110 lines
4.2 KiB
Text
110 lines
4.2 KiB
Text
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=pod
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=head1 NAME
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BN_BLINDING_new, BN_BLINDING_free, BN_BLINDING_update, BN_BLINDING_convert,
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BN_BLINDING_invert, BN_BLINDING_convert_ex, BN_BLINDING_invert_ex,
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BN_BLINDING_get_thread_id, BN_BLINDING_set_thread_id, BN_BLINDING_get_flags,
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BN_BLINDING_set_flags, BN_BLINDING_create_param - blinding related BIGNUM
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functions.
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=head1 SYNOPSIS
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#include <openssl/bn.h>
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BN_BLINDING *BN_BLINDING_new(const BIGNUM *A, const BIGNUM *Ai,
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BIGNUM *mod);
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void BN_BLINDING_free(BN_BLINDING *b);
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int BN_BLINDING_update(BN_BLINDING *b,BN_CTX *ctx);
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int BN_BLINDING_convert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx);
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int BN_BLINDING_invert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx);
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int BN_BLINDING_convert_ex(BIGNUM *n, BIGNUM *r, BN_BLINDING *b,
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BN_CTX *ctx);
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int BN_BLINDING_invert_ex(BIGNUM *n, const BIGNUM *r, BN_BLINDING *b,
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BN_CTX *ctx);
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unsigned long BN_BLINDING_get_thread_id(const BN_BLINDING *);
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void BN_BLINDING_set_thread_id(BN_BLINDING *, unsigned long);
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unsigned long BN_BLINDING_get_flags(const BN_BLINDING *);
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void BN_BLINDING_set_flags(BN_BLINDING *, unsigned long);
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BN_BLINDING *BN_BLINDING_create_param(BN_BLINDING *b,
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const BIGNUM *e, BIGNUM *m, BN_CTX *ctx,
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int (*bn_mod_exp)(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
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const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx),
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BN_MONT_CTX *m_ctx);
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=head1 DESCRIPTION
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BN_BLINDING_new() allocates a new B<BN_BLINDING> structure and copies
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the B<A> and B<Ai> values into the newly created B<BN_BLINDING> object.
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BN_BLINDING_free() frees the B<BN_BLINDING> structure.
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BN_BLINDING_update() updates the B<BN_BLINDING> parameters by squaring
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the B<A> and B<Ai> or, after specific number of uses and if the
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necessary parameters are set, by re-creating the blinding parameters.
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BN_BLINDING_convert_ex() multiplies B<n> with the blinding factor B<A>.
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If B<r> is not NULL a copy the inverse blinding factor B<Ai> will be
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returned in B<r> (this is useful if a B<RSA> object is shared amoung
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several threads). BN_BLINDING_invert_ex() multiplies B<n> with the
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inverse blinding factor B<Ai>. If B<r> is not NULL it will be used as
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the inverse blinding.
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BN_BLINDING_convert() and BN_BLINDING_invert() are wrapper
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functions for BN_BLINDING_convert_ex() and BN_BLINDING_invert_ex()
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with B<r> set to NULL.
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BN_BLINDING_set_thread_id() and BN_BLINDING_get_thread_id()
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set and get the "thread id" value of the B<BN_BLINDING> structure,
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a field provided to users of B<BN_BLINDING> structure to help them
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provide proper locking if needed for multi-threaded use. The
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"thread id" of a newly allocated B<BN_BLINDING> structure is zero.
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BN_BLINDING_get_flags() returns the BN_BLINDING flags. Currently
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there are two supported flags: B<BN_BLINDING_NO_UPDATE> and
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B<BN_BLINDING_NO_RECREATE>. B<BN_BLINDING_NO_UPDATE> inhibits the
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automatic update of the B<BN_BLINDING> parameters after each use
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and B<BN_BLINDING_NO_RECREATE> inhibits the automatic re-creation
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of the B<BN_BLINDING> parameters after a fixed number of uses (currently
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32). In newly allocated B<BN_BLINDING> objects no flags are set.
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BN_BLINDING_set_flags() sets the B<BN_BLINDING> parameters flags.
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BN_BLINDING_create_param() creates new B<BN_BLINDING> parameters
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using the exponent B<e> and the modulus B<m>. B<bn_mod_exp> and
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B<m_ctx> can be used to pass special functions for exponentiation
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(normally BN_mod_exp_mont() and B<BN_MONT_CTX>).
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=head1 RETURN VALUES
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BN_BLINDING_new() returns the newly allocated B<BN_BLINDING> structure
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or NULL in case of an error.
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BN_BLINDING_update(), BN_BLINDING_convert(), BN_BLINDING_invert(),
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BN_BLINDING_convert_ex() and BN_BLINDING_invert_ex() return 1 on
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success and 0 if an error occured.
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BN_BLINDING_get_thread_id() returns the thread id (a B<unsigned long>
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value) or 0 if not set.
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BN_BLINDING_get_flags() returns the currently set B<BN_BLINDING> flags
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(a B<unsigned long> value).
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BN_BLINDING_create_param() returns the newly created B<BN_BLINDING>
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parameters or NULL on error.
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=head1 SEE ALSO
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L<bn(3)|bn(3)>
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=head1 HISTORY
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BN_BLINDING_convert_ex, BN_BLINDIND_invert_ex, BN_BLINDING_get_thread_id,
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BN_BLINDING_set_thread_id, BN_BLINDING_set_flags, BN_BLINDING_get_flags
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and BN_BLINDING_create_param were first introduced in OpenSSL 0.9.8
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=head1 AUTHOR
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Nils Larsch for the OpenSSL project (http://www.openssl.org).
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=cut
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