118 lines
3.7 KiB
C
118 lines
3.7 KiB
C
/* crypto/des/cfb64enc.c */
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/* Copyright (C) 1995-1996 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 encrypted as though 64bit cfb mode is being
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* used. The extra state information to record how much of the
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* 64bit block we have used is contained in *num;
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*/
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void des_cfb64_encrypt(in, out, length, schedule, ivec, num, encrypt)
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unsigned char *in;
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unsigned char *out;
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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 *num;
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int encrypt;
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{
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register DES_LONG v0,v1;
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register long l=length;
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register int n= *num;
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DES_LONG ti[2];
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unsigned char *iv,c,cc;
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iv=(unsigned char *)ivec;
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if (encrypt)
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{
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while (l--)
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{
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if (n == 0)
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{
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c2l(iv,v0); ti[0]=v0;
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c2l(iv,v1); ti[1]=v1;
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des_encrypt((DES_LONG *)ti,
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schedule,DES_ENCRYPT);
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iv=(unsigned char *)ivec;
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v0=ti[0]; l2c(v0,iv);
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v0=ti[1]; l2c(v0,iv);
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iv=(unsigned char *)ivec;
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}
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c= *(in++)^iv[n];
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*(out++)=c;
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iv[n]=c;
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n=(n+1)&0x07;
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}
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}
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else
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{
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while (l--)
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{
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if (n == 0)
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{
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c2l(iv,v0); ti[0]=v0;
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c2l(iv,v1); ti[1]=v1;
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des_encrypt((DES_LONG *)ti,
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schedule,DES_ENCRYPT);
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iv=(unsigned char *)ivec;
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v0=ti[0]; l2c(v0,iv);
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v0=ti[1]; l2c(v0,iv);
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iv=(unsigned char *)ivec;
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}
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cc= *(in++);
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c=iv[n];
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iv[n]=cc;
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*(out++)=c^cc;
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n=(n+1)&0x07;
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}
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}
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v0=v1=ti[0]=ti[1]=c=cc=0;
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*num=n;
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}
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