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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "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. .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #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); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fIBN_BLINDING_new()\fR allocates a new \fB\s-1BN_BLINDING\s0\fR structure and copies the \fBA\fR and \fBAi\fR values into the newly created \fB\s-1BN_BLINDING\s0\fR object. .PP \&\fIBN_BLINDING_free()\fR frees the \fB\s-1BN_BLINDING\s0\fR structure. .PP \&\fIBN_BLINDING_update()\fR updates the \fB\s-1BN_BLINDING\s0\fR parameters by squaring the \fBA\fR and \fBAi\fR or, after specific number of uses and if the necessary parameters are set, by re-creating the blinding parameters. .PP \&\fIBN_BLINDING_convert_ex()\fR multiplies \fBn\fR with the blinding factor \fBA\fR. If \fBr\fR is not \s-1NULL\s0 a copy the inverse blinding factor \fBAi\fR will be returned in \fBr\fR (this is useful if a \fB\s-1RSA\s0\fR object is shared among several threads). \fIBN_BLINDING_invert_ex()\fR multiplies \fBn\fR with the inverse blinding factor \fBAi\fR. If \fBr\fR is not \s-1NULL\s0 it will be used as the inverse blinding. .PP \&\fIBN_BLINDING_convert()\fR and \fIBN_BLINDING_invert()\fR are wrapper functions for \fIBN_BLINDING_convert_ex()\fR and \fIBN_BLINDING_invert_ex()\fR with \fBr\fR set to \s-1NULL.\s0 .PP \&\fIBN_BLINDING_thread_id()\fR provides access to the \fB\s-1CRYPTO_THREADID\s0\fR object within the \fB\s-1BN_BLINDING\s0\fR structure. This is to help users provide proper locking if needed for multi-threaded use. The \*(L"thread id\*(R" object of a newly allocated \fB\s-1BN_BLINDING\s0\fR structure is initialised to the thread id in which \fIBN_BLINDING_new()\fR was called. .PP \&\fIBN_BLINDING_get_flags()\fR returns the \s-1BN_BLINDING\s0 flags. Currently there are two supported flags: \fB\s-1BN_BLINDING_NO_UPDATE\s0\fR and \&\fB\s-1BN_BLINDING_NO_RECREATE\s0\fR. \fB\s-1BN_BLINDING_NO_UPDATE\s0\fR inhibits the automatic update of the \fB\s-1BN_BLINDING\s0\fR parameters after each use and \fB\s-1BN_BLINDING_NO_RECREATE\s0\fR inhibits the automatic re-creation of the \fB\s-1BN_BLINDING\s0\fR parameters after a fixed number of uses (currently 32). In newly allocated \fB\s-1BN_BLINDING\s0\fR objects no flags are set. \&\fIBN_BLINDING_set_flags()\fR sets the \fB\s-1BN_BLINDING\s0\fR parameters flags. .PP \&\fIBN_BLINDING_create_param()\fR creates new \fB\s-1BN_BLINDING\s0\fR parameters using the exponent \fBe\fR and the modulus \fBm\fR. \fBbn_mod_exp\fR and \&\fBm_ctx\fR can be used to pass special functions for exponentiation (normally \fIBN_mod_exp_mont()\fR and \fB\s-1BN_MONT_CTX\s0\fR). .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fIBN_BLINDING_new()\fR returns the newly allocated \fB\s-1BN_BLINDING\s0\fR structure or \s-1NULL\s0 in case of an error. .PP \&\fIBN_BLINDING_update()\fR, \fIBN_BLINDING_convert()\fR, \fIBN_BLINDING_invert()\fR, \&\fIBN_BLINDING_convert_ex()\fR and \fIBN_BLINDING_invert_ex()\fR return 1 on success and 0 if an error occurred. .PP \&\fIBN_BLINDING_thread_id()\fR returns a pointer to the thread id object within a \fB\s-1BN_BLINDING\s0\fR object. .PP \&\fIBN_BLINDING_get_flags()\fR returns the currently set \fB\s-1BN_BLINDING\s0\fR flags (a \fBunsigned long\fR value). .PP \&\fIBN_BLINDING_create_param()\fR returns the newly created \fB\s-1BN_BLINDING\s0\fR parameters or \s-1NULL\s0 on error. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fIbn\fR\|(3) .SH "HISTORY" .IX Header "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. .PP 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 .SH "AUTHOR" .IX Header "AUTHOR" Nils Larsch for the OpenSSL project (http://www.openssl.org).