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BN_BLINDING_NEW(3)		    OpenSSL		    BN_BLINDING_NEW(3)

NAME
       BN_BLINDING_new,	BN_BLINDING_free, BN_BLINDING_update,
       BN_BLINDING_convert, BN_BLINDING_invert,	BN_BLINDING_convert_ex,
       BN_BLINDING_invert_ex, BN_BLINDING_is_current_thread,
       BN_BLINDING_set_current_thread, BN_BLINDING_lock, BN_BLINDING_unlock,
       BN_BLINDING_get_flags, BN_BLINDING_set_flags, BN_BLINDING_create_param
       - blinding related BIGNUM functions

SYNOPSIS
	#include <openssl/bn.h>

	BN_BLINDING *BN_BLINDING_new(const BIGNUM *A, const BIGNUM *Ai,
				     BIGNUM *mod);
	void BN_BLINDING_free(BN_BLINDING *b);
	int BN_BLINDING_update(BN_BLINDING *b, BN_CTX *ctx);
	int BN_BLINDING_convert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx);
	int BN_BLINDING_invert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx);
	int BN_BLINDING_convert_ex(BIGNUM *n, BIGNUM *r, BN_BLINDING *b,
				   BN_CTX *ctx);
	int BN_BLINDING_invert_ex(BIGNUM *n, const BIGNUM *r, BN_BLINDING *b,
				  BN_CTX *ctx);
	int BN_BLINDING_is_current_thread(BN_BLINDING *b);
	void BN_BLINDING_set_current_thread(BN_BLINDING	*b);
	int BN_BLINDING_lock(BN_BLINDING *b);
	int BN_BLINDING_unlock(BN_BLINDING *b);
	unsigned long BN_BLINDING_get_flags(const BN_BLINDING *);
	void BN_BLINDING_set_flags(BN_BLINDING *, unsigned long);
	BN_BLINDING *BN_BLINDING_create_param(BN_BLINDING *b,
					      const BIGNUM *e, BIGNUM *m, BN_CTX *ctx,
					      int (*bn_mod_exp)(BIGNUM *r,
								const BIGNUM *a,
								const BIGNUM *p,
								const BIGNUM *m,
								BN_CTX *ctx,
								BN_MONT_CTX *m_ctx),
					      BN_MONT_CTX *m_ctx);

DESCRIPTION
       BN_BLINDING_new() allocates a new BN_BLINDING structure and copies the
       A and Ai	values into the	newly created BN_BLINDING object.

       BN_BLINDING_free() frees	the BN_BLINDING	structure.  If b is NULL,
       nothing is done.

       BN_BLINDING_update() updates the	BN_BLINDING parameters by squaring the
       A and Ai	or, after specific number of uses and if the necessary
       parameters are set, by re-creating the blinding parameters.

       BN_BLINDING_convert_ex()	multiplies n with the blinding factor A.  If r
       is not NULL a copy the inverse blinding factor Ai will be returned in r
       (this is	useful if a RSA	object is shared among several threads).
       BN_BLINDING_invert_ex() multiplies n with the inverse blinding factor
       Ai. If r	is not NULL it will be used as the inverse blinding.

       BN_BLINDING_convert() and BN_BLINDING_invert() are wrapper functions
       for BN_BLINDING_convert_ex() and	BN_BLINDING_invert_ex()	with r set to
       NULL.

       BN_BLINDING_is_current_thread() returns whether the BN_BLINDING
       structure is owned by the current thread. This is to help users provide
       proper locking if needed	for multi-threaded use.

       BN_BLINDING_set_current_thread()	sets the current thread	as the owner
       of the BN_BLINDING structure.

       BN_BLINDING_lock() locks	the BN_BLINDING	structure.

       BN_BLINDING_unlock() unlocks the	BN_BLINDING structure.

       BN_BLINDING_get_flags() returns the BN_BLINDING flags. Currently	there
       are two supported flags:	BN_BLINDING_NO_UPDATE and
       BN_BLINDING_NO_RECREATE.	BN_BLINDING_NO_UPDATE inhibits the automatic
       update of the BN_BLINDING parameters after each use and
       BN_BLINDING_NO_RECREATE inhibits	the automatic re-creation of the
       BN_BLINDING parameters after a fixed number of uses (currently 32). In
       newly allocated BN_BLINDING objects no flags are	set.
       BN_BLINDING_set_flags() sets the	BN_BLINDING parameters flags.

       BN_BLINDING_create_param() creates new BN_BLINDING parameters using the
       exponent	e and the modulus m. bn_mod_exp	and m_ctx can be used to pass
       special functions for exponentiation (normally BN_mod_exp_mont()	and
       BN_MONT_CTX).

RETURN VALUES
       BN_BLINDING_new() returns the newly allocated BN_BLINDING structure or
       NULL in case of an error.

       BN_BLINDING_update(), BN_BLINDING_convert(), BN_BLINDING_invert(),
       BN_BLINDING_convert_ex()	and BN_BLINDING_invert_ex() return 1 on
       success and 0 if	an error occurred.

       BN_BLINDING_is_current_thread() returns 1 if the	current	thread owns
       the BN_BLINDING object, 0 otherwise.

       BN_BLINDING_set_current_thread()	doesn't	return anything.

       BN_BLINDING_lock(), BN_BLINDING_unlock()	return 1 if the	operation
       succeeded or 0 on error.

       BN_BLINDING_get_flags() returns the currently set BN_BLINDING flags (a
       unsigned	long value).

       BN_BLINDING_create_param() returns the newly created BN_BLINDING
       parameters or NULL on error.

HISTORY
       BN_BLINDING_thread_id() was first introduced in OpenSSL 1.0.0, and it
       deprecates BN_BLINDING_set_thread_id() and BN_BLINDING_get_thread_id().

COPYRIGHT
       Copyright 2005-2017 The OpenSSL Project Authors.	All Rights Reserved.

       Licensed	under the OpenSSL license (the "License").  You	may not	use
       this file except	in compliance with the License.	 You can obtain	a copy
       in the file LICENSE in the source distribution or at
       <https://www.openssl.org/source/license.html>.

1.1.1a				  2018-11-20		    BN_BLINDING_NEW(3)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | HISTORY | COPYRIGHT

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