1 /* crypto/des/cbc_cksm.c */ 2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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 61 DES_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 { 75 if (l >= 8) 76 { 77 c2l(in,tin0); 78 c2l(in,tin1); 79 } 80 else 81 c2ln(in,tin0,tin1,l); 82 83 tin0^=tout0; tin[0]=tin0; 84 tin1^=tout1; tin[1]=tin1; 85 DES_encrypt1((DES_LONG *)tin,schedule,DES_ENCRYPT); 86 /* fix 15/10/91 eay - thanks to keithr (at) sco.COM */ 87 tout0=tin[0]; 88 tout1=tin[1]; 89 } 90 if (out != NULL) 91 { 92 l2c(tout0,out); 93 l2c(tout1,out); 94 } 95 tout0=tin0=tin1=tin[0]=tin[1]=0; 96 /* 97 Transform the data in tout1 so that it will 98 match the return value that the MIT Kerberos 99 mit_des_cbc_cksum API returns. 100 */ 101 tout1 = ((tout1 >> 24L) & 0x000000FF) 102 | ((tout1 >> 8L) & 0x0000FF00) 103 | ((tout1 << 8L) & 0x00FF0000) 104 | ((tout1 << 24L) & 0xFF000000); 105 return(tout1); 106 } 107
