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/* 3cbc_enc.c */
/* Copyright (C) 1993 Eric Young - see README for more details */
/*-
* $Id: 3cbc_enc.c,v 1.1.1.1 1994/09/30 14:49:50 csgr Exp $
*/
#include "des_locl.h"
void
xp(a)
unsigned char *a;
{ int i; for(i=0; i<8; i++) printf("%02X",a[i]);printf("\n");}
int des_3cbc_encrypt(input,output,length,ks1,ks2,iv1,iv2,encrypt)
des_cblock *input;
des_cblock *output;
long length;
des_key_schedule ks1,ks2;
des_cblock *iv1,*iv2;
int encrypt;
{
int off=length/8-1;
des_cblock niv1,niv2;
printf("3cbc\n");
xp(iv1);
xp(iv1);
xp(iv2);
xp(input);
if (encrypt == DES_ENCRYPT)
{
des_cbc_encrypt(input,output,length,ks1,iv1,encrypt);
if (length >= sizeof(des_cblock))
bcopy(output[off],niv1,sizeof(des_cblock));
des_cbc_encrypt(output,output,length,ks2,iv1,!encrypt);
des_cbc_encrypt(output,output,length,ks1,iv2, encrypt);
if (length >= sizeof(des_cblock))
bcopy(output[off],niv2,sizeof(des_cblock));
bcopy(niv1,*iv1,sizeof(des_cblock));
}
else
{
if (length >= sizeof(des_cblock))
bcopy(input[off],niv1,sizeof(des_cblock));
des_cbc_encrypt(input,output,length,ks1,iv1,encrypt);
des_cbc_encrypt(output,output,length,ks2,iv2,!encrypt);
if (length >= sizeof(des_cblock))
bcopy(output[off],niv2,sizeof(des_cblock));
des_cbc_encrypt(output,output,length,ks1,iv2, encrypt);
}
bcopy(niv1,iv1,sizeof(des_cblock));
bcopy(niv2,iv2,sizeof(des_cblock));
xp(iv1);
xp(iv1);
xp(iv2);
xp(output);
return(0);
}
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