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196 lines
6.0 KiB
C
196 lines
6.0 KiB
C
/* crypto/des/cfb_enc.c */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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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.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library 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 cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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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 "e_os.h"
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#include "des_locl.h"
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#include <assert.h>
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/* The input and output are loaded in multiples of 8 bits.
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* What this means is that if you hame numbits=12 and length=2
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* the first 12 bits will be retrieved from the first byte and half
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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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/* Until Aug 1 2003 this function did not correctly implement CFB-r, so it
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* will not be compatible with any encryption prior to that date. Ben. */
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void DES_cfb_encrypt(const unsigned char *in, unsigned char *out, int numbits,
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long length, DES_key_schedule *schedule, DES_cblock *ivec,
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int enc)
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{
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register DES_LONG d0,d1,v0,v1;
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register unsigned long l=length;
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register int num=numbits/8,n=(numbits+7)/8,i,rem=numbits%8;
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DES_LONG ti[2];
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unsigned char *iv;
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#ifndef L_ENDIAN
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unsigned char ovec[16];
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#else
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unsigned int sh[4];
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unsigned char *ovec=(unsigned char *)sh;
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/* I kind of count that compiler optimizes away this assertioni,*/
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assert (sizeof(sh[0])==4); /* as this holds true for all, */
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/* but 16-bit platforms... */
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#endif
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if (numbits<=0 || numbits > 64) return;
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iv = &(*ivec)[0];
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c2l(iv,v0);
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c2l(iv,v1);
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if (enc)
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{
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while (l >= (unsigned long)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_encrypt1((DES_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^=ti[0];
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d1^=ti[1];
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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 (numbits == 32)
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{ v0=v1; v1=d0; }
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else if (numbits == 64)
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{ v0=d0; v1=d1; }
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else
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{
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#ifndef L_ENDIAN
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iv=&ovec[0];
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l2c(v0,iv);
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l2c(v1,iv);
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l2c(d0,iv);
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l2c(d1,iv);
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#else
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sh[0]=v0, sh[1]=v1, sh[2]=d0, sh[3]=d1;
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#endif
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if (rem==0)
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memmove(ovec,ovec+num,8);
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else
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for(i=0 ; i < 8 ; ++i)
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ovec[i]=ovec[i+num]<<rem |
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ovec[i+num+1]>>(8-rem);
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#ifdef L_ENDIAN
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v0=sh[0], v1=sh[1];
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#else
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iv=&ovec[0];
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c2l(iv,v0);
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c2l(iv,v1);
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#endif
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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 >= (unsigned long)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_encrypt1((DES_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 (numbits == 32)
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{ v0=v1; v1=d0; }
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else if (numbits == 64)
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{ v0=d0; v1=d1; }
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else
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{
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#ifndef L_ENDIAN
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iv=&ovec[0];
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l2c(v0,iv);
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l2c(v1,iv);
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l2c(d0,iv);
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l2c(d1,iv);
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#else
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sh[0]=v0, sh[1]=v1, sh[2]=d0, sh[3]=d1;
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#endif
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if (rem==0)
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memmove(ovec,ovec+num,8);
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else
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for(i=0 ; i < 8 ; ++i)
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ovec[i]=ovec[i+num]<<rem |
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ovec[i+num+1]>>(8-rem);
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#ifdef L_ENDIAN
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v0=sh[0], v1=sh[1];
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#else
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iv=&ovec[0];
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c2l(iv,v0);
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c2l(iv,v1);
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#endif
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}
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d0^=ti[0];
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d1^=ti[1];
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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 = &(*ivec)[0];
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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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