cfb64ede.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
563N/A/* crypto/des/cfb64ede.c */
563N/A/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
563N/A * All rights reserved.
563N/A *
563N/A * This package is an SSL implementation written
563N/A * by Eric Young (eay@cryptsoft.com).
563N/A * The implementation was written so as to conform with Netscapes SSL.
563N/A *
563N/A * This library is free for commercial and non-commercial use as long as
563N/A * the following conditions are aheared to. The following conditions
563N/A * apply to all code found in this distribution, be it the RC4, RSA,
563N/A * lhash, DES, etc., code; not just the SSL code. The SSL documentation
563N/A * included with this distribution is covered by the same copyright terms
563N/A * except that the holder is Tim Hudson (tjh@cryptsoft.com).
563N/A *
563N/A * Copyright remains Eric Young's, and as such any Copyright notices in
563N/A * the code are not to be removed.
563N/A * If this package is used in a product, Eric Young should be given attribution
873N/A * as the author of the parts of the library used.
563N/A * This can be in the form of a textual message at program startup or
563N/A * in documentation (online or textual) provided with the package.
563N/A *
563N/A * Redistribution and use in source and binary forms, with or without
563N/A * modification, are permitted provided that the following conditions
733N/A * are met:
563N/A * 1. Redistributions of source code must retain the copyright
563N/A * notice, this list of conditions and the following disclaimer.
563N/A * 2. Redistributions in binary form must reproduce the above copyright
563N/A * notice, this list of conditions and the following disclaimer in the
1188N/A * documentation and/or other materials provided with the distribution.
563N/A * 3. All advertising materials mentioning features or use of this software
563N/A * must display the following acknowledgement:
1051N/A * "This product includes cryptographic software written by
563N/A * Eric Young (eay@cryptsoft.com)"
662N/A * The word 'cryptographic' can be left out if the rouines from the library
1051N/A * being used are not cryptographic related :-).
563N/A * 4. If you include any Windows specific code (or a derivative thereof) from
1188N/A * the apps directory (application code) you must include an acknowledgement:
1188N/A * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
563N/A *
563N/A * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
563N/A * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
563N/A * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
563N/A * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
563N/A * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
563N/A * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
563N/A * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
563N/A * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
563N/A * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
563N/A * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
563N/A * SUCH DAMAGE.
563N/A *
1051N/A * The licence and distribution terms for any publically available version or
563N/A * derivative of this code cannot be changed. i.e. this code cannot simply be
563N/A * copied and put under another distribution licence
563N/A * [including the GNU Public Licence.]
1188N/A */
1188N/A
1054N/A#include "des_locl.h"
1054N/A
1054N/A/* The input and output encrypted as though 64bit cfb mode is being
563N/A * used. The extra state information to record how much of the
563N/A * 64bit block we have used is contained in *num;
1051N/A */
563N/A
1105N/Avoid DES_ede3_cfb64_encrypt(const unsigned char *in, unsigned char *out,
563N/A long length, DES_key_schedule *ks1,
1126N/A DES_key_schedule *ks2, DES_key_schedule *ks3,
1051N/A DES_cblock *ivec, int *num, int enc)
563N/A {
563N/A register DES_LONG v0,v1;
563N/A register long l=length;
563N/A register int n= *num;
563N/A DES_LONG ti[2];
563N/A unsigned char *iv,c,cc;
563N/A
563N/A iv=&(*ivec)[0];
563N/A if (enc)
563N/A {
1054N/A while (l--)
563N/A {
563N/A if (n == 0)
563N/A {
563N/A c2l(iv,v0);
563N/A c2l(iv,v1);
563N/A
563N/A ti[0]=v0;
563N/A ti[1]=v1;
563N/A DES_encrypt3(ti,ks1,ks2,ks3);
563N/A v0=ti[0];
563N/A v1=ti[1];
563N/A
563N/A iv = &(*ivec)[0];
563N/A l2c(v0,iv);
563N/A l2c(v1,iv);
563N/A iv = &(*ivec)[0];
563N/A }
563N/A c= *(in++)^iv[n];
563N/A *(out++)=c;
563N/A iv[n]=c;
1054N/A n=(n+1)&0x07;
563N/A }
563N/A }
563N/A else
563N/A {
563N/A while (l--)
563N/A {
580N/A if (n == 0)
580N/A {
580N/A c2l(iv,v0);
580N/A c2l(iv,v1);
580N/A
580N/A ti[0]=v0;
580N/A ti[1]=v1;
580N/A DES_encrypt3(ti,ks1,ks2,ks3);
580N/A v0=ti[0];
580N/A v1=ti[1];
563N/A
1051N/A iv = &(*ivec)[0];
563N/A l2c(v0,iv);
1105N/A l2c(v1,iv);
563N/A iv = &(*ivec)[0];
1051N/A }
1073N/A cc= *(in++);
1051N/A c=iv[n];
1054N/A iv[n]=cc;
1051N/A *(out++)=c^cc;
1051N/A n=(n+1)&0x07;
1126N/A }
1051N/A }
1051N/A v0=v1=ti[0]=ti[1]=c=cc=0;
1051N/A *num=n;
563N/A }
563N/A
563N/A#ifdef undef /* MACRO */
563N/Avoid DES_ede2_cfb64_encrypt(unsigned char *in, unsigned char *out, long length,
563N/A DES_key_schedule ks1, DES_key_schedule ks2, DES_cblock (*ivec),
1054N/A int *num, int enc)
563N/A {
563N/A DES_ede3_cfb64_encrypt(in,out,length,ks1,ks2,ks1,ivec,num,enc);
563N/A }
563N/A#endif
563N/A