/* 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);

 	}