← Back
Editing: DH_meth_dup.3
.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35) .\" .\" 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 "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 \&\fBDH_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 \&\fBDH_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 \&\fBDH_meth_free()\fR destroys a \fB\s-1DH_METHOD\s0\fR structure and frees up any memory associated with it. .PP \&\fBDH_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. \fBDH_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 \&\fBDH_meth_get_flags()\fR returns the current value of the flags associated with this \&\s-1DH_METHOD.\s0 \fBDH_meth_set_flags()\fR provides the ability to set these flags. .PP The functions \fBDH_meth_get0_app_data()\fR and \fBDH_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 \fBDH_meth_free()\fR. .PP \&\fBDH_meth_get_generate_key()\fR and \fBDH_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 \fBDH_generate_key()\fR. The parameter for the function has the same meaning as for \fBDH_generate_key()\fR. .PP \&\fBDH_meth_get_compute_key()\fR and \fBDH_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 \fBDH_compute_key()\fR. The parameters for the function have the same meaning as for \fBDH_compute_key()\fR. .PP \&\fBDH_meth_get_bn_mod_exp()\fR and \fBDH_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 \&\fBDH_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 \&\fBDH_meth_get_init()\fR and \fBDH_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 \fBDH_new()\fR (if the current default \&\s-1DH_METHOD\s0 is this one) or \fBDH_new_method()\fR. The \fBDH_new()\fR and \fBDH_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 \&\fBDH_meth_get_finish()\fR and \fBDH_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 \fBDH_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 \&\fBDH_meth_get_generate_params()\fR and \fBDH_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 \fBDH_generate_parameters_ex()\fR (or \&\fBDH_generate_parameters()\fR). The parameters for the function have the same meaning as for \fBDH_generate_parameters_ex()\fR. This function may be \s-1NULL.\s0 .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBDH_meth_new()\fR and \fBDH_meth_dup()\fR return the newly allocated \s-1DH_METHOD\s0 object or \s-1NULL\s0 on failure. .PP \&\fBDH_meth_get0_name()\fR and \fBDH_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 \&\fBDH_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" \&\fBDH_new\fR\|(3), \fBDH_new\fR\|(3), \fBDH_generate_parameters\fR\|(3), \fBDH_generate_key\fR\|(3), \&\fBDH_set_method\fR\|(3), \fBDH_size\fR\|(3), \fBDH_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>.
Save File
Cancel