1 /* crypto/des/ncbc_enc.c */ 2 /* 3 * #included by: 4 * cbc_enc.c (DES_cbc_encrypt) 5 * des_enc.c (DES_ncbc_encrypt) 6 */ 7 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 8 * All rights reserved. 9 * 10 * This package is an SSL implementation written 11 * by Eric Young (eay (at) cryptsoft.com). 12 * The implementation was written so as to conform with Netscapes SSL. 13 * 14 * This library is free for commercial and non-commercial use as long as 15 * the following conditions are aheared to. The following conditions 16 * apply to all code found in this distribution, be it the RC4, RSA, 17 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 18 * included with this distribution is covered by the same copyright terms 19 * except that the holder is Tim Hudson (tjh (at) cryptsoft.com). 20 * 21 * Copyright remains Eric Young's, and as such any Copyright notices in 22 * the code are not to be removed. 23 * If this package is used in a product, Eric Young should be given attribution 24 * as the author of the parts of the library used. 25 * This can be in the form of a textual message at program startup or 26 * in documentation (online or textual) provided with the package. 27 * 28 * Redistribution and use in source and binary forms, with or without 29 * modification, are permitted provided that the following conditions 30 * are met: 31 * 1. Redistributions of source code must retain the copyright 32 * notice, this list of conditions and the following disclaimer. 33 * 2. Redistributions in binary form must reproduce the above copyright 34 * notice, this list of conditions and the following disclaimer in the 35 * documentation and/or other materials provided with the distribution. 36 * 3. All advertising materials mentioning features or use of this software 37 * must display the following acknowledgement: 38 * "This product includes cryptographic software written by 39 * Eric Young (eay (at) cryptsoft.com)" 40 * The word 'cryptographic' can be left out if the rouines from the library 41 * being used are not cryptographic related :-). 42 * 4. If you include any Windows specific code (or a derivative thereof) from 43 * the apps directory (application code) you must include an acknowledgement: 44 * "This product includes software written by Tim Hudson (tjh (at) cryptsoft.com)" 45 * 46 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 47 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 48 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 49 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 50 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 51 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 52 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 53 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 54 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 55 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 56 * SUCH DAMAGE. 57 * 58 * The licence and distribution terms for any publically available version or 59 * derivative of this code cannot be changed. i.e. this code cannot simply be 60 * copied and put under another distribution licence 61 * [including the GNU Public Licence.] 62 */ 63 64 #include "des_locl.h" 65 66 #ifdef CBC_ENC_C__DONT_UPDATE_IV 67 void DES_cbc_encrypt(const unsigned char *in, unsigned char *out, long length, 68 DES_key_schedule *_schedule, DES_cblock *ivec, int enc) 69 #else 70 void DES_ncbc_encrypt(const unsigned char *in, unsigned char *out, long length, 71 DES_key_schedule *_schedule, DES_cblock *ivec, int enc) 72 #endif 73 { 74 register DES_LONG tin0,tin1; 75 register DES_LONG tout0,tout1,xor0,xor1; 76 register long l=length; 77 DES_LONG tin[2]; 78 unsigned char *iv; 79 80 iv = &(*ivec)[0]; 81 82 if (enc) 83 { 84 c2l(iv,tout0); 85 c2l(iv,tout1); 86 for (l-=8; l>=0; l-=8) 87 { 88 c2l(in,tin0); 89 c2l(in,tin1); 90 tin0^=tout0; tin[0]=tin0; 91 tin1^=tout1; tin[1]=tin1; 92 DES_encrypt1((DES_LONG *)tin,_schedule,DES_ENCRYPT); 93 tout0=tin[0]; l2c(tout0,out); 94 tout1=tin[1]; l2c(tout1,out); 95 } 96 if (l != -8) 97 { 98 c2ln(in,tin0,tin1,l+8); 99 tin0^=tout0; tin[0]=tin0; 100 tin1^=tout1; tin[1]=tin1; 101 DES_encrypt1((DES_LONG *)tin,_schedule,DES_ENCRYPT); 102 tout0=tin[0]; l2c(tout0,out); 103 tout1=tin[1]; l2c(tout1,out); 104 } 105 #ifndef CBC_ENC_C__DONT_UPDATE_IV 106 iv = &(*ivec)[0]; 107 l2c(tout0,iv); 108 l2c(tout1,iv); 109 #endif 110 } 111 else 112 { 113 c2l(iv,xor0); 114 c2l(iv,xor1); 115 for (l-=8; l>=0; l-=8) 116 { 117 c2l(in,tin0); tin[0]=tin0; 118 c2l(in,tin1); tin[1]=tin1; 119 DES_encrypt1((DES_LONG *)tin,_schedule,DES_DECRYPT); 120 tout0=tin[0]^xor0; 121 tout1=tin[1]^xor1; 122 l2c(tout0,out); 123 l2c(tout1,out); 124 xor0=tin0; 125 xor1=tin1; 126 } 127 if (l != -8) 128 { 129 c2l(in,tin0); tin[0]=tin0; 130 c2l(in,tin1); tin[1]=tin1; 131 DES_encrypt1((DES_LONG *)tin,_schedule,DES_DECRYPT); 132 tout0=tin[0]^xor0; 133 tout1=tin[1]^xor1; 134 l2cn(tout0,tout1,out,l+8); 135 #ifndef CBC_ENC_C__DONT_UPDATE_IV 136 xor0=tin0; 137 xor1=tin1; 138 #endif 139 } 140 #ifndef CBC_ENC_C__DONT_UPDATE_IV 141 iv = &(*ivec)[0]; 142 l2c(xor0,iv); 143 l2c(xor1,iv); 144 #endif 145 } 146 tin0=tin1=tout0=tout1=xor0=xor1=0; 147 tin[0]=tin[1]=0; 148 } 149
