1 /* $OpenBSD: e_idea.c,v 1.17 2022/09/15 07:04:19 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 <limits.h> 60 #include <stdio.h> 61 #include <string.h> 62 63 #include <openssl/opensslconf.h> 64 65 #ifndef OPENSSL_NO_IDEA 66 67 #include <openssl/evp.h> 68 #include <openssl/idea.h> 69 #include <openssl/objects.h> 70 71 #include "evp_locl.h" 72 73 /* NB idea_ecb_encrypt doesn't take an 'encrypt' argument so we treat it as a special 74 * case 75 */ 76 77 static int 78 idea_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, 79 const unsigned char *iv, int enc) 80 { 81 if (!enc) { 82 if (EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_OFB_MODE) 83 enc = 1; 84 else if (EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_CFB_MODE) 85 enc = 1; 86 } 87 if (enc) 88 idea_set_encrypt_key(key, ctx->cipher_data); 89 else { 90 IDEA_KEY_SCHEDULE tmp; 91 92 idea_set_encrypt_key(key, &tmp); 93 idea_set_decrypt_key(&tmp, ctx->cipher_data); 94 explicit_bzero((unsigned char *)&tmp, 95 sizeof(IDEA_KEY_SCHEDULE)); 96 } 97 return 1; 98 } 99 100 static int 101 idea_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 102 const unsigned char *in, size_t inl) 103 { 104 size_t i, bl; 105 106 bl = ctx->cipher->block_size; 107 108 if (inl < bl) 109 return 1; 110 111 inl -= bl; 112 113 for (i = 0; i <= inl; i += bl) 114 idea_ecb_encrypt(in + i, out + i, ctx->cipher_data); 115 116 return 1; 117 } 118 119 typedef struct { 120 IDEA_KEY_SCHEDULE ks; 121 } EVP_IDEA_KEY; 122 123 static int 124 idea_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in, size_t inl) 125 { 126 size_t chunk = LONG_MAX & ~0xff; 127 128 while (inl >= chunk) { 129 idea_cbc_encrypt(in, out, (long)chunk, &((EVP_IDEA_KEY *)ctx->cipher_data)->ks, ctx->iv, ctx->encrypt); 130 inl -= chunk; 131 in += chunk; 132 out += chunk; 133 } 134 135 if (inl) 136 idea_cbc_encrypt(in, out, (long)inl, &((EVP_IDEA_KEY *)ctx->cipher_data)->ks, ctx->iv, ctx->encrypt); 137 138 return 1; 139 } 140 141 static int 142 idea_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in, size_t inl) 143 { 144 size_t chunk = LONG_MAX & ~0xff; 145 146 while (inl >= chunk) { 147 idea_ofb64_encrypt(in, out, (long)chunk, &((EVP_IDEA_KEY *)ctx->cipher_data)->ks, ctx->iv, &ctx->num); 148 inl -= chunk; 149 in += chunk; 150 out += chunk; 151 } 152 153 if (inl) 154 idea_ofb64_encrypt(in, out, (long)inl, &((EVP_IDEA_KEY *)ctx->cipher_data)->ks, ctx->iv, &ctx->num); 155 156 return 1; 157 } 158 159 static int 160 idea_cfb64_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in, size_t inl) 161 { 162 size_t chunk = LONG_MAX & ~0xff; 163 164 if (inl < chunk) 165 chunk = inl; 166 167 while (inl && inl >= chunk) { 168 idea_cfb64_encrypt(in, out, (long)chunk, &((EVP_IDEA_KEY *)ctx->cipher_data)->ks, ctx->iv, &ctx->num, ctx->encrypt); 169 inl -= chunk; 170 in += chunk; 171 out += chunk; 172 if (inl < chunk) 173 chunk = inl; 174 } 175 176 return 1; 177 } 178 179 static const EVP_CIPHER idea_cbc = { 180 .nid = NID_idea_cbc, 181 .block_size = 8, 182 .key_len = 16, 183 .iv_len = 8, 184 .flags = 0 | EVP_CIPH_CBC_MODE, 185 .init = idea_init_key, 186 .do_cipher = idea_cbc_cipher, 187 .cleanup = NULL, 188 .ctx_size = sizeof(IDEA_KEY_SCHEDULE), 189 .set_asn1_parameters = EVP_CIPHER_set_asn1_iv, 190 .get_asn1_parameters = EVP_CIPHER_get_asn1_iv, 191 .ctrl = NULL, 192 .app_data = NULL, 193 }; 194 195 const EVP_CIPHER * 196 EVP_idea_cbc(void) 197 { 198 return &idea_cbc; 199 } 200 201 static const EVP_CIPHER idea_cfb64 = { 202 .nid = NID_idea_cfb64, 203 .block_size = 1, 204 .key_len = 16, 205 .iv_len = 8, 206 .flags = 0 | EVP_CIPH_CFB_MODE, 207 .init = idea_init_key, 208 .do_cipher = idea_cfb64_cipher, 209 .cleanup = NULL, 210 .ctx_size = sizeof(IDEA_KEY_SCHEDULE), 211 .set_asn1_parameters = EVP_CIPHER_set_asn1_iv, 212 .get_asn1_parameters = EVP_CIPHER_get_asn1_iv, 213 .ctrl = NULL, 214 .app_data = NULL, 215 }; 216 217 const EVP_CIPHER * 218 EVP_idea_cfb64(void) 219 { 220 return &idea_cfb64; 221 } 222 223 static const EVP_CIPHER idea_ofb = { 224 .nid = NID_idea_ofb64, 225 .block_size = 1, 226 .key_len = 16, 227 .iv_len = 8, 228 .flags = 0 | EVP_CIPH_OFB_MODE, 229 .init = idea_init_key, 230 .do_cipher = idea_ofb_cipher, 231 .cleanup = NULL, 232 .ctx_size = sizeof(IDEA_KEY_SCHEDULE), 233 .set_asn1_parameters = EVP_CIPHER_set_asn1_iv, 234 .get_asn1_parameters = EVP_CIPHER_get_asn1_iv, 235 .ctrl = NULL, 236 .app_data = NULL, 237 }; 238 239 const EVP_CIPHER * 240 EVP_idea_ofb(void) 241 { 242 return &idea_ofb; 243 } 244 245 static const EVP_CIPHER idea_ecb = { 246 .nid = NID_idea_ecb, 247 .block_size = 8, 248 .key_len = 16, 249 .iv_len = 0, 250 .flags = 0 | EVP_CIPH_ECB_MODE, 251 .init = idea_init_key, 252 .do_cipher = idea_ecb_cipher, 253 .cleanup = NULL, 254 .ctx_size = sizeof(IDEA_KEY_SCHEDULE), 255 .set_asn1_parameters = EVP_CIPHER_set_asn1_iv, 256 .get_asn1_parameters = EVP_CIPHER_get_asn1_iv, 257 .ctrl = NULL, 258 .app_data = NULL, 259 }; 260 261 const EVP_CIPHER * 262 EVP_idea_ecb(void) 263 { 264 return &idea_ecb; 265 } 266 #endif 267