1 /* $OpenBSD: e_rc2.c,v 1.10 2014/07/11 08:44:48 jsing Exp $ */ 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 61 #include <openssl/opensslconf.h> 62 63 #ifndef OPENSSL_NO_RC2 64 65 #include <openssl/err.h> 66 #include <openssl/evp.h> 67 #include <openssl/objects.h> 68 #include <openssl/rc2.h> 69 70 #include "evp_locl.h" 71 72 static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, 73 const unsigned char *iv, int enc); 74 static int rc2_meth_to_magic(EVP_CIPHER_CTX *ctx); 75 static int rc2_magic_to_meth(int i); 76 static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type); 77 static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type); 78 static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr); 79 80 typedef struct { 81 int key_bits; /* effective key bits */ 82 RC2_KEY ks; /* key schedule */ 83 } EVP_RC2_KEY; 84 85 #define data(ctx) ((EVP_RC2_KEY *)(ctx)->cipher_data) 86 87 IMPLEMENT_BLOCK_CIPHER(rc2, ks, RC2, EVP_RC2_KEY, NID_rc2, 88 8, 89 RC2_KEY_LENGTH, 8, 64, 90 EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT, 91 rc2_init_key, NULL, 92 rc2_set_asn1_type_and_iv, rc2_get_asn1_type_and_iv, 93 rc2_ctrl) 94 95 #define RC2_40_MAGIC 0xa0 96 #define RC2_64_MAGIC 0x78 97 #define RC2_128_MAGIC 0x3a 98 99 static const EVP_CIPHER r2_64_cbc_cipher = { 100 NID_rc2_64_cbc, 101 8, 8 /* 64 bit */, 8, 102 EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT, 103 rc2_init_key, 104 rc2_cbc_cipher, 105 NULL, 106 sizeof(EVP_RC2_KEY), 107 rc2_set_asn1_type_and_iv, 108 rc2_get_asn1_type_and_iv, 109 rc2_ctrl, 110 NULL 111 }; 112 113 static const EVP_CIPHER r2_40_cbc_cipher = { 114 NID_rc2_40_cbc, 115 8, 5 /* 40 bit */, 8, 116 EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT, 117 rc2_init_key, 118 rc2_cbc_cipher, 119 NULL, 120 sizeof(EVP_RC2_KEY), 121 rc2_set_asn1_type_and_iv, 122 rc2_get_asn1_type_and_iv, 123 rc2_ctrl, 124 NULL 125 }; 126 127 const EVP_CIPHER * 128 EVP_rc2_64_cbc(void) 129 { 130 return (&r2_64_cbc_cipher); 131 } 132 133 const EVP_CIPHER * 134 EVP_rc2_40_cbc(void) 135 { 136 return (&r2_40_cbc_cipher); 137 } 138 139 static int 140 rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, 141 const unsigned char *iv, int enc) 142 { 143 RC2_set_key(&data(ctx)->ks, EVP_CIPHER_CTX_key_length(ctx), 144 key, data(ctx)->key_bits); 145 return 1; 146 } 147 148 static int 149 rc2_meth_to_magic(EVP_CIPHER_CTX *e) 150 { 151 int i; 152 153 EVP_CIPHER_CTX_ctrl(e, EVP_CTRL_GET_RC2_KEY_BITS, 0, &i); 154 if (i == 128) 155 return (RC2_128_MAGIC); 156 else if (i == 64) 157 return (RC2_64_MAGIC); 158 else if (i == 40) 159 return (RC2_40_MAGIC); 160 else 161 return (0); 162 } 163 164 static int 165 rc2_magic_to_meth(int i) 166 { 167 if (i == RC2_128_MAGIC) 168 return 128; 169 else if (i == RC2_64_MAGIC) 170 return 64; 171 else if (i == RC2_40_MAGIC) 172 return 40; 173 else { 174 EVPerr(EVP_F_RC2_MAGIC_TO_METH, EVP_R_UNSUPPORTED_KEY_SIZE); 175 return (0); 176 } 177 } 178 179 static int 180 rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type) 181 { 182 long num = 0; 183 int i = 0; 184 int key_bits; 185 unsigned int l; 186 unsigned char iv[EVP_MAX_IV_LENGTH]; 187 188 if (type != NULL) { 189 l = EVP_CIPHER_CTX_iv_length(c); 190 if (l > sizeof(iv)) { 191 EVPerr(EVP_F_RC2_GET_ASN1_TYPE_AND_IV, 192 EVP_R_IV_TOO_LARGE); 193 return -1; 194 } 195 i = ASN1_TYPE_get_int_octetstring(type, &num, iv, l); 196 if (i != (int)l) 197 return (-1); 198 key_bits = rc2_magic_to_meth((int)num); 199 if (!key_bits) 200 return (-1); 201 if (i > 0 && !EVP_CipherInit_ex(c, NULL, NULL, NULL, iv, -1)) 202 return -1; 203 EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_RC2_KEY_BITS, 204 key_bits, NULL); 205 EVP_CIPHER_CTX_set_key_length(c, key_bits / 8); 206 } 207 return (i); 208 } 209 210 static int 211 rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type) 212 { 213 long num; 214 int i = 0, j; 215 216 if (type != NULL) { 217 num = rc2_meth_to_magic(c); 218 j = EVP_CIPHER_CTX_iv_length(c); 219 i = ASN1_TYPE_set_int_octetstring(type, num, c->oiv, j); 220 } 221 return (i); 222 } 223 224 static int 225 rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr) 226 { 227 switch (type) { 228 case EVP_CTRL_INIT: 229 data(c)->key_bits = EVP_CIPHER_CTX_key_length(c) * 8; 230 return 1; 231 232 case EVP_CTRL_GET_RC2_KEY_BITS: 233 *(int *)ptr = data(c)->key_bits; 234 return 1; 235 236 case EVP_CTRL_SET_RC2_KEY_BITS: 237 if (arg > 0) { 238 data(c)->key_bits = arg; 239 return 1; 240 } 241 return 0; 242 243 #ifdef PBE_PRF_TEST 244 case EVP_CTRL_PBE_PRF_NID: 245 *(int *)ptr = NID_hmacWithMD5; 246 return 1; 247 #endif 248 249 default: 250 return -1; 251 } 252 } 253 254 #endif 255