e_cswift.c

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/* crypto/engine/hw_cswift.c */
/* Written by Geoff Thorpe ([e-mail]) for the OpenSSL
 * project 2000.
 */
/* ====================================================================
 * Copyright (c) 1999-2001 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
 *    [e-mail].
 *
 * 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
 * ([e-mail]).  This product includes software written by Tim
 * Hudson ([e-mail]).
 *
 */

#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/rand.h>
#include <openssl/bn.h>

#ifndef OPENSSL_NO_HW
#ifndef OPENSSL_NO_HW_CSWIFT

/* Attribution notice: Rainbow have generously allowed me to reproduce
 * the necessary definitions here from their API. This means the support
 * can build independently of whether application builders have the
 * API or hardware. This will allow developers to easily produce software
 * that has latent hardware support for any users that have accelerators
 * installed, without the developers themselves needing anything extra.
 *
 * I have only clipped the parts from the CryptoSwift header files that
 * are (or seem) relevant to the CryptoSwift support code. This is
 * simply to keep the file sizes reasonable.
 * [Geoff]
 */
#ifdef FLAT_INC
#include "cswift.h"
#else
#include "vendor_defns/cswift.h"
#endif

#define CSWIFT_LIB_NAME "cswift engine"
#include "e_cswift_err.c"

#define DECIMAL_SIZE(type)	((sizeof(type)*8+2)/3+1)

static int cswift_destroy(ENGINE *e);
static int cswift_init(ENGINE *e);
static int cswift_finish(ENGINE *e);
static int cswift_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f)(void));
#ifndef OPENSSL_NO_RSA
static int cswift_bn_32copy(SW_LARGENUMBER * out, const BIGNUM * in);
#endif

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

#ifndef OPENSSL_NO_RSA
/* RSA stuff */
static int cswift_rsa_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa, BN_CTX *ctx);
/* This function is aliased to mod_exp (with the mont stuff dropped). */
static int cswift_mod_exp_mont(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
		const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx);
#endif

#ifndef OPENSSL_NO_DSA
/* DSA stuff */
static DSA_SIG *cswift_dsa_sign(const unsigned char *dgst, int dlen, DSA *dsa);
static int cswift_dsa_verify(const unsigned char *dgst, int dgst_len,
				DSA_SIG *sig, DSA *dsa);
#endif

#ifndef OPENSSL_NO_DH
/* DH stuff */
/* This function is alised to mod_exp (with the DH and mont dropped). */
static int cswift_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 */
static int cswift_rand_bytes(unsigned char *buf, int num);
static int cswift_rand_status(void);

/* The definitions for control commands specific to this engine */
#define CSWIFT_CMD_SO_PATH		ENGINE_CMD_BASE
static const ENGINE_CMD_DEFN cswift_cmd_defns[] = {
	{CSWIFT_CMD_SO_PATH,
		"SO_PATH",
		"Specifies the path to the 'cswift' 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 cswift_rsa =
	{
	"CryptoSwift RSA method",
	NULL,
	NULL,
	NULL,
	NULL,
	cswift_rsa_mod_exp,
	cswift_mod_exp_mont,
	NULL,
	NULL,
	0,
	NULL,
	NULL,
	NULL,
	NULL
	};
#endif

#ifndef OPENSSL_NO_DSA
/* Our internal DSA_METHOD that we provide pointers to */
static DSA_METHOD cswift_dsa =
	{
	"CryptoSwift DSA method",
	cswift_dsa_sign,
	NULL, /* dsa_sign_setup */
	cswift_dsa_verify,
	NULL, /* dsa_mod_exp */
	NULL, /* bn_mod_exp */
	NULL, /* init */
	NULL, /* finish */
	0, /* flags */
	NULL, /* app_data */
	NULL, /* dsa_paramgen */
	NULL /* dsa_keygen */
	};
#endif

#ifndef OPENSSL_NO_DH
/* Our internal DH_METHOD that we provide pointers to */
static DH_METHOD cswift_dh =
	{
	"CryptoSwift DH method",
	NULL,
	NULL,
	cswift_mod_exp_dh,
	NULL,
	NULL,
	0,
	NULL,
	NULL
	};
#endif

static RAND_METHOD cswift_random =
    {
    /* "CryptoSwift RAND method", */
    NULL,
    cswift_rand_bytes,
    NULL,
    NULL,
    cswift_rand_bytes,
    cswift_rand_status,
    };


/* Constants used when creating the ENGINE */
static const char *engine_cswift_id = "cswift";
static const char *engine_cswift_name = "CryptoSwift hardware engine support";

/* This internal function is used by ENGINE_cswift() 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_DH
	const DH_METHOD *meth2;
#endif
	if(!ENGINE_set_id(e, engine_cswift_id) ||
			!ENGINE_set_name(e, engine_cswift_name) ||
#ifndef OPENSSL_NO_RSA
			!ENGINE_set_RSA(e, &cswift_rsa) ||
#endif
#ifndef OPENSSL_NO_DSA
			!ENGINE_set_DSA(e, &cswift_dsa) ||
#endif
#ifndef OPENSSL_NO_DH
			!ENGINE_set_DH(e, &cswift_dh) ||
#endif
			!ENGINE_set_RAND(e, &cswift_random) ||
			!ENGINE_set_destroy_function(e, cswift_destroy) ||
			!ENGINE_set_init_function(e, cswift_init) ||
			!ENGINE_set_finish_function(e, cswift_finish) ||
			!ENGINE_set_ctrl_function(e, cswift_ctrl) ||
			!ENGINE_set_cmd_defns(e, cswift_cmd_defns))
		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();
	cswift_rsa.rsa_pub_enc = meth1->rsa_pub_enc;
	cswift_rsa.rsa_pub_dec = meth1->rsa_pub_dec;
	cswift_rsa.rsa_priv_enc = meth1->rsa_priv_enc;
	cswift_rsa.rsa_priv_dec = meth1->rsa_priv_dec;
#endif

#ifndef OPENSSL_NO_DH
	/* Much the same for Diffie-Hellman */
	meth2 = DH_OpenSSL();
	cswift_dh.generate_key = meth2->generate_key;
	cswift_dh.compute_key = meth2->compute_key;
#endif

	/* Ensure the cswift error handling is set up */
	ERR_load_CSWIFT_strings();
	return 1;
	}

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

void ENGINE_load_cswift(void)
	{
	/* Copied from eng_[openssl|dyn].c */
	ENGINE *toadd = engine_cswift();
	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 CryptoSwift 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 *cswift_dso = NULL;

/* These are the function pointers that are (un)set when the library has
 * successfully (un)loaded. */
t_swAcquireAccContext *p_CSwift_AcquireAccContext = NULL;
t_swAttachKeyParam *p_CSwift_AttachKeyParam = NULL;
t_swSimpleRequest *p_CSwift_SimpleRequest = NULL;
t_swReleaseAccContext *p_CSwift_ReleaseAccContext = NULL;

/* Used in the DSO operations. */
static const char *CSWIFT_LIBNAME = NULL;
static const char *get_CSWIFT_LIBNAME(void)
	{
	if(CSWIFT_LIBNAME)
		return CSWIFT_LIBNAME;
	return "swift";
	}
static void free_CSWIFT_LIBNAME(void)
	{
	if(CSWIFT_LIBNAME)
		OPENSSL_free((void*)CSWIFT_LIBNAME);
	CSWIFT_LIBNAME = NULL;
	}
static long set_CSWIFT_LIBNAME(const char *name)
	{
	free_CSWIFT_LIBNAME();
	return (((CSWIFT_LIBNAME = BUF_strdup(name)) != NULL) ? 1 : 0);
	}
static const char *CSWIFT_F1 = "swAcquireAccContext";
static const char *CSWIFT_F2 = "swAttachKeyParam";
static const char *CSWIFT_F3 = "swSimpleRequest";
static const char *CSWIFT_F4 = "swReleaseAccContext";


/* CryptoSwift 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. */

/* utility function to obtain a context */
static int get_context(SW_CONTEXT_HANDLE *hac)
	{
        SW_STATUS status;
 
        status = p_CSwift_AcquireAccContext(hac);
        if(status != SW_OK)
                return 0;
        return 1;
	}
 
/* similarly to release one. */
static void release_context(SW_CONTEXT_HANDLE hac)
	{
        p_CSwift_ReleaseAccContext(hac);
	}

/* Destructor (complements the "ENGINE_cswift()" constructor) */
static int cswift_destroy(ENGINE *e)
	{
	free_CSWIFT_LIBNAME();
	ERR_unload_CSWIFT_strings();
	return 1;
	}