1 /* crypto/des/qud_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 /* From "Message Authentication" R.R. Jueneman, S.M. Matyas, C.H. Meyer 60 * IEEE Communications Magazine Sept 1985 Vol. 23 No. 9 p 29-40 61 * This module in only based on the code in this paper and is 62 * almost definitely not the same as the MIT implementation. 63 */ 64 #include "des_locl.h" 65 66 /* bug fix for dos - 7/6/91 - Larry hughes (at) logos.ucs.indiana.edu */ 67 #define Q_B0(a) (((DES_LONG)(a))) 68 #define Q_B1(a) (((DES_LONG)(a))<<8) 69 #define Q_B2(a) (((DES_LONG)(a))<<16) 70 #define Q_B3(a) (((DES_LONG)(a))<<24) 71 72 /* used to scramble things a bit */ 73 /* Got the value MIT uses via brute force :-) 2/10/90 eay */ 74 #define NOISE ((DES_LONG)83653421L) 75 76 DES_LONG DES_quad_cksum(const unsigned char *input, DES_cblock output[], 77 long length, int out_count, DES_cblock *seed) 78 { 79 DES_LONG z0,z1,t0,t1; 80 int i; 81 long l; 82 const unsigned char *cp; 83 #ifdef _CRAY 84 struct lp_st { int a:32; int b:32; } *lp; 85 #else 86 DES_LONG *lp; 87 #endif 88 89 if (out_count < 1) out_count=1; 90 #ifdef _CRAY 91 lp = (struct lp_st *) &(output[0])[0]; 92 #else 93 lp = (DES_LONG *) &(output[0])[0]; 94 #endif 95 96 z0=Q_B0((*seed)[0])|Q_B1((*seed)[1])|Q_B2((*seed)[2])|Q_B3((*seed)[3]); 97 z1=Q_B0((*seed)[4])|Q_B1((*seed)[5])|Q_B2((*seed)[6])|Q_B3((*seed)[7]); 98 99 for (i=0; ((i<4)&&(i<out_count)); i++) 100 { 101 cp=input; 102 l=length; 103 while (l > 0) 104 { 105 if (l > 1) 106 { 107 t0= (DES_LONG)(*(cp++)); 108 t0|=(DES_LONG)Q_B1(*(cp++)); 109 l--; 110 } 111 else 112 t0= (DES_LONG)(*(cp++)); 113 l--; 114 /* add */ 115 t0+=z0; 116 t0&=0xffffffffL; 117 t1=z1; 118 /* square, well sort of square */ 119 z0=((((t0*t0)&0xffffffffL)+((t1*t1)&0xffffffffL)) 120 &0xffffffffL)%0x7fffffffL; 121 z1=((t0*((t1+NOISE)&0xffffffffL))&0xffffffffL)%0x7fffffffL; 122 } 123 if (lp != NULL) 124 { 125 /* The MIT library assumes that the checksum is 126 * composed of 2*out_count 32 bit ints */ 127 #ifdef _CRAY 128 (*lp).a = z0; 129 (*lp).b = z1; 130 lp++; 131 #else 132 *lp++ = z0; 133 *lp++ = z1; 134 #endif 135 } 136 } 137 return(z0); 138 } 139 140
