/* Written by Corinne Dive-Reclus(cdive@baltimore.com)
* 
*
* 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/)"
*
* Written by Corinne Dive-Reclus(cdive@baltimore.com)
*
* Copyright@2001 Baltimore Technologies Ltd.
* All right Reserved.
*																								*	
*		THIS FILE IS PROVIDED BY BALTIMORE TECHNOLOGIES ``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 BALTIMORE TECHNOLOGIES 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.																			*
====================================================================*/

#include <stdio.h>
#include <string.h>
#include <openssl/crypto.h>
#include <openssl/pem.h>
#include <openssl/dso.h>
#include <openssl/engine.h>

#ifndef OPENSSL_NO_HW
#ifndef OPENSSL_NO_HW_SUREWARE

#ifdef FLAT_INC
#include "sureware.h"
#else
#include "vendor_defns/sureware.h"
#endif

#define SUREWARE_LIB_NAME "sureware engine"
#include "e_sureware_err.c"

static int surewarehk_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f)(void));
static int surewarehk_destroy(ENGINE *e);
static int surewarehk_init(ENGINE *e);
static int surewarehk_finish(ENGINE *e);
static int surewarehk_modexp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
	const BIGNUM *m, BN_CTX *ctx);

/* RSA stuff */
static int surewarehk_rsa_priv_dec(int flen,const unsigned char *from,unsigned char *to,
			RSA *rsa,int padding);
static int surewarehk_rsa_sign(int flen,const unsigned char *from,unsigned char *to,
			    RSA *rsa,int padding);

/* RAND stuff */
static int surewarehk_rand_bytes(unsigned char *buf, int num);
static void surewarehk_rand_seed(const void *buf, int num);
static void surewarehk_rand_add(const void *buf, int num, double entropy);

/* KM stuff */
static EVP_PKEY *surewarehk_load_privkey(ENGINE *e, const char *key_id,
	UI_METHOD *ui_method, void *callback_data);
static EVP_PKEY *surewarehk_load_pubkey(ENGINE *e, const char *key_id,
	UI_METHOD *ui_method, void *callback_data);
static void surewarehk_ex_free(void *obj, void *item, CRYPTO_EX_DATA *ad,
	int idx,long argl, void *argp);
#if 0
static void surewarehk_dh_ex_free(void *obj, void *item, CRYPTO_EX_DATA *ad,
	int idx,long argl, void *argp);
#endif

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

/* Our internal RSA_METHOD that we provide pointers to */
static RSA_METHOD surewarehk_rsa =
	{
	"SureWare RSA method",
	NULL, /* pub_enc*/
	NULL, /* pub_dec*/
	surewarehk_rsa_sign, /* our rsa_sign is OpenSSL priv_enc*/
	surewarehk_rsa_priv_dec, /* priv_dec*/
	NULL, /*mod_exp*/
	surewarehk_mod_exp_mont, /*mod_exp_mongomery*/
	NULL, /* init*/
	NULL, /* finish*/
	0,	/* RSA flag*/
	NULL, 
	NULL, /* OpenSSL sign*/
	NULL, /* OpenSSL verify*/
	NULL  /* keygen */
	};
#endif

#ifndef OPENSSL_NO_DH
/* Our internal DH_METHOD that we provide pointers to */
/* This function is aliased to mod_exp (with the dh and mont dropped). */
static int surewarehk_modexp_dh(const DH *dh, BIGNUM *r, const BIGNUM *a,
	const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx)
{
	return surewarehk_modexp(r, a, p, m, ctx);
}

static DH_METHOD surewarehk_dh =
	{
	"SureWare DH method",
	NULL,/*gen_key*/
	NULL,/*agree,*/
	surewarehk_modexp_dh, /*dh mod exp*/
	NULL, /* init*/
	NULL, /* finish*/
	0,    /* flags*/
	NULL,
	NULL
	};
#endif

static RAND_METHOD surewarehk_rand =
	{
	/* "SureWare RAND method", */
	surewarehk_rand_seed,
	surewarehk_rand_bytes,
	NULL,/*cleanup*/
	surewarehk_rand_add,
	surewarehk_rand_bytes,
	NULL,/*rand_status*/
	};

#ifndef OPENSSL_NO_DSA
/* DSA stuff */
static	DSA_SIG * surewarehk_dsa_do_sign(const unsigned char *dgst, int dlen, DSA *dsa);
static int surewarehk_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)
{
	BIGNUM t;
	int to_return = 0;
	BN_init(&t);
	/* let rr = a1 ^ p1 mod m */
	if (!surewarehk_modexp(rr,a1,p1,m,ctx)) goto end;
	/* let t = a2 ^ p2 mod m */
	if (!surewarehk_modexp(&t,a2,p2,m,ctx)) goto end;
	/* let rr = rr * t mod m */
	if (!BN_mod_mul(rr,rr,&t,m,ctx)) goto end;
	to_return = 1;
end:
	BN_free(&t);
	return to_return;
}

static DSA_METHOD surewarehk_dsa =
	{
	 "SureWare DSA method", 
	surewarehk_dsa_do_sign,
	NULL,/*sign setup*/
	NULL,/*verify,*/
	surewarehk_dsa_mod_exp,/*mod exp*/
	NULL,/*bn mod exp*/
	NULL, /*init*/
	NULL,/*finish*/
	0,
	NULL,
	NULL,
	NULL
	};
#endif

static const char *engine_sureware_id = "sureware";
static const char *engine_sureware_name = "SureWare hardware engine support";

/* Now, to our own code */

/* As this is only ever called once, there's no need for locking
 * (indeed - the lock will already be held by our caller!!!) */
static int bind_sureware(ENGINE *e)
{
#ifndef OPENSSL_NO_RSA
	const RSA_METHOD *meth1;
#endif
#ifndef OPENSSL_NO_DSA
	const DSA_METHOD *meth2;
#endif
#ifndef OPENSSL_NO_DH
	const DH_METHOD *meth3;
#endif

	if(!ENGINE_set_id(e, engine_sureware_id) ||
	   !ENGINE_set_name(e, engine_sureware_name) ||
#ifndef OPENSSL_NO_RSA
	   !ENGINE_set_RSA(e, &surewarehk_rsa) ||
#endif
#ifndef OPENSSL_NO_DSA
	   !ENGINE_set_DSA(e, &surewarehk_dsa) ||
#endif
#ifndef OPENSSL_NO_DH
	   !ENGINE_set_DH(e, &surewarehk_dh) ||
#endif
	   !ENGINE_set_RAND(e, &surewarehk_rand) ||
	   !ENGINE_set_destroy_function(e, surewarehk_destroy) ||
	   !ENGINE_set_init_function(e, surewarehk_init) ||
	   !ENGINE_set_finish_function(e, surewarehk_finish) ||
	   !ENGINE_set_ctrl_function(e, surewarehk_ctrl) ||
	   !ENGINE_set_load_privkey_function(e, surewarehk_load_privkey) ||
	   !ENGINE_set_load_pubkey_function(e, surewarehk_load_pubkey))
	  return 0;

#ifndef OPENSSL_NO_RSA
	/* We know that the "PKCS1_SSLeay()" functions hook properly
	 * to the cswift-specific mod_exp and mod_exp_crt so we use
	 * those functions. NB: We don't use ENGINE_openssl() or
	 * anything "more generic" because something like the RSAref
	 * code may not hook properly, and if you own one of these
	 * cards then you have the right to do RSA operations on it
	 * anyway! */ 
	meth1 = RSA_PKCS1_SSLeay();
	if (meth1)
	{
		surewarehk_rsa.rsa_pub_enc = meth1->rsa_pub_enc;
		surewarehk_rsa.rsa_pub_dec = meth1->rsa_pub_dec;
	}
#endif

#ifndef OPENSSL_NO_DSA
	/* Use the DSA_OpenSSL() method and just hook the mod_exp-ish
	 * bits. */
	meth2 = DSA_OpenSSL();
	if (meth2)
	{
		surewarehk_dsa.dsa_do_verify = meth2->dsa_do_verify;
	}
#endif

#ifndef OPENSSL_NO_DH
	/* Much the same for Diffie-Hellman */
	meth3 = DH_OpenSSL();
	if (meth3)
	{
		surewarehk_dh.generate_key = meth3->generate_key;
		surewarehk_dh.compute_key = meth3->compute_key;
	}
#endif

	/* Ensure the sureware error handling is set up */
	ERR_load_SUREWARE_strings();
	return 1;
}

#ifndef OPENSSL_NO_DYNAMIC_ENGINE
static int bind_helper(ENGINE *e, const char *id)
	{
	if(id && (strcmp(id, engine_sureware_id) != 0))
		return 0;
	if(!bind_sureware(e))
		return 0;
	return 1;
	}       
IMPLEMENT_DYNAMIC_CHECK_FN()
IMPLEMENT_DYNAMIC_BIND_FN(bind_helper)
#else
static ENGINE *engine_sureware(void)
	{
	ENGINE *ret = ENGINE_new();
	if(!ret)
		return NULL;
	if(!bind_sureware(ret))
		{
		ENGINE_free(ret);
		return NULL;
		}
	return ret;
	}

void ENGINE_load_sureware(void)
	{
	/* Copied from eng_[openssl|dyn].c */
	ENGINE *toadd = engine_sureware();
	if(!toadd) return;
	ENGINE_add(toadd);
	ENGINE_free(toadd);
	ERR_clear_error();
	}
#endif

/* This is a process-global DSO handle used for loading and unloading
 * the SureWareHook library. NB: This is only set (or unset) during an
 * init() or finish() call (reference counts permitting) and they're
 * operating with global locks, so this should be thread-safe
 * implicitly. */
static DSO *surewarehk_dso = NULL;
#ifndef OPENSSL_NO_RSA
static int rsaHndidx = -1;	/* Index for KM handle.  Not really used yet. */
#endif
#ifndef OPENSSL_NO_DSA
static int dsaHndidx = -1;	/* Index for KM handle.  Not really used yet. */
#endif

/* These are the function pointers that are (un)set when the library has
 * successfully (un)loaded. */
static SureWareHook_Init_t *p_surewarehk_Init = NULL;
static SureWareHook_Finish_t *p_surewarehk_Finish = NULL;
static SureWareHook_Rand_Bytes_t *p_surewarehk_Rand_Bytes = NULL;
static SureWareHook_Rand_Seed_t *p_surewarehk_Rand_Seed = NULL;
static SureWareHook_Load_Privkey_t *p_surewarehk_Load_Privkey = NULL;
static SureWareHook_Info_Pubkey_t *p_surewarehk_Info_Pubkey = NULL;
static SureWareHook_Load_Rsa_Pubkey_t *p_surewarehk_Load_Rsa_Pubkey = NULL;
static SureWareHook_Load_Dsa_Pubkey_t *p_surewarehk_Load_Dsa_Pubkey = NULL;
static SureWareHook_Free_t *p_surewarehk_Free=NULL;
static SureWareHook_Rsa_Priv_Dec_t *p_surewarehk_Rsa_Priv_Dec=NULL;
static SureWareHook_Rsa_Sign_t *p_surewarehk_Rsa_Sign=NULL;
static SureWareHook_Dsa_Sign_t *p_surewarehk_Dsa_Sign=NULL;
static SureWareHook_Mod_Exp_t *p_surewarehk_Mod_Exp=NULL;

/* Used in the DSO operations. */
static const char *surewarehk_LIBNAME = "SureWareHook";
static const char *n_surewarehk_Init = "SureWareHook_Init";
static const char *n_surewarehk_Finish = "SureWareHook_Finish";
static const char *n_surewarehk_Rand_Bytes="SureWareHook_Rand_Bytes";
static const char *n_surewarehk_Rand_Seed="SureWareHook_Rand_Seed";
static const char *n_surewarehk_Load_Privkey="SureWareHook_Load_Privkey";
static const char *n_surewarehk_Info_Pubkey="SureWareHook_Info_Pubkey";
static const char *n_surewarehk_Load_Rsa_Pubkey="SureWareHook_Load_Rsa_Pubkey";
static const char *n_surewarehk_Load_Dsa_Pubkey="SureWareHook_Load_Dsa_Pubkey";
static const char *n_surewarehk_Free="SureWareHook_Free";
static const char *n_surewarehk_Rsa_Priv_Dec="SureWareHook_Rsa_Priv_Dec";
static const char *n_surewarehk_Rsa_Sign="SureWareHook_Rsa_Sign";
static const char *n_surewarehk_Dsa_Sign="SureWareHook_Dsa_Sign";
static const char *n_surewarehk_Mod_Exp="SureWareHook_Mod_Exp";
static BIO *logstream = NULL;

/* SureWareHook library functions and mechanics - these are used by the
 * higher-level functions further down. NB: As and where there's no
 * error checking, take a look lower down where these functions are
 * called, the checking and error handling is probably down there. 
*/
static int threadsafe=1;
static int surewarehk_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f)(void))
{
	int to_return = 1;

	switch(cmd)
	{
		case ENGINE_CTRL_SET_LOGSTREAM:
		{
			BIO *bio = (BIO *)p;
			CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
			if (logstream)
			{
				BIO_free(logstream);
				logstream = NULL;
			}
			if (CRYPTO_add(&bio->references,1,CRYPTO_LOCK_BIO) > 1)
				logstream = bio;
			else
				SUREWAREerr(SUREWARE_F_SUREWAREHK_CTRL,SUREWARE_R_BIO_WAS_FREED);
		}
		CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
		break;
	/* This will prevent the initialisation function from "installing"
	 * the mutex-handling callbacks, even if they are available from
	 * within the library (or were provided to the library from the
	 * calling application). This is to remove any baggage for
	 * applications not using multithreading. */
	case ENGINE_CTRL_CHIL_NO_LOCKING:
		CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
		threadsafe = 0;
		CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
		break;

	/* The command isn't understood by this engine */
	default:
		SUREWAREerr(SUREWARE_F_SUREWAREHK_CTRL,
			ENGINE_R_CTRL_COMMAND_NOT_IMPLEMENTED);
		to_return = 0;
		break;
		}

	return to_return;
}

/* Destructor (complements the "ENGINE_surewarehk()" constructor) */
static int surewarehk_destroy(ENGINE *e)
{
	ERR_unload_SUREWARE_strings();
	return 1;
}

/* (de)initialisation functions. */
static int surewarehk_init(ENGINE *e)
{
	char msg[64]="ENGINE_init";
	SureWareHook_Init_t *p1=NULL;
	SureWareHook_Finish_t *p2=NULL;
	SureWareHook_Rand_Bytes_t *p3=NULL;
	SureWareHook_Rand_Seed_t *p4=NULL;
	SureWareHook_Load_Privkey_t *p5=NULL;
	SureWareHook_Load_Rsa_Pubkey_t *p6=NULL;
	SureWareHook_Free_t *p7=NULL;
	SureWareHook_Rsa_Priv_Dec_t *p8=NULL;
	SureWareHook_Rsa_Sign_t *p9=NULL;
	SureWareHook_Dsa_Sign_t *p12=NULL;
	SureWareHook_Info_Pubkey_t *p13=NULL;
	SureWareHook_Load_Dsa_Pubkey_t *p14=NULL;
	SureWareHook_Mod_Exp_t *p15=NULL;

	if(surewarehk_dso != NULL)
	{
		SUREWAREerr(SUREWARE_F_SUREWAREHK_INIT,ENGINE_R_ALREADY_LOADED);
		goto err;
	}
	/* Attempt to load libsurewarehk.so/surewarehk.dll/whatever. */
	surewarehk_dso = DSO_load(NULL, surewarehk_LIBNAME, NULL, 0);
	if(surewarehk_dso == NULL)
	{
		SUREWAREerr(SUREWARE_F_SUREWAREHK_INIT,ENGINE_R_DSO_FAILURE);
		goto err;
	}
	if(!(p1=(SureWareHook_Init_t*)DSO_bind_func(surewarehk_dso, n_surewarehk_Init)) ||
	   !(p2=(SureWareHook_Finish_t*)DSO_bind_func(surewarehk_dso, n_surewarehk_Finish)) ||
	   !(p3=(SureWareHook_Rand_Bytes_t*)DSO_bind_func(surewarehk_dso, n_surewarehk_Rand_Bytes)) ||
	   !(p4=(SureWareHook_Rand_Seed_t*)DSO_bind_func(surewarehk_dso, n_surewarehk_Rand_Seed)) ||
	   !(p5=(SureWareHook_Load_Privkey_t*)DSO_bind_func(surewarehk_dso, n_surewarehk_Load_Privkey)) ||
	   !(p6=(SureWareHook_Load_Rsa_Pubkey_t*)DSO_bind_func(surewarehk_dso, n_surewarehk_Load_Rsa_Pubkey)) ||
	   !(p7=(SureWareHook_Free_t*)DSO_bind_func(surewarehk_dso, n_surewarehk_Free)) ||
	   !(p8=(SureWareHook_Rsa_Priv_Dec_t*)DSO_bind_func(surewarehk_dso, n_surewarehk_Rsa_Priv_Dec)) ||
	   !(p9=(SureWareHook_Rsa_Sign_t*)DSO_bind_func(surewarehk_dso, n_surewarehk_Rsa_Sign)) ||
	   !(p12=(SureWareHook_Dsa_Sign_t*)DSO_bind_func(surewarehk_dso, n_surewarehk_Dsa_Sign)) ||
	   !(p13=(SureWareHook_Info_Pubkey_t*)DSO_bind_func(surewarehk_dso, n_surewarehk_Info_Pubkey)) ||
	   !(p14=(SureWareHook_Load_Dsa_Pubkey_t*)DSO_bind_func(surewarehk_dso, n_surewarehk_Load_Dsa_Pubkey)) ||
	   !(p15=(SureWareHook_Mod_Exp_t*)DSO_bind_func(surewarehk_dso, n_surewarehk_Mod_Exp)))
	{
		SUREWAREerr(SUREWARE_F_SUREWAREHK_INIT,ENGINE_R_DSO_FAILURE);
		goto err;
	}
	/* Copy the pointers */
	p_surewarehk_Init = p1;
	p_surewarehk_Finish = p2;
	p_surewarehk_Rand_Bytes = p3;
	p_surewarehk_Rand_Seed = p4;
	p_surewarehk_Load_Privkey = p5;
	p_surewarehk_Load_Rsa_Pubkey = p6;
	p_surewarehk_Free = p7;
	p_surewarehk_Rsa_Priv_Dec = p8;
	p_surewarehk_Rsa_Sign = p9;
	p_surewarehk_Dsa_Sign = p12;
	p_surewarehk_Info_Pubkey = p13;
	p_surewarehk_Load_Dsa_Pubkey = p14;
	p_surewarehk_Mod_Exp = p15;
	/* Contact the hardware and initialises it. */
	if(p_surewarehk_Init(msg,threadsafe)==SUREWAREHOOK_ERROR_UNIT_FAILURE)
	{
		SUREWAREerr(SUREWARE_F_SUREWAREHK_INIT,SUREWARE_R_UNIT_FAILURE);
		goto err;
	}
	if(p_surewarehk_Init(msg,threadsafe)==SUREWAREHOOK_ERROR_UNIT_FAILURE)
	{
		SUREWAREerr(SUREWARE_F_SUREWAREHK_INIT,SUREWARE_R_UNIT_FAILURE);
		goto err;
	}
	/* try to load the default private key, if failed does not return a failure but
           wait for an explicit ENGINE_load_privakey */
	surewarehk_load_privkey(e,NULL,NULL,NULL);

	/* Everything's fine. */
#ifndef OPENSSL_NO_RSA
	if (rsaHndidx == -1)
		rsaHndidx = RSA_get_ex_new_index(0,
						"SureWareHook RSA key handle",
						NULL, NULL, surewarehk_ex_free);
#endif
#ifndef OPENSSL_NO_DSA
	if (dsaHndidx == -1)
		dsaHndidx = DSA_get_ex_new_index(0,
						"SureWareHook DSA key handle",
						NULL, NULL, surewarehk_ex_free);
#endif

	return 1;
err:
	if(surewarehk_dso)
		DSO_free(surewarehk_dso);
	surewarehk_dso = NULL;
	p_surewarehk_Init = NULL;
	p_surewarehk_Finish = NULL;
	p_surewarehk_Rand_Bytes = NULL;
	p_surewarehk_Rand_Seed = NULL;
	p_surewarehk_Load_Privkey = NULL;
	p_surewarehk_Load_Rsa_Pubkey = NULL;
	p_surewarehk_Free = NULL;
	p_surewarehk_Rsa_Priv_Dec = NULL;
	p_surewarehk_Rsa_Sign = NULL;
	p_surewarehk_Dsa_Sign = NULL;
	p_surewarehk_Info_Pubkey = NULL;
	p_surewarehk_Load_Dsa_Pubkey = NULL;
	p_surewarehk_Mod_Exp = NULL;
	return 0;
}

static int surewarehk_finish(ENGINE *e)
{
	int to_return = 1;
	if(surewarehk_dso == NULL)
		{
		SUREWAREerr(SUREWARE_F_SUREWAREHK_FINISH,ENGINE_R_NOT_LOADED);
		to_return = 0;
		goto err;
		}
	p_surewarehk_Finish();
	if(!DSO_free(surewarehk_dso))
		{
		SUREWAREerr(SUREWARE_F_SUREWAREHK_FINISH,ENGINE_R_DSO_FAILURE);
		to_return = 0;
		goto err;
		}
 err:
	if (logstream)
		BIO_free(logstream);
	surewarehk_dso = NULL;
	p_surewarehk_Init = NULL;
	p_surewarehk_Finish = NULL;
	p_surewarehk_Rand_Bytes = NULL;
	p_surewarehk_Rand_Seed = NULL;
	p_surewarehk_Load_Privkey = NULL;
	p_surewarehk_Load_Rsa_Pubkey = NULL;
	p_surewarehk_Free = NULL;
	p_surewarehk_Rsa_Priv_Dec = NULL;
	p_surewarehk_Rsa_Sign = NULL;
	p_surewarehk_Dsa_Sign = NULL;
	p_surewarehk_Info_Pubkey = NULL;
	p_surewarehk_Load_Dsa_Pubkey = NULL;
	p_surewarehk_Mod_Exp = NULL;
	return to_return;
}

static void surewarehk_error_handling(char *const msg,int func,int ret)
{
	switch (ret)
	{
		case SUREWAREHOOK_ERROR_UNIT_FAILURE:
			ENGINEerr(func,SUREWARE_R_UNIT_FAILURE);
			break;
		case SUREWAREHOOK_ERROR_FALLBACK:
			ENGINEerr(func,SUREWARE_R_REQUEST_FALLBACK);
			break;
		case SUREWAREHOOK_ERROR_DATA_SIZE:
			ENGINEerr(func,SUREWARE_R_SIZE_TOO_LARGE_OR_TOO_SMALL);
			break;
		case SUREWAREHOOK_ERROR_INVALID_PAD:
			ENGINEerr(func,RSA_R_PADDING_CHECK_FAILED);
			break;
		default:
			ENGINEerr(func,SUREWARE_R_REQUEST_FAILED);
			break;
		case 1:/*nothing*/
			msg[0]='\0';
	}
	if (*msg)
	{
		ERR_add_error_data(1,msg);
		if (logstream)
		{
			CRYPTO_w_lock(CRYPTO_LOCK_BIO);
			BIO_write(logstream, msg, strlen(msg));
			CRYPTO_w_unlock(CRYPTO_LOCK_BIO);
		}
	}
}

static int surewarehk_rand_bytes(unsigned char *buf, int num)
{
	int ret=0;
	char msg[64]="ENGINE_rand_bytes";
	if(!p_surewarehk_Rand_Bytes)
	{
		SUREWAREerr(SUREWARE_F_SUREWAREHK_RAND_BYTES,ENGINE_R_NOT_INITIALISED);
	}
	else
	{
		ret = p_surewarehk_Rand_Bytes(msg,buf, num);
		surewarehk_error_handling(msg,SUREWARE_F_SUREWAREHK_RAND_BYTES,ret);
	}
	return ret==1 ? 1 : 0;
}

static void surewarehk_rand_seed(const void *buf, int num)
{
	int ret=0;
	char msg[64]="ENGINE_rand_seed";
	if(!p_surewarehk_Rand_Seed)
	{
		SUREWAREerr(SUREWARE_F_SUREWAREHK_RAND_SEED,ENGINE_R_NOT_INITIALISED);
	}
	else
	{
		ret = p_surewarehk_Rand_Seed(msg,buf, num);
		surewarehk_error_handling(msg,SUREWARE_F_SUREWAREHK_RAND_SEED,ret);
	}
}

static void surewarehk_rand_add(const void *buf, int num, double entropy)
{
	surewarehk_rand_seed(buf,num);
}

static EVP_PKEY* sureware_load_public(ENGINE *e,const char *key_id,char *hptr,unsigned long el,char keytype)
{
	EVP_PKEY *res = NULL;
#ifndef OPENSSL_NO_RSA
	RSA *rsatmp = NULL;
#endif
#ifndef OPENSSL_NO_DSA
	DSA *dsatmp=NULL;
#endif
	char msg[64]="sureware_load_public";
	int ret=0;
	if(!p_surewarehk_Load_Rsa_Pubkey || !p_surewarehk_Load_Dsa_Pubkey)
	{
		SUREWAREerr(SUREWARE_F_SUREWAREHK_LOAD_PUBLIC_KEY,ENGINE_R_NOT_INITIALISED);
		goto err;
	}
	switch (keytype)
	{
#ifndef OPENSSL_NO_RSA
	case 1: /*RSA*/
		/* set private external reference */
		rsatmp = RSA_new_method(e);
		RSA_set_ex_data(rsatmp,rsaHndidx,hptr);
		rsatmp->flags |= RSA_FLAG_EXT_PKEY;

		/* set public big nums*/
		rsatmp->e = BN_new();
		rsatmp->n = BN_new();
		bn_expand2(rsatmp->e, el/sizeof(BN_ULONG));
		bn_expand2(rsatmp->n, el/sizeof(BN_ULONG));
		if (!rsatmp->e || rsatmp->e->dmax!=(int)(el/sizeof(BN_ULONG))|| 
			!rsatmp->n || rsatmp->n->dmax!=(int)(el/sizeof(BN_ULONG)))
			goto err;
		ret=p_surewarehk_Load_Rsa_Pubkey(msg,key_id,el,
						 (unsigned long *)rsatmp->n->d,
						 (unsigned long *)rsatmp->e->d);
		surewarehk_error_handling(msg,SUREWARE_F_SUREWAREHK_LOAD_PUBLIC_KEY,ret);
		if (ret!=1)
		{
			SUREWAREerr(SUREWARE_F_SUREWAREHK_LOAD_PRIVATE_KEY,ENGINE_R_FAILED_LOADING_PUBLIC_KEY);
			goto err;
		}
		/* normalise pub e and pub n */
		rsatmp->e->top=el/sizeof(BN_ULONG);
		bn_fix_top(rsatmp->e);
		rsatmp->n->top=el/sizeof(BN_ULONG);
		bn_fix_top(rsatmp->n);
		/* create an EVP object: engine + rsa key */
		res = EVP_PKEY_new();
		EVP_PKEY_assign_RSA(res, rsatmp);
		break;
#endif

#ifndef OPENSSL_NO_DSA
	case 2:/*DSA*/
		/* set private/public external reference */
		dsatmp = DSA_new_method(e);
		DSA_set_ex_data(dsatmp,dsaHndidx,hptr);
		/*dsatmp->flags |= DSA_FLAG_EXT_PKEY;*/

		/* set public key*/
		dsatmp->pub_key = BN_new();
		dsatmp->p = BN_new();
		dsatmp->q = BN_new();
		dsatmp->g = BN_new();
		bn_expand2(dsatmp->pub_key, el/sizeof(BN_ULONG));
		bn_expand2(dsatmp->p, el/sizeof(BN_ULONG));
		bn_expand2(dsatmp->q, 20/sizeof(BN_ULONG));
		bn_expand2(dsatmp->g, el/sizeof(BN_ULONG));
		if (!dsatmp->pub_key || dsatmp->pub_key->dmax!=(int)(el/sizeof(BN_ULONG))|| 
			!dsatmp->p || dsatmp->p->dmax!=(int)(el/sizeof(BN_ULONG)) ||
			!dsatmp->q || dsatmp->q->dmax!=20/sizeof(BN_ULONG) ||
			!dsatmp->g || dsatmp->g->dmax!=(int)(el/sizeof(BN_ULONG)))
			goto err;

		ret=p_surewarehk_Load_Dsa_Pubkey(msg,key_id,el,
						 (unsigned long *)dsatmp->pub_key->d, 
						 (unsigned long *)dsatmp->p->d,
						 (unsigned long *)dsatmp->q->d,
						 (unsigned long *)dsatmp->g->d);
		surewarehk_error_handling(msg,SUREWARE_F_SUREWAREHK_LOAD_PUBLIC_KEY,ret);
		if (ret!=1)
		{
			SUREWAREerr(SUREWARE_F_SUREWAREHK_LOAD_PRIVATE_KEY,ENGINE_R_FAILED_LOADING_PUBLIC_KEY);
			goto err;
		}
		/* set parameters */
		/* normalise pubkey and parameters in case of */
		dsatmp->pub_key->top=el/sizeof(BN_ULONG);
		bn_fix_top(dsatmp->pub_key);
		dsatmp->p->top=el/sizeof(BN_ULONG);
		bn_fix_top(dsatmp->p);
		dsatmp->q->top=20/sizeof(BN_ULONG);
		bn_fix_top(dsatmp->q);
		dsatmp->g->top=el/sizeof(BN_ULONG);
		bn_fix_top(dsatmp->g);

		/* create an EVP object: engine + rsa key */
		res = EVP_PKEY_new();
		EVP_PKEY_assign_DSA(res, dsatmp);
		break;
#endif

	default:
		SUREWAREerr(SUREWARE_F_SUREWAREHK_LOAD_PRIVATE_KEY,ENGINE_R_FAILED_LOADING_PRIVATE_KEY);
		goto err;
	}
	return res;
 err:
	if (res)
		EVP_PKEY_free(res);
#ifndef OPENSSL_NO_RSA
	if (rsatmp)
		RSA_free(rsatmp);
#endif
#ifndef OPENSSL_NO_DSA
	if (dsatmp)
		DSA_free(dsatmp);
#endif
	return NULL;
}

static EVP_PKEY *surewarehk_load_privkey(ENGINE *e, const char *key_id,
					 UI_METHOD *ui_method, void *callback_data)
{
	EVP_PKEY *res = NULL;
	int ret=0;
	unsigned long el=0;
	char *hptr=NULL;
	char keytype=0;
	char msg[64]="ENGINE_load_privkey";

	if(!p_surewarehk_Load_Privkey)
	{
		SUREWAREerr(SUREWARE_F_SUREWAREHK_LOAD_PRIVATE_KEY,ENGINE_R_NOT_INITIALISED);
	}
	else
	{
		ret=p_surewarehk_Load_Privkey(msg,key_id,&hptr,&el,&keytype);
		if (ret!=1)
		{
			SUREWAREerr(SUREWARE_F_SUREWAREHK_LOAD_PRIVATE_KEY,ENGINE_R_FAILED_LOADING_PRIVATE_KEY);
			ERR_add_error_data(1,msg);		
		}
		else
			res=sureware_load_public(e,key_id,hptr,el,keytype);
	}
	return res;
}

static EVP_PKEY *surewarehk_load_pubkey(ENGINE *e, const char *key_id,
					 UI_METHOD *ui_method, void *callback_data)
{
	EVP_PKEY *res = NULL;
	int ret=0;
	unsigned long el=0;
	char *hptr=NULL;
	char keytype=0;
	char msg[64]="ENGINE_load_pubkey";

	if(!p_surewarehk_Info_Pubkey)
	{
		SUREWAREerr(SUREWARE_F_SUREWAREHK_LOAD_PUBLIC_KEY,ENGINE_R_NOT_INITIALISED);
	}
	else
	{
		/* call once to identify if DSA or RSA */
		ret=p_surewarehk_Info_Pubkey(msg,key_id,&el,&keytype);
		if (ret!=1)
		{
			SUREWAREerr(SUREWARE_F_SUREWAREHK_LOAD_PUBLIC_KEY,ENGINE_R_FAILED_LOADING_PUBLIC_KEY);
			ERR_add_error_data(1,msg);
		}
		else
			res=sureware_load_public(e,key_id,hptr,el,keytype);
	}
	return res;
}

/* This cleans up an RSA/DSA KM key(do not destroy the key into the hardware)
, called when ex_data is freed */
static void surewarehk_ex_free(void *obj, void *item, CRYPTO_EX_DATA *ad,
	int idx,long argl, void *argp)
{
	if(!p_surewarehk_Free)
	{
		SUREWAREerr(SUREWARE_F_SUREWAREHK_EX_FREE,ENGINE_R_NOT_INITIALISED);
	}
	else
		p_surewarehk_Free((char *)item,0);
}

#if 0
/* not currently used (bug?) */
/* This cleans up an DH KM key (destroys the key into hardware), 
called when ex_data is freed */
static void surewarehk_dh_ex_free(void *obj, void *item, CRYPTO_EX_DATA *ad,
	int idx,long argl, void *argp)
{
	if(!p_surewarehk_Free)
	{
		SUREWAREerr(SUREWARE_F_SUREWAREHK_EX_FREE,ENGINE_R_NOT_INITIALISED);
	}
	else
		p_surewarehk_Free((char *)item,1);
}
#endif

/*
* return number of decrypted bytes
*/
#ifndef OPENSSL_NO_RSA
static int surewarehk_rsa_priv_dec(int flen,const unsigned char *from,unsigned char *to,
			RSA *rsa,int padding)
{
	int ret=0,tlen;
	char *buf=NULL,*hptr=NULL;
	char msg[64]="ENGINE_rsa_priv_dec";
	if (!p_surewarehk_Rsa_Priv_Dec)
	{
		SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_PRIV_DEC,ENGINE_R_NOT_INITIALISED);
	}
	/* extract ref to private key */
	else if (!(hptr=RSA_get_ex_data(rsa, rsaHndidx)))
	{
		SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_PRIV_DEC,SUREWARE_R_MISSING_KEY_COMPONENTS);
		goto err;
	}
	/* analyse what padding we can do into the hardware */
	if (padding==RSA_PKCS1_PADDING)
	{
		/* do it one shot */
		ret=p_surewarehk_Rsa_Priv_Dec(msg,flen,(unsigned char *)from,&tlen,to,hptr,SUREWARE_PKCS1_PAD);
		surewarehk_error_handling(msg,SUREWARE_F_SUREWAREHK_RSA_PRIV_DEC,ret);
		if (ret!=1)
			goto err;
		ret=tlen;
	}
	else /* do with no padding into hardware */
	{
		ret=p_surewarehk_Rsa_Priv_Dec(msg,flen,(unsigned char *)from,&tlen,to,hptr,SUREWARE_NO_PAD);
		surewarehk_error_handling(msg,SUREWARE_F_SUREWAREHK_RSA_PRIV_DEC,ret);
		if (ret!=1)
			goto err;
		/* intermediate buffer for padding */
		if ((buf=OPENSSL_malloc(tlen)) == NULL)
		{
			RSAerr(SUREWARE_F_SUREWAREHK_RSA_PRIV_DEC,ERR_R_MALLOC_FAILURE);
			goto err;
		}
		memcpy(buf,to,tlen);/* transfert to into buf */
		switch (padding) /* check padding in software */
		{
#ifndef OPENSSL_NO_SHA
		case RSA_PKCS1_OAEP_PADDING:
			ret=RSA_padding_check_PKCS1_OAEP(to,tlen,(unsigned char *)buf,tlen,tlen,NULL,0);
			break;
#endif
 		case RSA_SSLV23_PADDING:
			ret=RSA_padding_check_SSLv23(to,tlen,(unsigned char *)buf,flen,tlen);
			break;
		case RSA_NO_PADDING:
			ret=RSA_padding_check_none(to,tlen,(unsigned char *)buf,flen,tlen);
			break;
		default:
			RSAerr(SUREWARE_F_SUREWAREHK_RSA_PRIV_DEC,RSA_R_UNKNOWN_PADDING_TYPE);
			goto err;
		}
		if (ret < 0)
			RSAerr(SUREWARE_F_SUREWAREHK_RSA_PRIV_DEC,RSA_R_PADDING_CHECK_FAILED);
	}
err:
	if (buf)
	{
		OPENSSL_cleanse(buf,tlen);
		OPENSSL_free(buf);
	}
	return ret;
}

/*
* Does what OpenSSL rsa_priv_enc does.
*/
static int surewarehk_rsa_sign(int flen,const unsigned char *from,unsigned char *to,
			    RSA *rsa,int padding)
{
	int ret=0,tlen;
	char *hptr=NULL;
	char msg[64]="ENGINE_rsa_sign";
	if (!p_surewarehk_Rsa_Sign)
	{
		SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_PRIV_ENC,ENGINE_R_NOT_INITIALISED);
	}
	/* extract ref to private key */
	else if (!(hptr=RSA_get_ex_data(rsa, rsaHndidx)))
	{
		SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_PRIV_ENC,SUREWARE_R_MISSING_KEY_COMPONENTS);
	}
	else
	{
		switch (padding)
		{
		case RSA_PKCS1_PADDING: /* do it in one shot */
			ret=p_surewarehk_Rsa_Sign(msg,flen,(unsigned char *)from,&tlen,to,hptr,SUREWARE_PKCS1_PAD);
			surewarehk_error_handling(msg,SUREWARE_F_SUREWAREHK_RSA_PRIV_ENC,ret);
			break;
		case RSA_NO_PADDING:
		default:
			RSAerr(SUREWARE_F_SUREWAREHK_RSA_PRIV_ENC,RSA_R_UNKNOWN_PADDING_TYPE);
		}
	}
	return ret==1 ? tlen : ret;
}

#endif

#ifndef OPENSSL_NO_DSA
/* DSA sign and verify */
static	DSA_SIG * surewarehk_dsa_do_sign(const unsigned char *from, int flen, DSA *dsa)
{
	int ret=0;
	char *hptr=NULL;
	DSA_SIG *psign=NULL;
	char msg[64]="ENGINE_dsa_do_sign";
	if (!p_surewarehk_Dsa_Sign)
	{
		SUREWAREerr(SUREWARE_F_SUREWAREHK_DSA_DO_SIGN,ENGINE_R_NOT_INITIALISED);
	}
	/* extract ref to private key */
	else if (!(hptr=DSA_get_ex_data(dsa, dsaHndidx)))
	{
		SUREWAREerr(SUREWARE_F_SUREWAREHK_DSA_DO_SIGN,SUREWARE_R_MISSING_KEY_COMPONENTS);
	}
	else
	{
		if((psign = DSA_SIG_new()) == NULL)
		{
			SUREWAREerr(SUREWARE_F_SUREWAREHK_DSA_DO_SIGN,ERR_R_MALLOC_FAILURE);
			goto err;
		}
		psign->r=BN_new();
		psign->s=BN_new();
		bn_expand2(psign->r, 20/sizeof(BN_ULONG));
		bn_expand2(psign->s, 20/sizeof(BN_ULONG));
		if (!psign->r || psign->r->dmax!=20/sizeof(BN_ULONG) ||
			!psign->s || psign->s->dmax!=20/sizeof(BN_ULONG))
			goto err;
		ret=p_surewarehk_Dsa_Sign(msg,flen,from,
					  (unsigned long *)psign->r->d,
					  (unsigned long *)psign->s->d,
					  hptr);
		surewarehk_error_handling(msg,SUREWARE_F_SUREWAREHK_DSA_DO_SIGN,ret);
	}
	psign->r->top=20/sizeof(BN_ULONG);
	bn_fix_top(psign->r);
	psign->s->top=20/sizeof(BN_ULONG);
	bn_fix_top(psign->s);

err:	
	if (psign)
	{
		DSA_SIG_free(psign);
		psign=NULL;
	}
	return psign;
}
#endif

static int surewarehk_modexp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
			     const BIGNUM *m, BN_CTX *ctx)
{
	int ret=0;
	char msg[64]="ENGINE_modexp";
	if (!p_surewarehk_Mod_Exp)
	{
		SUREWAREerr(SUREWARE_F_SUREWAREHK_MOD_EXP,ENGINE_R_NOT_INITIALISED);
	}
	else
	{
		bn_expand2(r,m->top);
		if (r && r->dmax==m->top)
		{
			/* do it*/
			ret=p_surewarehk_Mod_Exp(msg,
						 m->top*sizeof(BN_ULONG),
						 (unsigned long *)m->d,
						 p->top*sizeof(BN_ULONG),
						 (unsigned long *)p->d,
						 a->top*sizeof(BN_ULONG),
						 (unsigned long *)a->d,
						 (unsigned long *)r->d);
			surewarehk_error_handling(msg,SUREWARE_F_SUREWAREHK_MOD_EXP,ret);
			if (ret==1)
			{
				/* normalise result */
				r->top=m->top;
				bn_fix_top(r);
			}
		}
	}
	return ret;
}
#endif /* !OPENSSL_NO_HW_SureWare */
#endif /* !OPENSSL_NO_HW */