1 /* crypto/des/cbc_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 void des_cbc_encrypt(input, output, length, schedule, ivec, encrypt) 62 des_cblock (*input); 63 des_cblock (*output); 64 long length; 65 des_key_schedule schedule; 66 des_cblock (*ivec); 67 int encrypt; 68 { 69 register DES_LONG tin0,tin1; 70 register DES_LONG tout0,tout1,xor0,xor1; 71 register unsigned char *in,*out; 72 register long l=length; 73 DES_LONG tin[2]; 74 unsigned char *iv; 75 76 in=(unsigned char *)input; 77 out=(unsigned char *)output; 78 iv=(unsigned char *)ivec; 79 80 if (encrypt) 81 { 82 c2l(iv,tout0); 83 c2l(iv,tout1); 84 for (l-=8; l>=0; l-=8) 85 { 86 c2l(in,tin0); 87 c2l(in,tin1); 88 tin0^=tout0; tin[0]=tin0; 89 tin1^=tout1; tin[1]=tin1; 90 des_encrypt((DES_LONG *)tin,schedule,DES_ENCRYPT); 91 tout0=tin[0]; l2c(tout0,out); 92 tout1=tin[1]; l2c(tout1,out); 93 } 94 if (l != -8) 95 { 96 c2ln(in,tin0,tin1,l+8); 97 tin0^=tout0; tin[0]=tin0; 98 tin1^=tout1; tin[1]=tin1; 99 des_encrypt((DES_LONG *)tin,schedule,DES_ENCRYPT); 100 tout0=tin[0]; l2c(tout0,out); 101 tout1=tin[1]; l2c(tout1,out); 102 } 103 } 104 else 105 { 106 c2l(iv,xor0); 107 c2l(iv,xor1); 108 for (l-=8; l>=0; l-=8) 109 { 110 c2l(in,tin0); tin[0]=tin0; 111 c2l(in,tin1); tin[1]=tin1; 112 des_encrypt((DES_LONG *)tin,schedule,DES_DECRYPT); 113 tout0=tin[0]^xor0; 114 tout1=tin[1]^xor1; 115 l2c(tout0,out); 116 l2c(tout1,out); 117 xor0=tin0; 118 xor1=tin1; 119 } 120 if (l != -8) 121 { 122 c2l(in,tin0); tin[0]=tin0; 123 c2l(in,tin1); tin[1]=tin1; 124 des_encrypt((DES_LONG *)tin,schedule,DES_DECRYPT); 125 tout0=tin[0]^xor0; 126 tout1=tin[1]^xor1; 127 l2cn(tout0,tout1,out,l+8); 128 /* xor0=tin0; 129 xor1=tin1; */ 130 } 131 } 132 tin0=tin1=tout0=tout1=xor0=xor1=0; 133 tin[0]=tin[1]=0; 134 } 135 136