60643d379b
(Including all changes for FreeBSD - importing the original eBones distribution would be too complex at this stage, since I don't have access to Piero's CVS.) (If you want to include eBones in your system, don't forget to include MAKE_EBONES in /etc/make.conf.) (This stuff is now also suppable from braae.ru.ac.za.) Bones originally from MIT SIPB. Original port to FreeBSD 1.x by Piero Serini. Moved to FreeBSD 2.0 by Doug Rabson and Geoff Rehmet. Nice bug fixes from Doug Rabson.
84 lines
1.5 KiB
C
84 lines
1.5 KiB
C
/* cbc_enc.c */
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/* Copyright (C) 1993 Eric Young - see README for more details */
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/*-
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* $Id: cbc_enc.c,v 1.2 1994/07/19 19:21:47 g89r4222 Exp $
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*/
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#include "des_locl.h"
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int des_cbc_encrypt(input,output,length,schedule,ivec,encrypt)
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des_cblock *input;
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des_cblock *output;
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long length;
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des_key_schedule schedule;
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des_cblock *ivec;
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int encrypt;
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{
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register unsigned long tin0,tin1;
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register unsigned long tout0,tout1,xor0,xor1;
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register unsigned char *in,*out;
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register long l=length;
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unsigned long tout[2],tin[2];
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unsigned char *iv;
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in=(unsigned char *)input;
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out=(unsigned char *)output;
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iv=(unsigned char *)ivec;
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if (encrypt)
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{
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c2l(iv,tout0);
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c2l(iv,tout1);
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for (; l>0; l-=8)
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{
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if (l >= 8)
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{
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c2l(in,tin0);
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c2l(in,tin1);
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}
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else
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c2ln(in,tin0,tin1,l);
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tin0^=tout0;
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tin1^=tout1;
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tin[0]=tin0;
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tin[1]=tin1;
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des_encrypt((unsigned long *)tin,(unsigned long *)tout,
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schedule,encrypt);
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tout0=tout[0];
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tout1=tout[1];
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l2c(tout0,out);
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l2c(tout1,out);
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}
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}
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else
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{
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c2l(iv,xor0);
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c2l(iv,xor1);
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for (; l>0; l-=8)
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{
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c2l(in,tin0);
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c2l(in,tin1);
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tin[0]=tin0;
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tin[1]=tin1;
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des_encrypt((unsigned long *)tin,(unsigned long *)tout,
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schedule,encrypt);
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tout0=tout[0]^xor0;
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tout1=tout[1]^xor1;
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if (l >= 8)
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{
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l2c(tout0,out);
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l2c(tout1,out);
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}
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else
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l2cn(tout0,tout1,out,l);
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xor0=tin0;
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xor1=tin1;
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}
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}
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tin0=tin1=tout0=tout1=xor0=xor1=0;
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tin[0]=tin[1]=tout[0]=tout[1]=0;
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return(0);
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}
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