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/* cbc_cksm.c */
/* Copyright (C) 1993 Eric Young - see README for more details */
/*-
* $Id: cbc_cksm.c,v 1.2 1994/07/19 19:21:45 g89r4222 Exp $
*/
#include "des_locl.h"
unsigned long des_cbc_cksum(input,output,length,schedule,ivec)
des_cblock *input;
des_cblock *output;
long length;
des_key_schedule schedule;
des_cblock *ivec;
{
register unsigned long tout0,tout1,tin0,tin1;
register long l=length;
unsigned long tin[2],tout[2];
unsigned char *in,*out,*iv;
in=(unsigned char *)input;
out=(unsigned char *)output;
iv=(unsigned char *)ivec;
c2l(iv,tout0);
c2l(iv,tout1);
for (; l>0; l-=8)
{
if (l >= 8)
{
c2l(in,tin0);
c2l(in,tin1);
}
else
c2ln(in,tin0,tin1,l);
tin0^=tout0;
tin1^=tout1;
tin[0]=tin0;
tin[1]=tin1;
des_encrypt((unsigned long *)tin,(unsigned long *)tout,
schedule,DES_ENCRYPT);
/* fix 15/10/91 eay - thanks to keithr@sco.COM */
tout0=tout[0];
tout1=tout[1];
}
if (out != NULL)
{
l2c(tout0,out);
l2c(tout1,out);
}
tout0=tin0=tin1=tin[0]=tin[1]=tout[0]=tout[1]=0;
return(tout1);
}
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