crypto/evp/e_rc5.c

   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 "internal/cryptlib.h"
  61
  62 #ifndef OPENSSL_NO_RC5
  63
  64 # include <openssl/evp.h>
  65 # include <internal/evp_int.h>
  66 # include <openssl/objects.h>
  67 # include "evp_locl.h"
  68 # include <openssl/rc5.h>
  69
  70 static int r_32_12_16_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  71                                const unsigned char *iv, int enc);
  72 static int rc5_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);
  73
  74 typedef struct {
  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, NULL, NULL, rc5_ctrl)
  85
  86 static int rc5_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
  87 {
  88     switch (type) {
  89     case EVP_CTRL_INIT:
  90         data(c)->rounds = RC5_12_ROUNDS;
  91         return 1;
  92
  93     case EVP_CTRL_GET_RC5_ROUNDS:
  94         *(int *)ptr = data(c)->rounds;
  95         return 1;
  96
  97     case EVP_CTRL_SET_RC5_ROUNDS:
  98         switch (arg) {
  99         case RC5_8_ROUNDS:
 100         case RC5_12_ROUNDS:
 101         case RC5_16_ROUNDS:
 102             data(c)->rounds = arg;
 103             return 1;
 104
 105         default:
 106             EVPerr(EVP_F_RC5_CTRL, EVP_R_UNSUPORTED_NUMBER_OF_ROUNDS);
 107             return 0;
 108         }
 109
 110     default:
 111         return -1;
 112     }
 113 }
 114
 115 static int r_32_12_16_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
 116                                const unsigned char *iv, int enc)
 117 {
 118     RC5_32_set_key(&data(ctx)->ks, EVP_CIPHER_CTX_key_length(ctx),
 119                    key, data(ctx)->rounds);
 120     return 1;
 121 }
 122
 123 #endif