232 lines
8.6 KiB
Groff
232 lines
8.6 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "BN_BLINDING_new 3"
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.TH BN_BLINDING_new 3 "2012-05-10" "0.9.8x" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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BN_BLINDING_new, BN_BLINDING_free, BN_BLINDING_update, BN_BLINDING_convert,
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BN_BLINDING_invert, BN_BLINDING_convert_ex, BN_BLINDING_invert_ex,
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BN_BLINDING_get_thread_id, BN_BLINDING_set_thread_id, BN_BLINDING_get_flags,
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BN_BLINDING_set_flags, BN_BLINDING_create_param \- blinding related BIGNUM
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functions.
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/bn.h>
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\&
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\& BN_BLINDING *BN_BLINDING_new(const BIGNUM *A, const BIGNUM *Ai,
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\& BIGNUM *mod);
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\& void BN_BLINDING_free(BN_BLINDING *b);
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\& int BN_BLINDING_update(BN_BLINDING *b,BN_CTX *ctx);
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\& int BN_BLINDING_convert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx);
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\& int BN_BLINDING_invert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx);
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\& int BN_BLINDING_convert_ex(BIGNUM *n, BIGNUM *r, BN_BLINDING *b,
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\& BN_CTX *ctx);
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\& int BN_BLINDING_invert_ex(BIGNUM *n, const BIGNUM *r, BN_BLINDING *b,
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\& BN_CTX *ctx);
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\& unsigned long BN_BLINDING_get_thread_id(const BN_BLINDING *);
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\& void BN_BLINDING_set_thread_id(BN_BLINDING *, unsigned long);
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\& unsigned long BN_BLINDING_get_flags(const BN_BLINDING *);
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\& void BN_BLINDING_set_flags(BN_BLINDING *, unsigned long);
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\& BN_BLINDING *BN_BLINDING_create_param(BN_BLINDING *b,
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\& const BIGNUM *e, BIGNUM *m, BN_CTX *ctx,
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\& int (*bn_mod_exp)(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
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\& const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx),
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\& BN_MONT_CTX *m_ctx);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fIBN_BLINDING_new()\fR allocates a new \fB\s-1BN_BLINDING\s0\fR structure and copies
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the \fBA\fR and \fBAi\fR values into the newly created \fB\s-1BN_BLINDING\s0\fR object.
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.PP
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\&\fIBN_BLINDING_free()\fR frees the \fB\s-1BN_BLINDING\s0\fR structure.
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.PP
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\&\fIBN_BLINDING_update()\fR updates the \fB\s-1BN_BLINDING\s0\fR parameters by squaring
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the \fBA\fR and \fBAi\fR or, after specific number of uses and if the
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necessary parameters are set, by re-creating the blinding parameters.
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.PP
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\&\fIBN_BLINDING_convert_ex()\fR multiplies \fBn\fR with the blinding factor \fBA\fR.
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If \fBr\fR is not \s-1NULL\s0 a copy the inverse blinding factor \fBAi\fR will be
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returned in \fBr\fR (this is useful if a \fB\s-1RSA\s0\fR object is shared amoung
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several threads). \fIBN_BLINDING_invert_ex()\fR multiplies \fBn\fR with the
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inverse blinding factor \fBAi\fR. If \fBr\fR is not \s-1NULL\s0 it will be used as
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the inverse blinding.
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.PP
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\&\fIBN_BLINDING_convert()\fR and \fIBN_BLINDING_invert()\fR are wrapper
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functions for \fIBN_BLINDING_convert_ex()\fR and \fIBN_BLINDING_invert_ex()\fR
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with \fBr\fR set to \s-1NULL\s0.
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.PP
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\&\fIBN_BLINDING_set_thread_id()\fR and \fIBN_BLINDING_get_thread_id()\fR
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set and get the \*(L"thread id\*(R" value of the \fB\s-1BN_BLINDING\s0\fR structure,
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a field provided to users of \fB\s-1BN_BLINDING\s0\fR structure to help them
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provide proper locking if needed for multi-threaded use. The
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\&\*(L"thread id\*(R" of a newly allocated \fB\s-1BN_BLINDING\s0\fR structure is zero.
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.PP
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\&\fIBN_BLINDING_get_flags()\fR returns the \s-1BN_BLINDING\s0 flags. Currently
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there are two supported flags: \fB\s-1BN_BLINDING_NO_UPDATE\s0\fR and
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\&\fB\s-1BN_BLINDING_NO_RECREATE\s0\fR. \fB\s-1BN_BLINDING_NO_UPDATE\s0\fR inhibits the
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automatic update of the \fB\s-1BN_BLINDING\s0\fR parameters after each use
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and \fB\s-1BN_BLINDING_NO_RECREATE\s0\fR inhibits the automatic re-creation
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of the \fB\s-1BN_BLINDING\s0\fR parameters after a fixed number of uses (currently
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32). In newly allocated \fB\s-1BN_BLINDING\s0\fR objects no flags are set.
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\&\fIBN_BLINDING_set_flags()\fR sets the \fB\s-1BN_BLINDING\s0\fR parameters flags.
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.PP
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\&\fIBN_BLINDING_create_param()\fR creates new \fB\s-1BN_BLINDING\s0\fR parameters
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using the exponent \fBe\fR and the modulus \fBm\fR. \fBbn_mod_exp\fR and
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\&\fBm_ctx\fR can be used to pass special functions for exponentiation
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(normally \fIBN_mod_exp_mont()\fR and \fB\s-1BN_MONT_CTX\s0\fR).
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIBN_BLINDING_new()\fR returns the newly allocated \fB\s-1BN_BLINDING\s0\fR structure
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or \s-1NULL\s0 in case of an error.
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.PP
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\&\fIBN_BLINDING_update()\fR, \fIBN_BLINDING_convert()\fR, \fIBN_BLINDING_invert()\fR,
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\&\fIBN_BLINDING_convert_ex()\fR and \fIBN_BLINDING_invert_ex()\fR return 1 on
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success and 0 if an error occured.
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.PP
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\&\fIBN_BLINDING_get_thread_id()\fR returns the thread id (a \fBunsigned long\fR
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value) or 0 if not set.
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.PP
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\&\fIBN_BLINDING_get_flags()\fR returns the currently set \fB\s-1BN_BLINDING\s0\fR flags
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(a \fBunsigned long\fR value).
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.PP
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\&\fIBN_BLINDING_create_param()\fR returns the newly created \fB\s-1BN_BLINDING\s0\fR
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parameters or \s-1NULL\s0 on error.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIbn\fR\|(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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BN_BLINDING_convert_ex, BN_BLINDIND_invert_ex, BN_BLINDING_get_thread_id,
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BN_BLINDING_set_thread_id, BN_BLINDING_set_flags, BN_BLINDING_get_flags
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and BN_BLINDING_create_param were first introduced in OpenSSL 0.9.8
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.SH "AUTHOR"
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.IX Header "AUTHOR"
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Nils Larsch for the OpenSSL project (http://www.openssl.org).
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