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Title "BN_BLINDING_NEW 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
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 Header "SYNOPSIS" .Vb 1 #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 *b); void BN_BLINDING_set_flags(BN_BLINDING *b, unsigned long flags); 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); .Ve Header "DESCRIPTION" \fBBN_BLINDING_new() allocates a new \s-1BN_BLINDING\s0 structure and copies the A and Ai values into the newly created \s-1BN_BLINDING\s0 object.

\fBBN_BLINDING_free() frees the \s-1BN_BLINDING\s0 structure. If b is \s-1NULL,\s0 nothing is done.

\fBBN_BLINDING_update() updates the \s-1BN_BLINDING\s0 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.

\fBBN_BLINDING_convert_ex() multiplies n with the blinding factor A. If r is not \s-1NULL\s0 a copy the inverse blinding factor Ai will be returned in r (this is useful if a \s-1RSA\s0 object is shared among several threads). BN_BLINDING_invert_ex() multiplies n with the inverse blinding factor Ai. If r is not \s-1NULL\s0 it will be used as the inverse blinding.

\fBBN_BLINDING_convert() and BN_BLINDING_invert() are wrapper functions for BN_BLINDING_convert_ex() and BN_BLINDING_invert_ex() with r set to \s-1NULL.\s0

\fBBN_BLINDING_is_current_thread() returns whether the \s-1BN_BLINDING\s0 structure is owned by the current thread. This is to help users provide proper locking if needed for multi-threaded use.

\fBBN_BLINDING_set_current_thread() sets the current thread as the owner of the \s-1BN_BLINDING\s0 structure.

\fBBN_BLINDING_lock() locks the \s-1BN_BLINDING\s0 structure.

\fBBN_BLINDING_unlock() unlocks the \s-1BN_BLINDING\s0 structure.

\fBBN_BLINDING_get_flags() returns the \s-1BN_BLINDING\s0 flags. Currently there are two supported flags: \s-1BN_BLINDING_NO_UPDATE\s0 and \fB\s-1BN_BLINDING_NO_RECREATE\s0. \s-1BN_BLINDING_NO_UPDATE\s0 inhibits the automatic update of the \s-1BN_BLINDING\s0 parameters after each use and \s-1BN_BLINDING_NO_RECREATE\s0 inhibits the automatic re-creation of the \s-1BN_BLINDING\s0 parameters after a fixed number of uses (currently 32). In newly allocated \s-1BN_BLINDING\s0 objects no flags are set. \fBBN_BLINDING_set_flags() sets the \s-1BN_BLINDING\s0 parameters flags.

\fBBN_BLINDING_create_param() creates new \s-1BN_BLINDING\s0 parameters using the exponent e and the modulus m. bn_mod_exp and \fBm_ctx can be used to pass special functions for exponentiation (normally BN_mod_exp_mont() and \s-1BN_MONT_CTX\s0).

Header "RETURN VALUES" \fBBN_BLINDING_new() returns the newly allocated \s-1BN_BLINDING\s0 structure or \s-1NULL\s0 in case of an error.

\fBBN_BLINDING_update(), BN_BLINDING_convert(), BN_BLINDING_invert(), \fBBN_BLINDING_convert_ex() and BN_BLINDING_invert_ex() return 1 on success and 0 if an error occurred.

\fBBN_BLINDING_is_current_thread() returns 1 if the current thread owns the \s-1BN_BLINDING\s0 object, 0 otherwise.

\fBBN_BLINDING_set_current_thread() doesn't return anything.

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

\fBBN_BLINDING_get_flags() returns the currently set \s-1BN_BLINDING\s0 flags (a unsigned long value).

\fBBN_BLINDING_create_param() returns the newly created \s-1BN_BLINDING\s0 parameters or \s-1NULL\s0 on error.

Header "HISTORY" \fBBN_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(). Header "COPYRIGHT" Copyright 2005-2021 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.