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 { 79 int key_bits; /* effective key bits */ 80 RC2_KEY ks; /* key schedule */ 81 } EVP_RC2_KEY; 82 83 #define data(ctx) ((EVP_RC2_KEY *)(ctx)->cipher_data) 84 85 IMPLEMENT_BLOCK_CIPHER(rc2, ks, RC2, EVP_RC2_KEY, NID_rc2, 86 8, 87 RC2_KEY_LENGTH, 8, 64, 88 EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT, 89 rc2_init_key, NULL, 90 rc2_set_asn1_type_and_iv, rc2_get_asn1_type_and_iv, 91 rc2_ctrl) 92 93 #define RC2_40_MAGIC 0xa0 94 #define RC2_64_MAGIC 0x78 95 #define RC2_128_MAGIC 0x3a 96 97 static const EVP_CIPHER r2_64_cbc_cipher= 98 { 99 NID_rc2_64_cbc, 100 8,8 /* 64 bit */,8, 101 EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT, 102 rc2_init_key, 103 rc2_cbc_cipher, 104 NULL, 105 sizeof(EVP_RC2_KEY), 106 rc2_set_asn1_type_and_iv, 107 rc2_get_asn1_type_and_iv, 108 rc2_ctrl, 109 NULL 110 }; 111 112 static const EVP_CIPHER r2_40_cbc_cipher= 113 { 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 *EVP_rc2_64_cbc(void) 128 { 129 return(&r2_64_cbc_cipher); 130 } 131 132 const EVP_CIPHER *EVP_rc2_40_cbc(void) 133 { 134 return(&r2_40_cbc_cipher); 135 } 136 137 static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, 138 const unsigned char *iv, int enc) 139 { 140 RC2_set_key(&data(ctx)->ks,EVP_CIPHER_CTX_key_length(ctx), 141 key,data(ctx)->key_bits); 142 return 1; 143 } 144 145 static int rc2_meth_to_magic(EVP_CIPHER_CTX *e) 146 { 147 int i; 148 149 EVP_CIPHER_CTX_ctrl(e, EVP_CTRL_GET_RC2_KEY_BITS, 0, &i); 150 if (i == 128) return(RC2_128_MAGIC); 151 else if (i == 64) return(RC2_64_MAGIC); 152 else if (i == 40) return(RC2_40_MAGIC); 153 else return(0); 154 } 155 156 static int rc2_magic_to_meth(int i) 157 { 158 if (i == RC2_128_MAGIC) return 128; 159 else if (i == RC2_64_MAGIC) return 64; 160 else if (i == RC2_40_MAGIC) return 40; 161 else 162 { 163 EVPerr(EVP_F_RC2_MAGIC_TO_METH,EVP_R_UNSUPPORTED_KEY_SIZE); 164 return(0); 165 } 166 } 167 168 static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type) 169 { 170 long num=0; 171 int i=0; 172 int key_bits; 173 unsigned int l; 174 unsigned char iv[EVP_MAX_IV_LENGTH]; 175 176 if (type != NULL) 177 { 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 EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_RC2_KEY_BITS, key_bits, NULL); 188 EVP_CIPHER_CTX_set_key_length(c, key_bits / 8); 189 } 190 return(i); 191 } 192 193 static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type) 194 { 195 long num; 196 int i=0,j; 197 198 if (type != NULL) 199 { 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 { 211 case EVP_CTRL_INIT: 212 data(c)->key_bits = EVP_CIPHER_CTX_key_length(c) * 8; 213 return 1; 214 215 case EVP_CTRL_GET_RC2_KEY_BITS: 216 *(int *)ptr = data(c)->key_bits; 217 return 1; 218 219 case EVP_CTRL_SET_RC2_KEY_BITS: 220 if(arg > 0) 221 { 222 data(c)->key_bits = arg; 223 return 1; 224 } 225 return 0; 226 227 default: 228 return -1; 229 } 230 } 231 232 #endif 233