BN_BLINDING_invert (3)

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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.

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);
 #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);

DESCRIPTION

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

BN_BLINDING_free() frees the

structure.

BN_BLINDING_update() updates the

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

a copy the inverse blinding factor Ai will be returned in r (this is useful if a object is shared among several threads). BN_BLINDING_invert_ex() multiplies n with the inverse blinding factor Ai. If r is not 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

BN_BLINDING_thread_id() provides access to the

object within the structure. This is to help users provide proper locking if needed for multi-threaded use. The ``thread id'' object of a newly allocated structure is initialised to the thread id in which BN_BLINDING_new() was called.

BN_BLINDING_get_flags() returns the

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

BN_BLINDING_create_param() creates new

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 ).

RETURN VALUES

BN_BLINDING_new() returns the newly allocated structure or 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

object.

BN_BLINDING_get_flags() returns the currently set

flags (a unsigned long value).

BN_BLINDING_create_param() returns the newly created

parameters or on error.

SEE ALSO

bn(3)

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

AUTHOR

Nils Larsch for the OpenSSL project (www.openssl.org