1 /* $OpenBSD: e_des.c,v 1.14 2015/10/12 06:05:52 guenther 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_DES 64 65 #include <openssl/evp.h> 66 #include <openssl/des.h> 67 #include <openssl/objects.h> 68 69 #include "evp_locl.h" 70 71 static int des_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, 72 const unsigned char *iv, int enc); 73 static int des_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr); 74 75 /* Because of various casts and different names can't use IMPLEMENT_BLOCK_CIPHER */ 76 77 static int 78 des_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 79 const unsigned char *in, size_t inl) 80 { 81 BLOCK_CIPHER_ecb_loop() 82 DES_ecb_encrypt((DES_cblock *)(in + i), (DES_cblock *)(out + i), 83 ctx->cipher_data, ctx->encrypt); 84 return 1; 85 } 86 87 static int 88 des_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 89 const unsigned char *in, size_t inl) 90 { 91 while (inl >= EVP_MAXCHUNK) { 92 DES_ofb64_encrypt(in, out, (long)EVP_MAXCHUNK, ctx->cipher_data, 93 (DES_cblock *)ctx->iv, &ctx->num); 94 inl -= EVP_MAXCHUNK; 95 in += EVP_MAXCHUNK; 96 out += EVP_MAXCHUNK; 97 } 98 if (inl) 99 DES_ofb64_encrypt(in, out, (long)inl, ctx->cipher_data, 100 (DES_cblock *)ctx->iv, &ctx->num); 101 return 1; 102 } 103 104 static int 105 des_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 106 const unsigned char *in, size_t inl) 107 { 108 while (inl >= EVP_MAXCHUNK) { 109 DES_ncbc_encrypt(in, out, (long)EVP_MAXCHUNK, ctx->cipher_data, 110 (DES_cblock *)ctx->iv, ctx->encrypt); 111 inl -= EVP_MAXCHUNK; 112 in += EVP_MAXCHUNK; 113 out += EVP_MAXCHUNK; 114 } 115 if (inl) 116 DES_ncbc_encrypt(in, out, (long)inl, ctx->cipher_data, 117 (DES_cblock *)ctx->iv, ctx->encrypt); 118 return 1; 119 } 120 121 static int 122 des_cfb64_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 123 const unsigned char *in, size_t inl) 124 { 125 while (inl >= EVP_MAXCHUNK) { 126 DES_cfb64_encrypt(in, out, (long)EVP_MAXCHUNK, ctx->cipher_data, 127 (DES_cblock *)ctx->iv, &ctx->num, ctx->encrypt); 128 inl -= EVP_MAXCHUNK; 129 in += EVP_MAXCHUNK; 130 out += EVP_MAXCHUNK; 131 } 132 if (inl) 133 DES_cfb64_encrypt(in, out, (long)inl, ctx->cipher_data, 134 (DES_cblock *)ctx->iv, &ctx->num, ctx->encrypt); 135 return 1; 136 } 137 138 /* Although we have a CFB-r implementation for DES, it doesn't pack the right 139 way, so wrap it here */ 140 static int 141 des_cfb1_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 142 const unsigned char *in, size_t inl) 143 { 144 size_t n, chunk = EVP_MAXCHUNK/8; 145 unsigned char c[1], d[1]; 146 147 if (inl < chunk) 148 chunk = inl; 149 150 while (inl && inl >= chunk) { 151 for (n = 0; n < chunk*8; ++n) { 152 c[0] = (in[n / 8] & (1 << (7 - n % 8))) ? 0x80 : 0; 153 DES_cfb_encrypt(c, d, 1, 1, ctx->cipher_data, 154 (DES_cblock *)ctx->iv, ctx->encrypt); 155 out[n / 8] = (out[n / 8] & 156 ~(0x80 >> (unsigned int)(n % 8))) | 157 ((d[0] & 0x80) >> (unsigned int)(n % 8)); 158 } 159 inl -= chunk; 160 in += chunk; 161 out += chunk; 162 if (inl < chunk) 163 chunk = inl; 164 } 165 166 return 1; 167 } 168 169 static int 170 des_cfb8_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 171 const unsigned char *in, size_t inl) 172 { 173 while (inl >= EVP_MAXCHUNK) { 174 DES_cfb_encrypt(in, out, 8, (long)EVP_MAXCHUNK, 175 ctx->cipher_data, (DES_cblock *)ctx->iv, ctx->encrypt); 176 inl -= EVP_MAXCHUNK; 177 in += EVP_MAXCHUNK; 178 out += EVP_MAXCHUNK; 179 } 180 if (inl) 181 DES_cfb_encrypt(in, out, 8, (long)inl, ctx->cipher_data, 182 (DES_cblock *)ctx->iv, ctx->encrypt); 183 return 1; 184 } 185 186 BLOCK_CIPHER_defs(des, DES_key_schedule, NID_des, 8, 8, 8, 64, 187 EVP_CIPH_RAND_KEY, des_init_key, NULL, 188 EVP_CIPHER_set_asn1_iv, 189 EVP_CIPHER_get_asn1_iv, 190 des_ctrl) 191 192 BLOCK_CIPHER_def_cfb(des, DES_key_schedule, NID_des, 8, 8, 1, 193 EVP_CIPH_RAND_KEY, des_init_key, NULL, 194 EVP_CIPHER_set_asn1_iv, 195 EVP_CIPHER_get_asn1_iv, des_ctrl) 196 197 BLOCK_CIPHER_def_cfb(des, DES_key_schedule, NID_des, 8, 8, 8, 198 EVP_CIPH_RAND_KEY, des_init_key, NULL, 199 EVP_CIPHER_set_asn1_iv, 200 EVP_CIPHER_get_asn1_iv, des_ctrl) 201 202 static int 203 des_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, 204 const unsigned char *iv, int enc) 205 { 206 DES_cblock *deskey = (DES_cblock *)key; 207 208 DES_set_key_unchecked(deskey, ctx->cipher_data); 209 return 1; 210 } 211 212 static int 213 des_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr) 214 { 215 switch (type) { 216 case EVP_CTRL_RAND_KEY: 217 if (DES_random_key((DES_cblock *)ptr) == 0) 218 return 0; 219 return 1; 220 221 default: 222 return -1; 223 } 224 } 225 226 #endif 227