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BN_BLINDING_new(3)                                 OpenSSL                                BN_BLINDING_new(3)



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_get_flags, BN_BLINDING_set_flags, BN_BLINDING_create_param - blinding related BIGNUM
       functions.

SYNOPSIS
        #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);
        unsigned long BN_BLINDING_get_thread_id(const BN_BLINDING *);
        void BN_BLINDING_set_thread_id(BN_BLINDING *, unsigned long);
        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);

DESCRIPTION
       BN_BLINDING_new() allocates a new BN_BLINDING structure and copies the A and Ai values into the newly
       created BN_BLINDING object.

       BN_BLINDING_free() frees the BN_BLINDING structure.

       BN_BLINDING_update() updates the BN_BLINDING parameters by squaring the A and 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 n with the blinding factor A.  If r is not NULL a copy the
       inverse blinding factor Ai will be returned in r (this is useful if a RSA object is shared amoung
       several threads). BN_BLINDING_invert_ex() multiplies n with the inverse blinding factor Ai. If 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 r set to NULL.

       BN_BLINDING_set_thread_id() and BN_BLINDING_get_thread_id() set and get the "thread id" value of the
       BN_BLINDING structure, a field provided to users of BN_BLINDING structure to help them provide proper
       locking if needed for multi-threaded use. The "thread id" of a newly allocated BN_BLINDING structure
       is zero.

       BN_BLINDING_get_flags() returns the BN_BLINDING flags. Currently there are two supported flags:
       BN_BLINDING_NO_UPDATE and BN_BLINDING_NO_RECREATE. BN_BLINDING_NO_UPDATE inhibits the automatic
       update of the BN_BLINDING parameters after each use and BN_BLINDING_NO_RECREATE inhibits the
       automatic re-creation of the BN_BLINDING parameters after a fixed number of uses (currently 32). In
       newly allocated BN_BLINDING objects no flags are set.  BN_BLINDING_set_flags() sets the BN_BLINDING
       parameters flags.

       BN_BLINDING_create_param() creates new BN_BLINDING parameters using the exponent e and the modulus m.
       bn_mod_exp and m_ctx can be used to pass special functions for exponentiation (normally
       BN_mod_exp_mont() and BN_MONT_CTX).

RETURN VALUES
       BN_BLINDING_new() returns the newly allocated 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 occured.

       BN_BLINDING_get_thread_id() returns the thread id (a unsigned long value) or 0 if not set.

       BN_BLINDING_get_flags() returns the currently set BN_BLINDING flags (a unsigned long value).

       BN_BLINDING_create_param() returns the newly created BN_BLINDING parameters or NULL on error.

SEE ALSO
       bn(3)

HISTORY
       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

AUTHOR
       Nils Larsch for the OpenSSL project (http://www.openssl.org).



50                                               2013-03-05                               BN_BLINDING_new(3)