/* $Id: openssl-compat.c,v 1.19 2014/07/02 05:28:07 djm Exp $ */

/*
 * Copyright (c) 2005 Darren Tucker <dtucker@zip.com.au>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#define SSH_DONT_OVERLOAD_OPENSSL_FUNCS
#include "includes.h"

#include <stdarg.h>
#include <string.h>

#ifdef USE_OPENSSL_ENGINE
# include <openssl/engine.h>
# include <openssl/conf.h>
#endif

#include "log.h"

#include "openssl-compat.h"

/*
 * OpenSSL version numbers: MNNFFPPS: major minor fix patch status
 * We match major, minor, fix and status (not patch) for <1.0.0.
 * After that, we acceptable compatible fix versions (so we
 * allow 1.0.1 to work with 1.0.0). Going backwards is only allowed
 * within a patch series.
 */

int
ssh_compatible_openssl(long headerver, long libver)
{
	long mask, hfix, lfix;

	/* exact match is always OK */
	if (headerver == libver)
		return 1;

	/* for versions < 1.0.0, major,minor,fix,status must match */
	if (headerver < 0x1000000f) {
		mask = 0xfffff00fL; /* major,minor,fix,status */
		return (headerver & mask) == (libver & mask);
	}
	
	/*
	 * For versions >= 1.0.0, major,minor,status must match and library
	 * fix version must be equal to or newer than the header.
	 */
	mask = 0xfff0000fL; /* major,minor,status */
	hfix = (headerver & 0x000ff000) >> 12;
	lfix = (libver & 0x000ff000) >> 12;
	if ( (headerver & mask) == (libver & mask) && lfix >= hfix)
		return 1;
	return 0;
}

#ifdef	USE_OPENSSL_ENGINE
void
ssh_OpenSSL_add_all_algorithms(void)
{
	OpenSSL_add_all_algorithms();

	/* Enable use of crypto hardware */
	ENGINE_load_builtin_engines();
	ENGINE_register_all_complete();
	OPENSSL_config(NULL);
}
#endif
