/**
  * \file rsa.h
  * \brief RSA functions
  */
/* crypto/rsa/rsa.h */
/* 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.]
 */

#ifndef HEADER_RSA_H
#define HEADER_RSA_H

#include "bn/bn.h"
#include "crypto_stub.h"

#define RSA_PKCS_V15    0
#define RSA_SIGN        1

#define ASN1_HASH_SHA1				\
	"\x30\x21\x30\x09\x06\x05\x2B\x0E\x03"	\
	"\x02\x1A\x05\x00\x04\x14"

#define ASN1_HASH_SHA256			\
	"\x30\x31\x30\x0D\x06\x09\x60\x86\x48"	\
	"\x01\x65\x03\x04\x02\x01\x05\x00\x04"	\
	"\x20"

#define ASN1_HASH_SHA512			\
	"\x30\x51\x30\x0D\x06\x09\x60\x86\x48"	\
	"\x01\x65\x03\x04\x02\x03\x05\x00\x04"	\
	"\x40"

struct rsa_st
{
	BIGNUM *n;
	BIGNUM *e;
	BIGNUM *d;
	BIGNUM *p;
	BIGNUM *q;
	BIGNUM *dmp1;
	BIGNUM *dmq1;
	BIGNUM *iqmp;

	int flags;
};

typedef struct rsa_st RSA;
typedef struct rsa_st rsa_context;

#define RSA_FLAG_NO_CONSTTIME		0x0100

unsigned long rsa_get_exponent(void);
void rsa_set_exponent(unsigned long exp);

RSA *RSA_new(void);
void RSA_free(RSA *r);

int generate_RSA_key(RSA *rsa, int bits, unsigned long e);
/* rsa_gen_key is a wrapper for generate_RSA_key */
int rsa_gen_key_mldap(RSA *rsa, int bits, unsigned long e);

int rsa_pkcs1_sign_mldap(RSA *rsa, int hash_id, int hashlen, unsigned char *hash, unsigned char *sig);
int rsa_pkcs1_verify_mldap(RSA *rsa, int hash_id, int hashlen, unsigned char *hash, unsigned char *sig);
int rsa_check_keypair(RSA *rsa);

#endif /* HEADER_RSA_H */