crypto/des/cfb64ede.c - platform/external/openssl - Git at Google

 /* crypto/des/cfb64ede.c */
 /* 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_locl.h"
 #include "e_os.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)
 	{
 	register DES_LONG v0,v1;
 	register long l=length;
 	register 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;
 	}

 #ifdef undef /* MACRO */
 void DES_ede2_cfb64_encrypt(unsigned char *in, unsigned char *out, long length,
 	     DES_key_schedule ks1, DES_key_schedule ks2, DES_cblock (*ivec),
 	     int *num, int enc)
 	{
 	DES_ede3_cfb64_encrypt(in,out,length,ks1,ks2,ks1,ivec,num,enc);
 	}
 #endif

 /* 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)
 	{
 	register DES_LONG d0,d1,v0,v1;
 	register unsigned long l=length,n=((unsigned int)numbits+7)/8;
 	register 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;
 	}
	/* crypto/des/cfb64ede.c */
	/* 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_locl.h"
	#include "e_os.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)
	{
	register DES_LONG v0,v1;
	register long l=length;
	register 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;
	}

	#ifdef undef /* MACRO */
	void DES_ede2_cfb64_encrypt(unsigned char in, unsigned char out, long length,
	DES_key_schedule ks1, DES_key_schedule ks2, DES_cblock (*ivec),
	int *num, int enc)
	{
	DES_ede3_cfb64_encrypt(in,out,length,ks1,ks2,ks1,ivec,num,enc);
	}
	#endif

	/* 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)
	{
	register DES_LONG d0,d1,v0,v1;
	register unsigned long l=length,n=((unsigned int)numbits+7)/8;
	register 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;
	}