1 /* crypto/des/cbc3_enc.c */ 2 /* Copyright (C) 1995-1997 Eric Young (eay@mincom.oz.au) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@mincom.oz.au). 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@mincom.oz.au). 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@mincom.oz.au)" 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@mincom.oz.au)" 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 */ 62 void des_3cbc_encrypt(input, output, length, ks1, ks2, iv1, iv2, encrypt) 63 des_cblock (*input); 64 des_cblock (*output); 65 long length; 66 des_key_schedule ks1; 67 des_key_schedule ks2; 68 des_cblock (*iv1); 69 des_cblock (*iv2); 70 int encrypt; 71 { 72 int off=((int)length-1)/8; 73 long l8=((length+7)/8)*8; 74 des_cblock niv1,niv2; 75 76 if (encrypt == DES_ENCRYPT) 77 { 78 des_cbc_encrypt(input,output,length,ks1,iv1,encrypt); 79 if (length >= sizeof(des_cblock)) 80 memcpy(niv1,output[off],sizeof(des_cblock)); 81 des_cbc_encrypt(output,output,l8,ks2,iv1,!encrypt); 82 des_cbc_encrypt(output,output,l8,ks1,iv2, encrypt); 83 if (length >= sizeof(des_cblock)) 84 memcpy(niv2,output[off],sizeof(des_cblock)); 85 } 86 else 87 { 88 if (length >= sizeof(des_cblock)) 89 memcpy(niv2,input[off],sizeof(des_cblock)); 90 des_cbc_encrypt(input,output,l8,ks1,iv2,encrypt); 91 des_cbc_encrypt(output,output,l8,ks2,iv1,!encrypt); 92 if (length >= sizeof(des_cblock)) 93 memcpy(niv1,output[off],sizeof(des_cblock)); 94 des_cbc_encrypt(output,output,length,ks1,iv1, encrypt); 95 } 96 memcpy(*iv1,niv1,sizeof(des_cblock)); 97 memcpy(*iv2,niv2,sizeof(des_cblock)); 98 } 99 100