/* crypto/evp/e_ofb_d.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 <stdio.h>#include "cryptlib.h"#include "evp.h"#include "objects.h"#ifndef NOPROTOstatic void des_ofb_init_key(EVP_CIPHER_CTX *ctx, unsigned char *key,	unsigned char *iv,int enc);static void des_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,	unsigned char *in, unsigned int inl);#elsestatic void des_ofb_init_key();static void des_ofb_cipher();#endifstatic EVP_CIPHER d_ofb_cipher=	{	NID_des_ofb64,	1,8,8,	des_ofb_init_key,	des_ofb_cipher,	NULL,	sizeof(EVP_CIPHER_CTX)-sizeof((((EVP_CIPHER_CTX *)NULL)->c))+		sizeof((((EVP_CIPHER_CTX *)NULL)->c.des_ks)),	EVP_CIPHER_set_asn1_iv,	EVP_CIPHER_get_asn1_iv,	};EVP_CIPHER *EVP_des_ofb()	{	return(&d_ofb_cipher);	}	static void des_ofb_init_key(ctx,key,iv,enc)EVP_CIPHER_CTX *ctx;unsigned char *key;unsigned char *iv;int enc;	{	ctx->num=0;	if (iv != NULL)		memcpy(&(ctx->oiv[0]),iv,8);	memcpy(&(ctx->iv[0]),&(ctx->oiv[0]),8);	if (key != NULL)		des_set_key((des_cblock *)key,ctx->c.des_ks);	}static void des_ofb_cipher(ctx,out,in,inl)EVP_CIPHER_CTX *ctx;unsigned char *out;unsigned char *in;unsigned int inl;	{	des_ofb64_encrypt(		in,out,		(long)inl, ctx->c.des_ks,		(des_cblock *)&(ctx->iv[0]),		&ctx->num);	}