[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)
{
    OPENSSL_free(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 */
0f113f3e MC	2	/*
0f113f3e 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
0f113f3e	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>
3eeaab4b	66	#ifndef OPENSSL_NO_RSA
0f113f3e	67	# include <openssl/rsa.h>
3eeaab4b NL	68	#endif
3eeaab4b NL	69	#ifndef OPENSSL_NO_DSA
0f113f3e	70	# include <openssl/dsa.h>
3eeaab4b NL	71	#endif
3eeaab4b NL	72	#ifndef OPENSSL_NO_DH
0f113f3e	73	# include <openssl/dh.h>
3eeaab4b	74	#endif
f15390bd	75	#include <openssl/bn.h>
5572f482 RL	76
5572f482 RL	77	#ifndef OPENSSL_NO_HW
0f113f3e	78	# ifndef OPENSSL_NO_HW_NURON
5572f482	79
0f113f3e MC	80	# define NURON_LIB_NAME "nuron engine"
0f113f3e 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)
0f113f3e MC	85	{
	86	if (NURON_LIBNAME)
	87	return NURON_LIBNAME;
	88	return "nuronssl";
	89	}
	90
5572f482	91	static void free_NURON_LIBNAME(void)
0f113f3e	92	{
b548a1f1	93	OPENSSL_free(NURON_LIBNAME);
0f113f3e MC	94	NURON_LIBNAME = NULL;
	95	}
	96
5572f482	97	static long set_NURON_LIBNAME(const char *name)
0f113f3e MC	98	{
	99	free_NURON_LIBNAME();
	100	return (((NURON_LIBNAME = BUF_strdup(name)) != NULL) ? 1 : 0);
	101	}
	102
5572f482 RL	103	static const char *NURON_F1 = "nuron_mod_exp";
	104
	105	/* The definitions for control commands specific to this engine */
0f113f3e	106	# define NURON_CMD_SO_PATH ENGINE_CMD_BASE
5572f482	107	static const ENGINE_CMD_DEFN nuron_cmd_defns[] = {
0f113f3e MC	108	{NURON_CMD_SO_PATH,
	109	"SO_PATH",
	110	"Specifies the path to the 'nuronssl' shared library",
	111	ENGINE_CMD_FLAG_STRING},
	112	{0, NULL, NULL, 0}
	113	};
	114
	115	typedef int tfnModExp(BIGNUM r, const BIGNUM a, const BIGNUM *p,
	116	const BIGNUM *m);
5572f482 RL	117	static tfnModExp *pfnModExp = NULL;
	118
	119	static DSO *pvDSOHandle = NULL;
	120
	121	static int nuron_destroy(ENGINE *e)
0f113f3e MC	122	{
	123	free_NURON_LIBNAME();
	124	ERR_unload_NURON_strings();
	125	return 1;
	126	}
5572f482 RL	127
5572f482 RL	128	static int nuron_init(ENGINE *e)
0f113f3e MC	129	{
	130	if (pvDSOHandle != NULL) {
	131	NURONerr(NURON_F_NURON_INIT, NURON_R_ALREADY_LOADED);
	132	return 0;
	133	}
	134
	135	pvDSOHandle = DSO_load(NULL, get_NURON_LIBNAME(), NULL,
	136	DSO_FLAG_NAME_TRANSLATION_EXT_ONLY);
	137	if (!pvDSOHandle) {
	138	NURONerr(NURON_F_NURON_INIT, NURON_R_DSO_NOT_FOUND);
	139	return 0;
	140	}
	141
	142	pfnModExp = (tfnModExp *) DSO_bind_func(pvDSOHandle, NURON_F1);
	143	if (!pfnModExp) {
	144	NURONerr(NURON_F_NURON_INIT, NURON_R_DSO_FUNCTION_NOT_FOUND);
	145	return 0;
	146	}
	147
	148	return 1;
	149	}
5572f482 RL	150
5572f482 RL	151	static int nuron_finish(ENGINE *e)
0f113f3e MC	152	{
	153	free_NURON_LIBNAME();
	154	if (pvDSOHandle == NULL) {
	155	NURONerr(NURON_F_NURON_FINISH, NURON_R_NOT_LOADED);
	156	return 0;
	157	}
	158	if (!DSO_free(pvDSOHandle)) {
	159	NURONerr(NURON_F_NURON_FINISH, NURON_R_DSO_FAILURE);
	160	return 0;
	161	}
	162	pvDSOHandle = NULL;
	163	pfnModExp = NULL;
	164	return 1;
5572f482 RL	165	}
5572f482 RL	166
0f113f3e MC	167	static int nuron_ctrl(ENGINE e, int cmd, long i, void p, void (*f) (void))
	168	{
	169	int initialised = ((pvDSOHandle == NULL) ? 0 : 1);
	170	switch (cmd) {
	171	case NURON_CMD_SO_PATH:
	172	if (p == NULL) {
	173	NURONerr(NURON_F_NURON_CTRL, ERR_R_PASSED_NULL_PARAMETER);
	174	return 0;
	175	}
	176	if (initialised) {
	177	NURONerr(NURON_F_NURON_CTRL, NURON_R_ALREADY_LOADED);
	178	return 0;
	179	}
	180	return set_NURON_LIBNAME((const char *)p);
	181	default:
	182	break;
	183	}
	184	NURONerr(NURON_F_NURON_CTRL, NURON_R_CTRL_COMMAND_NOT_IMPLEMENTED);
	185	return 0;
	186	}
5572f482	187
0f113f3e MC	188	static int nuron_mod_exp(BIGNUM r, const BIGNUM a, const BIGNUM *p,
	189	const BIGNUM m, BN_CTX ctx)
	190	{
	191	if (!pvDSOHandle) {
	192	NURONerr(NURON_F_NURON_MOD_EXP, NURON_R_NOT_LOADED);
	193	return 0;
	194	}
	195	return pfnModExp(r, a, p, m);
	196	}
5572f482	197
0f113f3e MC	198	# ifndef OPENSSL_NO_RSA
	199	static int nuron_rsa_mod_exp(BIGNUM r0, const BIGNUM I, RSA *rsa,
	200	BN_CTX *ctx)
	201	{
	202	return nuron_mod_exp(r0, I, rsa->d, rsa->n, ctx);
	203	}
	204	# endif
	205
	206	# ifndef OPENSSL_NO_DSA
	207	/*
	208	* This code was liberated and adapted from the commented-out code in
	209	* dsa_ossl.c. Because of the unoptimised form of the Atalla acceleration (it
	210	* doesn't have a CRT form for RSA), this function means that an Atalla
	211	* system running with a DSA server certificate can handshake around 5 or 6
	212	* times faster/more than an equivalent system running with RSA. Just check
	213	* out the "signs" statistics from the RSA and DSA parts of "openssl speed
	214	* -engine atalla dsa1024 rsa1024".
	215	*/
5572f482	216	static int nuron_dsa_mod_exp(DSA dsa, BIGNUM rr, BIGNUM *a1,
0f113f3e MC	217	BIGNUM p1, BIGNUM a2, BIGNUM p2, BIGNUM m,
	218	BN_CTX ctx, BN_MONT_CTX in_mont)
	219	{
	220	BIGNUM t;
	221	int to_return = 0;
	222
	223	BN_init(&t);
	224	/* let rr = a1 ^ p1 mod m */
	225	if (!nuron_mod_exp(rr, a1, p1, m, ctx))
	226	goto end;
	227	/* let t = a2 ^ p2 mod m */
	228	if (!nuron_mod_exp(&t, a2, p2, m, ctx))
	229	goto end;
	230	/* let rr = rr * t mod m */
	231	if (!BN_mod_mul(rr, rr, &t, m, ctx))
	232	goto end;
	233	to_return = 1;
	234	end:
	235	BN_free(&t);
	236	return to_return;
	237	}
5572f482 RL	238
5572f482 RL	239	static int nuron_mod_exp_dsa(DSA dsa, BIGNUM r, BIGNUM *a,
0f113f3e MC	240	const BIGNUM p, const BIGNUM m, BN_CTX *ctx,
	241	BN_MONT_CTX *m_ctx)
	242	{
	243	return nuron_mod_exp(r, a, p, m, ctx);
	244	}
	245	# endif
5572f482 RL	246
5572f482 RL	247	/* This function is aliased to mod_exp (with the mont stuff dropped). */
0f113f3e	248	# ifndef OPENSSL_NO_RSA
5572f482	249	static int nuron_mod_exp_mont(BIGNUM r, const BIGNUM a, const BIGNUM *p,
0f113f3e MC	250	const BIGNUM m, BN_CTX ctx,
	251	BN_MONT_CTX *m_ctx)
	252	{
	253	return nuron_mod_exp(r, a, p, m, ctx);
	254	}
	255	# endif
5572f482	256
0f113f3e	257	# ifndef OPENSSL_NO_DH
5572f482 RL	258	/* This function is aliased to mod_exp (with the dh and mont dropped). */
5572f482 RL	259	static int nuron_mod_exp_dh(const DH dh, BIGNUM r,
0f113f3e MC	260	const BIGNUM a, const BIGNUM p,
	261	const BIGNUM m, BN_CTX ctx, BN_MONT_CTX *m_ctx)
	262	{
	263	return nuron_mod_exp(r, a, p, m, ctx);
	264	}
	265	# endif
	266
	267	# ifndef OPENSSL_NO_RSA
	268	static RSA_METHOD nuron_rsa = {
	269	"Nuron RSA method",
	270	NULL,
	271	NULL,
	272	NULL,
	273	NULL,
	274	nuron_rsa_mod_exp,
	275	nuron_mod_exp_mont,
	276	NULL,
	277	NULL,
	278	0,
	279	NULL,
	280	NULL,
	281	NULL,
	282	NULL
	283	};
	284	# endif
	285
	286	# ifndef OPENSSL_NO_DSA
	287	static DSA_METHOD nuron_dsa = {
	288	"Nuron DSA method",
	289	NULL, /* dsa_do_sign */
	290	NULL, /* dsa_sign_setup */
	291	NULL, /* dsa_do_verify */
	292	nuron_dsa_mod_exp, /* dsa_mod_exp */
	293	nuron_mod_exp_dsa, /* bn_mod_exp */
	294	NULL, /* init */
	295	NULL, /* finish */
	296	0, /* flags */
	297	NULL, /* app_data */
	298	NULL, /* dsa_paramgen */
	299	NULL /* dsa_keygen */
	300	};
	301	# endif
	302
	303	# ifndef OPENSSL_NO_DH
	304	static DH_METHOD nuron_dh = {
	305	"Nuron DH method",
	306	NULL,
	307	NULL,
	308	nuron_mod_exp_dh,
	309	NULL,
	310	NULL,
	311	0,
	312	NULL,
	313	NULL
	314	};
	315	# endif
5572f482 RL	316
	317	/* Constants used when creating the ENGINE */
	318	static const char *engine_nuron_id = "nuron";
	319	static const char *engine_nuron_name = "Nuron hardware engine support";
	320
0f113f3e MC	321	/*
	322	* This internal function is used by ENGINE_nuron() and possibly by the
	323	* "dynamic" ENGINE support too
	324	*/
5572f482	325	static int bind_helper(ENGINE *e)
0f113f3e MC	326	{
	327	# ifndef OPENSSL_NO_RSA
	328	const RSA_METHOD *meth1;
	329	# endif
	330	# ifndef OPENSSL_NO_DSA
	331	const DSA_METHOD *meth2;
	332	# endif
	333	# ifndef OPENSSL_NO_DH
	334	const DH_METHOD *meth3;
	335	# endif
	336	if (!ENGINE_set_id(e, engine_nuron_id) \|\|
	337	!ENGINE_set_name(e, engine_nuron_name) \|\|
	338	# ifndef OPENSSL_NO_RSA
	339	!ENGINE_set_RSA(e, &nuron_rsa) \|\|
	340	# endif
	341	# ifndef OPENSSL_NO_DSA
	342	!ENGINE_set_DSA(e, &nuron_dsa) \|\|
	343	# endif
	344	# ifndef OPENSSL_NO_DH
	345	!ENGINE_set_DH(e, &nuron_dh) \|\|
	346	# endif
	347	!ENGINE_set_destroy_function(e, nuron_destroy) \|\|
	348	!ENGINE_set_init_function(e, nuron_init) \|\|
	349	!ENGINE_set_finish_function(e, nuron_finish) \|\|
	350	!ENGINE_set_ctrl_function(e, nuron_ctrl) \|\|
	351	!ENGINE_set_cmd_defns(e, nuron_cmd_defns))
	352	return 0;
	353
	354	# ifndef OPENSSL_NO_RSA
	355	/*
	356	* We know that the "PKCS1_SSLeay()" functions hook properly to the
	357	* nuron-specific mod_exp and mod_exp_crt so we use those functions. NB:
	358	* We don't use ENGINE_openssl() or anything "more generic" because
	359	* something like the RSAref code may not hook properly, and if you own
	360	* one of these cards then you have the right to do RSA operations on it
	361	* anyway!
	362	*/
	363	meth1 = RSA_PKCS1_SSLeay();
	364	nuron_rsa.rsa_pub_enc = meth1->rsa_pub_enc;
	365	nuron_rsa.rsa_pub_dec = meth1->rsa_pub_dec;
	366	nuron_rsa.rsa_priv_enc = meth1->rsa_priv_enc;
	367	nuron_rsa.rsa_priv_dec = meth1->rsa_priv_dec;
	368	# endif
	369
	370	# ifndef OPENSSL_NO_DSA
	371	/*
	372	* Use the DSA_OpenSSL() method and just hook the mod_exp-ish bits.
	373	*/
	374	meth2 = DSA_OpenSSL();
	375	nuron_dsa.dsa_do_sign = meth2->dsa_do_sign;
	376	nuron_dsa.dsa_sign_setup = meth2->dsa_sign_setup;
	377	nuron_dsa.dsa_do_verify = meth2->dsa_do_verify;
	378	# endif
	379
	380	# ifndef OPENSSL_NO_DH
	381	/* Much the same for Diffie-Hellman */
	382	meth3 = DH_OpenSSL();
	383	nuron_dh.generate_key = meth3->generate_key;
	384	nuron_dh.compute_key = meth3->compute_key;
	385	# endif
	386
	387	/* Ensure the nuron error handling is set up */
	388	ERR_load_NURON_strings();
	389	return 1;
390	}
5572f482	391
0f113f3e	392	# ifdef OPENSSL_NO_DYNAMIC_ENGINE
5572f482	393	static ENGINE *engine_nuron(void)
0f113f3e MC	394	{
	395	ENGINE *ret = ENGINE_new();
	396	if (!ret)
	397	return NULL;
	398	if (!bind_helper(ret)) {
	399	ENGINE_free(ret);
	400	return NULL;
	401	}
	402	return ret;
	403	}
5572f482 RL	404
5572f482 RL	405	void ENGINE_load_nuron(void)
0f113f3e MC	406	{
	407	/* Copied from eng_[openssl\|dyn].c */
	408	ENGINE *toadd = engine_nuron();
	409	if (!toadd)
	410	return;
	411	ENGINE_add(toadd);
	412	ENGINE_free(toadd);
	413	ERR_clear_error();
	414	}
	415	# endif
5572f482	416
0f113f3e MC	417	/*
	418	* This stuff is needed if this ENGINE is being compiled into a
	419	* self-contained shared-library.
	420	*/
	421	# ifndef OPENSSL_NO_DYNAMIC_ENGINE
5572f482	422	static int bind_fn(ENGINE e, const char id)
0f113f3e MC	423	{
	424	if (id && (strcmp(id, engine_nuron_id) != 0))
	425	return 0;
	426	if (!bind_helper(e))
	427	return 0;
	428	return 1;
	429	}
5572f482	430
0f113f3e MC	431	IMPLEMENT_DYNAMIC_CHECK_FN()
	432	IMPLEMENT_DYNAMIC_BIND_FN(bind_fn)
	433	# endif /* OPENSSL_NO_DYNAMIC_ENGINE */
	434	# endif /* !OPENSSL_NO_HW_NURON */
	435	#endif /* !OPENSSL_NO_HW */