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<p><a name="__index__"></a></p>
<ul>
<li><a href="#name">NAME</a></li>
<li><a href="#synopsis">SYNOPSIS</a></li>
<li><a href="#description">DESCRIPTION</a></li>
<li><a href="#return_values">RETURN VALUES</a></li>
<li><a href="#history">HISTORY</a></li>
<li><a href="#copyright">COPYRIGHT</a></li>
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<p>
</p>
<hr />
<h1><a name="name">NAME</a></h1>
<p>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</p>
<p>
</p>
<hr />
<h1><a name="synopsis">SYNOPSIS</a></h1>
<pre>
#include <openssl/bn.h></pre>
<pre>
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);</pre>
<p>
</p>
<hr />
<h1><a name="description">DESCRIPTION</a></h1>
<p><code>BN_BLINDING_new()</code> allocates a new <strong>BN_BLINDING</strong> structure and copies
the <strong>A</strong> and <strong>Ai</strong> values into the newly created <strong>BN_BLINDING</strong> object.</p>
<p><code>BN_BLINDING_free()</code> frees the <strong>BN_BLINDING</strong> structure.
If <strong>b</strong> is NULL, nothing is done.</p>
<p><code>BN_BLINDING_update()</code> updates the <strong>BN_BLINDING</strong> parameters by squaring
the <strong>A</strong> and <strong>Ai</strong> or, after specific number of uses and if the
necessary parameters are set, by re-creating the blinding parameters.</p>
<p><code>BN_BLINDING_convert_ex()</code> multiplies <strong>n</strong> with the blinding factor <strong>A</strong>.
If <strong>r</strong> is not NULL a copy the inverse blinding factor <strong>Ai</strong> will be
returned in <strong>r</strong> (this is useful if a <strong>RSA</strong> object is shared among
several threads). <code>BN_BLINDING_invert_ex()</code> multiplies <strong>n</strong> with the
inverse blinding factor <strong>Ai</strong>. If <strong>r</strong> is not NULL it will be used as
the inverse blinding.</p>
<p><code>BN_BLINDING_convert()</code> and <code>BN_BLINDING_invert()</code> are wrapper
functions for <code>BN_BLINDING_convert_ex()</code> and <code>BN_BLINDING_invert_ex()</code>
with <strong>r</strong> set to NULL.</p>
<p><code>BN_BLINDING_is_current_thread()</code> returns whether the <strong>BN_BLINDING</strong>
structure is owned by the current thread. This is to help users
provide proper locking if needed for multi-threaded use.</p>
<p><code>BN_BLINDING_set_current_thread()</code> sets the current thread as the
owner of the <strong>BN_BLINDING</strong> structure.</p>
<p><code>BN_BLINDING_lock()</code> locks the <strong>BN_BLINDING</strong> structure.</p>
<p><code>BN_BLINDING_unlock()</code> unlocks the <strong>BN_BLINDING</strong> structure.</p>
<p><code>BN_BLINDING_get_flags()</code> returns the BN_BLINDING flags. Currently
there are two supported flags: <strong>BN_BLINDING_NO_UPDATE</strong> and
<strong>BN_BLINDING_NO_RECREATE</strong>. <strong>BN_BLINDING_NO_UPDATE</strong> inhibits the
automatic update of the <strong>BN_BLINDING</strong> parameters after each use
and <strong>BN_BLINDING_NO_RECREATE</strong> inhibits the automatic re-creation
of the <strong>BN_BLINDING</strong> parameters after a fixed number of uses (currently
32). In newly allocated <strong>BN_BLINDING</strong> objects no flags are set.
<code>BN_BLINDING_set_flags()</code> sets the <strong>BN_BLINDING</strong> parameters flags.</p>
<p><code>BN_BLINDING_create_param()</code> creates new <strong>BN_BLINDING</strong> parameters
using the exponent <strong>e</strong> and the modulus <strong>m</strong>. <strong>bn_mod_exp</strong> and
<strong>m_ctx</strong> can be used to pass special functions for exponentiation
(normally <code>BN_mod_exp_mont()</code> and <strong>BN_MONT_CTX</strong>).</p>
<p>
</p>
<hr />
<h1><a name="return_values">RETURN VALUES</a></h1>
<p><code>BN_BLINDING_new()</code> returns the newly allocated <strong>BN_BLINDING</strong> structure
or NULL in case of an error.</p>
<p><code>BN_BLINDING_update()</code>, <code>BN_BLINDING_convert()</code>, <code>BN_BLINDING_invert()</code>,
<code>BN_BLINDING_convert_ex()</code> and <code>BN_BLINDING_invert_ex()</code> return 1 on
success and 0 if an error occurred.</p>
<p><code>BN_BLINDING_is_current_thread()</code> returns 1 if the current thread owns
the <strong>BN_BLINDING</strong> object, 0 otherwise.</p>
<p><code>BN_BLINDING_set_current_thread()</code> doesn't return anything.</p>
<p><code>BN_BLINDING_lock()</code>, <code>BN_BLINDING_unlock()</code> return 1 if the operation
succeeded or 0 on error.</p>
<p><code>BN_BLINDING_get_flags()</code> returns the currently set <strong>BN_BLINDING</strong> flags
(a <strong>unsigned long</strong> value).</p>
<p><code>BN_BLINDING_create_param()</code> returns the newly created <strong>BN_BLINDING</strong>
parameters or NULL on error.</p>
<p>
</p>
<hr />
<h1><a name="history">HISTORY</a></h1>
<p><code>BN_BLINDING_thread_id()</code> was first introduced in OpenSSL 1.0.0, and it
deprecates <code>BN_BLINDING_set_thread_id()</code> and <code>BN_BLINDING_get_thread_id()</code>.</p>
<p>
</p>
<hr />
<h1><a name="copyright">COPYRIGHT</a></h1>
<p>Copyright 2005-2017 The OpenSSL Project Authors. All Rights Reserved.</p>
<p>Licensed under the OpenSSL license (the "License"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file LICENSE in the source distribution or at
<a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p>
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