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

Library

libcrypto.lib

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);

Detailed 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 among 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 occurred.

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()

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).

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