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/* cbc_enc.c */
/* Copyright (C) 1993 Eric Young - see README for more details */
/*-
* $Id: cbc_enc.c,v 1.2 1994/07/19 19:21:47 g89r4222 Exp $
*/
#include "des_locl.h"
int des_cbc_encrypt(input,output,length,schedule,ivec,encrypt)
des_cblock *input;
des_cblock *output;
long length;
des_key_schedule schedule;
des_cblock *ivec;
int encrypt;
{
register unsigned long tin0,tin1;
register unsigned long tout0,tout1,xor0,xor1;
register unsigned char *in,*out;
register long l=length;
unsigned long tout[2],tin[2];
unsigned char *iv;
in=(unsigned char *)input;
out=(unsigned char *)output;
iv=(unsigned char *)ivec;
if (encrypt)
{
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,encrypt);
tout0=tout[0];
tout1=tout[1];
l2c(tout0,out);
l2c(tout1,out);
}
}
else
{
c2l(iv,xor0);
c2l(iv,xor1);
for (; l>0; l-=8)
{
c2l(in,tin0);
c2l(in,tin1);
tin[0]=tin0;
tin[1]=tin1;
des_encrypt((unsigned long *)tin,(unsigned long *)tout,
schedule,encrypt);
tout0=tout[0]^xor0;
tout1=tout[1]^xor1;
if (l >= 8)
{
l2c(tout0,out);
l2c(tout1,out);
}
else
l2cn(tout0,tout1,out,l);
xor0=tin0;
xor1=tin1;
}
}
tin0=tin1=tout0=tout1=xor0=xor1=0;
tin[0]=tin[1]=tout[0]=tout[1]=0;
return(0);
}
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