Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 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); |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 186 | if(i > 0) EVP_CipherInit_ex(c, NULL, NULL, NULL, iv, -1); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 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 | #ifdef PBE_PRF_TEST |
| 227 | case EVP_CTRL_PBE_PRF_NID: |
| 228 | *(int *)ptr = NID_hmacWithMD5; |
| 229 | return 1; |
| 230 | #endif |
| 231 | |
| 232 | default: |
| 233 | return -1; |
| 234 | } |
| 235 | } |
| 236 | |
| 237 | #endif |