.\" -*- mode: troff; coding: utf-8 -*-
.\" Automatically generated by Pod::Man 5.01 (Pod::Simple 3.43)
.\"
.\" Standard preamble:
.\" ========================================================================
.de Sp \" Vertical space (when we can't use .PP)
.if t .sp .5v
.if n .sp
..
.de Vb \" Begin verbatim text
.ft CW
.nf
.ne \\$1
..
.de Ve \" End verbatim text
.ft R
.fi
..
.\" \*(C` and \*(C' are quotes in nroff, nothing in troff, for use with C<>.
.ie n \{\
.    ds C` ""
.    ds C' ""
'br\}
.el\{\
.    ds C`
.    ds C'
'br\}
.\"
.\" Escape single quotes in literal strings from groff's Unicode transform.
.ie \n(.g .ds Aq \(aq
.el       .ds Aq '
.\"
.\" If the F register is >0, we'll generate index entries on stderr for
.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
.\" entries marked with X<> in POD.  Of course, you'll have to process the
.\" output yourself in some meaningful fashion.
.\"
.\" Avoid warning from groff about undefined register 'F'.
.de IX
..
.nr rF 0
.if \n(.g .if rF .nr rF 1
.if (\n(rF:(\n(.g==0)) \{\
.    if \nF \{\
.        de IX
.        tm Index:\\$1\t\\n%\t"\\$2"
..
.        if !\nF==2 \{\
.            nr % 0
.            nr F 2
.        \}
.    \}
.\}
.rr rF
.\" ========================================================================
.\"
.IX Title "BN_BLINDING_new 3"
.TH BN_BLINDING_new 3 2019-12-20 1.0.2u 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_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.
.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);
\& #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);
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
\&\fBBN_BLINDING_new()\fR allocates a new \fBBN_BLINDING\fR structure and copies
the \fBA\fR and \fBAi\fR values into the newly created \fBBN_BLINDING\fR object.
.PP
\&\fBBN_BLINDING_free()\fR frees the \fBBN_BLINDING\fR structure.
.PP
\&\fBBN_BLINDING_update()\fR updates the \fBBN_BLINDING\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 NULL a copy the inverse blinding factor \fBAi\fR will be
returned in \fBr\fR (this is useful if a \fBRSA\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 NULL 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 NULL.
.PP
\&\fBBN_BLINDING_thread_id()\fR provides access to the \fBCRYPTO_THREADID\fR
object within the \fBBN_BLINDING\fR structure. This is to help users
provide proper locking if needed for multi-threaded use. The "thread
id" object of a newly allocated \fBBN_BLINDING\fR structure is
initialised to the thread id in which \fBBN_BLINDING_new()\fR was called.
.PP
\&\fBBN_BLINDING_get_flags()\fR returns the BN_BLINDING flags. Currently
there are two supported flags: \fBBN_BLINDING_NO_UPDATE\fR and
\&\fBBN_BLINDING_NO_RECREATE\fR. \fBBN_BLINDING_NO_UPDATE\fR inhibits the
automatic update of the \fBBN_BLINDING\fR parameters after each use
and \fBBN_BLINDING_NO_RECREATE\fR inhibits the automatic re-creation
of the \fBBN_BLINDING\fR parameters after a fixed number of uses (currently
32). In newly allocated \fBBN_BLINDING\fR objects no flags are set.
\&\fBBN_BLINDING_set_flags()\fR sets the \fBBN_BLINDING\fR parameters flags.
.PP
\&\fBBN_BLINDING_create_param()\fR creates new \fBBN_BLINDING\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 \fBBN_MONT_CTX\fR).
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBBN_BLINDING_new()\fR returns the newly allocated \fBBN_BLINDING\fR structure
or NULL 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_thread_id()\fR returns a pointer to the thread id object
within a \fBBN_BLINDING\fR object.
.PP
\&\fBBN_BLINDING_get_flags()\fR returns the currently set \fBBN_BLINDING\fR flags
(a \fBunsigned long\fR value).
.PP
\&\fBBN_BLINDING_create_param()\fR returns the newly created \fBBN_BLINDING\fR 
parameters or NULL on error.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBbn\fR\|(3)
.SH HISTORY
.IX Header "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.
.PP
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
.SH AUTHOR
.IX Header "AUTHOR"
Nils Larsch for the OpenSSL project (http://www.openssl.org).