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 127