b33abb44fd
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@171 ec53bebd-3082-4978-b11e-865c3cabbd6b
73 lines
1.4 KiB
C
73 lines
1.4 KiB
C
/* cbc_enc.c */
|
|
/* 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);
|
|
}
|
|
|