1/* crypto/des/cbc_cksm.c */ 2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@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@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@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@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 61DES_LONG DES_cbc_cksum(const unsigned char *in, DES_cblock *output, 62 long length, DES_key_schedule *schedule, 63 const_DES_cblock *ivec) 64{ 65 register DES_LONG tout0, tout1, tin0, tin1; 66 register long l = length; 67 DES_LONG tin[2]; 68 unsigned char *out = &(*output)[0]; 69 const unsigned char *iv = &(*ivec)[0]; 70 71 c2l(iv, tout0); 72 c2l(iv, tout1); 73 for (; l > 0; l -= 8) { 74 if (l >= 8) { 75 c2l(in, tin0); 76 c2l(in, tin1); 77 } else 78 c2ln(in, tin0, tin1, l); 79 80 tin0 ^= tout0; 81 tin[0] = tin0; 82 tin1 ^= tout1; 83 tin[1] = tin1; 84 DES_encrypt1((DES_LONG *)tin, schedule, DES_ENCRYPT); 85 /* fix 15/10/91 eay - thanks to keithr@sco.COM */ 86 tout0 = tin[0]; 87 tout1 = tin[1]; 88 } 89 if (out != NULL) { 90 l2c(tout0, out); 91 l2c(tout1, out); 92 } 93 tout0 = tin0 = tin1 = tin[0] = tin[1] = 0; 94 /* 95 * Transform the data in tout1 so that it will match the return value 96 * that the MIT Kerberos mit_des_cbc_cksum API returns. 97 */ 98 tout1 = ((tout1 >> 24L) & 0x000000FF) 99 | ((tout1 >> 8L) & 0x0000FF00) 100 | ((tout1 << 8L) & 0x00FF0000) 101 | ((tout1 << 24L) & 0xFF000000); 102 return (tout1); 103} 104