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143 lines
5.4 KiB
143 lines
5.4 KiB
/* crypto/des/qud_cksm.c */ |
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
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* All rights reserved. |
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* |
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* This package is an SSL implementation written |
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* by Eric Young (eay@cryptsoft.com). |
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* The implementation was written so as to conform with Netscapes SSL. |
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* |
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* This library is free for commercial and non-commercial use as long as |
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* the following conditions are aheared to. The following conditions |
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* apply to all code found in this distribution, be it the RC4, RSA, |
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation |
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* included with this distribution is covered by the same copyright terms |
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* except that the holder is Tim Hudson (tjh@cryptsoft.com). |
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* |
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* Copyright remains Eric Young's, and as such any Copyright notices in |
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* the code are not to be removed. |
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* If this package is used in a product, Eric Young should be given attribution |
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* as the author of the parts of the library used. |
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* This can be in the form of a textual message at program startup or |
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* in documentation (online or textual) provided with the package. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. All advertising materials mentioning features or use of this software |
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* must display the following acknowledgement: |
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* "This product includes cryptographic software written by |
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* Eric Young (eay@cryptsoft.com)" |
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* The word 'cryptographic' can be left out if the rouines from the library |
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* being used are not cryptographic related :-). |
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* 4. If you include any Windows specific code (or a derivative thereof) from |
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* the apps directory (application code) you must include an acknowledgement: |
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
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* |
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* |
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* The licence and distribution terms for any publically available version or |
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* derivative of this code cannot be changed. i.e. this code cannot simply be |
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* copied and put under another distribution licence |
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* [including the GNU Public Licence.] |
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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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/* bug fix for dos - 7/6/91 - Larry hughes@logos.ucs.indiana.edu */ |
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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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#ifdef _CRAY |
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struct lp_st { |
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int a:32; |
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int b:32; |
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} *lp; |
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#else |
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DES_LONG *lp; |
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#endif |
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if (out_count < 1) |
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out_count = 1; |
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#ifdef _CRAY |
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lp = (struct lp_st *)&(output[0])[0]; |
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#else |
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lp = (DES_LONG *)&(output[0])[0]; |
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#endif |
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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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#ifdef _CRAY |
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(*lp).a = z0; |
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(*lp).b = z1; |
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lp++; |
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#else |
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*lp++ = z0; |
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*lp++ = z1; |
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#endif |
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} |
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} |
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return (z0); |
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}
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