1 /* crypto/evp/e_des.c */ 2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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 #ifndef OPENSSL_NO_DES 62 #include <openssl/evp.h> 63 #include <openssl/objects.h> 64 #include "evp_locl.h" 65 #include <openssl/des.h> 66 #include <openssl/rand.h> 67 68 static int des_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, 69 const unsigned char *iv, int enc); 70 static int des_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr); 71 72 /* Because of various casts and different names can't use IMPLEMENT_BLOCK_CIPHER */ 73 74 static int des_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 75 const unsigned char *in, size_t inl) 76 { 77 BLOCK_CIPHER_ecb_loop() 78 DES_ecb_encrypt((DES_cblock *)(in + i), (DES_cblock *)(out + i), ctx->cipher_data, ctx->encrypt); 79 return 1; 80 } 81 82 static int des_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 83 const unsigned char *in, size_t inl) 84 { 85 while(inl>=EVP_MAXCHUNK) 86 { 87 DES_ofb64_encrypt(in, out, (long)EVP_MAXCHUNK, ctx->cipher_data, 88 (DES_cblock *)ctx->iv, &ctx->num); 89 inl-=EVP_MAXCHUNK; 90 in +=EVP_MAXCHUNK; 91 out+=EVP_MAXCHUNK; 92 } 93 if (inl) 94 DES_ofb64_encrypt(in, out, (long)inl, ctx->cipher_data, 95 (DES_cblock *)ctx->iv, &ctx->num); 96 return 1; 97 } 98 99 static int des_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 100 const unsigned char *in, size_t inl) 101 { 102 while(inl>=EVP_MAXCHUNK) 103 { 104 DES_ncbc_encrypt(in, out, (long)EVP_MAXCHUNK, ctx->cipher_data, 105 (DES_cblock *)ctx->iv, ctx->encrypt); 106 inl-=EVP_MAXCHUNK; 107 in +=EVP_MAXCHUNK; 108 out+=EVP_MAXCHUNK; 109 } 110 if (inl) 111 DES_ncbc_encrypt(in, out, (long)inl, ctx->cipher_data, 112 (DES_cblock *)ctx->iv, ctx->encrypt); 113 return 1; 114 } 115 116 static int des_cfb64_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 117 const unsigned char *in, size_t inl) 118 { 119 while(inl>=EVP_MAXCHUNK) 120 { 121 DES_cfb64_encrypt(in,out, (long)EVP_MAXCHUNK, ctx->cipher_data, 122 (DES_cblock *)ctx->iv, &ctx->num, ctx->encrypt); 123 inl-=EVP_MAXCHUNK; 124 in +=EVP_MAXCHUNK; 125 out+=EVP_MAXCHUNK; 126 } 127 if (inl) 128 DES_cfb64_encrypt(in, out, (long)inl, ctx->cipher_data, 129 (DES_cblock *)ctx->iv, &ctx->num, ctx->encrypt); 130 return 1; 131 } 132 133 /* Although we have a CFB-r implementation for DES, it doesn't pack the right 134 way, so wrap it here */ 135 static int des_cfb1_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 136 const unsigned char *in, size_t inl) 137 { 138 size_t n,chunk=EVP_MAXCHUNK/8; 139 unsigned char c[1],d[1]; 140 141 if (inl<chunk) chunk=inl; 142 143 while (inl && inl>=chunk) 144 { 145 for(n=0 ; n < chunk*8; ++n) 146 { 147 c[0]=(in[n/8]&(1 << (7-n%8))) ? 0x80 : 0; 148 DES_cfb_encrypt(c,d,1,1,ctx->cipher_data,(DES_cblock *)ctx->iv, 149 ctx->encrypt); 150 out[n/8]=(out[n/8]&~(0x80 >> (unsigned int)(n%8))) | 151 ((d[0]&0x80) >> (unsigned int)(n%8)); 152 } 153 inl-=chunk; 154 in +=chunk; 155 out+=chunk; 156 if (inl<chunk) chunk=inl; 157 } 158 159 return 1; 160 } 161 162 static int des_cfb8_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 163 const unsigned char *in, size_t inl) 164 { 165 while (inl>=EVP_MAXCHUNK) 166 { 167 DES_cfb_encrypt(in,out,8,(long)EVP_MAXCHUNK,ctx->cipher_data, 168 (DES_cblock *)ctx->iv,ctx->encrypt); 169 inl-=EVP_MAXCHUNK; 170 in +=EVP_MAXCHUNK; 171 out+=EVP_MAXCHUNK; 172 } 173 if (inl) 174 DES_cfb_encrypt(in,out,8,(long)inl,ctx->cipher_data, 175 (DES_cblock *)ctx->iv,ctx->encrypt); 176 return 1; 177 } 178 179 BLOCK_CIPHER_defs(des, DES_key_schedule, NID_des, 8, 8, 8, 64, 180 EVP_CIPH_RAND_KEY, des_init_key, NULL, 181 EVP_CIPHER_set_asn1_iv, 182 EVP_CIPHER_get_asn1_iv, 183 des_ctrl) 184 185 BLOCK_CIPHER_def_cfb(des,DES_key_schedule,NID_des,8,8,1, 186 EVP_CIPH_RAND_KEY, des_init_key,NULL, 187 EVP_CIPHER_set_asn1_iv, 188 EVP_CIPHER_get_asn1_iv,des_ctrl) 189 190 BLOCK_CIPHER_def_cfb(des,DES_key_schedule,NID_des,8,8,8, 191 EVP_CIPH_RAND_KEY,des_init_key,NULL, 192 EVP_CIPHER_set_asn1_iv, 193 EVP_CIPHER_get_asn1_iv,des_ctrl) 194 195 static int des_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, 196 const unsigned char *iv, int enc) 197 { 198 DES_cblock *deskey = (DES_cblock *)key; 199 #ifdef EVP_CHECK_DES_KEY 200 if(DES_set_key_checked(deskey,ctx->cipher_data) != 0) 201 return 0; 202 #else 203 DES_set_key_unchecked(deskey,ctx->cipher_data); 204 #endif 205 return 1; 206 } 207 208 static int des_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr) 209 { 210 211 switch(type) 212 { 213 case EVP_CTRL_RAND_KEY: 214 if (RAND_bytes(ptr, 8) <= 0) 215 return 0; 216 DES_set_odd_parity((DES_cblock *)ptr); 217 return 1; 218 219 default: 220 return -1; 221 } 222 } 223 224 #endif 225
