'\" t
.\"     Title: kcapi_kpp_dh_setparam_pkcs3
.\"    Author: 
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\"      Date: November 2020
.\"    Manual: Programming Interface
.\"    Source: libkcapi Manual 1.2.1
.\"  Language: English
.\"
.TH "KCAPI_KPP_DH_SETPARA" "3" "November 2020" "libkcapi Manual 1\&.2\&.1" "Programming Interface"
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.SH "NAME"
kcapi_kpp_dh_setparam_pkcs3 \- set the PG parameters using PKCS3 format
.SH "SYNOPSIS"
.HP \w'int\ kcapi_kpp_dh_setparam_pkcs3('u
.BI "int kcapi_kpp_dh_setparam_pkcs3(struct\ kcapi_handle\ *\ " "handle" ", const\ uint8_t\ *\ " "pkcs3" ", uint32_t\ " "pkcs3len" ");"
.SH "ARGUMENTS"
.PP
\fIhandle\fR
.RS 4
[in] cipher handle
.RE
.PP
\fIpkcs3\fR
.RS 4
[in] parameter buffer in DER format
.RE
.PP
\fIpkcs3len\fR
.RS 4
[in] length of key buffer
.RE
.SH "DESCRIPTION"
.PP
With this function, the caller sets the PG parameters for subsequent cipher operations\&.
.PP
The parameter set must be in DER format as follows
.PP
SEQUENCE { prime INTEGER ({ dh_get_p }), base INTEGER ({ dh_get_g }) }
.PP
The following command generates such parameter set where the output
.SH "FILE CONTENT IS HAS THE CORRECT DER STRUCTURE"
.PP
.PP
openssl dhparam \-outform DER \-out dhparam\&.der 2048
.PP
Note, this function defines that the subsequent key generation and shared secret operation performs an FFC Diffie\-Hellman operation\&.
.PP
After the caller provided the key, the caller may destroy the parameter as it is now maintained by the kernel\&.
.PP
\fIreturn\fR
upon success the value of the maximum size for the KPP operation is returned (e\&.g\&. the prime size); a negative errno\-style error code if an error occurred
.SH "AUTHOR"
.PP
\fBStephan Mueller\fR <\&smueller@chronox.de\&>
.RS 4
Author.
.RE
.SH "COPYRIGHT"
.br