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@cryptsoft.com) 8 * All rights reserved. 9 * 10 * This package is an SSL implementation written 11 * by Eric Young (eay@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@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@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@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, 71 long length, DES_key_schedule *_schedule, 72 DES_cblock *ivec, int enc) 73 #endif 74 { 75 register DES_LONG tin0, tin1; 76 register DES_LONG tout0, tout1, xor0, xor1; 77 register long l = length; 78 DES_LONG tin[2]; 79 unsigned char *iv; 80 81 iv = &(*ivec)[0]; 82 83 if (enc) { 84 c2l(iv, tout0); 85 c2l(iv, tout1); 86 for (l -= 8; l >= 0; l -= 8) { 87 c2l(in, tin0); 88 c2l(in, tin1); 89 tin0 ^= tout0; 90 tin[0] = tin0; 91 tin1 ^= tout1; 92 tin[1] = tin1; 93 DES_encrypt1((DES_LONG *)tin, _schedule, DES_ENCRYPT); 94 tout0 = tin[0]; 95 l2c(tout0, out); 96 tout1 = tin[1]; 97 l2c(tout1, out); 98 } 99 if (l != -8) { 100 c2ln(in, tin0, tin1, l + 8); 101 tin0 ^= tout0; 102 tin[0] = tin0; 103 tin1 ^= tout1; 104 tin[1] = tin1; 105 DES_encrypt1((DES_LONG *)tin, _schedule, DES_ENCRYPT); 106 tout0 = tin[0]; 107 l2c(tout0, out); 108 tout1 = tin[1]; 109 l2c(tout1, out); 110 } 111 #ifndef CBC_ENC_C__DONT_UPDATE_IV 112 iv = &(*ivec)[0]; 113 l2c(tout0, iv); 114 l2c(tout1, iv); 115 #endif 116 } else { 117 c2l(iv, xor0); 118 c2l(iv, xor1); 119 for (l -= 8; l >= 0; l -= 8) { 120 c2l(in, tin0); 121 tin[0] = tin0; 122 c2l(in, tin1); 123 tin[1] = tin1; 124 DES_encrypt1((DES_LONG *)tin, _schedule, DES_DECRYPT); 125 tout0 = tin[0] ^ xor0; 126 tout1 = tin[1] ^ xor1; 127 l2c(tout0, out); 128 l2c(tout1, out); 129 xor0 = tin0; 130 xor1 = tin1; 131 } 132 if (l != -8) { 133 c2l(in, tin0); 134 tin[0] = tin0; 135 c2l(in, tin1); 136 tin[1] = tin1; 137 DES_encrypt1((DES_LONG *)tin, _schedule, DES_DECRYPT); 138 tout0 = tin[0] ^ xor0; 139 tout1 = tin[1] ^ xor1; 140 l2cn(tout0, tout1, out, l + 8); 141 #ifndef CBC_ENC_C__DONT_UPDATE_IV 142 xor0 = tin0; 143 xor1 = tin1; 144 #endif 145 } 146 #ifndef CBC_ENC_C__DONT_UPDATE_IV 147 iv = &(*ivec)[0]; 148 l2c(xor0, iv); 149 l2c(xor1, iv); 150 #endif 151 } 152 tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0; 153 tin[0] = tin[1] = 0; 154 } 155