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-=head1 NAME
-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
-=head1 SYNOPSIS
- #include <openssl/bn.h>
- 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);
- unsigned long BN_BLINDING_get_thread_id(const BN_BLINDING *);
- void BN_BLINDING_set_thread_id(BN_BLINDING *, unsigned long);
- #endif
- unsigned long BN_BLINDING_get_flags(const BN_BLINDING *);
- void BN_BLINDING_set_flags(BN_BLINDING *, unsigned long);
- 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);
-BN_BLINDING_new() allocates a new B<BN_BLINDING> structure and copies
-the B<A> and B<Ai> values into the newly created B<BN_BLINDING> object.
-BN_BLINDING_free() frees the B<BN_BLINDING> structure.
-BN_BLINDING_update() updates the B<BN_BLINDING> parameters by squaring
-the B<A> and B<Ai> 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<n> with the blinding factor B<A>.
-If B<r> is not NULL a copy the inverse blinding factor B<Ai> will be
-returned in B<r> (this is useful if a B<RSA> object is shared among
-several threads). BN_BLINDING_invert_ex() multiplies B<n> with the
-inverse blinding factor B<Ai>. If B<r> 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<r> set to NULL.
-BN_BLINDING_thread_id() provides access to the B<CRYPTO_THREADID>
-object within the B<BN_BLINDING> structure. This is to help users
-provide proper locking if needed for multi-threaded use. The "thread
-id" object of a newly allocated B<BN_BLINDING> 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<BN_BLINDING_NO_UPDATE> and
-automatic update of the B<BN_BLINDING> parameters after each use
-and B<BN_BLINDING_NO_RECREATE> inhibits the automatic re-creation
-of the B<BN_BLINDING> parameters after a fixed number of uses (currently
-32). In newly allocated B<BN_BLINDING> objects no flags are set.
-BN_BLINDING_set_flags() sets the B<BN_BLINDING> parameters flags.
-BN_BLINDING_create_param() creates new B<BN_BLINDING> parameters
-using the exponent B<e> and the modulus B<m>. B<bn_mod_exp> and
-B<m_ctx> can be used to pass special functions for exponentiation
-(normally BN_mod_exp_mont() and B<BN_MONT_CTX>).
-BN_BLINDING_new() returns the newly allocated B<BN_BLINDING> 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<BN_BLINDING> object.
-BN_BLINDING_get_flags() returns the currently set B<BN_BLINDING> flags
-(a B<unsigned long> value).
-BN_BLINDING_create_param() returns the newly created B<BN_BLINDING>
-parameters or NULL on error.
-=head1 SEE ALSO
-=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.
-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
-=head1 AUTHOR
-Nils Larsch for the OpenSSL project (http://www.openssl.org).