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OpenSSL implementing mctls version 0.1
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/* ====================================================================
 * Copyright (c) 1999 The OpenSSL Project.  All rights reserved.
 *
 * 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 above 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 acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    licensing@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED 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 OpenSSL PROJECT OR
 * ITS 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.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

#include <stdio.h>
#include <openssl/bn.h>
#include <string.h>

#include <openssl/e_os2.h>
#if !defined(OPENSSL_SYS_MSDOS) || defined(__DJGPP__) || defined(__MINGW32__)
#include <sys/types.h>
#include <unistd.h>
#else
#include <process.h>
typedef int pid_t;
#endif

#if defined(OPENSSL_SYS_NETWARE) && defined(NETWARE_CLIB)
#define getpid GetThreadID
extern int GetThreadID(void);
#elif defined(_WIN32) && !defined(__WATCOMC__)
#define getpid _getpid
#endif

#include <openssl/crypto.h>
#include <openssl/dso.h>
#include <openssl/engine.h>
#include <openssl/buffer.h>
#ifndef OPENSSL_NO_RSA
#include <openssl/rsa.h>
#endif
#ifndef OPENSSL_NO_DSA
#include <openssl/dsa.h>
#endif
#ifndef OPENSSL_NO_DH
#include <openssl/dh.h>
#endif

#ifndef OPENSSL_NO_HW
#ifndef OPENSSL_NO_HW_AEP
#ifdef FLAT_INC
#include "aep.h"
#else
#include "vendor_defns/aep.h"
#endif

#define AEP_LIB_NAME "aep engine"
#define FAIL_TO_SW 0x10101010

#include "e_aep_err.c"

static int aep_init(ENGINE *e);
static int aep_finish(ENGINE *e);
static int aep_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f)(void));
static int aep_destroy(ENGINE *e);

static AEP_RV aep_get_connection(AEP_CONNECTION_HNDL_PTR hConnection);
static AEP_RV aep_return_connection(AEP_CONNECTION_HNDL hConnection);
static AEP_RV aep_close_connection(AEP_CONNECTION_HNDL hConnection);
static AEP_RV aep_close_all_connections(int use_engine_lock, int *in_use);

/* BIGNUM stuff */
#ifndef OPENSSL_NO_RSA
static int aep_mod_exp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
	const BIGNUM *m, BN_CTX *ctx);

static AEP_RV aep_mod_exp_crt(BIGNUM *r,const  BIGNUM *a, const BIGNUM *p,
	const BIGNUM *q, const BIGNUM *dmp1,const BIGNUM *dmq1,
	const BIGNUM *iqmp, BN_CTX *ctx);
#endif

/* RSA stuff */
#ifndef OPENSSL_NO_RSA
static int aep_rsa_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa, BN_CTX *ctx);
#endif

/* This function is aliased to mod_exp (with the mont stuff dropped). */
#ifndef OPENSSL_NO_RSA
static int aep_mod_exp_mont(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
	const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx);
#endif

/* DSA stuff */
#ifndef OPENSSL_NO_DSA
static int aep_dsa_mod_exp(DSA *dsa, BIGNUM *rr, BIGNUM *a1,
	BIGNUM *p1, BIGNUM *a2, BIGNUM *p2, BIGNUM *m,
	BN_CTX *ctx, BN_MONT_CTX *in_mont);

static int aep_mod_exp_dsa(DSA *dsa, BIGNUM *r, BIGNUM *a,
	const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx,
	BN_MONT_CTX *m_ctx);
#endif

/* DH stuff */
/* This function is aliased to mod_exp (with the DH and mont dropped). */
#ifndef OPENSSL_NO_DH
static int aep_mod_exp_dh(const DH *dh, BIGNUM *r, const BIGNUM *a,
	const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx);
#endif

/* rand stuff   */
#ifdef AEPRAND
static int aep_rand(unsigned char *buf, int num);
static int aep_rand_status(void);
#endif

/* Bignum conversion stuff */
static AEP_RV GetBigNumSize(AEP_VOID_PTR ArbBigNum, AEP_U32* BigNumSize);
static AEP_RV MakeAEPBigNum(AEP_VOID_PTR ArbBigNum, AEP_U32 BigNumSize,
	unsigned char* AEP_BigNum);
static AEP_RV ConvertAEPBigNum(void* ArbBigNum, AEP_U32 BigNumSize,
	unsigned char* AEP_BigNum);

/* The definitions for control commands specific to this engine */
#define AEP_CMD_SO_PATH		ENGINE_CMD_BASE
static const ENGINE_CMD_DEFN aep_cmd_defns[] =
	{
	{ AEP_CMD_SO_PATH,
	  "SO_PATH",
	  "Specifies the path to the 'aep' shared library",
	  ENGINE_CMD_FLAG_STRING
	},
	{0, NULL, NULL, 0}
	};

#ifndef OPENSSL_NO_RSA
/* Our internal RSA_METHOD that we provide pointers to */
static RSA_METHOD aep_rsa =
	{
	"Aep RSA method",
	NULL,                /*rsa_pub_encrypt*/
	NULL,                /*rsa_pub_decrypt*/
	NULL,                /*rsa_priv_encrypt*/
	NULL,                /*rsa_priv_encrypt*/
	aep_rsa_mod_exp,     /*rsa_mod_exp*/
	aep_mod_exp_mont,    /*bn_mod_exp*/
	NULL,                /*init*/
	NULL,                /*finish*/
	0,                   /*flags*/
	NULL,                /*app_data*/
	NULL,                /*rsa_sign*/
	NULL,                /*rsa_verify*/
	NULL                 /*rsa_keygen*/
	};
#endif

#ifndef OPENSSL_NO_DSA
/* Our internal DSA_METHOD that we provide pointers to */
static DSA_METHOD aep_dsa =
	{
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