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 #ifndef NO_RC2 60 61 #include <stdio.h> 62 #include "cryptlib.h" 63 #include <openssl/evp.h> 64 #include <openssl/objects.h> 65 #include "evp_locl.h" 66 67 static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, 68 const unsigned char *iv,int enc); 69 static int rc2_meth_to_magic(EVP_CIPHER_CTX *ctx); 70 static int rc2_magic_to_meth(int i); 71 static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type); 72 static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type); 73 static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr); 74 75 IMPLEMENT_BLOCK_CIPHER(rc2, rc2.ks, RC2, rc2, NID_rc2, 76 8, 77 EVP_RC2_KEY_SIZE, 8, 78 EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT, 79 rc2_init_key, NULL, 80 rc2_set_asn1_type_and_iv, rc2_get_asn1_type_and_iv, 81 rc2_ctrl) 82 83 #define RC2_40_MAGIC 0xa0 84 #define RC2_64_MAGIC 0x78 85 #define RC2_128_MAGIC 0x3a 86 87 static EVP_CIPHER r2_64_cbc_cipher= 88 { 89 NID_rc2_64_cbc, 90 8,8 /* 64 bit */,8, 91 EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT, 92 rc2_init_key, 93 rc2_cbc_cipher, 94 NULL, 95 sizeof(EVP_CIPHER_CTX)-sizeof((((EVP_CIPHER_CTX *)NULL)->c))+ 96 sizeof((((EVP_CIPHER_CTX *)NULL)->c.rc2)), 97 rc2_set_asn1_type_and_iv, 98 rc2_get_asn1_type_and_iv, 99 rc2_ctrl, 100 NULL 101 }; 102 103 static EVP_CIPHER r2_40_cbc_cipher= 104 { 105 NID_rc2_40_cbc, 106 8,5 /* 40 bit */,8, 107 EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT, 108 rc2_init_key, 109 rc2_cbc_cipher, 110 NULL, 111 sizeof(EVP_CIPHER_CTX)-sizeof((((EVP_CIPHER_CTX *)NULL)->c))+ 112 sizeof((((EVP_CIPHER_CTX *)NULL)->c.rc2)), 113 rc2_set_asn1_type_and_iv, 114 rc2_get_asn1_type_and_iv, 115 rc2_ctrl, 116 NULL 117 }; 118 119 EVP_CIPHER *EVP_rc2_64_cbc(void) 120 { 121 return(&r2_64_cbc_cipher); 122 } 123 124 EVP_CIPHER *EVP_rc2_40_cbc(void) 125 { 126 return(&r2_40_cbc_cipher); 127 } 128 129 static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, 130 const unsigned char *iv, int enc) 131 { 132 RC2_set_key(&(ctx->c.rc2.ks),EVP_CIPHER_CTX_key_length(ctx), 133 key,ctx->c.rc2.key_bits); 134 return 1; 135 } 136 137 static int rc2_meth_to_magic(EVP_CIPHER_CTX *e) 138 { 139 int i; 140 141 EVP_CIPHER_CTX_ctrl(e, EVP_CTRL_GET_RC2_KEY_BITS, 0, &i); 142 if (i == 128) return(RC2_128_MAGIC); 143 else if (i == 64) return(RC2_64_MAGIC); 144 else if (i == 40) return(RC2_40_MAGIC); 145 else return(0); 146 } 147 148 static int rc2_magic_to_meth(int i) 149 { 150 if (i == RC2_128_MAGIC) return 128; 151 else if (i == RC2_64_MAGIC) return 64; 152 else if (i == RC2_40_MAGIC) return 40; 153 else 154 { 155 EVPerr(EVP_F_RC2_MAGIC_TO_METH,EVP_R_UNSUPPORTED_KEY_SIZE); 156 return(0); 157 } 158 } 159 160 static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type) 161 { 162 long num=0; 163 int i=0,l; 164 int key_bits; 165 unsigned char iv[EVP_MAX_IV_LENGTH]; 166 167 if (type != NULL) 168 { 169 l=EVP_CIPHER_CTX_iv_length(c); 170 i=ASN1_TYPE_get_int_octetstring(type,&num,iv,l); 171 if (i != l) 172 return(-1); 173 key_bits =rc2_magic_to_meth((int)num); 174 if (!key_bits) 175 return(-1); 176 if(i > 0) EVP_CipherInit(c, NULL, NULL, iv, -1); 177 EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_RC2_KEY_BITS, key_bits, NULL); 178 EVP_CIPHER_CTX_set_key_length(c, key_bits / 8); 179 } 180 return(i); 181 } 182 183 static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type) 184 { 185 long num; 186 int i=0,j; 187 188 if (type != NULL) 189 { 190 num=rc2_meth_to_magic(c); 191 j=EVP_CIPHER_CTX_iv_length(c); 192 i=ASN1_TYPE_set_int_octetstring(type,num,c->oiv,j); 193 } 194 return(i); 195 } 196 197 static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr) 198 { 199 switch(type) { 200 201 case EVP_CTRL_INIT: 202 c->c.rc2.key_bits = EVP_CIPHER_CTX_key_length(c) * 8; 203 return 1; 204 205 case EVP_CTRL_GET_RC2_KEY_BITS: 206 *(int *)ptr = c->c.rc2.key_bits; 207 return 1; 208 209 210 case EVP_CTRL_SET_RC2_KEY_BITS: 211 if(arg > 0) { 212 c->c.rc2.key_bits = arg; 213 return 1; 214 } 215 return 0; 216 217 default: 218 return -1; 219 } 220 } 221 222 #endif 223