1 /* crypto/des/cbc3_enc.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 "des_locl.h" 60 61 /* HAS BUGS! DON'T USE - this is only present for use in des.c */ 62 void DES_3cbc_encrypt(DES_cblock *input, DES_cblock *output, long length, 63 DES_key_schedule ks1, DES_key_schedule ks2, DES_cblock *iv1, 64 DES_cblock *iv2, int enc) 65 { 66 int off=((int)length-1)/8; 67 long l8=((length+7)/8)*8; 68 DES_cblock niv1,niv2; 69 70 if (enc == DES_ENCRYPT) 71 { 72 DES_cbc_encrypt((unsigned char*)input, 73 (unsigned char*)output,length,&ks1,iv1,enc); 74 if (length >= sizeof(DES_cblock)) 75 memcpy(niv1,output[off],sizeof(DES_cblock)); 76 DES_cbc_encrypt((unsigned char*)output, 77 (unsigned char*)output,l8,&ks2,iv1,!enc); 78 DES_cbc_encrypt((unsigned char*)output, 79 (unsigned char*)output,l8,&ks1,iv2,enc); 80 if (length >= sizeof(DES_cblock)) 81 memcpy(niv2,output[off],sizeof(DES_cblock)); 82 } 83 else 84 { 85 if (length >= sizeof(DES_cblock)) 86 memcpy(niv2,input[off],sizeof(DES_cblock)); 87 DES_cbc_encrypt((unsigned char*)input, 88 (unsigned char*)output,l8,&ks1,iv2,enc); 89 DES_cbc_encrypt((unsigned char*)output, 90 (unsigned char*)output,l8,&ks2,iv1,!enc); 91 if (length >= sizeof(DES_cblock)) 92 memcpy(niv1,output[off],sizeof(DES_cblock)); 93 DES_cbc_encrypt((unsigned char*)output, 94 (unsigned char*)output,length,&ks1,iv1,enc); 95 } 96 memcpy(*iv1,niv1,sizeof(DES_cblock)); 97 memcpy(*iv2,niv2,sizeof(DES_cblock)); 98 } 99 100
