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73 lines
2.7 KiB
73 lines
2.7 KiB
'\" t
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.\" Title: zmq_curve_public
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.\" Author: [see the "AUTHORS" section]
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.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
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.\" Date: 02/18/2017
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.\" Manual: 0MQ Manual
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.\" Source: 0MQ 4.2.2
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.\" Language: English
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.\"
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.TH "ZMQ_CURVE_PUBLIC" "3" "02/18/2017" "0MQ 4\&.2\&.2" "0MQ Manual"
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.\" -----------------------------------------------------------------
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.\" * Define some portability stuff
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.\" -----------------------------------------------------------------
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.\" http://bugs.debian.org/507673
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.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.ie \n(.g .ds Aq \(aq
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.el .ds Aq '
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.\" -----------------------------------------------------------------
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.\" * set default formatting
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.\" -----------------------------------------------------------------
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.\" disable hyphenation
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.nh
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.\" disable justification (adjust text to left margin only)
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.ad l
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.\" -----------------------------------------------------------------
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.\" * MAIN CONTENT STARTS HERE *
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.\" -----------------------------------------------------------------
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.SH "NAME"
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zmq_curve_public \- derive the public key from a private key
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.SH "SYNOPSIS"
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.sp
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\fBint zmq_curve_public (char *z85_public_key, char *z85_secret_key);\fR
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.SH "DESCRIPTION"
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.sp
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The \fIzmq_curve_public()\fR function shall derive the public key from a private key\&. The caller provides two buffers, each at least 41 octets large\&. In z85_secret_key the caller shall provide the private key, and the function will store the public key in z85_public_key\&. The keys are encoded using \fBzmq_z85_encode\fR(3)\&.
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.SH "RETURN VALUE"
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.sp
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The \fIzmq_curve_public()\fR function shall return 0 if successful, else it shall return \-1 and set \fIerrno\fR to one of the values defined below\&.
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.SH "ERRORS"
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.PP
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\fBENOTSUP\fR
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.RS 4
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The libzmq library was not built with cryptographic support (libsodium)\&.
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.RE
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.SH "EXAMPLE"
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.PP
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\fBDeriving the public key from a CURVE private key\fR.
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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char public_key [41];
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char secret_key [41];
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int rc = zmq_curve_keypair (public_key, secret_key);
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assert (rc == 0);
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char derived_public[41];
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rc = zmq_curve_public (derived_public, secret_key);
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assert (rc == 0);
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assert (!strcmp (derived_public, public_key));
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.SH "SEE ALSO"
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.sp
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\fBzmq_z85_decode\fR(3) \fBzmq_z85_encode\fR(3) \fBzmq_curve_keypair\fR(3) \fBzmq_curve\fR(7)
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.SH "AUTHORS"
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.sp
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This page was written by the 0MQ community\&. To make a change please read the 0MQ Contribution Policy at \m[blue]\fBhttp://www\&.zeromq\&.org/docs:contributing\fR\m[]\&.
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