include/tropicssl/aes.h

   1 /**
   2  * \file aes.h
   3  *
   4  *  Based on XySSL: Copyright (C) 2006-2008  Christophe Devine
   5  *
   6  *  Copyright (C) 2009  Paul Bakker <polarssl_maintainer at polarssl dot org>
   7  *
   8  *  All rights reserved.
   9  *
  10  *  Redistribution and use in source and binary forms, with or without
  11  *  modification, are permitted provided that the following conditions
  12  *  are met:
  13  *
  14  *    * Redistributions of source code must retain the above copyright
  15  *      notice, this list of conditions and the following disclaimer.
  16  *    * Redistributions in binary form must reproduce the above copyright
  17  *      notice, this list of conditions and the following disclaimer in the
  18  *      documentation and/or other materials provided with the distribution.
  19  *    * Neither the names of PolarSSL or XySSL nor the names of its contributors
  20  *      may be used to endorse or promote products derived from this software
  21  *      without specific prior written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  24  *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  25  *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  26  *  FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  27  *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  28  *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
  29  *  TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  30  *  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  */
  35 #ifndef TROPICSSL_AES_H
  36 #define TROPICSSL_AES_H
  37
  38 #define AES_ENCRYPT     1
  39 #define AES_DECRYPT     0
  40
  41 /**
  42  * \brief          AES context structure
  43  */
  44 typedef struct {
  45         int nr;                 /*!<  number of rounds  */
  46         unsigned long *rk;      /*!<  AES round keys    */
  47         unsigned long buf[68];  /*!<  unaligned data    */
  48 } aes_context;
  49
  50 #ifdef __cplusplus
  51 extern "C" {
  52 #endif
  53
  54         /**
  55          * \brief          AES key schedule (encryption)
  56          *
  57          * \param ctx      AES context to be initialized
  58          * \param key      encryption key
  59          * \param keysize  must be 128, 192 or 256
  60          */
  61         void aes_setkey_enc(aes_context * ctx, const unsigned char *key, int keysize);
  62
  63         /**
  64          * \brief          AES key schedule (decryption)
  65          *
  66          * \param ctx      AES context to be initialized
  67          * \param key      decryption key
  68          * \param keysize  must be 128, 192 or 256
  69          */
  70         void aes_setkey_dec(aes_context * ctx, const unsigned char *key, int keysize);
  71
  72         /**
  73          * \brief          AES-ECB block encryption/decryption
  74          *
  75          * \param ctx      AES context
  76          * \param mode     AES_ENCRYPT or AES_DECRYPT
  77          * \param input    16-byte input block
  78          * \param output   16-byte output block
  79          */
  80         void aes_crypt_ecb(aes_context * ctx,
  81                            int mode,
  82                            const unsigned char input[16],
  83                            unsigned char output[16]);
  84
  85         /**
  86          * \brief          AES-CBC buffer encryption/decryption
  87          *
  88          * \param ctx      AES context
  89          * \param mode     AES_ENCRYPT or AES_DECRYPT
  90          * \param length   length of the input data
  91          * \param iv       initialization vector (updated after use)
  92          * \param input    buffer holding the input data
  93          * \param output   buffer holding the output data
  94          */
  95         void aes_crypt_cbc(aes_context * ctx,
  96                            int mode,
  97                            int length,
  98                            unsigned char iv[16],
  99                            const unsigned char *input,
 100                            unsigned char *output);
 101
 102         /**
 103          * \brief          AES-CFB128 buffer encryption/decryption
 104          *
 105          * \param ctx      AES context
 106          * \param mode     AES_ENCRYPT or AES_DECRYPT
 107          * \param length   length of the input data
 108          * \param iv_off   offset in IV (updated after use)
 109          * \param iv       initialization vector (updated after use)
 110          * \param input    buffer holding the input data
 111          * \param output   buffer holding the output data
 112          */
 113         void aes_crypt_cfb128(aes_context * ctx,
 114                               int mode,
 115                               int length,
 116                               int *iv_off,
 117                               unsigned char iv[16],
 118                               const unsigned char *input,
 119                               unsigned char *output);
 120
 121         /**
 122          * \brief          Checkup routine
 123          *
 124          * \return         0 if successful, or 1 if the test failed
 125          */
 126         int aes_self_test(int verbose);
 127
 128 #ifdef __cplusplus
 129 }
 130 #endif
 131 #endif                          /* aes.h */