[thirdparty/openssl.git] / crypto / rsa / rsa_eay.c

/* 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.]
 */

#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, unsigned char *from,
		unsigned char *to, RSA *rsa,int padding);
static int RSA_eay_private_encrypt(int flen, unsigned char *from,
		unsigned char *to, RSA *rsa,int padding);
static int RSA_eay_public_decrypt(int flen, unsigned char *from,
		unsigned char *to, RSA *rsa,int padding);
static int RSA_eay_private_decrypt(int flen, unsigned char *from,
		unsigned char *to, RSA *rsa,int padding);
static int RSA_eay_mod_exp(BIGNUM *r0, BIGNUM *i, RSA *rsa);
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,
	RSA_eay_private_encrypt,
	RSA_eay_private_decrypt,
	RSA_eay_mod_exp,
	BN_mod_exp_mont,
	RSA_eay_init,
	RSA_eay_finish,
	0,
	NULL,
	};

RSA_METHOD *RSA_PKCS1_SSLeay(void)
	{
	return(&rsa_pkcs1_eay_meth);
	}

static int RSA_eay_public_encrypt(int flen, 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;

	BN_init(&f);
	BN_init(&ret);
	if ((ctx=BN_CTX_new()) == NULL) goto err;
	num=BN_num_bytes(rsa->n);
	if ((buf=(unsigned char *)OPENSSL_malloc(num)) == NULL)
		{
		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 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 ((rsa->_method_mod_n == NULL) && (rsa->flags & RSA_FLAG_CACHE_PUBLIC))
		{
		if ((rsa->_method_mod_n=BN_MONT_CTX_new()) != NULL)
			if (!BN_MONT_CTX_set(rsa->_method_mod_n,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_free(ctx);
	BN_clear_free(&f);
	BN_clear_free(&ret);
	if (buf != NULL) 
		{
		memset(buf,0,num);
		OPENSSL_free(buf);
		}
	return(r);
	}

static int RSA_eay_private_encrypt(int flen, 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;

	BN_init(&f);
	BN_init(&ret);

	if ((ctx=BN_CTX_new()) == NULL) goto err;
	num=BN_num_bytes(rsa->n);
	if ((buf=(unsigned char *)OPENSSL_malloc(num)) == NULL)
		{
		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_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 ((rsa->flags & RSA_FLAG_BLINDING) && (rsa->blinding == NULL))
		RSA_blinding_on(rsa,ctx);
	if (rsa->flags & RSA_FLAG_BLINDING)
		if (!BN_BLINDING_convert(&f,rsa->blinding,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)) goto err; }
	else
		{
		if (!rsa->meth->bn_mod_exp(&ret,&f,rsa->d,rsa->n,ctx,NULL)) goto err;
		}

	if (rsa->flags & RSA_FLAG_BLINDING)
		if (!BN_BLINDING_invert(&ret,rsa->blinding,ctx)) 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_free(ctx);
	BN_clear_free(&ret);
	BN_clear_free(&f);
	if (buf != NULL)
		{
		memset(buf,0,num);
		OPENSSL_free(buf);
		}
	return(r);
	}

static int RSA_eay_private_decrypt(int flen, unsigned char *from,
	     unsigned char *to, RSA *rsa, int padding)
	{
	BIGNUM f,ret;
	int j,num=0,r= -1;
	unsigned char *p;
	unsigned char *buf=NULL;
	BN_CTX *ctx=NULL;

	BN_init(&f);
	BN_init(&ret);
	ctx=BN_CTX_new();
	if (ctx == NULL) goto err;

	num=BN_num_bytes(rsa->n);

	if ((buf=(unsigned char *)OPENSSL_malloc(num)) == NULL)
		{
		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 ((rsa->flags & RSA_FLAG_BLINDING) && (rsa->blinding == NULL))
		RSA_blinding_on(rsa,ctx);
	if (rsa->flags & RSA_FLAG_BLINDING)
		if (!BN_BLINDING_convert(&f,rsa->blinding,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)) goto err; }
	else
		{
		if (!rsa->meth->bn_mod_exp(&ret,&f,rsa->d,rsa->n,ctx,NULL))
			goto err;
		}

	if (rsa->flags & RSA_FLAG_BLINDING)
		if (!BN_BLINDING_invert(&ret,rsa->blinding,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 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_free(ctx);
	BN_clear_free(&f);
	BN_clear_free(&ret);
	if (buf != NULL)
		{
		memset(buf,0,num);
		OPENSSL_free(buf);
		}
	return(r);
	}

static int RSA_eay_public_decrypt(int flen, 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;

	BN_init(&f);
	BN_init(&ret);
	ctx=BN_CTX_new();
	if (ctx == NULL) goto err;

	num=BN_num_bytes(rsa->n);
	buf=(unsigned char *)OPENSSL_malloc(num);
	if (buf == NULL)
		{
		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;
	/* do the decrypt */
	if ((rsa->_method_mod_n == NULL) && (rsa->flags & RSA_FLAG_CACHE_PUBLIC))
		{
		if ((rsa->_method_mod_n=BN_MONT_CTX_new()) != NULL)
			if (!BN_MONT_CTX_set(rsa->_method_mod_n,rsa->n,ctx))
			    goto err;
		}

	if (!rsa->meth->bn_mod_exp(&ret,&f,rsa->e,rsa->n,ctx,
		rsa->_method_mod_n)) 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_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_free(ctx);
	BN_clear_free(&f);
	BN_clear_free(&ret);
	if (buf != NULL)
		{
		memset(buf,0,num);
		OPENSSL_free(buf);
		}
	return(r);
	}

static int RSA_eay_mod_exp(BIGNUM *r0, BIGNUM *I, RSA *rsa)
	{
	BIGNUM r1,m1;
	int ret=0;
	BN_CTX *ctx;

	if ((ctx=BN_CTX_new()) == NULL) goto err;
	BN_init(&m1);
	BN_init(&r1);

	if (rsa->flags & RSA_FLAG_CACHE_PRIVATE)
		{
		if (rsa->_method_mod_p == NULL)
			{
			if ((rsa->_method_mod_p=BN_MONT_CTX_new()) != NULL)
				if (!BN_MONT_CTX_set(rsa->_method_mod_p,rsa->p,
						     ctx))
					goto err;
			}
		if (rsa->_method_mod_q == NULL)
			{
			if ((rsa->_method_mod_q=BN_MONT_CTX_new()) != NULL)
				if (!BN_MONT_CTX_set(rsa->_method_mod_q,rsa->q,
						     ctx))
					goto err;
			}
		}

	if (!BN_mod(&r1,I,rsa->q,ctx)) goto err;
	if (!rsa->meth->bn_mod_exp(&m1,&r1,rsa->dmq1,rsa->q,ctx,
		rsa->_method_mod_q)) goto err;

	if (!BN_mod(&r1,I,rsa->p,ctx)) goto err;
	if (!rsa->meth->bn_mod_exp(r0,&r1,rsa->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 (r0->neg)
		if (!BN_add(r0,r0,rsa->p)) goto err;

	if (!BN_mul(&r1,r0,rsa->iqmp,ctx)) goto err;
	if (!BN_mod(r0,&r1,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 (r0->neg)
		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;

	ret=1;
err:
	BN_clear_free(&m1);
	BN_clear_free(&r1);
	BN_CTX_free(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
Commit	Line	Data
58964a49 RE	1	/* crypto/rsa/rsa_eay.c */
	2	/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
	3	* All rights reserved.
	4	*
	5	* This package is an SSL implementation written
	6	* by Eric Young (eay@cryptsoft.com).
	7	* The implementation was written so as to conform with Netscapes SSL.
	8	*
	9	* This library is free for commercial and non-commercial use as long as
	10	* the following conditions are aheared to. The following conditions
	11	* apply to all code found in this distribution, be it the RC4, RSA,
	12	* lhash, DES, etc., code; not just the SSL code. The SSL documentation
	13	* included with this distribution is covered by the same copyright terms
	14	* except that the holder is Tim Hudson (tjh@cryptsoft.com).
	15	*
	16	* Copyright remains Eric Young's, and as such any Copyright notices in
	17	* the code are not to be removed.
	18	* If this package is used in a product, Eric Young should be given attribution
	19	* as the author of the parts of the library used.
	20	* This can be in the form of a textual message at program startup or
	21	* in documentation (online or textual) provided with the package.
	22	*
	23	* Redistribution and use in source and binary forms, with or without
	24	* modification, are permitted provided that the following conditions
	25	* are met:
	26	* 1. Redistributions of source code must retain the copyright
	27	* notice, this list of conditions and the following disclaimer.
	28	* 2. Redistributions in binary form must reproduce the above copyright
	29	* notice, this list of conditions and the following disclaimer in the
	30	* documentation and/or other materials provided with the distribution.
	31	* 3. All advertising materials mentioning features or use of this software
	32	* must display the following acknowledgement:
	33	* "This product includes cryptographic software written by
	34	* Eric Young (eay@cryptsoft.com)"
	35	* The word 'cryptographic' can be left out if the rouines from the library
	36	* being used are not cryptographic related :-).
	37	* 4. If you include any Windows specific code (or a derivative thereof) from
	38	* the apps directory (application code) you must include an acknowledgement:
	39	* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
	40	*
	41	* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
	42	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	43	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	44	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
	45	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	46	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	47	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	48	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	49	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	50	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	51	* SUCH DAMAGE.
	52	*
	53	* The licence and distribution terms for any publically available version or
	54	* derivative of this code cannot be changed. i.e. this code cannot simply be
	55	* copied and put under another distribution licence
	56	* [including the GNU Public Licence.]
	57	*/
	58
	59	#include <stdio.h>
	60	#include "cryptlib.h"
ec577822 BM	61	#include <openssl/bn.h>
	62	#include <openssl/rsa.h>
	63	#include <openssl/rand.h>
58964a49	64
c1cd88a0 DSH	65	#ifndef RSA_NULL
c1cd88a0 DSH	66
58964a49 RE	67	static int RSA_eay_public_encrypt(int flen, unsigned char *from,
	68	unsigned char to, RSA rsa,int padding);
	69	static int RSA_eay_private_encrypt(int flen, unsigned char *from,
	70	unsigned char to, RSA rsa,int padding);
	71	static int RSA_eay_public_decrypt(int flen, unsigned char *from,
	72	unsigned char to, RSA rsa,int padding);
	73	static int RSA_eay_private_decrypt(int flen, unsigned char *from,
	74	unsigned char to, RSA rsa,int padding);
	75	static int RSA_eay_mod_exp(BIGNUM r0, BIGNUM i, RSA *rsa);
	76	static int RSA_eay_init(RSA *rsa);
	77	static int RSA_eay_finish(RSA *rsa);
58964a49 RE	78	static RSA_METHOD rsa_pkcs1_eay_meth={
	79	"Eric Young's PKCS#1 RSA",
	80	RSA_eay_public_encrypt,
	81	RSA_eay_public_decrypt,
	82	RSA_eay_private_encrypt,
	83	RSA_eay_private_decrypt,
	84	RSA_eay_mod_exp,
	85	BN_mod_exp_mont,
	86	RSA_eay_init,
	87	RSA_eay_finish,
	88	0,
	89	NULL,
	90	};
	91
6b691a5c	92	RSA_METHOD *RSA_PKCS1_SSLeay(void)
58964a49 RE	93	{
	94	return(&rsa_pkcs1_eay_meth);
	95	}
	96
6b691a5c UM	97	static int RSA_eay_public_encrypt(int flen, unsigned char *from,
6b691a5c UM	98	unsigned char to, RSA rsa, int padding)
58964a49	99	{
dfeab068	100	BIGNUM f,ret;
58964a49 RE	101	int i,j,k,num=0,r= -1;
	102	unsigned char *buf=NULL;
	103	BN_CTX *ctx=NULL;
	104
dfeab068 RE	105	BN_init(&f);
dfeab068 RE	106	BN_init(&ret);
58964a49 RE	107	if ((ctx=BN_CTX_new()) == NULL) goto err;
58964a49 RE	108	num=BN_num_bytes(rsa->n);
26a3a48d	109	if ((buf=(unsigned char *)OPENSSL_malloc(num)) == NULL)
58964a49 RE	110	{
	111	RSAerr(RSA_F_RSA_EAY_PUBLIC_ENCRYPT,ERR_R_MALLOC_FAILURE);
	112	goto err;
	113	}
	114
	115	switch (padding)
	116	{
	117	case RSA_PKCS1_PADDING:
	118	i=RSA_padding_add_PKCS1_type_2(buf,num,from,flen);
	119	break;
79df9d62	120	#ifndef NO_SHA
a4949896 BL	121	case RSA_PKCS1_OAEP_PADDING:
	122	i=RSA_padding_add_PKCS1_OAEP(buf,num,from,flen,NULL,0);
	123	break;
79df9d62	124	#endif
58964a49 RE	125	case RSA_SSLV23_PADDING:
	126	i=RSA_padding_add_SSLv23(buf,num,from,flen);
	127	break;
	128	case RSA_NO_PADDING:
	129	i=RSA_padding_add_none(buf,num,from,flen);
	130	break;
	131	default:
	132	RSAerr(RSA_F_RSA_EAY_PUBLIC_ENCRYPT,RSA_R_UNKNOWN_PADDING_TYPE);
	133	goto err;
	134	}
	135	if (i <= 0) goto err;
	136
dfeab068	137	if (BN_bin2bn(buf,num,&f) == NULL) goto err;
58964a49	138
03f8b042	139	if ((rsa->_method_mod_n == NULL) && (rsa->flags & RSA_FLAG_CACHE_PUBLIC))
58964a49	140	{
03f8b042 BL	141	if ((rsa->_method_mod_n=BN_MONT_CTX_new()) != NULL)
	142	if (!BN_MONT_CTX_set(rsa->_method_mod_n,rsa->n,ctx))
	143	goto err;
58964a49 RE	144	}
58964a49 RE	145
dfeab068	146	if (!rsa->meth->bn_mod_exp(&ret,&f,rsa->e,rsa->n,ctx,
03f8b042	147	rsa->_method_mod_n)) goto err;
58964a49 RE	148
	149	/* put in leading 0 bytes if the number is less than the
	150	* length of the modulus */
dfeab068 RE	151	j=BN_num_bytes(&ret);
dfeab068 RE	152	i=BN_bn2bin(&ret,&(to[num-j]));
58964a49 RE	153	for (k=0; k<(num-i); k++)
	154	to[k]=0;
	155
	156	r=num;
	157	err:
	158	if (ctx != NULL) BN_CTX_free(ctx);
dfeab068 RE	159	BN_clear_free(&f);
dfeab068 RE	160	BN_clear_free(&ret);
58964a49 RE	161	if (buf != NULL)
	162	{
	163	memset(buf,0,num);
26a3a48d	164	OPENSSL_free(buf);
58964a49 RE	165	}
	166	return(r);
	167	}
	168
6b691a5c UM	169	static int RSA_eay_private_encrypt(int flen, unsigned char *from,
6b691a5c UM	170	unsigned char to, RSA rsa, int padding)
58964a49	171	{
dfeab068	172	BIGNUM f,ret;
58964a49 RE	173	int i,j,k,num=0,r= -1;
	174	unsigned char *buf=NULL;
	175	BN_CTX *ctx=NULL;
	176
dfeab068 RE	177	BN_init(&f);
	178	BN_init(&ret);
	179
58964a49 RE	180	if ((ctx=BN_CTX_new()) == NULL) goto err;
58964a49 RE	181	num=BN_num_bytes(rsa->n);
26a3a48d	182	if ((buf=(unsigned char *)OPENSSL_malloc(num)) == NULL)
58964a49 RE	183	{
	184	RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,ERR_R_MALLOC_FAILURE);
	185	goto err;
	186	}
	187
	188	switch (padding)
	189	{
	190	case RSA_PKCS1_PADDING:
	191	i=RSA_padding_add_PKCS1_type_1(buf,num,from,flen);
	192	break;
	193	case RSA_NO_PADDING:
	194	i=RSA_padding_add_none(buf,num,from,flen);
	195	break;
	196	case RSA_SSLV23_PADDING:
	197	default:
	198	RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,RSA_R_UNKNOWN_PADDING_TYPE);
	199	goto err;
	200	}
	201	if (i <= 0) goto err;
	202
dfeab068	203	if (BN_bin2bn(buf,num,&f) == NULL) goto err;
58964a49 RE	204
	205	if ((rsa->flags & RSA_FLAG_BLINDING) && (rsa->blinding == NULL))
	206	RSA_blinding_on(rsa,ctx);
	207	if (rsa->flags & RSA_FLAG_BLINDING)
dfeab068	208	if (!BN_BLINDING_convert(&f,rsa->blinding,ctx)) goto err;
58964a49	209
770d19b8 DSH	210	if ( (rsa->flags & RSA_FLAG_EXT_PKEY) \|\|
770d19b8 DSH	211	((rsa->p != NULL) &&
58964a49 RE	212	(rsa->q != NULL) &&
	213	(rsa->dmp1 != NULL) &&
	214	(rsa->dmq1 != NULL) &&
770d19b8	215	(rsa->iqmp != NULL)) )
dfeab068	216	{ if (!rsa->meth->rsa_mod_exp(&ret,&f,rsa)) goto err; }
58964a49 RE	217	else
58964a49 RE	218	{
dfeab068	219	if (!rsa->meth->bn_mod_exp(&ret,&f,rsa->d,rsa->n,ctx,NULL)) goto err;
58964a49 RE	220	}
	221
	222	if (rsa->flags & RSA_FLAG_BLINDING)
dfeab068	223	if (!BN_BLINDING_invert(&ret,rsa->blinding,ctx)) goto err;
58964a49 RE	224
	225	/* put in leading 0 bytes if the number is less than the
	226	* length of the modulus */
dfeab068 RE	227	j=BN_num_bytes(&ret);
dfeab068 RE	228	i=BN_bn2bin(&ret,&(to[num-j]));
58964a49 RE	229	for (k=0; k<(num-i); k++)
	230	to[k]=0;
	231
	232	r=num;
	233	err:
	234	if (ctx != NULL) BN_CTX_free(ctx);
dfeab068 RE	235	BN_clear_free(&ret);
dfeab068 RE	236	BN_clear_free(&f);
58964a49 RE	237	if (buf != NULL)
	238	{
	239	memset(buf,0,num);
26a3a48d	240	OPENSSL_free(buf);
58964a49 RE	241	}
	242	return(r);
	243	}
	244
6b691a5c UM	245	static int RSA_eay_private_decrypt(int flen, unsigned char *from,
6b691a5c UM	246	unsigned char to, RSA rsa, int padding)
58964a49	247	{
dfeab068	248	BIGNUM f,ret;
58964a49 RE	249	int j,num=0,r= -1;
	250	unsigned char *p;
	251	unsigned char *buf=NULL;
	252	BN_CTX *ctx=NULL;
	253
dfeab068 RE	254	BN_init(&f);
dfeab068 RE	255	BN_init(&ret);
58964a49 RE	256	ctx=BN_CTX_new();
	257	if (ctx == NULL) goto err;
	258
	259	num=BN_num_bytes(rsa->n);
	260
26a3a48d	261	if ((buf=(unsigned char *)OPENSSL_malloc(num)) == NULL)
58964a49 RE	262	{
	263	RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,ERR_R_MALLOC_FAILURE);
	264	goto err;
	265	}
	266
657e60fa	267	/* This check was for equality but PGP does evil things
58964a49 RE	268	* and chops off the top '0' bytes */
	269	if (flen > num)
	270	{
	271	RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,RSA_R_DATA_GREATER_THAN_MOD_LEN);
	272	goto err;
	273	}
	274
	275	/* make data into a big number */
dfeab068	276	if (BN_bin2bn(from,(int)flen,&f) == NULL) goto err;
58964a49 RE	277
	278	if ((rsa->flags & RSA_FLAG_BLINDING) && (rsa->blinding == NULL))
	279	RSA_blinding_on(rsa,ctx);
	280	if (rsa->flags & RSA_FLAG_BLINDING)
dfeab068	281	if (!BN_BLINDING_convert(&f,rsa->blinding,ctx)) goto err;
58964a49 RE	282
58964a49 RE	283	/* do the decrypt */
770d19b8 DSH	284	if ( (rsa->flags & RSA_FLAG_EXT_PKEY) \|\|
770d19b8 DSH	285	((rsa->p != NULL) &&
58964a49 RE	286	(rsa->q != NULL) &&
	287	(rsa->dmp1 != NULL) &&
	288	(rsa->dmq1 != NULL) &&
770d19b8	289	(rsa->iqmp != NULL)) )
dfeab068	290	{ if (!rsa->meth->rsa_mod_exp(&ret,&f,rsa)) goto err; }
58964a49 RE	291	else
58964a49 RE	292	{
dfeab068	293	if (!rsa->meth->bn_mod_exp(&ret,&f,rsa->d,rsa->n,ctx,NULL))
58964a49 RE	294	goto err;
	295	}
	296
	297	if (rsa->flags & RSA_FLAG_BLINDING)
dfeab068	298	if (!BN_BLINDING_invert(&ret,rsa->blinding,ctx)) goto err;
58964a49 RE	299
58964a49 RE	300	p=buf;
dfeab068	301	j=BN_bn2bin(&ret,p); /* j is only used with no-padding mode */
58964a49 RE	302
	303	switch (padding)
	304	{
	305	case RSA_PKCS1_PADDING:
dfeab068	306	r=RSA_padding_check_PKCS1_type_2(to,num,buf,j,num);
58964a49	307	break;
79df9d62	308	#ifndef NO_SHA
a4949896 BL	309	case RSA_PKCS1_OAEP_PADDING:
	310	r=RSA_padding_check_PKCS1_OAEP(to,num,buf,j,num,NULL,0);
	311	break;
79df9d62	312	#endif
a4949896	313	case RSA_SSLV23_PADDING:
dfeab068	314	r=RSA_padding_check_SSLv23(to,num,buf,j,num);
58964a49 RE	315	break;
58964a49 RE	316	case RSA_NO_PADDING:
dfeab068	317	r=RSA_padding_check_none(to,num,buf,j,num);
58964a49 RE	318	break;
	319	default:
	320	RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,RSA_R_UNKNOWN_PADDING_TYPE);
	321	goto err;
	322	}
	323	if (r < 0)
	324	RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,RSA_R_PADDING_CHECK_FAILED);
	325
	326	err:
	327	if (ctx != NULL) BN_CTX_free(ctx);
dfeab068 RE	328	BN_clear_free(&f);
dfeab068 RE	329	BN_clear_free(&ret);
58964a49 RE	330	if (buf != NULL)
	331	{
	332	memset(buf,0,num);
26a3a48d	333	OPENSSL_free(buf);
58964a49 RE	334	}
	335	return(r);
	336	}
	337
6b691a5c UM	338	static int RSA_eay_public_decrypt(int flen, unsigned char *from,
6b691a5c UM	339	unsigned char to, RSA rsa, int padding)
58964a49	340	{
dfeab068	341	BIGNUM f,ret;
58964a49 RE	342	int i,num=0,r= -1;
	343	unsigned char *p;
	344	unsigned char *buf=NULL;
	345	BN_CTX *ctx=NULL;
	346
dfeab068 RE	347	BN_init(&f);
dfeab068 RE	348	BN_init(&ret);
58964a49 RE	349	ctx=BN_CTX_new();
	350	if (ctx == NULL) goto err;
	351
	352	num=BN_num_bytes(rsa->n);
26a3a48d	353	buf=(unsigned char *)OPENSSL_malloc(num);
58964a49 RE	354	if (buf == NULL)
	355	{
	356	RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,ERR_R_MALLOC_FAILURE);
	357	goto err;
	358	}
	359
657e60fa	360	/* This check was for equality but PGP does evil things
58964a49 RE	361	* and chops off the top '0' bytes */
	362	if (flen > num)
	363	{
	364	RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,RSA_R_DATA_GREATER_THAN_MOD_LEN);
	365	goto err;
	366	}
	367
dfeab068	368	if (BN_bin2bn(from,flen,&f) == NULL) goto err;
58964a49	369	/* do the decrypt */
03f8b042	370	if ((rsa->_method_mod_n == NULL) && (rsa->flags & RSA_FLAG_CACHE_PUBLIC))
58964a49	371	{
03f8b042 BL	372	if ((rsa->_method_mod_n=BN_MONT_CTX_new()) != NULL)
	373	if (!BN_MONT_CTX_set(rsa->_method_mod_n,rsa->n,ctx))
	374	goto err;
58964a49 RE	375	}
58964a49 RE	376
dfeab068	377	if (!rsa->meth->bn_mod_exp(&ret,&f,rsa->e,rsa->n,ctx,
03f8b042	378	rsa->_method_mod_n)) goto err;
58964a49 RE	379
58964a49 RE	380	p=buf;
dfeab068	381	i=BN_bn2bin(&ret,p);
58964a49 RE	382
	383	switch (padding)
	384	{
	385	case RSA_PKCS1_PADDING:
dfeab068	386	r=RSA_padding_check_PKCS1_type_1(to,num,buf,i,num);
58964a49 RE	387	break;
58964a49 RE	388	case RSA_NO_PADDING:
dfeab068	389	r=RSA_padding_check_none(to,num,buf,i,num);
58964a49 RE	390	break;
	391	default:
	392	RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,RSA_R_UNKNOWN_PADDING_TYPE);
	393	goto err;
	394	}
	395	if (r < 0)
	396	RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,RSA_R_PADDING_CHECK_FAILED);
	397
	398	err:
	399	if (ctx != NULL) BN_CTX_free(ctx);
dfeab068 RE	400	BN_clear_free(&f);
dfeab068 RE	401	BN_clear_free(&ret);
58964a49 RE	402	if (buf != NULL)
	403	{
	404	memset(buf,0,num);
26a3a48d	405	OPENSSL_free(buf);
58964a49 RE	406	}
	407	return(r);
	408	}
	409
6b691a5c	410	static int RSA_eay_mod_exp(BIGNUM r0, BIGNUM I, RSA *rsa)
58964a49	411	{
dfeab068	412	BIGNUM r1,m1;
58964a49 RE	413	int ret=0;
	414	BN_CTX *ctx;
	415
	416	if ((ctx=BN_CTX_new()) == NULL) goto err;
dfeab068 RE	417	BN_init(&m1);
dfeab068 RE	418	BN_init(&r1);
58964a49 RE	419
	420	if (rsa->flags & RSA_FLAG_CACHE_PRIVATE)
	421	{
03f8b042	422	if (rsa->_method_mod_p == NULL)
58964a49	423	{
03f8b042 BL	424	if ((rsa->_method_mod_p=BN_MONT_CTX_new()) != NULL)
	425	if (!BN_MONT_CTX_set(rsa->_method_mod_p,rsa->p,
	426	ctx))
58964a49 RE	427	goto err;
58964a49 RE	428	}
03f8b042	429	if (rsa->_method_mod_q == NULL)
58964a49	430	{
03f8b042 BL	431	if ((rsa->_method_mod_q=BN_MONT_CTX_new()) != NULL)
	432	if (!BN_MONT_CTX_set(rsa->_method_mod_q,rsa->q,
	433	ctx))
58964a49 RE	434	goto err;
	435	}
	436	}
	437
dfeab068 RE	438	if (!BN_mod(&r1,I,rsa->q,ctx)) goto err;
dfeab068 RE	439	if (!rsa->meth->bn_mod_exp(&m1,&r1,rsa->dmq1,rsa->q,ctx,
03f8b042	440	rsa->_method_mod_q)) goto err;
58964a49	441
dfeab068 RE	442	if (!BN_mod(&r1,I,rsa->p,ctx)) goto err;
dfeab068 RE	443	if (!rsa->meth->bn_mod_exp(r0,&r1,rsa->dmp1,rsa->p,ctx,
03f8b042	444	rsa->_method_mod_p)) goto err;
58964a49	445
dfeab068 RE	446	if (!BN_sub(r0,r0,&m1)) goto err;
	447	/* This will help stop the size of r0 increasing, which does
	448	* affect the multiply if it optimised for a power of 2 size */
	449	if (r0->neg)
	450	if (!BN_add(r0,r0,rsa->p)) goto err;
58964a49	451
dfeab068 RE	452	if (!BN_mul(&r1,r0,rsa->iqmp,ctx)) goto err;
dfeab068 RE	453	if (!BN_mod(r0,&r1,rsa->p,ctx)) goto err;
abd4c915 DSH	454	/* If p < q it is occasionally possible for the correction of
	455	* adding 'p' if r0 is negative above to leave the result still
	456	* negative. This can break the private key operations: the following
	457	* second correction should always correct this rare occurrence.
	458	* This will never happen with OpenSSL generated keys because
	459	* they ensure p > q [steve]
	460	*/
	461	if (r0->neg)
	462	if (!BN_add(r0,r0,rsa->p)) goto err;
dfeab068 RE	463	if (!BN_mul(&r1,r0,rsa->q,ctx)) goto err;
dfeab068 RE	464	if (!BN_add(r0,&r1,&m1)) goto err;
58964a49 RE	465
	466	ret=1;
	467	err:
dfeab068 RE	468	BN_clear_free(&m1);
dfeab068 RE	469	BN_clear_free(&r1);
e03ddfae	470	BN_CTX_free(ctx);
58964a49 RE	471	return(ret);
	472	}
	473
6b691a5c	474	static int RSA_eay_init(RSA *rsa)
58964a49 RE	475	{
	476	rsa->flags\|=RSA_FLAG_CACHE_PUBLIC\|RSA_FLAG_CACHE_PRIVATE;
	477	return(1);
	478	}
	479
6b691a5c	480	static int RSA_eay_finish(RSA *rsa)
58964a49	481	{
03f8b042 BL	482	if (rsa->_method_mod_n != NULL)
	483	BN_MONT_CTX_free(rsa->_method_mod_n);
	484	if (rsa->_method_mod_p != NULL)
	485	BN_MONT_CTX_free(rsa->_method_mod_p);
	486	if (rsa->_method_mod_q != NULL)
	487	BN_MONT_CTX_free(rsa->_method_mod_q);
58964a49 RE	488	return(1);
	489	}
	490
c1cd88a0	491	#endif