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Edit File : DH_meth_get_bn_mod_exp.3 \| Size : 11.88 KB
.\" 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++. 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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>. Back

Edit File : DH_meth_get_bn_mod_exp.3 | Size : 11.88 KB

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.\" ========================================================================
.\"
.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>.

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