *
 165  * \param ctx      3DES context to be initialized
 166  * \param key      16-byte secret key
 167  *
 168  * \return         0
 169  */
 170 int des3_set2key_dec( des3_context *ctx, const unsigned char key[DES_KEY_SIZE * 2] );
 171
 172 /**
 173  * \brief          Triple-DES key schedule (168-bit, encryption)
 174  *
 175  * \param ctx      3DES context to be initialized
 176  * \param key      24-byte secret key
 177  *
 178  * \return         0
 179  */
 180 int des3_set3key_enc( des3_context *ctx, const unsigned char key[DES_KEY_SIZE * 3] );
 181
 182 /**
 183  * \brief          Triple-DES key schedule (168-bit, decryption)
 184  *
 185  * \param ctx      3DES context to be initialized
 186  * \param key      24-byte secret key
 187  *
 188  * \return         0
 189  */
 190 int des3_set3key_dec( des3_context *ctx, const unsigned char key[DES_KEY_SIZE * 3] );
 191
 192 /**
 193  * \brief          DES-ECB block encryption/decryption
 194  *
 195  * \param ctx      DES context
 196  * \param input    64-bit input block
 197  * \param output   64-bit output block
 198  *
 199  * \return         0 if successful
 200  */
 201 int des_crypt_ecb( des_context *ctx,
 202                                         const unsigned char input[8],
 203                                         unsigned char output[8] );
 204
 205 #if defined(POLARSSL_CIPHER_MODE_CBC)
 206 /**
 207  * \brief          DES-CBC buffer encryption/decryption
 208  *
 209  * \param ctx      DES context
 210  * \param mode     DES_ENCRYPT or DES_DECRYPT
 211  * \param length   length of the input data
 212  * \param iv       initialization vector (updated after use)
 213  * \param input    buffer holding the input data
 214  * \param output   buffer holding the output data
 215  */
 216 int des_crypt_cbc( des_context *ctx,
 217                                         int mode,
 218                                         size_t length,
 219                                         unsigned char iv[8],
 220                                         const unsigned char *input,
 221                                         unsigned char *output );
 222 #endif /* POLARSSL_CIPHER_MODE_CBC */
 223
 224 /**
 225  * \brief          3DES-ECB block encryption/decryption
 226  *
 227  * \param ctx      3DES context
 228  * \param input    64-bit input block
 229  * \param output   64-bit output block
 230  *
 231  * \return         0 if successful
 232  */
 233 int des3_crypt_ecb( des3_context *ctx,
 234                                          const unsigned char input[8],
 235                                          unsigned char output[8] );
 236
 237 #if defined(POLARSSL_CIPHER_MODE_CBC)
 238 /**
 239  * \brief          3DES-CBC buffer encryption/decryption
 240  *
 241  * \param ctx      3DES context
 242  * \param mode     DES_ENCRYPT or DES_DECRYPT
 243  * \param length   length of the input data
 244  * \param iv       initialization vector (updated after use)
 245  * \param input    buffer holding the input data
 246  * \param output   buffer holding the output data
 247  *
 248  * \return         0 if successful, or POLARSSL_ERR_DES_INVALID_INPUT_LENGTH
 249  */
 250 int des3_crypt_cbc( des3_context *ctx,
 251                                          int mode,
 252                                          size_t length,
 253                                          unsigned char iv[8],
 254                                          const unsigned char *input,
 255                                          unsigned char *output );
 256 #endif /* POLARSSL_CIPHER_MODE_CBC */
 257
 258 #ifdef __cplusplus
 259 }
 260 #endif
 261
 262 #else  /* POLARSSL_DES_ALT */
 263 #include "des_alt.h"
 264 #endif /* POLARSSL_DES_ALT */
 265
 266 #ifdef __cplusplus
 267 extern "C" {
 268 #endif
 269
 270 /**
 271  * \brief          Checkup routine
 272  *
 273  * \return         0 if successful, or 1 if the test failed
 274  */
 275 int des_self_test( int verbose );
 276
 277 #ifdef __cplusplus
 278 }
 279 #endif
 280
 281 #endif /* des.h */