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      1 /* crypto/evp/e_rc5.c */
      2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com)
      3  * All rights reserved.
      4  *
      5  * This package is an SSL implementation written
      6  * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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
    127