| Current Path : /opt/cpanel/ea-openssl11/share/man/man3/ |
Linux gator3171.hostgator.com 4.19.286-203.ELK.el7.x86_64 #1 SMP Wed Jun 14 04:33:55 CDT 2023 x86_64 |
| Current File : //opt/cpanel/ea-openssl11/share/man/man3/DH_meth_set_generate_key.3 |
.\" Automatically generated by Pod::Man 2.27 (Pod::Simple 3.28)
.\"
.\" Standard preamble:
.\" ========================================================================
.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. \*(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-
.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" ''
. ds C`
. ds C'
'br\}
.\"
.\" Escape single quotes in literal strings from groff's Unicode transform.
.ie \n(.g .ds Aq \(aq
.el .ds Aq '
.\"
.\" If the F register is turned on, we'll generate index entries on stderr for
.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
.\" entries marked with X<> in POD. Of course, you'll have to process the
.\" output yourself in some meaningful fashion.
.\"
.\" Avoid warning from groff about undefined register 'F'.
.de IX
..
.nr rF 0
.if \n(.g .if rF .nr rF 1
.if (\n(rF:(\n(.g==0)) \{
. if \nF \{
. de IX
. tm Index:\\$1\t\\n%\t"\\$2"
..
. if !\nF==2 \{
. nr % 0
. nr F 2
. \}
. \}
.\}
.rr rF
.\"
.\" 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 "DH_METH_NEW 3"
.TH DH_METH_NEW 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
DH_meth_new, DH_meth_free, DH_meth_dup, DH_meth_get0_name, DH_meth_set1_name, DH_meth_get_flags, DH_meth_set_flags, DH_meth_get0_app_data, DH_meth_set0_app_data, DH_meth_get_generate_key, DH_meth_set_generate_key, DH_meth_get_compute_key, DH_meth_set_compute_key, DH_meth_get_bn_mod_exp, DH_meth_set_bn_mod_exp, DH_meth_get_init, DH_meth_set_init, DH_meth_get_finish, DH_meth_set_finish, DH_meth_get_generate_params, DH_meth_set_generate_params \- Routines to build up DH methods
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/dh.h>
\&
\& DH_METHOD *DH_meth_new(const char *name, int flags);
\&
\& void DH_meth_free(DH_METHOD *dhm);
\&
\& DH_METHOD *DH_meth_dup(const DH_METHOD *dhm);
\&
\& const char *DH_meth_get0_name(const DH_METHOD *dhm);
\& int DH_meth_set1_name(DH_METHOD *dhm, const char *name);
\&
\& int DH_meth_get_flags(const DH_METHOD *dhm);
\& int DH_meth_set_flags(DH_METHOD *dhm, int flags);
\&
\& void *DH_meth_get0_app_data(const DH_METHOD *dhm);
\& int DH_meth_set0_app_data(DH_METHOD *dhm, void *app_data);
\&
\& int (*DH_meth_get_generate_key(const DH_METHOD *dhm))(DH *);
\& int DH_meth_set_generate_key(DH_METHOD *dhm, int (*generate_key)(DH *));
\&
\& int (*DH_meth_get_compute_key(const DH_METHOD *dhm))
\& (unsigned char *key, const BIGNUM *pub_key, DH *dh);
\& int DH_meth_set_compute_key(DH_METHOD *dhm,
\& int (*compute_key)(unsigned char *key, const BIGNUM *pub_key, DH *dh));
\&
\& int (*DH_meth_get_bn_mod_exp(const DH_METHOD *dhm))
\& (const DH *dh, BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
\& const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx);
\& int DH_meth_set_bn_mod_exp(DH_METHOD *dhm,
\& int (*bn_mod_exp)(const DH *dh, BIGNUM *r, const BIGNUM *a,
\& const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx,
\& BN_MONT_CTX *m_ctx));
\&
\& int (*DH_meth_get_init(const DH_METHOD *dhm))(DH *);
\& int DH_meth_set_init(DH_METHOD *dhm, int (*init)(DH *));
\&
\& int (*DH_meth_get_finish(const DH_METHOD *dhm))(DH *);
\& int DH_meth_set_finish(DH_METHOD *dhm, int (*finish)(DH *));
\&
\& int (*DH_meth_get_generate_params(const DH_METHOD *dhm))
\& (DH *, int, int, BN_GENCB *);
\& int DH_meth_set_generate_params(DH_METHOD *dhm,
\& int (*generate_params)(DH *, int, int, BN_GENCB *));
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \fB\s-1DH_METHOD\s0\fR type is a structure used for the provision of custom \s-1DH\s0
implementations. It provides a set of functions used by OpenSSL for the
implementation of the various \s-1DH\s0 capabilities.
.PP
\&\fIDH_meth_new()\fR creates a new \fB\s-1DH_METHOD\s0\fR structure. It should be given a
unique \fBname\fR and a set of \fBflags\fR. The \fBname\fR should be a \s-1NULL\s0 terminated
string, which will be duplicated and stored in the \fB\s-1DH_METHOD\s0\fR object. It is
the callers responsibility to free the original string. The flags will be used
during the construction of a new \fB\s-1DH\s0\fR object based on this \fB\s-1DH_METHOD\s0\fR. Any
new \fB\s-1DH\s0\fR object will have those flags set by default.
.PP
\&\fIDH_meth_dup()\fR creates a duplicate copy of the \fB\s-1DH_METHOD\s0\fR object passed as a
parameter. This might be useful for creating a new \fB\s-1DH_METHOD\s0\fR based on an
existing one, but with some differences.
.PP
\&\fIDH_meth_free()\fR destroys a \fB\s-1DH_METHOD\s0\fR structure and frees up any memory
associated with it.
.PP
\&\fIDH_meth_get0_name()\fR will return a pointer to the name of this \s-1DH_METHOD.\s0 This
is a pointer to the internal name string and so should not be freed by the
caller. \fIDH_meth_set1_name()\fR sets the name of the \s-1DH_METHOD\s0 to \fBname\fR. The
string is duplicated and the copy is stored in the \s-1DH_METHOD\s0 structure, so the
caller remains responsible for freeing the memory associated with the name.
.PP
\&\fIDH_meth_get_flags()\fR returns the current value of the flags associated with this
\&\s-1DH_METHOD.\s0 \fIDH_meth_set_flags()\fR provides the ability to set these flags.
.PP
The functions \fIDH_meth_get0_app_data()\fR and \fIDH_meth_set0_app_data()\fR provide the
ability to associate implementation specific data with the \s-1DH_METHOD.\s0 It is
the application's responsibility to free this data before the \s-1DH_METHOD\s0 is
freed via a call to \fIDH_meth_free()\fR.
.PP
\&\fIDH_meth_get_generate_key()\fR and \fIDH_meth_set_generate_key()\fR get and set the
function used for generating a new \s-1DH\s0 key pair respectively. This function will
be called in response to the application calling \fIDH_generate_key()\fR. The
parameter for the function has the same meaning as for \fIDH_generate_key()\fR.
.PP
\&\fIDH_meth_get_compute_key()\fR and \fIDH_meth_set_compute_key()\fR get and set the
function used for computing a new \s-1DH\s0 shared secret respectively. This function
will be called in response to the application calling \fIDH_compute_key()\fR. The
parameters for the function have the same meaning as for \fIDH_compute_key()\fR.
.PP
\&\fIDH_meth_get_bn_mod_exp()\fR and \fIDH_meth_set_bn_mod_exp()\fR get and set the function
used for computing the following value:
.PP
.Vb 1
\& r = a ^ p mod m
.Ve
.PP
This function will be called by the default OpenSSL function for
\&\fIDH_generate_key()\fR. The result is stored in the \fBr\fR parameter. This function
may be \s-1NULL\s0 unless using the default generate key function, in which case it
must be present.
.PP
\&\fIDH_meth_get_init()\fR and \fIDH_meth_set_init()\fR get and set the function used
for creating a new \s-1DH\s0 instance respectively. This function will be
called in response to the application calling \fIDH_new()\fR (if the current default
\&\s-1DH_METHOD\s0 is this one) or \fIDH_new_method()\fR. The \fIDH_new()\fR and \fIDH_new_method()\fR
functions will allocate the memory for the new \s-1DH\s0 object, and a pointer to this
newly allocated structure will be passed as a parameter to the function. This
function may be \s-1NULL.\s0
.PP
\&\fIDH_meth_get_finish()\fR and \fIDH_meth_set_finish()\fR get and set the function used
for destroying an instance of a \s-1DH\s0 object respectively. This function will be
called in response to the application calling \fIDH_free()\fR. A pointer to the \s-1DH\s0
to be destroyed is passed as a parameter. The destroy function should be used
for \s-1DH\s0 implementation specific clean up. The memory for the \s-1DH\s0 itself should
not be freed by this function. This function may be \s-1NULL.\s0
.PP
\&\fIDH_meth_get_generate_params()\fR and \fIDH_meth_set_generate_params()\fR get and set the
function used for generating \s-1DH\s0 parameters respectively. This function will be
called in response to the application calling \fIDH_generate_parameters_ex()\fR (or
\&\fIDH_generate_parameters()\fR). The parameters for the function have the same
meaning as for \fIDH_generate_parameters_ex()\fR. This function may be \s-1NULL.\s0
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fIDH_meth_new()\fR and \fIDH_meth_dup()\fR return the newly allocated \s-1DH_METHOD\s0 object
or \s-1NULL\s0 on failure.
.PP
\&\fIDH_meth_get0_name()\fR and \fIDH_meth_get_flags()\fR return the name and flags
associated with the \s-1DH_METHOD\s0 respectively.
.PP
All other DH_meth_get_*() functions return the appropriate function pointer
that has been set in the \s-1DH_METHOD,\s0 or \s-1NULL\s0 if no such pointer has yet been
set.
.PP
\&\fIDH_meth_set1_name()\fR and all DH_meth_set_*() functions return 1 on success or
0 on failure.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIDH_new\fR\|(3), \fIDH_new\fR\|(3), \fIDH_generate_parameters\fR\|(3), \fIDH_generate_key\fR\|(3),
\&\fIDH_set_method\fR\|(3), \fIDH_size\fR\|(3), \fIDH_get0_pqg\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
The functions described here were added in OpenSSL 1.1.0.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2016\-2018 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.