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/*-
* Copyright (c) 2017-2021 Ribose Inc.
* Copyright (c) 2012 Alistair Crooks <agc@NetBSD.org>
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
*/
#ifndef RNP_BN_H_
#define RNP_BN_H_
#include <stdio.h>
#include <stdint.h>
#include "config.h"
#include "mpi.h"
#if defined(CRYPTO_BACKEND_OPENSSL)
#include <openssl/bn.h>
#define bignum_t BIGNUM
#elif defined(CRYPTO_BACKEND_BOTAN)
typedef struct botan_mp_struct *botan_mp_t;
typedef struct bignum_t_st {
botan_mp_t mp;
} bignum_t;
#define BN_HANDLE(x) ((x).mp)
#define BN_HANDLE_PTR(x) ((x)->mp)
#else
#error "Unknown crypto backend."
#endif
/*********************************/
bignum_t *bn_new(void);
void bn_free(bignum_t * /*a*/);
int bn_bn2bin(const bignum_t * /*a*/, unsigned char * /*b*/);
bignum_t *mpi2bn(const pgp_mpi_t *val);
bool bn2mpi(const bignum_t *bn, pgp_mpi_t *val);
size_t bn_num_bytes(const bignum_t &a);
#if defined(CRYPTO_BACKEND_OPENSSL)
namespace rnp {
class bn {
BIGNUM *_bn;
public:
bn(BIGNUM *val = NULL) : _bn(val)
{
}
bn(const pgp_mpi_t &val) : _bn(mpi2bn(&val))
{
}
~bn()
{
BN_free(_bn);
}
void
set(BIGNUM *val = NULL) noexcept
{
BN_free(_bn);
_bn = val;
}
void
set(const pgp_mpi_t &val) noexcept
{
BN_free(_bn);
_bn = mpi2bn(&val);
}
BIGNUM **
ptr() noexcept
{
set();
return &_bn;
}
BIGNUM *
get() noexcept
{
return _bn;
}
BIGNUM *
own() noexcept
{
auto res = _bn;
_bn = NULL;
return res;
}
size_t
bytes() const noexcept
{
return BN_num_bytes(_bn);
}
bool
bin(uint8_t *b) const noexcept
{
if (!b) {
return false;
}
return BN_bn2bin(_bn, b) >= 0;
}
bool
mpi(pgp_mpi_t &mpi) const noexcept
{
return bn2mpi(_bn, &mpi);
}
};
}; // namespace rnp
#endif
#endif
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