[thirdparty/openssl.git] / engines / e_nuron.c

/* crypto/engine/hw_nuron.c */
/*
 * Written by Ben Laurie for the OpenSSL Project, leaning heavily on Geoff
 * Thorpe's Atalla implementation.
 */
/* ====================================================================
 * Copyright (c) 2000-2001 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 <string.h>
#include <openssl/crypto.h>
#include <openssl/buffer.h>
#include <openssl/dso.h>
#include <openssl/engine.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
#include <openssl/bn.h>

#ifndef OPENSSL_NO_HW
# ifndef OPENSSL_NO_HW_NURON

#  define NURON_LIB_NAME "nuron engine"
#  include "e_nuron_err.c"

static const char *NURON_LIBNAME = NULL;
static const char *get_NURON_LIBNAME(void)
{
    if (NURON_LIBNAME)
        return NURON_LIBNAME;
    return "nuronssl";
}

static void free_NURON_LIBNAME(void)
{
    if (NURON_LIBNAME)
        OPENSSL_free((void *)NURON_LIBNAME);
    NURON_LIBNAME = NULL;
}

static long set_NURON_LIBNAME(const char *name)
{
    free_NURON_LIBNAME();
    return (((NURON_LIBNAME = BUF_strdup(name)) != NULL) ? 1 : 0);
}

static const char *NURON_F1 = "nuron_mod_exp";

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

typedef int tfnModExp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
                      const BIGNUM *m);
static tfnModExp *pfnModExp = NULL;

static DSO *pvDSOHandle = NULL;

static int nuron_destroy(ENGINE *e)
{
    free_NURON_LIBNAME();
    ERR_unload_NURON_strings();
    return 1;
}

static int nuron_init(ENGINE *e)
{
    if (pvDSOHandle != NULL) {
        NURONerr(NURON_F_NURON_INIT, NURON_R_ALREADY_LOADED);
        return 0;
    }

    pvDSOHandle = DSO_load(NULL, get_NURON_LIBNAME(), NULL,
                           DSO_FLAG_NAME_TRANSLATION_EXT_ONLY);
    if (!pvDSOHandle) {
        NURONerr(NURON_F_NURON_INIT, NURON_R_DSO_NOT_FOUND);
        return 0;
    }

    pfnModExp = (tfnModExp *) DSO_bind_func(pvDSOHandle, NURON_F1);
    if (!pfnModExp) {
        NURONerr(NURON_F_NURON_INIT, NURON_R_DSO_FUNCTION_NOT_FOUND);
        return 0;
    }

    return 1;
}

static int nuron_finish(ENGINE *e)
{
    free_NURON_LIBNAME();
    if (pvDSOHandle == NULL) {
        NURONerr(NURON_F_NURON_FINISH, NURON_R_NOT_LOADED);
        return 0;
    }
    if (!DSO_free(pvDSOHandle)) {
        NURONerr(NURON_F_NURON_FINISH, NURON_R_DSO_FAILURE);
        return 0;
    }
    pvDSOHandle = NULL;
    pfnModExp = NULL;
    return 1;
}

static int nuron_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f) (void))
{
    int initialised = ((pvDSOHandle == NULL) ? 0 : 1);
    switch (cmd) {
    case NURON_CMD_SO_PATH:
        if (p == NULL) {
            NURONerr(NURON_F_NURON_CTRL, ERR_R_PASSED_NULL_PARAMETER);
            return 0;
        }
        if (initialised) {
            NURONerr(NURON_F_NURON_CTRL, NURON_R_ALREADY_LOADED);
            return 0;
        }
        return set_NURON_LIBNAME((const char *)p);
    default:
        break;
    }
    NURONerr(NURON_F_NURON_CTRL, NURON_R_CTRL_COMMAND_NOT_IMPLEMENTED);
    return 0;
}

static int nuron_mod_exp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
                         const BIGNUM *m, BN_CTX *ctx)
{
    if (!pvDSOHandle) {
        NURONerr(NURON_F_NURON_MOD_EXP, NURON_R_NOT_LOADED);
        return 0;
    }
    return pfnModExp(r, a, p, m);
}

#  ifndef OPENSSL_NO_RSA
static int nuron_rsa_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa,
                             BN_CTX *ctx)
{
    return nuron_mod_exp(r0, I, rsa->d, rsa->n, ctx);
}
#  endif

#  ifndef OPENSSL_NO_DSA
/*
 * This code was liberated and adapted from the commented-out code in
 * dsa_ossl.c. Because of the unoptimised form of the Atalla acceleration (it
 * doesn't have a CRT form for RSA), this function means that an Atalla
 * system running with a DSA server certificate can handshake around 5 or 6
 * times faster/more than an equivalent system running with RSA. Just check
 * out the "signs" statistics from the RSA and DSA parts of "openssl speed
 * -engine atalla dsa1024 rsa1024".
 */
static int nuron_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 (!nuron_mod_exp(rr, a1, p1, m, ctx))
        goto end;
    /* let t = a2 ^ p2 mod m */
    if (!nuron_mod_exp(&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 int nuron_mod_exp_dsa(DSA *dsa, BIGNUM *r, BIGNUM *a,
                             const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx,
                             BN_MONT_CTX *m_ctx)
{
    return nuron_mod_exp(r, a, p, m, ctx);
}
#  endif

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

#  ifndef OPENSSL_NO_DH
/* This function is aliased to mod_exp (with the dh and mont dropped). */
static int nuron_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)
{
    return nuron_mod_exp(r, a, p, m, ctx);
}
#  endif

#  ifndef OPENSSL_NO_RSA
static RSA_METHOD nuron_rsa = {
    "Nuron RSA method",
    NULL,
    NULL,
    NULL,
    NULL,
    nuron_rsa_mod_exp,
    nuron_mod_exp_mont,
    NULL,
    NULL,
    0,
    NULL,
    NULL,
    NULL,
    NULL
};
#  endif

#  ifndef OPENSSL_NO_DSA
static DSA_METHOD nuron_dsa = {
    "Nuron DSA method",
    NULL,                       /* dsa_do_sign */
    NULL,                       /* dsa_sign_setup */
    NULL,                       /* dsa_do_verify */
    nuron_dsa_mod_exp,          /* dsa_mod_exp */
    nuron_mod_exp_dsa,          /* bn_mod_exp */
    NULL,                       /* init */
    NULL,                       /* finish */
    0,                          /* flags */
    NULL,                       /* app_data */
    NULL,                       /* dsa_paramgen */
    NULL                        /* dsa_keygen */
};
#  endif

#  ifndef OPENSSL_NO_DH
static DH_METHOD nuron_dh = {
    "Nuron DH method",
    NULL,
    NULL,
    nuron_mod_exp_dh,
    NULL,
    NULL,
    0,
    NULL,
    NULL
};
#  endif

/* Constants used when creating the ENGINE */
static const char *engine_nuron_id = "nuron";
static const char *engine_nuron_name = "Nuron hardware engine support";

/*
 * This internal function is used by ENGINE_nuron() and possibly by the
 * "dynamic" ENGINE support too
 */
static int bind_helper(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_nuron_id) ||
        !ENGINE_set_name(e, engine_nuron_name) ||
#  ifndef OPENSSL_NO_RSA
        !ENGINE_set_RSA(e, &nuron_rsa) ||
#  endif
#  ifndef OPENSSL_NO_DSA
        !ENGINE_set_DSA(e, &nuron_dsa) ||
#  endif
#  ifndef OPENSSL_NO_DH
        !ENGINE_set_DH(e, &nuron_dh) ||
#  endif
        !ENGINE_set_destroy_function(e, nuron_destroy) ||
        !ENGINE_set_init_function(e, nuron_init) ||
        !ENGINE_set_finish_function(e, nuron_finish) ||
        !ENGINE_set_ctrl_function(e, nuron_ctrl) ||
        !ENGINE_set_cmd_defns(e, nuron_cmd_defns))
        return 0;

#  ifndef OPENSSL_NO_RSA
    /*
     * We know that the "PKCS1_SSLeay()" functions hook properly to the
     * nuron-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();
    nuron_rsa.rsa_pub_enc = meth1->rsa_pub_enc;
    nuron_rsa.rsa_pub_dec = meth1->rsa_pub_dec;
    nuron_rsa.rsa_priv_enc = meth1->rsa_priv_enc;
    nuron_rsa.rsa_priv_dec = meth1->rsa_priv_dec;
#  endif

#  ifndef OPENSSL_NO_DSA
    /*
     * Use the DSA_OpenSSL() method and just hook the mod_exp-ish bits.
     */
    meth2 = DSA_OpenSSL();
    nuron_dsa.dsa_do_sign = meth2->dsa_do_sign;
    nuron_dsa.dsa_sign_setup = meth2->dsa_sign_setup;
    nuron_dsa.dsa_do_verify = meth2->dsa_do_verify;
#  endif

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

    /* Ensure the nuron error handling is set up */
    ERR_load_NURON_strings();
    return 1;
}

#  ifdef OPENSSL_NO_DYNAMIC_ENGINE
static ENGINE *engine_nuron(void)
{
    ENGINE *ret = ENGINE_new();
    if (!ret)
        return NULL;
    if (!bind_helper(ret)) {
        ENGINE_free(ret);
        return NULL;
    }
    return ret;
}

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

/*
 * This stuff is needed if this ENGINE is being compiled into a
 * self-contained shared-library.
 */
#  ifndef OPENSSL_NO_DYNAMIC_ENGINE
static int bind_fn(ENGINE *e, const char *id)
{
    if (id && (strcmp(id, engine_nuron_id) != 0))
        return 0;
    if (!bind_helper(e))
        return 0;
    return 1;
}

IMPLEMENT_DYNAMIC_CHECK_FN()
    IMPLEMENT_DYNAMIC_BIND_FN(bind_fn)
#  endif                        /* OPENSSL_NO_DYNAMIC_ENGINE */
# endif                         /* !OPENSSL_NO_HW_NURON */
#endif                          /* !OPENSSL_NO_HW */
Commit	Line	Data
5572f482	1	/* crypto/engine/hw_nuron.c */
40720ce3 MC	2	/*
40720ce3 MC	3	* Written by Ben Laurie for the OpenSSL Project, leaning heavily on Geoff
5572f482 RL	4	* Thorpe's Atalla implementation.
	5	*/
	6	/* ====================================================================
	7	* Copyright (c) 2000-2001 The OpenSSL Project. All rights reserved.
	8	*
	9	* Redistribution and use in source and binary forms, with or without
	10	* modification, are permitted provided that the following conditions
	11	* are met:
	12	*
	13	* 1. Redistributions of source code must retain the above copyright
40720ce3	14	* notice, this list of conditions and the following disclaimer.
5572f482 RL	15	*
	16	* 2. Redistributions in binary form must reproduce the above copyright
	17	* notice, this list of conditions and the following disclaimer in
	18	* the documentation and/or other materials provided with the
	19	* distribution.
	20	*
	21	* 3. All advertising materials mentioning features or use of this
	22	* software must display the following acknowledgment:
	23	* "This product includes software developed by the OpenSSL Project
	24	* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
	25	*
	26	* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
	27	* endorse or promote products derived from this software without
	28	* prior written permission. For written permission, please contact
	29	* licensing@OpenSSL.org.
	30	*
	31	* 5. Products derived from this software may not be called "OpenSSL"
	32	* nor may "OpenSSL" appear in their names without prior written
	33	* permission of the OpenSSL Project.
	34	*
	35	* 6. Redistributions of any form whatsoever must retain the following
	36	* acknowledgment:
	37	* "This product includes software developed by the OpenSSL Project
	38	* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
	39	*
	40	* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
	41	* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	42	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	43	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
	44	* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	45	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	46	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	47	* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	48	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	49	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	50	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
	51	* OF THE POSSIBILITY OF SUCH DAMAGE.
	52	* ====================================================================
	53	*
	54	* This product includes cryptographic software written by Eric Young
	55	* (eay@cryptsoft.com). This product includes software written by Tim
	56	* Hudson (tjh@cryptsoft.com).
	57	*
	58	*/
	59
	60	#include <stdio.h>
b76d66fb	61	#include <string.h>
5572f482	62	#include <openssl/crypto.h>
665dc392	63	#include <openssl/buffer.h>
5572f482 RL	64	#include <openssl/dso.h>
5572f482 RL	65	#include <openssl/engine.h>
4913b88f	66	#ifndef OPENSSL_NO_RSA
40720ce3	67	# include <openssl/rsa.h>
4913b88f NL	68	#endif
4913b88f NL	69	#ifndef OPENSSL_NO_DSA
40720ce3	70	# include <openssl/dsa.h>
4913b88f NL	71	#endif
4913b88f NL	72	#ifndef OPENSSL_NO_DH
40720ce3	73	# include <openssl/dh.h>
4913b88f	74	#endif
f15390bd	75	#include <openssl/bn.h>
5572f482 RL	76
5572f482 RL	77	#ifndef OPENSSL_NO_HW
40720ce3	78	# ifndef OPENSSL_NO_HW_NURON
5572f482	79
40720ce3 MC	80	# define NURON_LIB_NAME "nuron engine"
40720ce3 MC	81	# include "e_nuron_err.c"
5572f482 RL	82
	83	static const char *NURON_LIBNAME = NULL;
	84	static const char *get_NURON_LIBNAME(void)
40720ce3 MC	85	{
	86	if (NURON_LIBNAME)
	87	return NURON_LIBNAME;
	88	return "nuronssl";
	89	}
	90
5572f482	91	static void free_NURON_LIBNAME(void)
40720ce3 MC	92	{
	93	if (NURON_LIBNAME)
	94	OPENSSL_free((void *)NURON_LIBNAME);
	95	NURON_LIBNAME = NULL;
	96	}
	97
5572f482	98	static long set_NURON_LIBNAME(const char *name)
40720ce3 MC	99	{
	100	free_NURON_LIBNAME();
	101	return (((NURON_LIBNAME = BUF_strdup(name)) != NULL) ? 1 : 0);
	102	}
	103
5572f482 RL	104	static const char *NURON_F1 = "nuron_mod_exp";
	105
	106	/* The definitions for control commands specific to this engine */
40720ce3	107	# define NURON_CMD_SO_PATH ENGINE_CMD_BASE
5572f482	108	static const ENGINE_CMD_DEFN nuron_cmd_defns[] = {
40720ce3 MC	109	{NURON_CMD_SO_PATH,
	110	"SO_PATH",
	111	"Specifies the path to the 'nuronssl' shared library",
	112	ENGINE_CMD_FLAG_STRING},
	113	{0, NULL, NULL, 0}
	114	};
	115
	116	typedef int tfnModExp(BIGNUM r, const BIGNUM a, const BIGNUM *p,
	117	const BIGNUM *m);
5572f482 RL	118	static tfnModExp *pfnModExp = NULL;
	119
	120	static DSO *pvDSOHandle = NULL;
	121
	122	static int nuron_destroy(ENGINE *e)
40720ce3 MC	123	{
	124	free_NURON_LIBNAME();
	125	ERR_unload_NURON_strings();
	126	return 1;
	127	}
5572f482 RL	128
5572f482 RL	129	static int nuron_init(ENGINE *e)
40720ce3 MC	130	{
	131	if (pvDSOHandle != NULL) {
	132	NURONerr(NURON_F_NURON_INIT, NURON_R_ALREADY_LOADED);
	133	return 0;
	134	}
	135
	136	pvDSOHandle = DSO_load(NULL, get_NURON_LIBNAME(), NULL,
	137	DSO_FLAG_NAME_TRANSLATION_EXT_ONLY);
	138	if (!pvDSOHandle) {
	139	NURONerr(NURON_F_NURON_INIT, NURON_R_DSO_NOT_FOUND);
	140	return 0;
	141	}
	142
	143	pfnModExp = (tfnModExp *) DSO_bind_func(pvDSOHandle, NURON_F1);
	144	if (!pfnModExp) {
	145	NURONerr(NURON_F_NURON_INIT, NURON_R_DSO_FUNCTION_NOT_FOUND);
	146	return 0;
	147	}
	148
	149	return 1;
	150	}
5572f482 RL	151
5572f482 RL	152	static int nuron_finish(ENGINE *e)
40720ce3 MC	153	{
	154	free_NURON_LIBNAME();
	155	if (pvDSOHandle == NULL) {
	156	NURONerr(NURON_F_NURON_FINISH, NURON_R_NOT_LOADED);
	157	return 0;
	158	}
	159	if (!DSO_free(pvDSOHandle)) {
	160	NURONerr(NURON_F_NURON_FINISH, NURON_R_DSO_FAILURE);
	161	return 0;
	162	}
	163	pvDSOHandle = NULL;
	164	pfnModExp = NULL;
	165	return 1;
5572f482 RL	166	}
5572f482 RL	167
40720ce3 MC	168	static int nuron_ctrl(ENGINE e, int cmd, long i, void p, void (*f) (void))
	169	{
	170	int initialised = ((pvDSOHandle == NULL) ? 0 : 1);
	171	switch (cmd) {
	172	case NURON_CMD_SO_PATH:
	173	if (p == NULL) {
	174	NURONerr(NURON_F_NURON_CTRL, ERR_R_PASSED_NULL_PARAMETER);
	175	return 0;
	176	}
	177	if (initialised) {
	178	NURONerr(NURON_F_NURON_CTRL, NURON_R_ALREADY_LOADED);
	179	return 0;
	180	}
	181	return set_NURON_LIBNAME((const char *)p);
	182	default:
	183	break;
	184	}
	185	NURONerr(NURON_F_NURON_CTRL, NURON_R_CTRL_COMMAND_NOT_IMPLEMENTED);
	186	return 0;
	187	}
5572f482	188
40720ce3 MC	189	static int nuron_mod_exp(BIGNUM r, const BIGNUM a, const BIGNUM *p,
	190	const BIGNUM m, BN_CTX ctx)
	191	{
	192	if (!pvDSOHandle) {
	193	NURONerr(NURON_F_NURON_MOD_EXP, NURON_R_NOT_LOADED);
	194	return 0;
	195	}
	196	return pfnModExp(r, a, p, m);
	197	}
5572f482	198
40720ce3 MC	199	# ifndef OPENSSL_NO_RSA
	200	static int nuron_rsa_mod_exp(BIGNUM r0, const BIGNUM I, RSA *rsa,
	201	BN_CTX *ctx)
	202	{
	203	return nuron_mod_exp(r0, I, rsa->d, rsa->n, ctx);
	204	}
	205	# endif
	206
	207	# ifndef OPENSSL_NO_DSA
	208	/*
	209	* This code was liberated and adapted from the commented-out code in
	210	* dsa_ossl.c. Because of the unoptimised form of the Atalla acceleration (it
	211	* doesn't have a CRT form for RSA), this function means that an Atalla
	212	* system running with a DSA server certificate can handshake around 5 or 6
	213	* times faster/more than an equivalent system running with RSA. Just check
	214	* out the "signs" statistics from the RSA and DSA parts of "openssl speed
	215	* -engine atalla dsa1024 rsa1024".
	216	*/
5572f482	217	static int nuron_dsa_mod_exp(DSA dsa, BIGNUM rr, BIGNUM *a1,
40720ce3 MC	218	BIGNUM p1, BIGNUM a2, BIGNUM p2, BIGNUM m,
	219	BN_CTX ctx, BN_MONT_CTX in_mont)
	220	{
	221	BIGNUM t;
	222	int to_return = 0;
	223
	224	BN_init(&t);
	225	/* let rr = a1 ^ p1 mod m */
	226	if (!nuron_mod_exp(rr, a1, p1, m, ctx))
	227	goto end;
	228	/* let t = a2 ^ p2 mod m */
	229	if (!nuron_mod_exp(&t, a2, p2, m, ctx))
	230	goto end;
	231	/* let rr = rr * t mod m */
	232	if (!BN_mod_mul(rr, rr, &t, m, ctx))
	233	goto end;
	234	to_return = 1;
	235	end:
	236	BN_free(&t);
	237	return to_return;
	238	}
5572f482 RL	239
5572f482 RL	240	static int nuron_mod_exp_dsa(DSA dsa, BIGNUM r, BIGNUM *a,
40720ce3 MC	241	const BIGNUM p, const BIGNUM m, BN_CTX *ctx,
	242	BN_MONT_CTX *m_ctx)
	243	{
	244	return nuron_mod_exp(r, a, p, m, ctx);
	245	}
	246	# endif
5572f482 RL	247
5572f482 RL	248	/* This function is aliased to mod_exp (with the mont stuff dropped). */
40720ce3	249	# ifndef OPENSSL_NO_RSA
5572f482	250	static int nuron_mod_exp_mont(BIGNUM r, const BIGNUM a, const BIGNUM *p,
40720ce3 MC	251	const BIGNUM m, BN_CTX ctx,
	252	BN_MONT_CTX *m_ctx)
	253	{
	254	return nuron_mod_exp(r, a, p, m, ctx);
	255	}
	256	# endif
5572f482	257
40720ce3	258	# ifndef OPENSSL_NO_DH
5572f482 RL	259	/* This function is aliased to mod_exp (with the dh and mont dropped). */
5572f482 RL	260	static int nuron_mod_exp_dh(const DH dh, BIGNUM r,
40720ce3 MC	261	const BIGNUM a, const BIGNUM p,
	262	const BIGNUM m, BN_CTX ctx, BN_MONT_CTX *m_ctx)
	263	{
	264	return nuron_mod_exp(r, a, p, m, ctx);
	265	}
	266	# endif
	267
	268	# ifndef OPENSSL_NO_RSA
	269	static RSA_METHOD nuron_rsa = {
	270	"Nuron RSA method",
	271	NULL,
	272	NULL,
	273	NULL,
	274	NULL,
	275	nuron_rsa_mod_exp,
	276	nuron_mod_exp_mont,
	277	NULL,
	278	NULL,
	279	0,
	280	NULL,
	281	NULL,
	282	NULL,
	283	NULL
	284	};
	285	# endif
	286
	287	# ifndef OPENSSL_NO_DSA
	288	static DSA_METHOD nuron_dsa = {
	289	"Nuron DSA method",
	290	NULL, /* dsa_do_sign */
	291	NULL, /* dsa_sign_setup */
	292	NULL, /* dsa_do_verify */
	293	nuron_dsa_mod_exp, /* dsa_mod_exp */
	294	nuron_mod_exp_dsa, /* bn_mod_exp */
	295	NULL, /* init */
	296	NULL, /* finish */
	297	0, /* flags */
	298	NULL, /* app_data */
	299	NULL, /* dsa_paramgen */
	300	NULL /* dsa_keygen */
	301	};
	302	# endif
	303
	304	# ifndef OPENSSL_NO_DH
	305	static DH_METHOD nuron_dh = {
	306	"Nuron DH method",
	307	NULL,
	308	NULL,
	309	nuron_mod_exp_dh,
	310	NULL,
	311	NULL,
	312	0,
	313	NULL,
	314	NULL
	315	};
	316	# endif
5572f482 RL	317
	318	/* Constants used when creating the ENGINE */
	319	static const char *engine_nuron_id = "nuron";
	320	static const char *engine_nuron_name = "Nuron hardware engine support";
	321
40720ce3 MC	322	/*
	323	* This internal function is used by ENGINE_nuron() and possibly by the
	324	* "dynamic" ENGINE support too
	325	*/
5572f482	326	static int bind_helper(ENGINE *e)
40720ce3 MC	327	{
	328	# ifndef OPENSSL_NO_RSA
	329	const RSA_METHOD *meth1;
	330	# endif
	331	# ifndef OPENSSL_NO_DSA
	332	const DSA_METHOD *meth2;
	333	# endif
	334	# ifndef OPENSSL_NO_DH
	335	const DH_METHOD *meth3;
	336	# endif
	337	if (!ENGINE_set_id(e, engine_nuron_id) \|\|
	338	!ENGINE_set_name(e, engine_nuron_name) \|\|
	339	# ifndef OPENSSL_NO_RSA
	340	!ENGINE_set_RSA(e, &nuron_rsa) \|\|
	341	# endif
	342	# ifndef OPENSSL_NO_DSA
	343	!ENGINE_set_DSA(e, &nuron_dsa) \|\|
	344	# endif
	345	# ifndef OPENSSL_NO_DH
	346	!ENGINE_set_DH(e, &nuron_dh) \|\|
	347	# endif
	348	!ENGINE_set_destroy_function(e, nuron_destroy) \|\|
	349	!ENGINE_set_init_function(e, nuron_init) \|\|
	350	!ENGINE_set_finish_function(e, nuron_finish) \|\|
	351	!ENGINE_set_ctrl_function(e, nuron_ctrl) \|\|
	352	!ENGINE_set_cmd_defns(e, nuron_cmd_defns))
	353	return 0;
	354
	355	# ifndef OPENSSL_NO_RSA
	356	/*
	357	* We know that the "PKCS1_SSLeay()" functions hook properly to the
	358	* nuron-specific mod_exp and mod_exp_crt so we use those functions. NB:
	359	* We don't use ENGINE_openssl() or anything "more generic" because
	360	* something like the RSAref code may not hook properly, and if you own
	361	* one of these cards then you have the right to do RSA operations on it
	362	* anyway!
	363	*/
	364	meth1 = RSA_PKCS1_SSLeay();
	365	nuron_rsa.rsa_pub_enc = meth1->rsa_pub_enc;
	366	nuron_rsa.rsa_pub_dec = meth1->rsa_pub_dec;
	367	nuron_rsa.rsa_priv_enc = meth1->rsa_priv_enc;
	368	nuron_rsa.rsa_priv_dec = meth1->rsa_priv_dec;
	369	# endif
	370
	371	# ifndef OPENSSL_NO_DSA
	372	/*
	373	* Use the DSA_OpenSSL() method and just hook the mod_exp-ish bits.
	374	*/
	375	meth2 = DSA_OpenSSL();
	376	nuron_dsa.dsa_do_sign = meth2->dsa_do_sign;
	377	nuron_dsa.dsa_sign_setup = meth2->dsa_sign_setup;
	378	nuron_dsa.dsa_do_verify = meth2->dsa_do_verify;
	379	# endif
	380
	381	# ifndef OPENSSL_NO_DH
	382	/* Much the same for Diffie-Hellman */
	383	meth3 = DH_OpenSSL();
	384	nuron_dh.generate_key = meth3->generate_key;
	385	nuron_dh.compute_key = meth3->compute_key;
	386	# endif
	387
	388	/* Ensure the nuron error handling is set up */
	389	ERR_load_NURON_strings();
	390	return 1;
391	}
5572f482	392
40720ce3	393	# ifdef OPENSSL_NO_DYNAMIC_ENGINE
5572f482	394	static ENGINE *engine_nuron(void)
40720ce3 MC	395	{
	396	ENGINE *ret = ENGINE_new();
	397	if (!ret)
	398	return NULL;
	399	if (!bind_helper(ret)) {
	400	ENGINE_free(ret);
	401	return NULL;
	402	}
	403	return ret;
	404	}
5572f482 RL	405
5572f482 RL	406	void ENGINE_load_nuron(void)
40720ce3 MC	407	{
	408	/* Copied from eng_[openssl\|dyn].c */
	409	ENGINE *toadd = engine_nuron();
	410	if (!toadd)
	411	return;
	412	ENGINE_add(toadd);
	413	ENGINE_free(toadd);
	414	ERR_clear_error();
	415	}
	416	# endif
5572f482	417
40720ce3 MC	418	/*
	419	* This stuff is needed if this ENGINE is being compiled into a
	420	* self-contained shared-library.
	421	*/
	422	# ifndef OPENSSL_NO_DYNAMIC_ENGINE
5572f482	423	static int bind_fn(ENGINE e, const char id)
40720ce3 MC	424	{
	425	if (id && (strcmp(id, engine_nuron_id) != 0))
	426	return 0;
	427	if (!bind_helper(e))
	428	return 0;
	429	return 1;
	430	}
5572f482	431
40720ce3 MC	432	IMPLEMENT_DYNAMIC_CHECK_FN()
	433	IMPLEMENT_DYNAMIC_BIND_FN(bind_fn)
	434	# endif /* OPENSSL_NO_DYNAMIC_ENGINE */
	435	# endif /* !OPENSSL_NO_HW_NURON */
	436	#endif /* !OPENSSL_NO_HW */