1 /* crypto/evp/e_rc2.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_RC2 63 64 # include <openssl/evp.h> 65 # include <openssl/objects.h> 66 # include "evp_locl.h" 67 # include <openssl/rc2.h> 68 69 static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, 70 const unsigned char *iv, int enc); 71 static int rc2_meth_to_magic(EVP_CIPHER_CTX *ctx); 72 static int rc2_magic_to_meth(int i); 73 static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type); 74 static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type); 75 static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr); 76 77 typedef struct { 78 int key_bits; /* effective key bits */ 79 RC2_KEY ks; /* key schedule */ 80 } EVP_RC2_KEY; 81 82 # define data(ctx) ((EVP_RC2_KEY *)(ctx)->cipher_data) 83 84 IMPLEMENT_BLOCK_CIPHER(rc2, ks, RC2, EVP_RC2_KEY, NID_rc2, 85 8, 86 RC2_KEY_LENGTH, 8, 64, 87 EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT, 88 rc2_init_key, NULL, 89 rc2_set_asn1_type_and_iv, rc2_get_asn1_type_and_iv, 90 rc2_ctrl) 91 # define RC2_40_MAGIC 0xa0 92 # define RC2_64_MAGIC 0x78 93 # define RC2_128_MAGIC 0x3a 94 static const EVP_CIPHER r2_64_cbc_cipher = { 95 NID_rc2_64_cbc, 96 8, 8 /* 64 bit */ , 8, 97 EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT, 98 rc2_init_key, 99 rc2_cbc_cipher, 100 NULL, 101 sizeof(EVP_RC2_KEY), 102 rc2_set_asn1_type_and_iv, 103 rc2_get_asn1_type_and_iv, 104 rc2_ctrl, 105 NULL 106 }; 107 108 static const EVP_CIPHER r2_40_cbc_cipher = { 109 NID_rc2_40_cbc, 110 8, 5 /* 40 bit */ , 8, 111 EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT, 112 rc2_init_key, 113 rc2_cbc_cipher, 114 NULL, 115 sizeof(EVP_RC2_KEY), 116 rc2_set_asn1_type_and_iv, 117 rc2_get_asn1_type_and_iv, 118 rc2_ctrl, 119 NULL 120 }; 121 122 const EVP_CIPHER *EVP_rc2_64_cbc(void) 123 { 124 return (&r2_64_cbc_cipher); 125 } 126 127 const EVP_CIPHER *EVP_rc2_40_cbc(void) 128 { 129 return (&r2_40_cbc_cipher); 130 } 131 132 static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, 133 const unsigned char *iv, int enc) 134 { 135 RC2_set_key(&data(ctx)->ks, EVP_CIPHER_CTX_key_length(ctx), 136 key, data(ctx)->key_bits); 137 return 1; 138 } 139 140 static int rc2_meth_to_magic(EVP_CIPHER_CTX *e) 141 { 142 int i; 143 144 EVP_CIPHER_CTX_ctrl(e, EVP_CTRL_GET_RC2_KEY_BITS, 0, &i); 145 if (i == 128) 146 return (RC2_128_MAGIC); 147 else if (i == 64) 148 return (RC2_64_MAGIC); 149 else if (i == 40) 150 return (RC2_40_MAGIC); 151 else 152 return (0); 153 } 154 155 static int rc2_magic_to_meth(int i) 156 { 157 if (i == RC2_128_MAGIC) 158 return 128; 159 else if (i == RC2_64_MAGIC) 160 return 64; 161 else if (i == RC2_40_MAGIC) 162 return 40; 163 else { 164 EVPerr(EVP_F_RC2_MAGIC_TO_METH, EVP_R_UNSUPPORTED_KEY_SIZE); 165 return (0); 166 } 167 } 168 169 static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type) 170 { 171 long num = 0; 172 int i = 0; 173 int key_bits; 174 unsigned int l; 175 unsigned char iv[EVP_MAX_IV_LENGTH]; 176 177 if (type != NULL) { 178 l = EVP_CIPHER_CTX_iv_length(c); 179 OPENSSL_assert(l <= sizeof(iv)); 180 i = ASN1_TYPE_get_int_octetstring(type, &num, iv, l); 181 if (i != (int)l) 182 return (-1); 183 key_bits = rc2_magic_to_meth((int)num); 184 if (!key_bits) 185 return (-1); 186 if (i > 0 && !EVP_CipherInit_ex(c, NULL, NULL, NULL, iv, -1)) 187 return -1; 188 EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_RC2_KEY_BITS, key_bits, NULL); 189 EVP_CIPHER_CTX_set_key_length(c, key_bits / 8); 190 } 191 return (i); 192 } 193 194 static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type) 195 { 196 long num; 197 int i = 0, j; 198 199 if (type != NULL) { 200 num = rc2_meth_to_magic(c); 201 j = EVP_CIPHER_CTX_iv_length(c); 202 i = ASN1_TYPE_set_int_octetstring(type, num, c->oiv, j); 203 } 204 return (i); 205 } 206 207 static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr) 208 { 209 switch (type) { 210 case EVP_CTRL_INIT: 211 data(c)->key_bits = EVP_CIPHER_CTX_key_length(c) * 8; 212 return 1; 213 214 case EVP_CTRL_GET_RC2_KEY_BITS: 215 *(int *)ptr = data(c)->key_bits; 216 return 1; 217 218 case EVP_CTRL_SET_RC2_KEY_BITS: 219 if (arg > 0) { 220 data(c)->key_bits = arg; 221 return 1; 222 } 223 return 0; 224 # ifdef PBE_PRF_TEST 225 case EVP_CTRL_PBE_PRF_NID: 226 *(int *)ptr = NID_hmacWithMD5; 227 return 1; 228 # endif 229 230 default: 231 return -1; 232 } 233 } 234 235 #endif 236