1 /* crypto/evp/e_xcbc_d.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_DES 63 64 # include <openssl/evp.h> 65 # include <openssl/objects.h> 66 # include "evp_locl.h" 67 # include <openssl/des.h> 68 69 static int desx_cbc_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, 70 const unsigned char *iv, int enc); 71 static int desx_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 72 const unsigned char *in, size_t inl); 73 74 typedef struct { 75 DES_key_schedule ks; /* key schedule */ 76 DES_cblock inw; 77 DES_cblock outw; 78 } DESX_CBC_KEY; 79 80 # define data(ctx) ((DESX_CBC_KEY *)(ctx)->cipher_data) 81 82 static const EVP_CIPHER d_xcbc_cipher = { 83 NID_desx_cbc, 84 8, 24, 8, 85 EVP_CIPH_CBC_MODE, 86 desx_cbc_init_key, 87 desx_cbc_cipher, 88 NULL, 89 sizeof(DESX_CBC_KEY), 90 EVP_CIPHER_set_asn1_iv, 91 EVP_CIPHER_get_asn1_iv, 92 NULL, 93 NULL 94 }; 95 96 const EVP_CIPHER *EVP_desx_cbc(void) 97 { 98 return (&d_xcbc_cipher); 99 } 100 101 static int desx_cbc_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, 102 const unsigned char *iv, int enc) 103 { 104 DES_cblock *deskey = (DES_cblock *)key; 105 106 DES_set_key_unchecked(deskey, &data(ctx)->ks); 107 memcpy(&data(ctx)->inw[0], &key[8], 8); 108 memcpy(&data(ctx)->outw[0], &key[16], 8); 109 110 return 1; 111 } 112 113 static int desx_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 114 const unsigned char *in, size_t inl) 115 { 116 while (inl >= EVP_MAXCHUNK) { 117 DES_xcbc_encrypt(in, out, (long)EVP_MAXCHUNK, &data(ctx)->ks, 118 (DES_cblock *)&(ctx->iv[0]), 119 &data(ctx)->inw, &data(ctx)->outw, ctx->encrypt); 120 inl -= EVP_MAXCHUNK; 121 in += EVP_MAXCHUNK; 122 out += EVP_MAXCHUNK; 123 } 124 if (inl) 125 DES_xcbc_encrypt(in, out, (long)inl, &data(ctx)->ks, 126 (DES_cblock *)&(ctx->iv[0]), 127 &data(ctx)->inw, &data(ctx)->outw, ctx->encrypt); 128 return 1; 129 } 130 #endif 131