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/* $Id: cbc_enc.c,v 1.1 1995/12/14 06:52:44 tholo Exp $ */
/* Copyright (C) 1993 Eric Young - see README for more details */
#include "des_locl.h"
int des_cbc_encrypt(des_cblock (*input), des_cblock (*output), long int length, struct des_ks_struct *schedule, des_cblock (*ivec), int encrypt)
{
register u_int32_t tin0,tin1;
register u_int32_t tout0,tout1,xor0,xor1;
register unsigned char *in,*out;
register long l=length;
u_int32_t 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(tin,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(tin,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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