=pod =head1 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. =head1 SYNOPSIS #include 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); 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); Deprecated: #if OPENSSL_API_COMPAT < 0x10000000L unsigned long BN_BLINDING_get_thread_id(const BN_BLINDING *); void BN_BLINDING_set_thread_id(BN_BLINDING *, unsigned long); #endif =head1 DESCRIPTION BN_BLINDING_new() allocates a new B structure and copies the B and B values into the newly created B object. BN_BLINDING_free() frees the B structure. If B is NULL, nothing is done. BN_BLINDING_update() updates the B parameters by squaring the B and B or, after specific number of uses and if the necessary parameters are set, by re-creating the blinding parameters. BN_BLINDING_convert_ex() multiplies B with the blinding factor B. If B is not NULL a copy the inverse blinding factor B will be returned in B (this is useful if a B object is shared among several threads). BN_BLINDING_invert_ex() multiplies B with the inverse blinding factor B. If B 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 B set to NULL. BN_BLINDING_thread_id() provides access to the B object within the B structure. This is to help users provide proper locking if needed for multi-threaded use. The "thread id" object of a newly allocated B 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: B and B. B inhibits the automatic update of the B parameters after each use and B inhibits the automatic re-creation of the B parameters after a fixed number of uses (currently 32). In newly allocated B objects no flags are set. BN_BLINDING_set_flags() sets the B parameters flags. BN_BLINDING_create_param() creates new B parameters using the exponent B and the modulus B. B and B can be used to pass special functions for exponentiation (normally BN_mod_exp_mont() and B). =head1 RETURN VALUES BN_BLINDING_new() returns the newly allocated B 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_thread_id() returns a pointer to the thread id object within a B object. BN_BLINDING_get_flags() returns the currently set B flags (a B value). BN_BLINDING_create_param() returns the newly created B parameters or NULL on error. =head1 SEE ALSO L =head1 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(). =cut