Initial import

1 files changed, 893 insertions, 0 deletions

diff --git a/openssl/crypto/rsa/rsa_eay.c b/openssl/crypto/rsa/rsa_eay.c
new file mode 100644
index 00000000..7c941885
--- /dev/null
+++ b/openssl/crypto/rsa/rsa_eay.c
@@ -0,0 +1,893 @@
+/* crypto/rsa/rsa_eay.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.]
+ */
+/* ====================================================================
+ * Copyright (c) 1998-2006 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
+ *    openssl-core@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 "cryptlib.h"
+#include <openssl/bn.h>
+#include <openssl/rsa.h>
+#include <openssl/rand.h>
+
+#ifndef RSA_NULL
+
+static int RSA_eay_public_encrypt(int flen, const unsigned char *from,
+		unsigned char *to, RSA *rsa,int padding);
+static int RSA_eay_private_encrypt(int flen, const unsigned char *from,
+		unsigned char *to, RSA *rsa,int padding);
+static int RSA_eay_public_decrypt(int flen, const unsigned char *from,
+		unsigned char *to, RSA *rsa,int padding);
+static int RSA_eay_private_decrypt(int flen, const unsigned char *from,
+		unsigned char *to, RSA *rsa,int padding);
+static int RSA_eay_mod_exp(BIGNUM *r0, const BIGNUM *i, RSA *rsa, BN_CTX *ctx);
+static int RSA_eay_init(RSA *rsa);
+static int RSA_eay_finish(RSA *rsa);
+static RSA_METHOD rsa_pkcs1_eay_meth={
+	"Eric Young's PKCS#1 RSA",
+	RSA_eay_public_encrypt,
+	RSA_eay_public_decrypt, /* signature verification */
+	RSA_eay_private_encrypt, /* signing */
+	RSA_eay_private_decrypt,
+	RSA_eay_mod_exp,
+	BN_mod_exp_mont, /* XXX probably we should not use Montgomery if  e == 3 */
+	RSA_eay_init,
+	RSA_eay_finish,
+	0, /* flags */
+	NULL,
+	0, /* rsa_sign */
+	0, /* rsa_verify */
+	NULL /* rsa_keygen */
+	};
+
+const RSA_METHOD *RSA_PKCS1_SSLeay(void)
+	{
+	return(&rsa_pkcs1_eay_meth);
+	}
+
+static int RSA_eay_public_encrypt(int flen, const unsigned char *from,
+	     unsigned char *to, RSA *rsa, int padding)
+	{
+	BIGNUM *f,*ret;
+	int i,j,k,num=0,r= -1;
+	unsigned char *buf=NULL;
+	BN_CTX *ctx=NULL;
+
+	if (BN_num_bits(rsa->n) > OPENSSL_RSA_MAX_MODULUS_BITS)
+		{
+		RSAerr(RSA_F_RSA_EAY_PUBLIC_ENCRYPT, RSA_R_MODULUS_TOO_LARGE);
+		return -1;
+		}
+
+	if (BN_ucmp(rsa->n, rsa->e) <= 0)
+		{
+		RSAerr(RSA_F_RSA_EAY_PUBLIC_ENCRYPT, RSA_R_BAD_E_VALUE);
+		return -1;
+		}
+
+	/* for large moduli, enforce exponent limit */
+	if (BN_num_bits(rsa->n) > OPENSSL_RSA_SMALL_MODULUS_BITS)
+		{
+		if (BN_num_bits(rsa->e) > OPENSSL_RSA_MAX_PUBEXP_BITS)
+			{
+			RSAerr(RSA_F_RSA_EAY_PUBLIC_ENCRYPT, RSA_R_BAD_E_VALUE);
+			return -1;
+			}
+		}
+	
+	if ((ctx=BN_CTX_new()) == NULL) goto err;
+	BN_CTX_start(ctx);
+	f = BN_CTX_get(ctx);
+	ret = BN_CTX_get(ctx);
+	num=BN_num_bytes(rsa->n);
+	buf = OPENSSL_malloc(num);
+	if (!f || !ret || !buf)
+		{
+		RSAerr(RSA_F_RSA_EAY_PUBLIC_ENCRYPT,ERR_R_MALLOC_FAILURE);
+		goto err;
+		}
+
+	switch (padding)
+		{
+	case RSA_PKCS1_PADDING:
+		i=RSA_padding_add_PKCS1_type_2(buf,num,from,flen);
+		break;
+#ifndef OPENSSL_NO_SHA
+	case RSA_PKCS1_OAEP_PADDING:
+	        i=RSA_padding_add_PKCS1_OAEP(buf,num,from,flen,NULL,0);
+		break;
+#endif
+	case RSA_SSLV23_PADDING:
+		i=RSA_padding_add_SSLv23(buf,num,from,flen);
+		break;
+	case RSA_NO_PADDING:
+		i=RSA_padding_add_none(buf,num,from,flen);
+		break;
+	default:
+		RSAerr(RSA_F_RSA_EAY_PUBLIC_ENCRYPT,RSA_R_UNKNOWN_PADDING_TYPE);
+		goto err;
+		}
+	if (i <= 0) goto err;
+
+	if (BN_bin2bn(buf,num,f) == NULL) goto err;
+	
+	if (BN_ucmp(f, rsa->n) >= 0)
+		{
+		/* usually the padding functions would catch this */
+		RSAerr(RSA_F_RSA_EAY_PUBLIC_ENCRYPT,RSA_R_DATA_TOO_LARGE_FOR_MODULUS);
+		goto err;
+		}
+
+	if (rsa->flags & RSA_FLAG_CACHE_PUBLIC)
+		if (!BN_MONT_CTX_set_locked(&rsa->_method_mod_n, CRYPTO_LOCK_RSA, rsa->n, ctx))
+			goto err;
+
+	if (!rsa->meth->bn_mod_exp(ret,f,rsa->e,rsa->n,ctx,
+		rsa->_method_mod_n)) goto err;
+
+	/* put in leading 0 bytes if the number is less than the
+	 * length of the modulus */
+	j=BN_num_bytes(ret);
+	i=BN_bn2bin(ret,&(to[num-j]));
+	for (k=0; k<(num-i); k++)
+		to[k]=0;
+
+	r=num;
+err:
+	if (ctx != NULL)
+		{
+		BN_CTX_end(ctx);
+		BN_CTX_free(ctx);
+		}
+	if (buf != NULL) 
+		{
+		OPENSSL_cleanse(buf,num);
+		OPENSSL_free(buf);
+		}
+	return(r);
+	}
+
+static BN_BLINDING *rsa_get_blinding(RSA *rsa, int *local, BN_CTX *ctx)
+{
+	BN_BLINDING *ret;
+	int got_write_lock = 0;
+	CRYPTO_THREADID cur;
+
+	CRYPTO_r_lock(CRYPTO_LOCK_RSA);
+
+	if (rsa->blinding == NULL)
+		{
+		CRYPTO_r_unlock(CRYPTO_LOCK_RSA);
+		CRYPTO_w_lock(CRYPTO_LOCK_RSA);
+		got_write_lock = 1;
+
+		if (rsa->blinding == NULL)
+			rsa->blinding = RSA_setup_blinding(rsa, ctx);
+		}
+
+	ret = rsa->blinding;
+	if (ret == NULL)
+		goto err;
+
+	CRYPTO_THREADID_current(&cur);
+	if (!CRYPTO_THREADID_cmp(&cur, BN_BLINDING_thread_id(ret)))
+		{
+		/* rsa->blinding is ours! */
+
+		*local = 1;
+		}
+	else
+		{
+		/* resort to rsa->mt_blinding instead */
+
+		*local = 0; /* instructs rsa_blinding_convert(), rsa_blinding_invert()
+		             * that the BN_BLINDING is shared, meaning that accesses
+		             * require locks, and that the blinding factor must be
+		             * stored outside the BN_BLINDING
+		             */
+
+		if (rsa->mt_blinding == NULL)
+			{
+			if (!got_write_lock)
+				{
+				CRYPTO_r_unlock(CRYPTO_LOCK_RSA);
+				CRYPTO_w_lock(CRYPTO_LOCK_RSA);
+				got_write_lock = 1;
+				}
+			
+			if (rsa->mt_blinding == NULL)
+				rsa->mt_blinding = RSA_setup_blinding(rsa, ctx);
+			}
+		ret = rsa->mt_blinding;
+		}
+
+ err:
+	if (got_write_lock)
+		CRYPTO_w_unlock(CRYPTO_LOCK_RSA);
+	else
+		CRYPTO_r_unlock(CRYPTO_LOCK_RSA);
+	return ret;
+}
+
+static int rsa_blinding_convert(BN_BLINDING *b, int local, BIGNUM *f,
+	BIGNUM *r, BN_CTX *ctx)
+{
+	if (local)
+		return BN_BLINDING_convert_ex(f, NULL, b, ctx);
+	else
+		{
+		int ret;
+		CRYPTO_r_lock(CRYPTO_LOCK_RSA_BLINDING);
+		ret = BN_BLINDING_convert_ex(f, r, b, ctx);
+		CRYPTO_r_unlock(CRYPTO_LOCK_RSA_BLINDING);
+		return ret;
+		}
+}
+
+static int rsa_blinding_invert(BN_BLINDING *b, int local, BIGNUM *f,
+	BIGNUM *r, BN_CTX *ctx)
+{
+	if (local)
+		return BN_BLINDING_invert_ex(f, NULL, b, ctx);
+	else
+		{
+		int ret;
+		CRYPTO_w_lock(CRYPTO_LOCK_RSA_BLINDING);
+		ret = BN_BLINDING_invert_ex(f, r, b, ctx);
+		CRYPTO_w_unlock(CRYPTO_LOCK_RSA_BLINDING);
+		return ret;
+		}
+}
+
+/* signing */
+static int RSA_eay_private_encrypt(int flen, const unsigned char *from,
+	     unsigned char *to, RSA *rsa, int padding)
+	{
+	BIGNUM *f, *ret, *br, *res;
+	int i,j,k,num=0,r= -1;
+	unsigned char *buf=NULL;
+	BN_CTX *ctx=NULL;
+	int local_blinding = 0;
+	BN_BLINDING *blinding = NULL;
+
+	if ((ctx=BN_CTX_new()) == NULL) goto err;
+	BN_CTX_start(ctx);
+	f   = BN_CTX_get(ctx);
+	br  = BN_CTX_get(ctx);
+	ret = BN_CTX_get(ctx);
+	num = BN_num_bytes(rsa->n);
+	buf = OPENSSL_malloc(num);
+	if(!f || !ret || !buf)
+		{
+		RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,ERR_R_MALLOC_FAILURE);
+		goto err;
+		}
+
+	switch (padding)
+		{
+	case RSA_PKCS1_PADDING:
+		i=RSA_padding_add_PKCS1_type_1(buf,num,from,flen);
+		break;
+	case RSA_X931_PADDING:
+		i=RSA_padding_add_X931(buf,num,from,flen);
+		break;
+	case RSA_NO_PADDING:
+		i=RSA_padding_add_none(buf,num,from,flen);
+		break;
+	case RSA_SSLV23_PADDING:
+	default:
+		RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,RSA_R_UNKNOWN_PADDING_TYPE);
+		goto err;
+		}
+	if (i <= 0) goto err;
+
+	if (BN_bin2bn(buf,num,f) == NULL) goto err;
+	
+	if (BN_ucmp(f, rsa->n) >= 0)
+		{	
+		/* usually the padding functions would catch this */
+		RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,RSA_R_DATA_TOO_LARGE_FOR_MODULUS);
+		goto err;
+		}
+
+	if (!(rsa->flags & RSA_FLAG_NO_BLINDING))
+		{
+		blinding = rsa_get_blinding(rsa, &local_blinding, ctx);
+		if (blinding == NULL)
+			{
+			RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT, ERR_R_INTERNAL_ERROR);
+			goto err;
+			}
+		}
+	
+	if (blinding != NULL)
+		if (!rsa_blinding_convert(blinding, local_blinding, f, br, ctx))
+			goto err;
+
+	if ( (rsa->flags & RSA_FLAG_EXT_PKEY) ||
+		((rsa->p != NULL) &&
+		(rsa->q != NULL) &&
+		(rsa->dmp1 != NULL) &&
+		(rsa->dmq1 != NULL) &&
+		(rsa->iqmp != NULL)) )
+		{ 
+		if (!rsa->meth->rsa_mod_exp(ret, f, rsa, ctx)) goto err;
+		}
+	else
+		{
+		BIGNUM local_d;
+		BIGNUM *d = NULL;
+		
+		if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME))
+			{
+			BN_init(&local_d);
+			d = &local_d;
+			BN_with_flags(d, rsa->d, BN_FLG_CONSTTIME);
+			}
+		else
+			d= rsa->d;
+
+		if (rsa->flags & RSA_FLAG_CACHE_PUBLIC)
+			if(!BN_MONT_CTX_set_locked(&rsa->_method_mod_n, CRYPTO_LOCK_RSA, rsa->n, ctx))
+				goto err;
+
+		if (!rsa->meth->bn_mod_exp(ret,f,d,rsa->n,ctx,
+				rsa->_method_mod_n)) goto err;
+		}
+
+	if (blinding)
+		if (!rsa_blinding_invert(blinding, local_blinding, ret, br, ctx))
+			goto err;
+
+	if (padding == RSA_X931_PADDING)
+		{
+		BN_sub(f, rsa->n, ret);
+		if (BN_cmp(ret, f))
+			res = f;
+		else
+			res = ret;
+		}
+	else
+		res = ret;
+
+	/* put in leading 0 bytes if the number is less than the
+	 * length of the modulus */
+	j=BN_num_bytes(res);
+	i=BN_bn2bin(res,&(to[num-j]));
+	for (k=0; k<(num-i); k++)
+		to[k]=0;
+
+	r=num;
+err:
+	if (ctx != NULL)
+		{
+		BN_CTX_end(ctx);
+		BN_CTX_free(ctx);
+		}
+	if (buf != NULL)
+		{
+		OPENSSL_cleanse(buf,num);
+		OPENSSL_free(buf);
+		}
+	return(r);
+	}
+
+static int RSA_eay_private_decrypt(int flen, const unsigned char *from,
+	     unsigned char *to, RSA *rsa, int padding)
+	{
+	BIGNUM *f, *ret, *br;
+	int j,num=0,r= -1;
+	unsigned char *p;
+	unsigned char *buf=NULL;
+	BN_CTX *ctx=NULL;
+	int local_blinding = 0;
+	BN_BLINDING *blinding = NULL;
+
+	if((ctx = BN_CTX_new()) == NULL) goto err;
+	BN_CTX_start(ctx);
+	f   = BN_CTX_get(ctx);
+	br  = BN_CTX_get(ctx);
+	ret = BN_CTX_get(ctx);
+	num = BN_num_bytes(rsa->n);
+	buf = OPENSSL_malloc(num);
+	if(!f || !ret || !buf)
+		{
+		RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,ERR_R_MALLOC_FAILURE);
+		goto err;
+		}
+
+	/* This check was for equality but PGP does evil things
+	 * and chops off the top '0' bytes */
+	if (flen > num)
+		{
+		RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,RSA_R_DATA_GREATER_THAN_MOD_LEN);
+		goto err;
+		}
+
+	/* make data into a big number */
+	if (BN_bin2bn(from,(int)flen,f) == NULL) goto err;
+
+	if (BN_ucmp(f, rsa->n) >= 0)
+		{
+		RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,RSA_R_DATA_TOO_LARGE_FOR_MODULUS);
+		goto err;
+		}
+
+	if (!(rsa->flags & RSA_FLAG_NO_BLINDING))
+		{
+		blinding = rsa_get_blinding(rsa, &local_blinding, ctx);
+		if (blinding == NULL)
+			{
+			RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT, ERR_R_INTERNAL_ERROR);
+			goto err;
+			}
+		}
+	
+	if (blinding != NULL)
+		if (!rsa_blinding_convert(blinding, local_blinding, f, br, ctx))
+			goto err;
+
+	/* do the decrypt */
+	if ( (rsa->flags & RSA_FLAG_EXT_PKEY) ||
+		((rsa->p != NULL) &&
+		(rsa->q != NULL) &&
+		(rsa->dmp1 != NULL) &&
+		(rsa->dmq1 != NULL) &&
+		(rsa->iqmp != NULL)) )
+		{
+		if (!rsa->meth->rsa_mod_exp(ret, f, rsa, ctx)) goto err;
+		}
+	else
+		{
+		BIGNUM local_d;
+		BIGNUM *d = NULL;
+		
+		if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME))
+			{
+			d = &local_d;
+			BN_with_flags(d, rsa->d, BN_FLG_CONSTTIME);
+			}
+		else
+			d = rsa->d;
+
+		if (rsa->flags & RSA_FLAG_CACHE_PUBLIC)
+			if (!BN_MONT_CTX_set_locked(&rsa->_method_mod_n, CRYPTO_LOCK_RSA, rsa->n, ctx))
+				goto err;
+		if (!rsa->meth->bn_mod_exp(ret,f,d,rsa->n,ctx,
+				rsa->_method_mod_n))
+		  goto err;
+		}
+
+	if (blinding)
+		if (!rsa_blinding_invert(blinding, local_blinding, ret, br, ctx))
+			goto err;
+
+	p=buf;
+	j=BN_bn2bin(ret,p); /* j is only used with no-padding mode */
+
+	switch (padding)
+		{
+	case RSA_PKCS1_PADDING:
+		r=RSA_padding_check_PKCS1_type_2(to,num,buf,j,num);
+		break;
+#ifndef OPENSSL_NO_SHA
+        case RSA_PKCS1_OAEP_PADDING:
+	        r=RSA_padding_check_PKCS1_OAEP(to,num,buf,j,num,NULL,0);
+                break;
+#endif
+ 	case RSA_SSLV23_PADDING:
+		r=RSA_padding_check_SSLv23(to,num,buf,j,num);
+		break;
+	case RSA_NO_PADDING:
+		r=RSA_padding_check_none(to,num,buf,j,num);
+		break;
+	default:
+		RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,RSA_R_UNKNOWN_PADDING_TYPE);
+		goto err;
+		}
+	if (r < 0)
+		RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,RSA_R_PADDING_CHECK_FAILED);
+
+err:
+	if (ctx != NULL)
+		{
+		BN_CTX_end(ctx);
+		BN_CTX_free(ctx);
+		}
+	if (buf != NULL)
+		{
+		OPENSSL_cleanse(buf,num);
+		OPENSSL_free(buf);
+		}
+	return(r);
+	}
+
+/* signature verification */
+static int RSA_eay_public_decrypt(int flen, const unsigned char *from,
+	     unsigned char *to, RSA *rsa, int padding)
+	{
+	BIGNUM *f,*ret;
+	int i,num=0,r= -1;
+	unsigned char *p;
+	unsigned char *buf=NULL;
+	BN_CTX *ctx=NULL;
+
+	if (BN_num_bits(rsa->n) > OPENSSL_RSA_MAX_MODULUS_BITS)
+		{
+		RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT, RSA_R_MODULUS_TOO_LARGE);
+		return -1;
+		}
+
+	if (BN_ucmp(rsa->n, rsa->e) <= 0)
+		{
+		RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT, RSA_R_BAD_E_VALUE);
+		return -1;
+		}
+
+	/* for large moduli, enforce exponent limit */
+	if (BN_num_bits(rsa->n) > OPENSSL_RSA_SMALL_MODULUS_BITS)
+		{
+		if (BN_num_bits(rsa->e) > OPENSSL_RSA_MAX_PUBEXP_BITS)
+			{
+			RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT, RSA_R_BAD_E_VALUE);
+			return -1;
+			}
+		}
+	
+	if((ctx = BN_CTX_new()) == NULL) goto err;
+	BN_CTX_start(ctx);
+	f = BN_CTX_get(ctx);
+	ret = BN_CTX_get(ctx);
+	num=BN_num_bytes(rsa->n);
+	buf = OPENSSL_malloc(num);
+	if(!f || !ret || !buf)
+		{
+		RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,ERR_R_MALLOC_FAILURE);
+		goto err;
+		}
+
+	/* This check was for equality but PGP does evil things
+	 * and chops off the top '0' bytes */
+	if (flen > num)
+		{
+		RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,RSA_R_DATA_GREATER_THAN_MOD_LEN);
+		goto err;
+		}
+
+	if (BN_bin2bn(from,flen,f) == NULL) goto err;
+
+	if (BN_ucmp(f, rsa->n) >= 0)
+		{
+		RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,RSA_R_DATA_TOO_LARGE_FOR_MODULUS);
+		goto err;
+		}
+
+	if (rsa->flags & RSA_FLAG_CACHE_PUBLIC)
+		if (!BN_MONT_CTX_set_locked(&rsa->_method_mod_n, CRYPTO_LOCK_RSA, rsa->n, ctx))
+			goto err;
+
+	if (!rsa->meth->bn_mod_exp(ret,f,rsa->e,rsa->n,ctx,
+		rsa->_method_mod_n)) goto err;
+
+	if ((padding == RSA_X931_PADDING) && ((ret->d[0] & 0xf) != 12))
+		if (!BN_sub(ret, rsa->n, ret)) goto err;
+
+	p=buf;
+	i=BN_bn2bin(ret,p);
+
+	switch (padding)
+		{
+	case RSA_PKCS1_PADDING:
+		r=RSA_padding_check_PKCS1_type_1(to,num,buf,i,num);
+		break;
+	case RSA_X931_PADDING:
+		r=RSA_padding_check_X931(to,num,buf,i,num);
+		break;
+	case RSA_NO_PADDING:
+		r=RSA_padding_check_none(to,num,buf,i,num);
+		break;
+	default:
+		RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,RSA_R_UNKNOWN_PADDING_TYPE);
+		goto err;
+		}
+	if (r < 0)
+		RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,RSA_R_PADDING_CHECK_FAILED);
+
+err:
+	if (ctx != NULL)
+		{
+		BN_CTX_end(ctx);
+		BN_CTX_free(ctx);
+		}
+	if (buf != NULL)
+		{
+		OPENSSL_cleanse(buf,num);
+		OPENSSL_free(buf);
+		}
+	return(r);
+	}
+
+static int RSA_eay_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa, BN_CTX *ctx)
+	{
+	BIGNUM *r1,*m1,*vrfy;
+	BIGNUM local_dmp1,local_dmq1,local_c,local_r1;
+	BIGNUM *dmp1,*dmq1,*c,*pr1;
+	int ret=0;
+
+	BN_CTX_start(ctx);
+	r1 = BN_CTX_get(ctx);
+	m1 = BN_CTX_get(ctx);
+	vrfy = BN_CTX_get(ctx);
+
+	{
+		BIGNUM local_p, local_q;
+		BIGNUM *p = NULL, *q = NULL;
+
+		/* Make sure BN_mod_inverse in Montgomery intialization uses the
+		 * BN_FLG_CONSTTIME flag (unless RSA_FLAG_NO_CONSTTIME is set)
+		 */
+		if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME))
+			{
+			BN_init(&local_p);
+			p = &local_p;
+			BN_with_flags(p, rsa->p, BN_FLG_CONSTTIME);
+
+			BN_init(&local_q);
+			q = &local_q;
+			BN_with_flags(q, rsa->q, BN_FLG_CONSTTIME);
+			}
+		else
+			{
+			p = rsa->p;
+			q = rsa->q;
+			}
+
+		if (rsa->flags & RSA_FLAG_CACHE_PRIVATE)
+			{
+			if (!BN_MONT_CTX_set_locked(&rsa->_method_mod_p, CRYPTO_LOCK_RSA, p, ctx))
+				goto err;
+			if (!BN_MONT_CTX_set_locked(&rsa->_method_mod_q, CRYPTO_LOCK_RSA, q, ctx))
+				goto err;
+			}
+	}
+
+	if (rsa->flags & RSA_FLAG_CACHE_PUBLIC)
+		if (!BN_MONT_CTX_set_locked(&rsa->_method_mod_n, CRYPTO_LOCK_RSA, rsa->n, ctx))
+			goto err;
+
+	/* compute I mod q */
+	if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME))
+		{
+		c = &local_c;
+		BN_with_flags(c, I, BN_FLG_CONSTTIME);
+		if (!BN_mod(r1,c,rsa->q,ctx)) goto err;
+		}
+	else
+		{
+		if (!BN_mod(r1,I,rsa->q,ctx)) goto err;
+		}
+
+	/* compute r1^dmq1 mod q */
+	if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME))
+		{
+		dmq1 = &local_dmq1;
+		BN_with_flags(dmq1, rsa->dmq1, BN_FLG_CONSTTIME);
+		}
+	else
+		dmq1 = rsa->dmq1;
+	if (!rsa->meth->bn_mod_exp(m1,r1,dmq1,rsa->q,ctx,
+		rsa->_method_mod_q)) goto err;
+
+	/* compute I mod p */
+	if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME))
+		{
+		c = &local_c;
+		BN_with_flags(c, I, BN_FLG_CONSTTIME);
+		if (!BN_mod(r1,c,rsa->p,ctx)) goto err;
+		}
+	else
+		{
+		if (!BN_mod(r1,I,rsa->p,ctx)) goto err;
+		}
+
+	/* compute r1^dmp1 mod p */
+	if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME))
+		{
+		dmp1 = &local_dmp1;
+		BN_with_flags(dmp1, rsa->dmp1, BN_FLG_CONSTTIME);
+		}
+	else
+		dmp1 = rsa->dmp1;
+	if (!rsa->meth->bn_mod_exp(r0,r1,dmp1,rsa->p,ctx,
+		rsa->_method_mod_p)) goto err;
+
+	if (!BN_sub(r0,r0,m1)) goto err;
+	/* This will help stop the size of r0 increasing, which does
+	 * affect the multiply if it optimised for a power of 2 size */
+	if (BN_is_negative(r0))
+		if (!BN_add(r0,r0,rsa->p)) goto err;
+
+	if (!BN_mul(r1,r0,rsa->iqmp,ctx)) goto err;
+
+	/* Turn BN_FLG_CONSTTIME flag on before division operation */
+	if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME))
+		{
+		pr1 = &local_r1;
+		BN_with_flags(pr1, r1, BN_FLG_CONSTTIME);
+		}
+	else
+		pr1 = r1;
+	if (!BN_mod(r0,pr1,rsa->p,ctx)) goto err;
+
+	/* If p < q it is occasionally possible for the correction of
+         * adding 'p' if r0 is negative above to leave the result still
+	 * negative. This can break the private key operations: the following
+	 * second correction should *always* correct this rare occurrence.
+	 * This will *never* happen with OpenSSL generated keys because
+         * they ensure p > q [steve]
+         */
+	if (BN_is_negative(r0))
+		if (!BN_add(r0,r0,rsa->p)) goto err;
+	if (!BN_mul(r1,r0,rsa->q,ctx)) goto err;
+	if (!BN_add(r0,r1,m1)) goto err;
+
+	if (rsa->e && rsa->n)
+		{
+		if (!rsa->meth->bn_mod_exp(vrfy,r0,rsa->e,rsa->n,ctx,rsa->_method_mod_n)) goto err;
+		/* If 'I' was greater than (or equal to) rsa->n, the operation
+		 * will be equivalent to using 'I mod n'. However, the result of
+		 * the verify will *always* be less than 'n' so we don't check
+		 * for absolute equality, just congruency. */
+		if (!BN_sub(vrfy, vrfy, I)) goto err;
+		if (!BN_mod(vrfy, vrfy, rsa->n, ctx)) goto err;
+		if (BN_is_negative(vrfy))
+			if (!BN_add(vrfy, vrfy, rsa->n)) goto err;
+		if (!BN_is_zero(vrfy))
+			{
+			/* 'I' and 'vrfy' aren't congruent mod n. Don't leak
+			 * miscalculated CRT output, just do a raw (slower)
+			 * mod_exp and return that instead. */
+
+			BIGNUM local_d;
+			BIGNUM *d = NULL;
+		
+			if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME))
+				{
+				d = &local_d;
+				BN_with_flags(d, rsa->d, BN_FLG_CONSTTIME);
+				}
+			else
+				d = rsa->d;
+			if (!rsa->meth->bn_mod_exp(r0,I,d,rsa->n,ctx,
+						   rsa->_method_mod_n)) goto err;
+			}
+		}
+	ret=1;
+err:
+	BN_CTX_end(ctx);
+	return(ret);
+	}
+
+static int RSA_eay_init(RSA *rsa)
+	{
+	rsa->flags|=RSA_FLAG_CACHE_PUBLIC|RSA_FLAG_CACHE_PRIVATE;
+	return(1);
+	}
+
+static int RSA_eay_finish(RSA *rsa)
+	{
+	if (rsa->_method_mod_n != NULL)
+		BN_MONT_CTX_free(rsa->_method_mod_n);
+	if (rsa->_method_mod_p != NULL)
+		BN_MONT_CTX_free(rsa->_method_mod_p);
+	if (rsa->_method_mod_q != NULL)
+		BN_MONT_CTX_free(rsa->_method_mod_q);
+	return(1);
+	}
+
+#endif