Android_verify/third_party/android-libs/share/man/man3/DSA_meth_new.3ossl

.\" Automatically generated by Pod::Man 4.14 (Pod::Simple 3.42)
.\"
.\" 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 >0, 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 "DSA_METH_NEW 3ossl"
.TH DSA_METH_NEW 3ossl "2024-09-03" "3.3.2" "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"
DSA_meth_new, DSA_meth_free, DSA_meth_dup, DSA_meth_get0_name,
DSA_meth_set1_name, DSA_meth_get_flags, DSA_meth_set_flags,
DSA_meth_get0_app_data, DSA_meth_set0_app_data, DSA_meth_get_sign,
DSA_meth_set_sign, DSA_meth_get_sign_setup, DSA_meth_set_sign_setup,
DSA_meth_get_verify, DSA_meth_set_verify, DSA_meth_get_mod_exp,
DSA_meth_set_mod_exp, DSA_meth_get_bn_mod_exp, DSA_meth_set_bn_mod_exp,
DSA_meth_get_init, DSA_meth_set_init, DSA_meth_get_finish, DSA_meth_set_finish,
DSA_meth_get_paramgen, DSA_meth_set_paramgen, DSA_meth_get_keygen,
DSA_meth_set_keygen \- Routines to build up DSA methods
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/dsa.h>
.Ve
.PP
The following functions have been deprecated since OpenSSL 3.0, and can be
hidden entirely by defining \fB\s-1OPENSSL_API_COMPAT\s0\fR with a suitable version value,
see \fBopenssl_user_macros\fR\|(7):
.PP
.Vb 1
\& DSA_METHOD *DSA_meth_new(const char *name, int flags);
\&
\& void DSA_meth_free(DSA_METHOD *dsam);
\&
\& DSA_METHOD *DSA_meth_dup(const DSA_METHOD *meth);
\&
\& const char *DSA_meth_get0_name(const DSA_METHOD *dsam);
\& int DSA_meth_set1_name(DSA_METHOD *dsam, const char *name);
\&
\& int DSA_meth_get_flags(const DSA_METHOD *dsam);
\& int DSA_meth_set_flags(DSA_METHOD *dsam, int flags);
\&
\& void *DSA_meth_get0_app_data(const DSA_METHOD *dsam);
\& int DSA_meth_set0_app_data(DSA_METHOD *dsam, void *app_data);
\&
\& DSA_SIG *(*DSA_meth_get_sign(const DSA_METHOD *dsam))(const unsigned char *,
\&                                                       int, DSA *);
\& int DSA_meth_set_sign(DSA_METHOD *dsam, DSA_SIG *(*sign)(const unsigned char *,
\&                                                          int, DSA *));
\&
\& int (*DSA_meth_get_sign_setup(const DSA_METHOD *dsam))(DSA *, BN_CTX *,$
\&                                                        BIGNUM **, BIGNUM **);
\& int DSA_meth_set_sign_setup(DSA_METHOD *dsam, int (*sign_setup)(DSA *, BN_CTX *,
\&                                                                 BIGNUM **, BIGNUM **));
\&
\& int (*DSA_meth_get_verify(const DSA_METHOD *dsam))(const unsigned char *,
\&                                                    int, DSA_SIG *, DSA *);
\& int DSA_meth_set_verify(DSA_METHOD *dsam, int (*verify)(const unsigned char *,
\&                                                         int, DSA_SIG *, DSA *));
\&
\& int (*DSA_meth_get_mod_exp(const DSA_METHOD *dsam))(DSA *dsa, BIGNUM *rr, BIGNUM *a1,
\&                                                     BIGNUM *p1, BIGNUM *a2, BIGNUM *p2,
\&                                                     BIGNUM *m, BN_CTX *ctx,
\&                                                     BN_MONT_CTX *in_mont);
\& int DSA_meth_set_mod_exp(DSA_METHOD *dsam, int (*mod_exp)(DSA *dsa, BIGNUM *rr,
\&                                                           BIGNUM *a1, BIGNUM *p1,
\&                                                           BIGNUM *a2, BIGNUM *p2,
\&                                                           BIGNUM *m, BN_CTX *ctx,
\&                                                           BN_MONT_CTX *mont));
\&
\& int (*DSA_meth_get_bn_mod_exp(const DSA_METHOD *dsam))(DSA *dsa, BIGNUM *r, BIGNUM *a,
\&                                                        const BIGNUM *p, const BIGNUM *m,
\&                                                        BN_CTX *ctx, BN_MONT_CTX *mont);
\& int DSA_meth_set_bn_mod_exp(DSA_METHOD *dsam, int (*bn_mod_exp)(DSA *dsa,
\&                                                                 BIGNUM *r,
\&                                                                 BIGNUM *a,
\&                                                                 const BIGNUM *p,
\&                                                                 const BIGNUM *m,
\&                                                                 BN_CTX *ctx,
\&                                                                 BN_MONT_CTX *mont));
\&
\& int (*DSA_meth_get_init(const DSA_METHOD *dsam))(DSA *);
\& int DSA_meth_set_init(DSA_METHOD *dsam, int (*init)(DSA *));
\&
\& int (*DSA_meth_get_finish(const DSA_METHOD *dsam))(DSA *);
\& int DSA_meth_set_finish(DSA_METHOD *dsam, int (*finish)(DSA *));
\&
\& int (*DSA_meth_get_paramgen(const DSA_METHOD *dsam))(DSA *, int,
\&                                                      const unsigned char *,
\&                                                      int, int *, unsigned long *,
\&                                                      BN_GENCB *);
\& int DSA_meth_set_paramgen(DSA_METHOD *dsam,
\&                           int (*paramgen)(DSA *, int, const unsigned char *,
\&                                           int, int *, unsigned long *, BN_GENCB *));
\&
\& int (*DSA_meth_get_keygen(const DSA_METHOD *dsam))(DSA *);
\& int DSA_meth_set_keygen(DSA_METHOD *dsam, int (*keygen)(DSA *));
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
All of the functions described on this page are deprecated.
Applications and extension implementations should instead use the
\&\s-1OSSL_PROVIDER\s0 APIs.
.PP
The \fB\s-1DSA_METHOD\s0\fR type is a structure used for the provision of custom \s-1DSA\s0
implementations. It provides a set of functions used by OpenSSL for the
implementation of the various \s-1DSA\s0 capabilities.
.PP
\&\fBDSA_meth_new()\fR creates a new \fB\s-1DSA_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-1DSA_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-1DSA\s0\fR object based on this \fB\s-1DSA_METHOD\s0\fR. Any
new \fB\s-1DSA\s0\fR object will have those flags set by default.
.PP
\&\fBDSA_meth_dup()\fR creates a duplicate copy of the \fB\s-1DSA_METHOD\s0\fR object passed as a
parameter. This might be useful for creating a new \fB\s-1DSA_METHOD\s0\fR based on an
existing one, but with some differences.
.PP
\&\fBDSA_meth_free()\fR destroys a \fB\s-1DSA_METHOD\s0\fR structure and frees up any memory
associated with it. If the argument is \s-1NULL,\s0 nothing is done.
.PP
\&\fBDSA_meth_get0_name()\fR will return a pointer to the name of this \s-1DSA_METHOD.\s0 This
is a pointer to the internal name string and so should not be freed by the
caller. \fBDSA_meth_set1_name()\fR sets the name of the \s-1DSA_METHOD\s0 to \fBname\fR. The
string is duplicated and the copy is stored in the \s-1DSA_METHOD\s0 structure, so the
caller remains responsible for freeing the memory associated with the name.
.PP
\&\fBDSA_meth_get_flags()\fR returns the current value of the flags associated with this
\&\s-1DSA_METHOD.\s0 \fBDSA_meth_set_flags()\fR provides the ability to set these flags.
.PP
The functions \fBDSA_meth_get0_app_data()\fR and \fBDSA_meth_set0_app_data()\fR provide the
ability to associate implementation specific data with the \s-1DSA_METHOD.\s0 It is
the application's responsibility to free this data before the \s-1DSA_METHOD\s0 is
freed via a call to \fBDSA_meth_free()\fR.
.PP
\&\fBDSA_meth_get_sign()\fR and \fBDSA_meth_set_sign()\fR get and set the function used for
creating a \s-1DSA\s0 signature respectively. This function will be
called in response to the application calling \fBDSA_do_sign()\fR (or \fBDSA_sign()\fR). The
parameters for the function have the same meaning as for \fBDSA_do_sign()\fR.
.PP
\&\fBDSA_meth_get_sign_setup()\fR and \fBDSA_meth_set_sign_setup()\fR get and set the function
used for precalculating the \s-1DSA\s0 signature values \fBk^\-1\fR and \fBr\fR. This function
will be called in response to the application calling \fBDSA_sign_setup()\fR. The
parameters for the function have the same meaning as for \fBDSA_sign_setup()\fR.
.PP
\&\fBDSA_meth_get_verify()\fR and \fBDSA_meth_set_verify()\fR get and set the function used
for verifying a \s-1DSA\s0 signature respectively. This function will be called in
response to the application calling \fBDSA_do_verify()\fR (or \fBDSA_verify()\fR). The
parameters for the function have the same meaning as for \fBDSA_do_verify()\fR.
.PP
\&\fBDSA_meth_get_mod_exp()\fR and \fBDSA_meth_set_mod_exp()\fR get and set the function used
for computing the following value:
.PP
.Vb 1
\& rr = a1^p1 * a2^p2 mod m
.Ve
.PP
This function will be called by the default OpenSSL method during verification
of a \s-1DSA\s0 signature. The result is stored in the \fBrr\fR parameter. This function
may be \s-1NULL.\s0
.PP
\&\fBDSA_meth_get_bn_mod_exp()\fR and \fBDSA_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
\&\fBDSA_sign_setup()\fR. The result is stored in the \fBr\fR parameter. This function
may be \s-1NULL.\s0
.PP
\&\fBDSA_meth_get_init()\fR and \fBDSA_meth_set_init()\fR get and set the function used
for creating a new \s-1DSA\s0 instance respectively. This function will be
called in response to the application calling \fBDSA_new()\fR (if the current default
\&\s-1DSA_METHOD\s0 is this one) or \fBDSA_new_method()\fR. The \fBDSA_new()\fR and \fBDSA_new_method()\fR
functions will allocate the memory for the new \s-1DSA\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
\&\fBDSA_meth_get_finish()\fR and \fBDSA_meth_set_finish()\fR get and set the function used
for destroying an instance of a \s-1DSA\s0 object respectively. This function will be
called in response to the application calling \fBDSA_free()\fR. A pointer to the \s-1DSA\s0
to be destroyed is passed as a parameter. The destroy function should be used
for \s-1DSA\s0 implementation specific clean up. The memory for the \s-1DSA\s0 itself should
not be freed by this function. This function may be \s-1NULL.\s0
.PP
\&\fBDSA_meth_get_paramgen()\fR and \fBDSA_meth_set_paramgen()\fR get and set the function
used for generating \s-1DSA\s0 parameters respectively. This function will be called in
response to the application calling \fBDSA_generate_parameters_ex()\fR (or
\&\fBDSA_generate_parameters()\fR). The parameters for the function have the same
meaning as for \fBDSA_generate_parameters_ex()\fR.
.PP
\&\fBDSA_meth_get_keygen()\fR and \fBDSA_meth_set_keygen()\fR get and set the function
used for generating a new \s-1DSA\s0 key pair respectively. This function will be
called in response to the application calling \fBDSA_generate_key()\fR. The parameter
for the function has the same meaning as for \fBDSA_generate_key()\fR.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBDSA_meth_new()\fR and \fBDSA_meth_dup()\fR return the newly allocated \s-1DSA_METHOD\s0 object
or \s-1NULL\s0 on failure.
.PP
\&\fBDSA_meth_get0_name()\fR and \fBDSA_meth_get_flags()\fR return the name and flags
associated with the \s-1DSA_METHOD\s0 respectively.
.PP
All other DSA_meth_get_*() functions return the appropriate function pointer
that has been set in the \s-1DSA_METHOD,\s0 or \s-1NULL\s0 if no such pointer has yet been
set.
.PP
\&\fBDSA_meth_set1_name()\fR and all DSA_meth_set_*() functions return 1 on success or
0 on failure.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBDSA_new\fR\|(3), \fBDSA_new\fR\|(3), \fBDSA_generate_parameters\fR\|(3), \fBDSA_generate_key\fR\|(3),
\&\fBDSA_dup_DH\fR\|(3), \fBDSA_do_sign\fR\|(3), \fBDSA_set_method\fR\|(3), \fBDSA_SIG_new\fR\|(3),
\&\fBDSA_sign\fR\|(3), \fBDSA_size\fR\|(3), \fBDSA_get0_pqg\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
The functions described here were deprecated in OpenSSL 3.0.
.PP
The functions described here were added in OpenSSL 1.1.0.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2016\-2024 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the Apache License 2.0 (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>.