1 /* crypto/evp/e_rc5.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 
  59 #include <stdio.h>
  60 #include "cryptlib.h"
  61 
  62 #ifndef OPENSSL_NO_RC5
  63 
  64 #include <openssl/evp.h>
  65 #include <openssl/objects.h>
  66 #include "evp_locl.h"
  67 #include <openssl/rc5.h>
  68 
  69 static int r_32_12_16_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  70                                const unsigned char *iv,int enc);
  71 static int rc5_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);
  72 
  73 typedef struct
  74         {
  75         int rounds;     /* number of rounds */
  76         RC5_32_KEY ks;  /* key schedule */
  77         } EVP_RC5_KEY;
  78 
  79 #define data(ctx)       EVP_C_DATA(EVP_RC5_KEY,ctx)
  80 
  81 IMPLEMENT_BLOCK_CIPHER(rc5_32_12_16, ks, RC5_32, EVP_RC5_KEY, NID_rc5,
  82                        8, RC5_32_KEY_LENGTH, 8, 64,
  83                        EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
  84                        r_32_12_16_init_key, NULL,
  85                        NULL, NULL, rc5_ctrl)
  86 
  87 static int rc5_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
  88         {
  89         switch(type)
  90                 {
  91         case EVP_CTRL_INIT:
  92                 data(c)->rounds = RC5_12_ROUNDS;
  93                 return 1;
  94 
  95         case EVP_CTRL_GET_RC5_ROUNDS:
  96                 *(int *)ptr = data(c)->rounds;
  97                 return 1;
  98 
  99         case EVP_CTRL_SET_RC5_ROUNDS:
 100                 switch(arg)
 101                         {
 102                 case RC5_8_ROUNDS:
 103                 case RC5_12_ROUNDS:
 104                 case RC5_16_ROUNDS:
 105                         data(c)->rounds = arg;
 106                         return 1;
 107 
 108                 default:
 109                         EVPerr(EVP_F_RC5_CTRL, EVP_R_UNSUPORTED_NUMBER_OF_ROUNDS);
 110                         return 0;
 111                         }
 112 
 113         default:
 114                 return -1;
 115                 }
 116         }
 117 
 118 static int r_32_12_16_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
 119                                const unsigned char *iv, int enc)
 120         {
 121         RC5_32_set_key(&data(ctx)->ks,EVP_CIPHER_CTX_key_length(ctx),
 122                        key,data(ctx)->rounds);
 123         return 1;
 124         }
 125 
 126 #endif