forked from cory/tildefriends
Cory McWilliams
09ddfffa6b
git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@4088 ed5197a5-7fde-0310-b194-c3ffbd925b24
255 lines
9.8 KiB
Groff
255 lines
9.8 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 "2020-04-21" "1.1.1g" "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, BN_BLINDING_invert, BN_BLINDING_convert_ex, BN_BLINDING_invert_ex, BN_BLINDING_is_current_thread, BN_BLINDING_set_current_thread, BN_BLINDING_lock, BN_BLINDING_unlock, BN_BLINDING_get_flags, BN_BLINDING_set_flags, BN_BLINDING_create_param \- blinding related BIGNUM 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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\& int BN_BLINDING_is_current_thread(BN_BLINDING *b);
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\& void BN_BLINDING_set_current_thread(BN_BLINDING *b);
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\& int BN_BLINDING_lock(BN_BLINDING *b);
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\& int BN_BLINDING_unlock(BN_BLINDING *b);
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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,
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\& const BIGNUM *a,
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\& const BIGNUM *p,
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\& const BIGNUM *m,
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\& BN_CTX *ctx,
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\& 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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\&\fBBN_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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\&\fBBN_BLINDING_free()\fR frees the \fB\s-1BN_BLINDING\s0\fR structure.
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If \fBb\fR is \s-1NULL,\s0 nothing is done.
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.PP
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\&\fBBN_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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\&\fBBN_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 among
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several threads). \fBBN_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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\&\fBBN_BLINDING_convert()\fR and \fBBN_BLINDING_invert()\fR are wrapper
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functions for \fBBN_BLINDING_convert_ex()\fR and \fBBN_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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\&\fBBN_BLINDING_is_current_thread()\fR returns whether the \fB\s-1BN_BLINDING\s0\fR
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structure is owned by the current thread. This is to help users
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provide proper locking if needed for multi-threaded use.
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.PP
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\&\fBBN_BLINDING_set_current_thread()\fR sets the current thread as the
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owner of the \fB\s-1BN_BLINDING\s0\fR structure.
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.PP
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\&\fBBN_BLINDING_lock()\fR locks the \fB\s-1BN_BLINDING\s0\fR structure.
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.PP
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\&\fBBN_BLINDING_unlock()\fR unlocks the \fB\s-1BN_BLINDING\s0\fR structure.
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.PP
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\&\fBBN_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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\&\fBBN_BLINDING_set_flags()\fR sets the \fB\s-1BN_BLINDING\s0\fR parameters flags.
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.PP
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\&\fBBN_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 \fBBN_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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\&\fBBN_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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\&\fBBN_BLINDING_update()\fR, \fBBN_BLINDING_convert()\fR, \fBBN_BLINDING_invert()\fR,
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\&\fBBN_BLINDING_convert_ex()\fR and \fBBN_BLINDING_invert_ex()\fR return 1 on
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success and 0 if an error occurred.
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.PP
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\&\fBBN_BLINDING_is_current_thread()\fR returns 1 if the current thread owns
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the \fB\s-1BN_BLINDING\s0\fR object, 0 otherwise.
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.PP
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\&\fBBN_BLINDING_set_current_thread()\fR doesn't return anything.
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.PP
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\&\fBBN_BLINDING_lock()\fR, \fBBN_BLINDING_unlock()\fR return 1 if the operation
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succeeded or 0 on error.
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.PP
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\&\fBBN_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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\&\fBBN_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 "HISTORY"
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.IX Header "HISTORY"
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\&\fBBN_BLINDING_thread_id()\fR was first introduced in OpenSSL 1.0.0, and it
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deprecates \fBBN_BLINDING_set_thread_id()\fR and \fBBN_BLINDING_get_thread_id()\fR.
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2005\-2017 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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