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_local.h"
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17 |
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18 | #define Q_B0(a) (((DES_LONG)(a)))
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19 | #define Q_B1(a) (((DES_LONG)(a))<<8)
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20 | #define Q_B2(a) (((DES_LONG)(a))<<16)
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21 | #define Q_B3(a) (((DES_LONG)(a))<<24)
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22 |
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23 | /* used to scramble things a bit */
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24 | /* Got the value MIT uses via brute force :-) 2/10/90 eay */
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25 | #define NOISE ((DES_LONG)83653421L)
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26 |
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27 | DES_LONG DES_quad_cksum(const unsigned char *input, DES_cblock output[],
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28 | long length, int out_count, DES_cblock *seed)
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29 | {
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30 | DES_LONG z0, z1, t0, t1;
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31 | int i;
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32 | long l;
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33 | const unsigned char *cp;
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34 | DES_LONG *lp;
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35 |
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36 | if (out_count < 1)
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37 | out_count = 1;
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38 | lp = (DES_LONG *)&(output[0])[0];
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39 |
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40 | z0 = Q_B0((*seed)[0]) | Q_B1((*seed)[1]) | Q_B2((*seed)[2]) |
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41 | Q_B3((*seed)[3]);
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42 | z1 = Q_B0((*seed)[4]) | Q_B1((*seed)[5]) | Q_B2((*seed)[6]) |
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43 | Q_B3((*seed)[7]);
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44 |
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45 | for (i = 0; ((i < 4) && (i < out_count)); i++) {
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46 | cp = input;
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47 | l = length;
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48 | while (l > 0) {
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49 | if (l > 1) {
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50 | t0 = (DES_LONG)(*(cp++));
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51 | t0 |= (DES_LONG)Q_B1(*(cp++));
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52 | l--;
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53 | } else
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54 | t0 = (DES_LONG)(*(cp++));
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55 | l--;
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56 | /* add */
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57 | t0 += z0;
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58 | t0 &= 0xffffffffL;
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59 | t1 = z1;
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60 | /* square, well sort of square */
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61 | z0 = ((((t0 * t0) & 0xffffffffL) + ((t1 * t1) & 0xffffffffL))
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62 | & 0xffffffffL) % 0x7fffffffL;
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63 | z1 = ((t0 * ((t1 + NOISE) & 0xffffffffL)) & 0xffffffffL) %
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64 | 0x7fffffffL;
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65 | }
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66 | if (lp != NULL) {
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67 | /*
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68 | * The MIT library assumes that the checksum is composed of
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69 | * 2*out_count 32 bit ints
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70 | */
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71 | *lp++ = z0;
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72 | *lp++ = z1;
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73 | }
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74 | }
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75 | return z0;
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76 | }
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