BN_BLINDING_new(3ssl)
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
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).