| 1 | /*
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| 2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | /*
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| 11 | * From "Message Authentication" R.R. Jueneman, S.M. Matyas, C.H. Meyer IEEE
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| 12 | * Communications Magazine Sept 1985 Vol. 23 No. 9 p 29-40 This module in
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| 13 | * only based on the code in this paper and is almost definitely not the same
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| 14 | * as the MIT implementation.
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| 15 | */
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| 16 | #include "des_locl.h"
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| 17 |
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| 18 | /* bug fix for dos - 7/6/91 - Larry [email protected] */
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| 19 | #define Q_B0(a) (((DES_LONG)(a)))
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| 20 | #define Q_B1(a) (((DES_LONG)(a))<<8)
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| 21 | #define Q_B2(a) (((DES_LONG)(a))<<16)
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| 22 | #define Q_B3(a) (((DES_LONG)(a))<<24)
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| 23 |
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| 24 | /* used to scramble things a bit */
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| 25 | /* Got the value MIT uses via brute force :-) 2/10/90 eay */
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| 26 | #define NOISE ((DES_LONG)83653421L)
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| 27 |
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| 28 | DES_LONG DES_quad_cksum(const unsigned char *input, DES_cblock output[],
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| 29 | long length, int out_count, DES_cblock *seed)
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| 30 | {
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| 31 | DES_LONG z0, z1, t0, t1;
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| 32 | int i;
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| 33 | long l;
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| 34 | const unsigned char *cp;
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| 35 | DES_LONG *lp;
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| 36 |
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| 37 | if (out_count < 1)
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| 38 | out_count = 1;
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| 39 | lp = (DES_LONG *)&(output[0])[0];
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| 40 |
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| 41 | z0 = Q_B0((*seed)[0]) | Q_B1((*seed)[1]) | Q_B2((*seed)[2]) |
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| 42 | Q_B3((*seed)[3]);
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| 43 | z1 = Q_B0((*seed)[4]) | Q_B1((*seed)[5]) | Q_B2((*seed)[6]) |
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| 44 | Q_B3((*seed)[7]);
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| 45 |
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| 46 | for (i = 0; ((i < 4) && (i < out_count)); i++) {
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| 47 | cp = input;
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| 48 | l = length;
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| 49 | while (l > 0) {
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| 50 | if (l > 1) {
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| 51 | t0 = (DES_LONG)(*(cp++));
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| 52 | t0 |= (DES_LONG)Q_B1(*(cp++));
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| 53 | l--;
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| 54 | } else
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| 55 | t0 = (DES_LONG)(*(cp++));
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| 56 | l--;
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| 57 | /* add */
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| 58 | t0 += z0;
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| 59 | t0 &= 0xffffffffL;
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| 60 | t1 = z1;
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| 61 | /* square, well sort of square */
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| 62 | z0 = ((((t0 * t0) & 0xffffffffL) + ((t1 * t1) & 0xffffffffL))
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| 63 | & 0xffffffffL) % 0x7fffffffL;
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| 64 | z1 = ((t0 * ((t1 + NOISE) & 0xffffffffL)) & 0xffffffffL) %
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| 65 | 0x7fffffffL;
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| 66 | }
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| 67 | if (lp != NULL) {
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| 68 | /*
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| 69 | * The MIT library assumes that the checksum is composed of
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| 70 | * 2*out_count 32 bit ints
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| 71 | */
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| 72 | *lp++ = z0;
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| 73 | *lp++ = z1;
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| 74 | }
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| 75 | }
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| 76 | return (z0);
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| 77 | }
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