/* bn.h
 *
 * Copyright (C) 2006-2019 wolfSSL Inc.
 *
 * This file is part of wolfSSL.
 *
 * wolfSSL is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * wolfSSL is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
 */

/* bn.h for openssl */

/*!
    \file wolfssl/openssl/bn.h
    \brief bn.h for openssl
*/


#ifndef WOLFSSL_BN_H_
#define WOLFSSL_BN_H_

#include <wolfssl/wolfcrypt/settings.h>
#include <wolfssl/wolfcrypt/integer.h>

#ifdef __cplusplus
    extern "C" {
#endif

typedef struct WOLFSSL_BIGNUM {
    int neg;        /* openssh deference */
    void *internal; /* our big num */
#ifdef WOLFSSL_SP_MATH
    sp_int fp;
#elif defined(USE_FAST_MATH) && !defined(HAVE_WOLF_BIGINT)
    fp_int fp;
#endif
} WOLFSSL_BIGNUM;


#define WOLFSSL_BN_ULONG mp_digit

typedef struct WOLFSSL_BN_CTX WOLFSSL_BN_CTX;
typedef struct WOLFSSL_BN_GENCB WOLFSSL_BN_GENCB;

WOLFSSL_API WOLFSSL_BN_CTX* wolfSSL_BN_CTX_new(void);
WOLFSSL_API void           wolfSSL_BN_CTX_init(WOLFSSL_BN_CTX*);
WOLFSSL_API void           wolfSSL_BN_CTX_free(WOLFSSL_BN_CTX*);

WOLFSSL_API WOLFSSL_BIGNUM* wolfSSL_BN_new(void);
#if defined(USE_FAST_MATH) && !defined(HAVE_WOLF_BIGINT)
WOLFSSL_API void           wolfSSL_BN_init(WOLFSSL_BIGNUM *);
#endif
WOLFSSL_API void           wolfSSL_BN_free(WOLFSSL_BIGNUM*);
WOLFSSL_API void           wolfSSL_BN_clear_free(WOLFSSL_BIGNUM*);


WOLFSSL_API int wolfSSL_BN_sub(WOLFSSL_BIGNUM*, const WOLFSSL_BIGNUM*,
                             const WOLFSSL_BIGNUM*);
WOLFSSL_API int wolfSSL_BN_mod(WOLFSSL_BIGNUM*, const WOLFSSL_BIGNUM*,
                             const WOLFSSL_BIGNUM*, const WOLFSSL_BN_CTX*);
WOLFSSL_API int wolfSSL_BN_mod_exp(WOLFSSL_BIGNUM *r, const WOLFSSL_BIGNUM *a,
        const WOLFSSL_BIGNUM *p, const WOLFSSL_BIGNUM *m, WOLFSSL_BN_CTX *ctx);
WOLFSSL_API int wolfSSL_BN_mod_mul(WOLFSSL_BIGNUM *r, const WOLFSSL_BIGNUM *a,
        const WOLFSSL_BIGNUM *b, const WOLFSSL_BIGNUM *m, WOLFSSL_BN_CTX *ctx);
WOLFSSL_API const WOLFSSL_BIGNUM* wolfSSL_BN_value_one(void);


WOLFSSL_API int wolfSSL_BN_num_bytes(const WOLFSSL_BIGNUM*);
WOLFSSL_API int wolfSSL_BN_num_bits(const WOLFSSL_BIGNUM*);

WOLFSSL_API int wolfSSL_BN_is_zero(const WOLFSSL_BIGNUM*);
WOLFSSL_API int wolfSSL_BN_is_one(const WOLFSSL_BIGNUM*);
WOLFSSL_API int wolfSSL_BN_is_odd(const WOLFSSL_BIGNUM*);

WOLFSSL_API int wolfSSL_BN_cmp(const WOLFSSL_BIGNUM*, const WOLFSSL_BIGNUM*);

WOLFSSL_API int wolfSSL_BN_bn2bin(const WOLFSSL_BIGNUM*, unsigned char*);
WOLFSSL_API WOLFSSL_BIGNUM* wolfSSL_BN_bin2bn(const unsigned char*, int len,
                                WOLFSSL_BIGNUM* ret);

WOLFSSL_API int wolfSSL_mask_bits(WOLFSSL_BIGNUM*, int n);

WOLFSSL_API int wolfSSL_BN_pseudo_rand(WOLFSSL_BIGNUM*, int bits, int top,
        int bottom);
WOLFSSL_API int wolfSSL_BN_rand(WOLFSSL_BIGNUM*, int bits, int top, int bottom);
WOLFSSL_API int wolfSSL_BN_is_bit_set(const WOLFSSL_BIGNUM*, int n);
WOLFSSL_API int wolfSSL_BN_hex2bn(WOLFSSL_BIGNUM**, const char* str);

WOLFSSL_API WOLFSSL_BIGNUM* wolfSSL_BN_dup(const WOLFSSL_BIGNUM*);
WOLFSSL_API WOLFSSL_BIGNUM* wolfSSL_BN_copy(WOLFSSL_BIGNUM*,
                                            const WOLFSSL_BIGNUM*);

WOLFSSL_API int   wolfSSL_BN_dec2bn(WOLFSSL_BIGNUM**, const char* str);
WOLFSSL_API char* wolfSSL_BN_bn2dec(const WOLFSSL_BIGNUM*);

WOLFSSL_API int wolfSSL_BN_lshift(WOLFSSL_BIGNUM*, const WOLFSSL_BIGNUM*, int);
WOLFSSL_API int wolfSSL_BN_add_word(WOLFSSL_BIGNUM*, WOLFSSL_BN_ULONG);
WOLFSSL_API int wolfSSL_BN_set_bit(WOLFSSL_BIGNUM*, int);
WOLFSSL_API int wolfSSL_BN_set_word(WOLFSSL_BIGNUM*, WOLFSSL_BN_ULONG);
WOLFSSL_API unsigned long wolfSSL_BN_get_word(const WOLFSSL_BIGNUM*);

WOLFSSL_API int wolfSSL_BN_add(WOLFSSL_BIGNUM*, WOLFSSL_BIGNUM*,
                               WOLFSSL_BIGNUM*);
WOLFSSL_API char *wolfSSL_BN_bn2hex(const WOLFSSL_BIGNUM*);
WOLFSSL_API int wolfSSL_BN_is_prime_ex(const WOLFSSL_BIGNUM*, int,
                                       WOLFSSL_BN_CTX*, WOLFSSL_BN_GENCB*);
WOLFSSL_API WOLFSSL_BN_ULONG wolfSSL_BN_mod_word(const WOLFSSL_BIGNUM*,
                                                 WOLFSSL_BN_ULONG);
#if !defined(NO_FILESYSTEM) && !defined(NO_STDIO_FILESYSTEM)
    WOLFSSL_API int wolfSSL_BN_print_fp(XFILE, const WOLFSSL_BIGNUM*);
#endif
WOLFSSL_API int wolfSSL_BN_rshift(WOLFSSL_BIGNUM*, const WOLFSSL_BIGNUM*, int);
WOLFSSL_API WOLFSSL_BIGNUM *wolfSSL_BN_CTX_get(WOLFSSL_BN_CTX *ctx);
WOLFSSL_API void wolfSSL_BN_CTX_start(WOLFSSL_BN_CTX *ctx);
WOLFSSL_API WOLFSSL_BIGNUM *wolfSSL_BN_mod_inverse(WOLFSSL_BIGNUM*, WOLFSSL_BIGNUM*,
                                        const WOLFSSL_BIGNUM*, WOLFSSL_BN_CTX *ctx);
typedef WOLFSSL_BIGNUM BIGNUM;
typedef WOLFSSL_BN_CTX BN_CTX;
typedef WOLFSSL_BN_GENCB BN_GENCB;

#define BN_CTX_new        wolfSSL_BN_CTX_new
#define BN_CTX_init       wolfSSL_BN_CTX_init
#define BN_CTX_free       wolfSSL_BN_CTX_free

#define BN_new        wolfSSL_BN_new
#define BN_init       wolfSSL_BN_init
#define BN_free       wolfSSL_BN_free
#define BN_clear_free wolfSSL_BN_clear_free

#define BN_num_bytes wolfSSL_BN_num_bytes
#define BN_num_bits  wolfSSL_BN_num_bits

#define BN_is_zero  wolfSSL_BN_is_zero
#define BN_is_one   wolfSSL_BN_is_one
#define BN_is_odd   wolfSSL_BN_is_odd

#define BN_cmp    wolfSSL_BN_cmp

#define BN_bn2bin  wolfSSL_BN_bn2bin
#define BN_bin2bn  wolfSSL_BN_bin2bn

#define BN_mod       wolfSSL_BN_mod
#define BN_mod_exp   wolfSSL_BN_mod_exp
#define BN_mod_mul   wolfSSL_BN_mod_mul
#define BN_sub       wolfSSL_BN_sub
#define BN_value_one wolfSSL_BN_value_one

#define BN_mask_bits wolfSSL_mask_bits

#define BN_pseudo_rand wolfSSL_BN_pseudo_rand
#define BN_rand        wolfSSL_BN_rand
#define BN_is_bit_set  wolfSSL_BN_is_bit_set
#define BN_hex2bn      wolfSSL_BN_hex2bn

#define BN_dup  wolfSSL_BN_dup
#define BN_copy wolfSSL_BN_copy

#define BN_get_word wolfSSL_BN_get_word
#define BN_set_word wolfSSL_BN_set_word

#define BN_dec2bn wolfSSL_BN_dec2bn
#define BN_bn2dec wolfSSL_BN_bn2dec
#define BN_bn2hex wolfSSL_BN_bn2hex

#define BN_lshift wolfSSL_BN_lshift
#define BN_add_word wolfSSL_BN_add_word
#define BN_add wolfSSL_BN_add
#define BN_set_word wolfSSL_BN_set_word
#define BN_set_bit wolfSSL_BN_set_bit


#define BN_is_prime_ex wolfSSL_BN_is_prime_ex
#define BN_print_fp wolfSSL_BN_print_fp
#define BN_rshift wolfSSL_BN_rshift
#define BN_mod_word wolfSSL_BN_mod_word

#define BN_CTX_get wolfSSL_BN_CTX_get
#define BN_CTX_start wolfSSL_BN_CTX_start

#define BN_mod_inverse wolfSSL_BN_mod_inverse

#ifdef __cplusplus
    }  /* extern "C" */
#endif


#endif /* WOLFSSL__H_ */
