/* $OpenBSD: cfb64ede.c,v 1.10 2022/11/26 16:08:51 tb Exp $ */ /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) * All rights reserved. * * This package is an SSL implementation written * by Eric Young (eay@cryptsoft.com). * The implementation was written so as to conform with Netscapes SSL. * * This library is free for commercial and non-commercial use as long as * the following conditions are aheared to. The following conditions * apply to all code found in this distribution, be it the RC4, RSA, * lhash, DES, etc., code; not just the SSL code. The SSL documentation * included with this distribution is covered by the same copyright terms * except that the holder is Tim Hudson (tjh@cryptsoft.com). * * Copyright remains Eric Young's, and as such any Copyright notices in * the code are not to be removed. * If this package is used in a product, Eric Young should be given attribution * as the author of the parts of the library used. * This can be in the form of a textual message at program startup or * in documentation (online or textual) provided with the package. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * "This product includes cryptographic software written by * Eric Young (eay@cryptsoft.com)" * The word 'cryptographic' can be left out if the rouines from the library * being used are not cryptographic related :-). * 4. If you include any Windows specific code (or a derivative thereof) from * the apps directory (application code) you must include an acknowledgement: * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" * * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * The licence and distribution terms for any publically available version or * derivative of this code cannot be changed. i.e. this code cannot simply be * copied and put under another distribution licence * [including the GNU Public Licence.] */ #include "des_local.h" /* The input and output encrypted as though 64bit cfb mode is being * used. The extra state information to record how much of the * 64bit block we have used is contained in *num; */ void DES_ede3_cfb64_encrypt(const unsigned char *in, unsigned char *out, long length, DES_key_schedule *ks1, DES_key_schedule *ks2, DES_key_schedule *ks3, DES_cblock *ivec, int *num, int enc) { DES_LONG v0,v1; long l=length; int n= *num; DES_LONG ti[2]; unsigned char *iv,c,cc; iv=&(*ivec)[0]; if (enc) { while (l--) { if (n == 0) { c2l(iv,v0); c2l(iv,v1); ti[0]=v0; ti[1]=v1; DES_encrypt3(ti,ks1,ks2,ks3); v0=ti[0]; v1=ti[1]; iv = &(*ivec)[0]; l2c(v0,iv); l2c(v1,iv); iv = &(*ivec)[0]; } c= *(in++)^iv[n]; *(out++)=c; iv[n]=c; n=(n+1)&0x07; } } else { while (l--) { if (n == 0) { c2l(iv,v0); c2l(iv,v1); ti[0]=v0; ti[1]=v1; DES_encrypt3(ti,ks1,ks2,ks3); v0=ti[0]; v1=ti[1]; iv = &(*ivec)[0]; l2c(v0,iv); l2c(v1,iv); iv = &(*ivec)[0]; } cc= *(in++); c=iv[n]; iv[n]=cc; *(out++)=c^cc; n=(n+1)&0x07; } } v0=v1=ti[0]=ti[1]=c=cc=0; *num=n; } /* This is compatible with the single key CFB-r for DES, even thought that's * not what EVP needs. */ void DES_ede3_cfb_encrypt(const unsigned char *in,unsigned char *out, int numbits,long length,DES_key_schedule *ks1, DES_key_schedule *ks2,DES_key_schedule *ks3, DES_cblock *ivec,int enc) { DES_LONG d0,d1,v0,v1; unsigned long l=length,n=((unsigned int)numbits+7)/8; int num=numbits,i; DES_LONG ti[2]; unsigned char *iv; unsigned char ovec[16]; if (num > 64) return; iv = &(*ivec)[0]; c2l(iv,v0); c2l(iv,v1); if (enc) { while (l >= n) { l-=n; ti[0]=v0; ti[1]=v1; DES_encrypt3(ti,ks1,ks2,ks3); c2ln(in,d0,d1,n); in+=n; d0^=ti[0]; d1^=ti[1]; l2cn(d0,d1,out,n); out+=n; /* 30-08-94 - eay - changed because l>>32 and * l<<32 are bad under gcc :-( */ if (num == 32) { v0=v1; v1=d0; } else if (num == 64) { v0=d0; v1=d1; } else { iv=&ovec[0]; l2c(v0,iv); l2c(v1,iv); l2c(d0,iv); l2c(d1,iv); /* shift ovec left most of the bits... */ memmove(ovec,ovec+num/8,8+(num%8 ? 1 : 0)); /* now the remaining bits */ if(num%8 != 0) for(i=0 ; i < 8 ; ++i) { ovec[i]<<=num%8; ovec[i]|=ovec[i+1]>>(8-num%8); } iv=&ovec[0]; c2l(iv,v0); c2l(iv,v1); } } } else { while (l >= n) { l-=n; ti[0]=v0; ti[1]=v1; DES_encrypt3(ti,ks1,ks2,ks3); c2ln(in,d0,d1,n); in+=n; /* 30-08-94 - eay - changed because l>>32 and * l<<32 are bad under gcc :-( */ if (num == 32) { v0=v1; v1=d0; } else if (num == 64) { v0=d0; v1=d1; } else { iv=&ovec[0]; l2c(v0,iv); l2c(v1,iv); l2c(d0,iv); l2c(d1,iv); /* shift ovec left most of the bits... */ memmove(ovec,ovec+num/8,8+(num%8 ? 1 : 0)); /* now the remaining bits */ if(num%8 != 0) for(i=0 ; i < 8 ; ++i) { ovec[i]<<=num%8; ovec[i]|=ovec[i+1]>>(8-num%8); } iv=&ovec[0]; c2l(iv,v0); c2l(iv,v1); } d0^=ti[0]; d1^=ti[1]; l2cn(d0,d1,out,n); out+=n; } } iv = &(*ivec)[0]; l2c(v0,iv); l2c(v1,iv); v0=v1=d0=d1=ti[0]=ti[1]=0; }