/* crypto/rsa/rsa_lib.c */

/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)

 * All rights reserved.

 *

 * This package is an SSL implementation written

 * by Eric Young (eay@cryptsoft.com).

 * The implementation was written so as to conform with Netscapes SSL.

 * 

 * This library is free for commercial and non-commercial use as long as

 * the following conditions are aheared to.  The following conditions

 * apply to all code found in this distribution, be it the RC4, RSA,

 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation

 * included with this distribution is covered by the same copyright terms

 * except that the holder is Tim Hudson (tjh@cryptsoft.com).

 * 

 * Copyright remains Eric Young's, and as such any Copyright notices in

 * the code are not to be removed.

 * If this package is used in a product, Eric Young should be given attribution

 * as the author of the parts of the library used.

 * This can be in the form of a textual message at program startup or

 * in documentation (online or textual) provided with the package.

 * 

 * 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 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 acknowledgement:

 *    "This product includes cryptographic software written by

 *     Eric Young (eay@cryptsoft.com)"

 *    The word 'cryptographic' can be left out if the rouines from the library

 *    being used are not cryptographic related :-).

 * 4. If you include any Windows specific code (or a derivative thereof) from 

 *    the apps directory (application code) you must include an acknowledgement:

 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"

 * 

 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``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 THE AUTHOR OR 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.

 * 

 * The licence and distribution terms for any publically available version or

 * derivative of this code cannot be changed.  i.e. this code cannot simply be

 * copied and put under another distribution licence

 * [including the GNU Public Licence.]

 */

/*

 © Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.

 */

#include <stdio.h>

#include <openssl/crypto.h>

#include "cryptlib.h"

#include <openssl/lhash.h>

#include <openssl/bn.h>

#include <openssl/rsa.h>

#include <openssl/rand.h>

#ifndef OPENSSL_NO_ENGINE

#include <openssl/engine.h>

#endif

#if (defined(SYMBIAN) && (defined(__WINSCW__) || defined(__WINS__)))

#include "libcrypto_wsd_macros.h"

#include "libcrypto_wsd.h"

#endif

const char RSA_version[]="RSA" OPENSSL_VERSION_PTEXT;

#ifndef EMULATOR

static const RSA_METHOD *default_RSA_meth=NULL;

#else

GET_STATIC_VAR_FROM_TLS(default_RSA_meth,rsa_lib,const RSA_METHOD *)

#define default_RSA_meth (*GET_WSD_VAR_NAME(default_RSA_meth,rsa_lib, s)())

#endif

EXPORT_C RSA *RSA_new(void)

	{

	RSA *r=RSA_new_method(NULL);

	return r;

	}

EXPORT_C void RSA_set_default_method(const RSA_METHOD *meth)

	{

	default_RSA_meth = meth;

	}

EXPORT_C const RSA_METHOD *RSA_get_default_method(void)

	{

	if (default_RSA_meth == NULL)

		{

#ifdef RSA_NULL

		default_RSA_meth=RSA_null_method();

#else

#if 0 /* was: #ifdef RSAref */

		default_RSA_meth=RSA_PKCS1_RSAref();

#else

		default_RSA_meth=RSA_PKCS1_SSLeay();

#endif

#endif

		}

	return default_RSA_meth;

	}

EXPORT_C const RSA_METHOD *RSA_get_method(const RSA *rsa)

	{

	return rsa->meth;

	}

EXPORT_C int RSA_set_method(RSA *rsa, const RSA_METHOD *meth)

	{

	/* NB: The caller is specifically setting a method, so it's not up to us

	 * to deal with which ENGINE it comes from. */

	const RSA_METHOD *mtmp;

	mtmp = rsa->meth;

	if (mtmp->finish) mtmp->finish(rsa);

#ifndef OPENSSL_NO_ENGINE

	if (rsa->engine)

		{

		ENGINE_finish(rsa->engine);

		rsa->engine = NULL;

		}

#endif

	rsa->meth = meth;

	if (meth->init) meth->init(rsa);

	return 1;

	}

EXPORT_C RSA *RSA_new_method(ENGINE *engine)

	{

	RSA *ret;

	ret=(RSA *)OPENSSL_malloc(sizeof(RSA));

	if (ret == NULL)

		{

		RSAerr(RSA_F_RSA_NEW_METHOD,ERR_R_MALLOC_FAILURE);

		return NULL;

		}

	ret->meth = RSA_get_default_method();

#ifndef OPENSSL_NO_ENGINE

	if (engine)

		{

		if (!ENGINE_init(engine))

			{

			RSAerr(RSA_F_RSA_NEW_METHOD, ERR_R_ENGINE_LIB);

			OPENSSL_free(ret);

			return NULL;

			}

		ret->engine = engine;

		}

	else

		ret->engine = ENGINE_get_default_RSA();

	if(ret->engine)

		{

		ret->meth = ENGINE_get_RSA(ret->engine);

		if(!ret->meth)

			{

			RSAerr(RSA_F_RSA_NEW_METHOD,

				ERR_R_ENGINE_LIB);

			ENGINE_finish(ret->engine);

			OPENSSL_free(ret);

			return NULL;

			}

		}

#endif

	ret->pad=0;

	ret->version=0;

	ret->n=NULL;

	ret->e=NULL;

	ret->d=NULL;

	ret->p=NULL;

	ret->q=NULL;

	ret->dmp1=NULL;

	ret->dmq1=NULL;

	ret->iqmp=NULL;

	ret->references=1;

	ret->_method_mod_n=NULL;

	ret->_method_mod_p=NULL;

	ret->_method_mod_q=NULL;

	ret->blinding=NULL;

	ret->mt_blinding=NULL;

	ret->bignum_data=NULL;

	ret->flags=ret->meth->flags;

	CRYPTO_new_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data);

	if ((ret->meth->init != NULL) && !ret->meth->init(ret))

		{

#ifndef OPENSSL_NO_ENGINE

		if (ret->engine)

			ENGINE_finish(ret->engine);

#endif

		CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data);

		OPENSSL_free(ret);

		ret=NULL;

		}

	return(ret);

	}

EXPORT_C void RSA_free(RSA *r)

	{

	int i;

	if (r == NULL) return;

	i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_RSA);

#ifdef REF_PRINT

	REF_PRINT("RSA",r);

#endif

	if (i > 0) return;

#ifdef REF_CHECK

	if (i < 0)

		{

		fprintf(stderr,"RSA_free, bad reference count\n");

		abort();

		}

#endif

	if (r->meth->finish)

		r->meth->finish(r);

#ifndef OPENSSL_NO_ENGINE

	if (r->engine)

		ENGINE_finish(r->engine);

#endif

	CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, r, &r->ex_data);

	if (r->n != NULL) BN_clear_free(r->n);

	if (r->e != NULL) BN_clear_free(r->e);

	if (r->d != NULL) BN_clear_free(r->d);

	if (r->p != NULL) BN_clear_free(r->p);

	if (r->q != NULL) BN_clear_free(r->q);

	if (r->dmp1 != NULL) BN_clear_free(r->dmp1);

	if (r->dmq1 != NULL) BN_clear_free(r->dmq1);

	if (r->iqmp != NULL) BN_clear_free(r->iqmp);

	if (r->blinding != NULL) BN_BLINDING_free(r->blinding);

	if (r->mt_blinding != NULL) BN_BLINDING_free(r->mt_blinding);

	if (r->bignum_data != NULL) OPENSSL_free_locked(r->bignum_data);

	OPENSSL_free(r);

	}

EXPORT_C int RSA_up_ref(RSA *r)

	{

	int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_RSA);

#ifdef REF_PRINT

	REF_PRINT("RSA",r);

#endif

#ifdef REF_CHECK

	if (i < 2)

		{

		fprintf(stderr, "RSA_up_ref, bad reference count\n");

		abort();

		}

#endif

	return ((i > 1) ? 1 : 0);

	}

EXPORT_C int RSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,

	     CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)

        {

	return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_RSA, argl, argp,

				new_func, dup_func, free_func);

        }

EXPORT_C int RSA_set_ex_data(RSA *r, int idx, void *arg)

	{

	return(CRYPTO_set_ex_data(&r->ex_data,idx,arg));

	}

EXPORT_C void *RSA_get_ex_data(const RSA *r, int idx)

	{

	return(CRYPTO_get_ex_data(&r->ex_data,idx));

	}

EXPORT_C int RSA_size(const RSA *r)

	{

	return(BN_num_bytes(r->n));

	}

EXPORT_C int RSA_public_encrypt(int flen, const unsigned char *from, unsigned char *to,

	     RSA *rsa, int padding)

	{

	return(rsa->meth->rsa_pub_enc(flen, from, to, rsa, padding));

	}

EXPORT_C int RSA_private_encrypt(int flen, const unsigned char *from, unsigned char *to,

	     RSA *rsa, int padding)

	{

	return(rsa->meth->rsa_priv_enc(flen, from, to, rsa, padding));

	}

EXPORT_C int RSA_private_decrypt(int flen, const unsigned char *from, unsigned char *to,

	     RSA *rsa, int padding)

	{

	return(rsa->meth->rsa_priv_dec(flen, from, to, rsa, padding));

	}

EXPORT_C int RSA_public_decrypt(int flen, const unsigned char *from, unsigned char *to,

	     RSA *rsa, int padding)

	{

	return(rsa->meth->rsa_pub_dec(flen, from, to, rsa, padding));

	}

EXPORT_C int RSA_flags(const RSA *r)

	{

	return((r == NULL)?0:r->meth->flags);

	}

EXPORT_C void RSA_blinding_off(RSA *rsa)

	{

	if (rsa->blinding != NULL)

		{

		BN_BLINDING_free(rsa->blinding);

		rsa->blinding=NULL;

		}

	rsa->flags &= ~RSA_FLAG_BLINDING;

	rsa->flags |= RSA_FLAG_NO_BLINDING;

	}

EXPORT_C int RSA_blinding_on(RSA *rsa, BN_CTX *ctx)

	{

	int ret=0;

	if (rsa->blinding != NULL)

		RSA_blinding_off(rsa);

	rsa->blinding = RSA_setup_blinding(rsa, ctx);

	if (rsa->blinding == NULL)

		goto err;

	rsa->flags |= RSA_FLAG_BLINDING;

	rsa->flags &= ~RSA_FLAG_NO_BLINDING;

	ret=1;

err:

	return(ret);

	}

static BIGNUM *rsa_get_public_exp(const BIGNUM *d, const BIGNUM *p,

	const BIGNUM *q, BN_CTX *ctx)

{

	BIGNUM *ret = NULL, *r0, *r1, *r2;

	if (d == NULL || p == NULL || q == NULL)

		return NULL;

	BN_CTX_start(ctx);

	r0 = BN_CTX_get(ctx);

	r1 = BN_CTX_get(ctx);

	r2 = BN_CTX_get(ctx);

	if (r2 == NULL)

		goto err;

	if (!BN_sub(r1, p, BN_value_one())) goto err;

	if (!BN_sub(r2, q, BN_value_one())) goto err;

	if (!BN_mul(r0, r1, r2, ctx)) goto err;

	ret = BN_mod_inverse(NULL, d, r0, ctx);

err:

	BN_CTX_end(ctx);

	return ret;

}

EXPORT_C BN_BLINDING *RSA_setup_blinding(RSA *rsa, BN_CTX *in_ctx)

{

	BIGNUM local_n;

	BIGNUM *e,*n;

	BN_CTX *ctx;

	BN_BLINDING *ret = NULL;

	if (in_ctx == NULL)

		{

		if ((ctx = BN_CTX_new()) == NULL) return 0;

		}

	else

		ctx = in_ctx;

	BN_CTX_start(ctx);

	e  = BN_CTX_get(ctx);

	if (e == NULL)

		{

		RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_MALLOC_FAILURE);

		goto err;

		}

	if (rsa->e == NULL)

		{

		e = rsa_get_public_exp(rsa->d, rsa->p, rsa->q, ctx);

		if (e == NULL)

			{

			RSAerr(RSA_F_RSA_SETUP_BLINDING, RSA_R_NO_PUBLIC_EXPONENT);

			goto err;

			}

		}

	else

		e = rsa->e;

	if ((RAND_status() == 0) && rsa->d != NULL && rsa->d->d != NULL)

		{

		/* if PRNG is not properly seeded, resort to secret

		 * exponent as unpredictable seed */

		RAND_add(rsa->d->d, rsa->d->dmax * sizeof rsa->d->d[0], 0.0);

		}

	if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME))

		{

		/* Set BN_FLG_CONSTTIME flag */

		n = &local_n;

		BN_with_flags(n, rsa->n, BN_FLG_CONSTTIME);

		}

	else

		n = rsa->n;

	ret = BN_BLINDING_create_param(NULL, e, n, ctx,

			rsa->meth->bn_mod_exp, rsa->_method_mod_n);

	if (ret == NULL)

		{

		RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_BN_LIB);

		goto err;

		}

	BN_BLINDING_set_thread_id(ret, CRYPTO_thread_id());

err:

	BN_CTX_end(ctx);

	if (in_ctx == NULL)

		BN_CTX_free(ctx);

	if(rsa->e == NULL)

		BN_free(e);

	return ret;

}

EXPORT_C int RSA_memory_lock(RSA *r)

	{

	int i,j,k,off;

	char *p;

	BIGNUM *bn,**t[6],*b;

	BN_ULONG *ul;

	if (r->d == NULL) return(1);

	t[0]= &r->d;

	t[1]= &r->p;

	t[2]= &r->q;

	t[3]= &r->dmp1;

	t[4]= &r->dmq1;

	t[5]= &r->iqmp;

	k=sizeof(BIGNUM)*6;

	off=k/sizeof(BN_ULONG)+1;

	j=1;

	for (i=0; i<6; i++)

		j+= (*t[i])->top;

	if ((p=OPENSSL_malloc_locked((off+j)*sizeof(BN_ULONG))) == NULL)

		{

		RSAerr(RSA_F_RSA_MEMORY_LOCK,ERR_R_MALLOC_FAILURE);

		return(0);

		}

	bn=(BIGNUM *)p;

	ul=(BN_ULONG *)&(p[off]);

	for (i=0; i<6; i++)

		{

		b= *(t[i]);

		*(t[i])= &(bn[i]);

		memcpy((char *)&(bn[i]),(char *)b,sizeof(BIGNUM));

		bn[i].flags=BN_FLG_STATIC_DATA;

		bn[i].d=ul;

		memcpy((char *)ul,b->d,sizeof(BN_ULONG)*b->top);

		ul+=b->top;

		BN_clear_free(b);

		}

	/* I should fix this so it can still be done */

	r->flags&= ~(RSA_FLAG_CACHE_PRIVATE|RSA_FLAG_CACHE_PUBLIC);

	r->bignum_data=p;

	return(1);

	}