GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libcrypto/des/cfb_enc.c Lines: 51 57 89.5 %
Date: 2017-11-07 Branches: 53 60 88.3 %

Line Branch Exec Source
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/* $OpenBSD: cfb_enc.c,v 1.13 2015/02/10 09:46:30 miod Exp $ */
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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 "des_locl.h"
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#include <machine/endian.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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	DES_LONG d0,d1,v0,v1;
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	unsigned long l=length;
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808
	int num=numbits/8,n=(numbits+7)/8,i,rem=numbits%8;
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404
	DES_LONG ti[2];
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	unsigned char *iv;
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#if BYTE_ORDER != LITTLE_ENDIAN
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	unsigned char ovec[16];
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#else
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404
	unsigned int  sh[4];
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404
	unsigned char *ovec=(unsigned char *)sh;
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#endif
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404
	if (numbits<=0 || numbits > 64) return;
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404
	iv = &(*ivec)[0];
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404
	c2l(iv,v0);
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404
	c2l(iv,v1);
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404
	if (enc)
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		{
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4064
		while (l >= (unsigned long)n)
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			{
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8142
			l-=n;
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8142
			ti[0]=v0;
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8142
			ti[1]=v1;
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8142
			DES_encrypt1((DES_LONG *)ti,schedule,DES_ENCRYPT);
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12426
			c2ln(in,d0,d1,n);
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8142
			in+=n;
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8142
			d0^=ti[0];
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8142
			d1^=ti[1];
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12426
			l2cn(d0,d1,out,n);
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3858
			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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3858
			if (numbits == 32)
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				{ v0=v1; v1=d0; }
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3822
			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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#if BYTE_ORDER != LITTLE_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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3804
				sh[0]=v0, sh[1]=v1, sh[2]=d0, sh[3]=d1;
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#endif
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3804
				if (rem==0)
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3804
					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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#if BYTE_ORDER == LITTLE_ENDIAN
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3804
				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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7914
		while (l >= (unsigned long)n)
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			{
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8142
			l-=n;
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8142
			ti[0]=v0;
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8142
			ti[1]=v1;
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8142
			DES_encrypt1((DES_LONG *)ti,schedule,DES_ENCRYPT);
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12426
			c2ln(in,d0,d1,n);
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3858
			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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3858
			if (numbits == 32)
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				{ v0=v1; v1=d0; }
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3822
			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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#if BYTE_ORDER != LITTLE_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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3804
				sh[0]=v0, sh[1]=v1, sh[2]=d0, sh[3]=d1;
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#endif
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3804
				if (rem==0)
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3804
					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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#if BYTE_ORDER == LITTLE_ENDIAN
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3804
				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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8142
			d0^=ti[0];
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8142
			d1^=ti[1];
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12426
			l2cn(d0,d1,out,n);
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3858
			out+=n;
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			}
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		}
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	iv = &(*ivec)[0];
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404
	l2c(v0,iv);
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404
	l2c(v1,iv);
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404
	v0=v1=d0=d1=ti[0]=ti[1]=0;
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808
	}
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