BN_BLINDING_NEW(3) BSD Library Functions Manual 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_get_thread_id,
BN_BLINDING_set_thread_id, BN_BLINDING_thread_id, 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);
#ifndef OPENSSL_NO_DEPRECATED
unsigned long
BN_BLINDING_get_thread_id(const BN_BLINDING *);
void
BN_BLINDING_set_thread_id(BN_BLINDING *, unsigned long);
#endif
CRYPTO_THREADID *
BN_BLINDING_thread_id(BN_BLINDING *);
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);
DESCRIPTIONBN_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.
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 of 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_thread_id() provides access to the CRYPTO_THREADID object
within the BN_BLINDING structure. This is to help users provide proper
locking if needed for multi-threaded use. The "thread id" object of a
newly allocated BN_BLINDING structure is initialised to the thread id in
which BN_BLINDING_new() was called.
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(3) and
BN_MONT_CTX).
RETURN VALUESBN_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 occured.
BN_BLINDING_thread_id() returns a pointer to the thread id object within
a BN_BLINDING object.
BN_BLINDING_get_flags() returns the currently set BN_BLINDING_* flags (an
unsigned long value).
BN_BLINDING_create_param() returns the newly created BN_BLINDING parame‐
ters or NULL on error.
SEE ALSObn(3)HISTORYBN_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().
BN_BLINDING_convert_ex(), BN_BLINDIND_invert_ex(),
BN_BLINDING_get_thread_id(), BN_BLINDING_set_thread_id(),
BN_BLINDING_set_flags(), BN_BLINDING_get_flags() and
BN_BLINDING_create_param() were first introduced in OpenSSL 0.9.8
AUTHORS
Nils Larsch for the OpenSSL project: http://www.openssl.org/.
BSD May 13, 2024 BSD