NetBSD-5.0.2/lib/libcrypto/man/BN_BLINDING_new.3
.\" $NetBSD: BN_BLINDING_new.3,v 1.5 2008/05/09 22:02:42 christos Exp $
.\"
.\" Automatically generated by Pod::Man v1.37, Pod::Parser v1.32
.\"
.\" Standard preamble:
.\" ========================================================================
.de Sh \" Subsection heading
.br
.if t .Sp
.ne 5
.PP
\fB\\$1\fR
.PP
..
.de Sp \" Vertical space (when we can't use .PP)
.if t .sp .5v
.if n .sp
..
.de Vb \" Begin verbatim text
.ft CW
.nf
.ne \\$1
..
.de Ve \" End verbatim text
.ft R
.fi
..
.\" Set up some character translations and predefined strings. \*(-- will
.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left
.\" double quote, and \*(R" will give a right double quote. | will give a
.\" real vertical bar. \*(C+ will give a nicer C++. Capital omega is used to
.\" do unbreakable dashes and therefore won't be available. \*(C` and \*(C'
.\" expand to `' in nroff, nothing in troff, for use with C<>.
.tr \(*W-|\(bv\*(Tr
.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
.ie n \{\
. ds -- \(*W-
. ds PI pi
. if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
. if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch
. ds L" ""
. ds R" ""
. ds C` ""
. ds C' ""
'br\}
.el\{\
. ds -- \|\(em\|
. ds PI \(*p
. ds L" ``
. ds R" ''
'br\}
.\"
.\" If the F register is turned on, we'll generate index entries on stderr for
.\" titles (.TH), headers (.SH), subsections (.Sh), items (.Ip), and index
.\" entries marked with X<> in POD. Of course, you'll have to process the
.\" output yourself in some meaningful fashion.
.if \nF \{\
. de IX
. tm Index:\\$1\t\\n%\t"\\$2"
..
. nr % 0
. rr F
.\}
.\"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.hy 0
.if n .na
.\"
.\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
.\" Fear. Run. Save yourself. No user-serviceable parts.
. \" fudge factors for nroff and troff
.if n \{\
. ds #H 0
. ds #V .8m
. ds #F .3m
. ds #[ \f1
. ds #] \fP
.\}
.if t \{\
. ds #H ((1u-(\\\\n(.fu%2u))*.13m)
. ds #V .6m
. ds #F 0
. ds #[ \&
. ds #] \&
.\}
. \" simple accents for nroff and troff
.if n \{\
. ds ' \&
. ds ` \&
. ds ^ \&
. ds , \&
. ds ~ ~
. ds /
.\}
.if t \{\
. ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u"
. ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u'
. ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u'
. ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u'
. ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u'
. ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u'
.\}
. \" troff and (daisy-wheel) nroff accents
.ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V'
.ds 8 \h'\*(#H'\(*b\h'-\*(#H'
.ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#]
.ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H'
.ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u'
.ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#]
.ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#]
.ds ae a\h'-(\w'a'u*4/10)'e
.ds Ae A\h'-(\w'A'u*4/10)'E
. \" corrections for vroff
.if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u'
.if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u'
. \" for low resolution devices (crt and lpr)
.if \n(.H>23 .if \n(.V>19 \
\{\
. ds : e
. ds 8 ss
. ds o a
. ds d- d\h'-1'\(ga
. ds D- D\h'-1'\(hy
. ds th \o'bp'
. ds Th \o'LP'
. ds ae ae
. ds Ae AE
.\}
.rm #[ #] #H #V #F C
.\" ========================================================================
.\"
.IX Title "BN_BLINDING_new 3"
.TH BN_BLINDING_new 3 "2008-05-09" "0.9.9-dev" "OpenSSL"
.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_set_thread, BN_BLINDING_cmp_thread, BN_BLINDING_get_flags,
BN_BLINDING_set_flags, BN_BLINDING_create_param \- blinding related BIGNUM
functions.
.SH "LIBRARY"
libcrypto, -lcrypto
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/bn.h>
.Ve
.PP
.Vb 10
\& 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);
.Ve
.PP
.Vb 10
\& void BN_BLINDING_set_thread(BN_BLINDING *);
\& int BN_BLINDING_cmp_thread(const BN_BLINDING *,
\& const CRYPTO_THREADID *);
\& 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 amoung
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_set_thread()\fR and \fIBN_BLINDING_cmp_thread()\fR
set and compare the \*(L"thread id\*(R" of the \fB\s-1BN_BLINDING\s0\fR structure,
allowing users of the \fB\s-1BN_BLINDING\s0\fR structure to
provide proper locking if needed for multi-threaded use.
.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 occured.
.PP
\&\fIBN_BLINDING_get_thread_id()\fR returns the thread id (a \fBunsigned long\fR
value) or 0 if not set.
\&\fIBN_BLINDING_cmp_thread()\fR returns 0 if the thread id associated with the
\&\fB\s-1BN_BLINDING\s0\fR structure equals the provided thread id (which can be
obtained by \fICRYPTO_THREADID_set()\fR), otherwise it returns \-1 or +1
to indicate the thread ids are different (if the target architecture
supports ordering of thread ids, this follows the traditional \*(L"cmp\*(R"
semantics of \fImemcmp()\fR or \fIstrcmp()\fR).
.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"
\&\fIopenssl_bn\fR\|(3)
.SH "HISTORY"
.IX Header "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
.PP
BN_BLINDING_get_thread_idptr, BN_BLINDING_set_thread_idptr were first
introduced in OpenSSL 0.9.9
.PP
BN_BLINDING_get_thread_id, BN_BLINDING_set_thread_id,
BN_BLINDING_get_thread_idptr, BN_BLINDING_set_thread_idptr were all
deprecated in favour of BN_BLINDING_set_thread, BN_BLINDING_cmp_thread
which were introduced in OpenSSL 0.9.9
.SH "AUTHOR"
.IX Header "AUTHOR"
Nils Larsch for the OpenSSL project (http://www.openssl.org).