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+/* 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);
+ }
+