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✏️ Editing: BN_BLINDING_invert.3

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.\" ========================================================================
.\"
.IX Title "BN_BLINDING_NEW 3"
.TH BN_BLINDING_NEW 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "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
.SH "SYNOPSIS"
.IX 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 *);
\& 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);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBBN_BLINDING_new()\fR allocates a new \fB\s-1BN_BLINDING\s0\fR structure and copies
the \fBA\fR and \fBAi\fR values into the newly created \fB\s-1BN_BLINDING\s0\fR object.
.PP
\&\fBBN_BLINDING_free()\fR frees the \fB\s-1BN_BLINDING\s0\fR structure.
If \fBb\fR is \s-1NULL,\s0 nothing is done.
.PP
\&\fBBN_BLINDING_update()\fR updates the \fB\s-1BN_BLINDING\s0\fR parameters by squaring
the \fBA\fR and \fBAi\fR or, after specific number of uses and if the
necessary parameters are set, by re-creating the blinding parameters.
.PP
\&\fBBN_BLINDING_convert_ex()\fR multiplies \fBn\fR with the blinding factor \fBA\fR.
If \fBr\fR is not \s-1NULL\s0 a copy the inverse blinding factor \fBAi\fR will be
returned in \fBr\fR (this is useful if a \fB\s-1RSA\s0\fR object is shared among
several threads). \fBBN_BLINDING_invert_ex()\fR multiplies \fBn\fR with the
inverse blinding factor \fBAi\fR. If \fBr\fR is not \s-1NULL\s0 it will be used as
the inverse blinding.
.PP
\&\fBBN_BLINDING_convert()\fR and \fBBN_BLINDING_invert()\fR are wrapper
functions for \fBBN_BLINDING_convert_ex()\fR and \fBBN_BLINDING_invert_ex()\fR
with \fBr\fR set to \s-1NULL.\s0
.PP
\&\fBBN_BLINDING_is_current_thread()\fR returns whether the \fB\s-1BN_BLINDING\s0\fR
structure is owned by the current thread. This is to help users
provide proper locking if needed for multi-threaded use.
.PP
\&\fBBN_BLINDING_set_current_thread()\fR sets the current thread as the
owner of the \fB\s-1BN_BLINDING\s0\fR structure.
.PP
\&\fBBN_BLINDING_lock()\fR locks the \fB\s-1BN_BLINDING\s0\fR structure.
.PP
\&\fBBN_BLINDING_unlock()\fR unlocks the \fB\s-1BN_BLINDING\s0\fR structure.
.PP
\&\fBBN_BLINDING_get_flags()\fR returns the \s-1BN_BLINDING\s0 flags. Currently
there are two supported flags: \fB\s-1BN_BLINDING_NO_UPDATE\s0\fR and
\&\fB\s-1BN_BLINDING_NO_RECREATE\s0\fR. \fB\s-1BN_BLINDING_NO_UPDATE\s0\fR inhibits the
automatic update of the \fB\s-1BN_BLINDING\s0\fR parameters after each use
and \fB\s-1BN_BLINDING_NO_RECREATE\s0\fR inhibits the automatic re-creation
of the \fB\s-1BN_BLINDING\s0\fR parameters after a fixed number of uses (currently
32). In newly allocated \fB\s-1BN_BLINDING\s0\fR objects no flags are set.
\&\fBBN_BLINDING_set_flags()\fR sets the \fB\s-1BN_BLINDING\s0\fR parameters flags.
.PP
\&\fBBN_BLINDING_create_param()\fR creates new \fB\s-1BN_BLINDING\s0\fR parameters
using the exponent \fBe\fR and the modulus \fBm\fR. \fBbn_mod_exp\fR and
\&\fBm_ctx\fR can be used to pass special functions for exponentiation
(normally \fBBN_mod_exp_mont()\fR and \fB\s-1BN_MONT_CTX\s0\fR).
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBBN_BLINDING_new()\fR returns the newly allocated \fB\s-1BN_BLINDING\s0\fR structure
or \s-1NULL\s0 in case of an error.
.PP
\&\fBBN_BLINDING_update()\fR, \fBBN_BLINDING_convert()\fR, \fBBN_BLINDING_invert()\fR,
\&\fBBN_BLINDING_convert_ex()\fR and \fBBN_BLINDING_invert_ex()\fR return 1 on
success and 0 if an error occurred.
.PP
\&\fBBN_BLINDING_is_current_thread()\fR returns 1 if the current thread owns
the \fB\s-1BN_BLINDING\s0\fR object, 0 otherwise.
.PP
\&\fBBN_BLINDING_set_current_thread()\fR doesn't return anything.
.PP
\&\fBBN_BLINDING_lock()\fR, \fBBN_BLINDING_unlock()\fR return 1 if the operation
succeeded or 0 on error.
.PP
\&\fBBN_BLINDING_get_flags()\fR returns the currently set \fB\s-1BN_BLINDING\s0\fR flags
(a \fBunsigned long\fR value).
.PP
\&\fBBN_BLINDING_create_param()\fR returns the newly created \fB\s-1BN_BLINDING\s0\fR
parameters or \s-1NULL\s0 on error.
.SH "HISTORY"
.IX Header "HISTORY"
\&\fBBN_BLINDING_thread_id()\fR was first introduced in OpenSSL 1.0.0, and it
deprecates \fBBN_BLINDING_set_thread_id()\fR and \fBBN_BLINDING_get_thread_id()\fR.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2005\-2017 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (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>.

MR SKB