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76 lines
2.3 KiB
C
76 lines
2.3 KiB
C
/*
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* Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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/*
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* From "Message Authentication" R.R. Jueneman, S.M. Matyas, C.H. Meyer IEEE
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* Communications Magazine Sept 1985 Vol. 23 No. 9 p 29-40 This module in
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* only based on the code in this paper and is almost definitely not the same
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* as the MIT implementation.
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*/
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#include "des_locl.h"
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#define Q_B0(a) (((DES_LONG)(a)))
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#define Q_B1(a) (((DES_LONG)(a))<<8)
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#define Q_B2(a) (((DES_LONG)(a))<<16)
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#define Q_B3(a) (((DES_LONG)(a))<<24)
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/* used to scramble things a bit */
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/* Got the value MIT uses via brute force :-) 2/10/90 eay */
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#define NOISE ((DES_LONG)83653421L)
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DES_LONG DES_quad_cksum(const unsigned char *input, DES_cblock output[],
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long length, int out_count, DES_cblock *seed)
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{
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DES_LONG z0, z1, t0, t1;
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int i;
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long l;
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const unsigned char *cp;
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DES_LONG *lp;
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if (out_count < 1)
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out_count = 1;
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lp = (DES_LONG *)&(output[0])[0];
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z0 = Q_B0((*seed)[0]) | Q_B1((*seed)[1]) | Q_B2((*seed)[2]) |
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Q_B3((*seed)[3]);
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z1 = Q_B0((*seed)[4]) | Q_B1((*seed)[5]) | Q_B2((*seed)[6]) |
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Q_B3((*seed)[7]);
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for (i = 0; ((i < 4) && (i < out_count)); i++) {
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cp = input;
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l = length;
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while (l > 0) {
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if (l > 1) {
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t0 = (DES_LONG)(*(cp++));
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t0 |= (DES_LONG)Q_B1(*(cp++));
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l--;
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} else
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t0 = (DES_LONG)(*(cp++));
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l--;
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/* add */
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t0 += z0;
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t0 &= 0xffffffffL;
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t1 = z1;
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/* square, well sort of square */
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z0 = ((((t0 * t0) & 0xffffffffL) + ((t1 * t1) & 0xffffffffL))
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& 0xffffffffL) % 0x7fffffffL;
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z1 = ((t0 * ((t1 + NOISE) & 0xffffffffL)) & 0xffffffffL) %
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0x7fffffffL;
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}
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if (lp != NULL) {
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/*
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* The MIT library assumes that the checksum is composed of
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* 2*out_count 32 bit ints
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*/
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*lp++ = z0;
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*lp++ = z1;
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}
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}
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return z0;
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}
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