Merged in libdes3.21-branch
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@473 ec53bebd-3082-4978-b11e-865c3cabbd6b
This commit is contained in:
Assar Westerlund
@@ -1,5 +1,50 @@
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/* cfb_enc.c */
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/* Copyright (C) 1993 Eric Young - see README for more details */
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/* lib/des/cfb_enc.c */
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/* Copyright (C) 1995 Eric Young (eay@mincom.oz.au)
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* All rights reserved.
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*
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* This file is part of an SSL implementation written
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* by Eric Young (eay@mincom.oz.au).
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* The implementation was written so as to conform with Netscapes SSL
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* specification. This library and applications are
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* FREE FOR COMMERCIAL AND NON-COMMERCIAL USE
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* as long as the following conditions are aheared to.
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed. If this code is used in a product,
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* Eric Young should be given attribution as the author of the parts used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Eric Young (eay@mincom.oz.au)
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include "des_locl.h"
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/* The input and output are loaded in multiples of 8 bits.
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@@ -8,92 +53,108 @@
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* the second. The second 12 bits will come from the 3rd and half the 4th
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* byte.
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*/
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int des_cfb_encrypt(unsigned char *in, unsigned char *out, int numbits, long int length, struct des_ks_struct *schedule, des_cblock (*ivec), int encrypt)
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{
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register u_int32_t d0,d1,v0,v1,n=(numbits+7)/8;
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register u_int32_t mask0,mask1;
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register long l=length;
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register int num=numbits;
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u_int32_t ti[2],to[2];
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unsigned char *iv;
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if (num > 64) return(0);
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if (num > 32)
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{
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mask0=0xffffffff;
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if (num == 64)
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mask1=mask0;
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else
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mask1=(1L<<(num-32))-1;
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}
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else
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{
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if (num == 32)
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mask0=0xffffffff;
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else
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mask0=(1L<<num)-1;
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mask1=0x00000000;
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}
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iv=(unsigned char *)ivec;
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c2l(iv,v0);
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c2l(iv,v1);
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if (encrypt)
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{
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while (l-- > 0)
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void des_cfb_encrypt(in, out, numbits, length, schedule, ivec, encrypt)
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unsigned char *in;
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unsigned char *out;
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int numbits;
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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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ti[0]=v0;
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ti[1]=v1;
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des_encrypt(ti,to,
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schedule,DES_ENCRYPT);
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c2ln(in,d0,d1,n);
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in+=n;
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d0=(d0^to[0])&mask0;
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d1=(d1^to[1])&mask1;
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l2cn(d0,d1,out,n);
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out+=n;
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if (num > 32)
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{
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v0=((v1>>(num-32))|(d0<<(64-num)))&0xffffffff;
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v1=((d0>>(num-32))|(d1<<(64-num)))&0xffffffff;
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}
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else
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{
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v0=((v0>>num)|(v1<<(32-num)))&0xffffffff;
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v1=((v1>>num)|(d0<<(32-num)))&0xffffffff;
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}
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}
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}
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else
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{
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while (l-- > 0)
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{
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ti[0]=v0;
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ti[1]=v1;
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des_encrypt(ti,to,
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schedule,DES_ENCRYPT);
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c2ln(in,d0,d1,n);
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in+=n;
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if (num > 32)
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{
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v0=((v1>>(num-32))|(d0<<(64-num)))&0xffffffff;
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v1=((d0>>(num-32))|(d1<<(64-num)))&0xffffffff;
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}
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else
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{
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v0=((v0>>num)|(v1<<(32-num)))&0xffffffff;
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v1=((v1>>num)|(d0<<(32-num)))&0xffffffff;
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}
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d0=(d0^to[0])&mask0;
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d1=(d1^to[1])&mask1;
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l2cn(d0,d1,out,n);
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out+=n;
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}
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}
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iv=(unsigned char *)ivec;
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l2c(v0,iv);
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l2c(v1,iv);
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v0=v1=d0=d1=ti[0]=ti[1]=to[0]=to[1]=0;
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return(0);
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}
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register unsigned long d0,d1,v0,v1,n=(numbits+7)/8;
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register unsigned long mask0,mask1;
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register unsigned long l=length;
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register int num=numbits;
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unsigned long ti[2];
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unsigned char *iv;
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if (num > 64) return;
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if (num > 32)
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{
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mask0=0xffffffffL;
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if (num == 64)
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mask1=mask0;
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else mask1=(1L<<(num-32))-1;
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}
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else
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{
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if (num == 32)
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mask0=0xffffffffL;
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else mask0=(1L<<num)-1;
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mask1=0x00000000;
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}
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iv=(unsigned char *)ivec;
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c2l(iv,v0);
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c2l(iv,v1);
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if (encrypt)
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{
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while (l >= n)
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{
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l-=n;
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ti[0]=v0;
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ti[1]=v1;
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des_encrypt((unsigned long *)ti,schedule,DES_ENCRYPT);
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c2ln(in,d0,d1,n);
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in+=n;
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d0=(d0^ti[0])&mask0;
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d1=(d1^ti[1])&mask1;
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l2cn(d0,d1,out,n);
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out+=n;
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/* 30-08-94 - eay - changed because l>>32 and
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* l<<32 are bad under gcc :-( */
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if (num == 32)
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{ v0=v1; v1=d0; }
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else if (num == 64)
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{ v0=d0; v1=d1; }
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else if (num > 32) /* && num != 64 */
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{
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v0=((v1>>(num-32))|(d0<<(64-num)))&0xffffffffL;
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v1=((d0>>(num-32))|(d1<<(64-num)))&0xffffffffL;
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}
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else /* num < 32 */
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{
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v0=((v0>>num)|(v1<<(32-num)))&0xffffffffL;
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v1=((v1>>num)|(d0<<(32-num)))&0xffffffffL;
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}
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}
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}
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else
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{
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while (l >= n)
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{
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l-=n;
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ti[0]=v0;
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ti[1]=v1;
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des_encrypt((unsigned long *)ti,schedule,DES_ENCRYPT);
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c2ln(in,d0,d1,n);
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in+=n;
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/* 30-08-94 - eay - changed because l>>32 and
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* l<<32 are bad under gcc :-( */
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if (num == 32)
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{ v0=v1; v1=d0; }
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else if (num == 64)
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{ v0=d0; v1=d1; }
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else if (num > 32) /* && num != 64 */
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{
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v0=((v1>>(num-32))|(d0<<(64-num)))&0xffffffffL;
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v1=((d0>>(num-32))|(d1<<(64-num)))&0xffffffffL;
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}
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else /* num < 32 */
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{
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v0=((v0>>num)|(v1<<(32-num)))&0xffffffffL;
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v1=((v1>>num)|(d0<<(32-num)))&0xffffffffL;
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}
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d0=(d0^ti[0])&mask0;
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d1=(d1^ti[1])&mask1;
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l2cn(d0,d1,out,n);
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out+=n;
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}
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}
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iv=(unsigned char *)ivec;
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l2c(v0,iv);
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l2c(v1,iv);
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v0=v1=d0=d1=ti[0]=ti[1]=0;
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}
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