| /* crypto/des/qud_cksm.c */ |
| /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
| * All rights reserved. |
| * |
| * This package is an SSL implementation written |
| * by Eric Young (eay@cryptsoft.com). |
| * The implementation was written so as to conform with Netscapes SSL. |
| * |
| * This library is free for commercial and non-commercial use as long as |
| * the following conditions are aheared to. The following conditions |
| * apply to all code found in this distribution, be it the RC4, RSA, |
| * lhash, DES, etc., code; not just the SSL code. The SSL documentation |
| * included with this distribution is covered by the same copyright terms |
| * except that the holder is Tim Hudson (tjh@cryptsoft.com). |
| * |
| * Copyright remains Eric Young's, and as such any Copyright notices in |
| * the code are not to be removed. |
| * If this package is used in a product, Eric Young should be given attribution |
| * as the author of the parts of the library used. |
| * This can be in the form of a textual message at program startup or |
| * in documentation (online or textual) provided with the package. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. All advertising materials mentioning features or use of this software |
| * must display the following acknowledgement: |
| * "This product includes cryptographic software written by |
| * Eric Young (eay@cryptsoft.com)" |
| * The word 'cryptographic' can be left out if the rouines from the library |
| * being used are not cryptographic related :-). |
| * 4. If you include any Windows specific code (or a derivative thereof) from |
| * the apps directory (application code) you must include an acknowledgement: |
| * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
| * |
| * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * |
| * The licence and distribution terms for any publically available version or |
| * derivative of this code cannot be changed. i.e. this code cannot simply be |
| * copied and put under another distribution licence |
| * [including the GNU Public Licence.] |
| */ |
| |
| /* |
| * From "Message Authentication" R.R. Jueneman, S.M. Matyas, C.H. Meyer IEEE |
| * Communications Magazine Sept 1985 Vol. 23 No. 9 p 29-40 This module in |
| * only based on the code in this paper and is almost definitely not the same |
| * as the MIT implementation. |
| */ |
| #include "des_locl.h" |
| |
| /* bug fix for dos - 7/6/91 - Larry hughes@logos.ucs.indiana.edu */ |
| #define Q_B0(a) (((DES_LONG)(a))) |
| #define Q_B1(a) (((DES_LONG)(a))<<8) |
| #define Q_B2(a) (((DES_LONG)(a))<<16) |
| #define Q_B3(a) (((DES_LONG)(a))<<24) |
| |
| /* used to scramble things a bit */ |
| /* Got the value MIT uses via brute force :-) 2/10/90 eay */ |
| #define NOISE ((DES_LONG)83653421L) |
| |
| DES_LONG DES_quad_cksum(const unsigned char *input, DES_cblock output[], |
| long length, int out_count, DES_cblock *seed) |
| { |
| DES_LONG z0, z1, t0, t1; |
| int i; |
| long l; |
| const unsigned char *cp; |
| #ifdef _CRAY |
| struct lp_st { |
| int a:32; |
| int b:32; |
| } *lp; |
| #else |
| DES_LONG *lp; |
| #endif |
| |
| if (out_count < 1) |
| out_count = 1; |
| #ifdef _CRAY |
| lp = (struct lp_st *)&(output[0])[0]; |
| #else |
| lp = (DES_LONG *)&(output[0])[0]; |
| #endif |
| |
| z0 = Q_B0((*seed)[0]) | Q_B1((*seed)[1]) | Q_B2((*seed)[2]) | |
| Q_B3((*seed)[3]); |
| z1 = Q_B0((*seed)[4]) | Q_B1((*seed)[5]) | Q_B2((*seed)[6]) | |
| Q_B3((*seed)[7]); |
| |
| for (i = 0; ((i < 4) && (i < out_count)); i++) { |
| cp = input; |
| l = length; |
| while (l > 0) { |
| if (l > 1) { |
| t0 = (DES_LONG)(*(cp++)); |
| t0 |= (DES_LONG)Q_B1(*(cp++)); |
| l--; |
| } else |
| t0 = (DES_LONG)(*(cp++)); |
| l--; |
| /* add */ |
| t0 += z0; |
| t0 &= 0xffffffffL; |
| t1 = z1; |
| /* square, well sort of square */ |
| z0 = ((((t0 * t0) & 0xffffffffL) + ((t1 * t1) & 0xffffffffL)) |
| & 0xffffffffL) % 0x7fffffffL; |
| z1 = ((t0 * ((t1 + NOISE) & 0xffffffffL)) & 0xffffffffL) % |
| 0x7fffffffL; |
| } |
| if (lp != NULL) { |
| /* |
| * The MIT library assumes that the checksum is composed of |
| * 2*out_count 32 bit ints |
| */ |
| #ifdef _CRAY |
| (*lp).a = z0; |
| (*lp).b = z1; |
| lp++; |
| #else |
| *lp++ = z0; |
| *lp++ = z1; |
| #endif |
| } |
| } |
| return (z0); |
| } |