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);
#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);
DESCRIPTIONBN_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_thread_id() provides access to the CRYPTO_THREADID object
within the 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 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: 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 VALUESBN_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_thread_id() returns a pointer to the thread id object
within a BN_BLINDING object.
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 ALSObn(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 (http://www.openssl.org).
OpenBSD 4.9 October 2, 2010
