'\" t
.\"     Title: tor-gencert
.\"    Author: Nick Mathewson
.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
.\"      Date: 10/20/2016
.\"    Manual: Tor Manual
.\"    Source: Tor
.\"  Language: English
.\"
.TH "TOR\-GENCERT" "1" "10/20/2016" "Tor" "Tor Manual"
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.SH "NAME"
tor-gencert \- Generate certs and keys for Tor directory authorities
.SH "SYNOPSIS"
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\fBtor\-gencert\fR [\-h|\-\-help] [\-v] [\-r|\-\-reuse] [\-\-create\-identity\-key] [\-i \fIid_file\fR] [\-c \fIcert_file\fR] [\-m \fInum\fR] [\-a \fIaddress\fR:\fIport\fR]
.SH "DESCRIPTION"
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\fBtor\-gencert\fR generates certificates and private keys for use by Tor directory authorities running the v3 Tor directory protocol, as used by Tor 0\&.2\&.0 and later\&. If you are not running a directory authority, you don\(cqt need to use tor\-gencert\&.
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Every directory authority has a long term authority \fIidentity\fR \fIkey\fR (which is distinct from the identity key it uses as a Tor server); this key should be kept offline in a secure location\&. It is used to certify shorter\-lived \fIsigning\fR \fIkeys\fR, which are kept online and used by the directory authority to sign votes and consensus documents\&.
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After you use this program to generate a signing key and a certificate, copy those files to the keys subdirectory of your Tor process, and send Tor a SIGHUP signal\&. DO NOT COPY THE IDENTITY KEY\&.
.SH "OPTIONS"
.PP
\fB\-v\fR
.RS 4
Display verbose output\&.
.RE
.PP
\fB\-h\fR or \fB\-\-help\fR
.RS 4
Display help text and exit\&.
.RE
.PP
\fB\-r\fR or \fB\-\-reuse\fR
.RS 4
Generate a new certificate, but not a new signing key\&. This can be used to change the address or lifetime associated with a given key\&.
.RE
.PP
\fB\-\-create\-identity\-key\fR
.RS 4
Generate a new identity key\&. You should only use this option the first time you run tor\-gencert; in the future, you should use the identity key that\(cqs already there\&.
.RE
.PP
\fB\-i\fR \fIFILENAME\fR
.RS 4
Read the identity key from the specified file\&. If the file is not present and \-\-create\-identity\-key is provided, create the identity key in the specified file\&. Default: "\&./authority_identity_key"
.RE
.PP
\fB\-s\fR \fIFILENAME\fR
.RS 4
Write the signing key to the specified file\&. Default: "\&./authority_signing_key"
.RE
.PP
\fB\-c\fR \fIFILENAME\fR
.RS 4
Write the certificate to the specified file\&. Default: "\&./authority_certificate"
.RE
.PP
\fB\-m\fR \fINUM\fR
.RS 4
Number of months that the certificate should be valid\&. Default: 12\&.
.RE
.PP
\fB\-\-passphrase\-fd\fR \fIFILEDES\fR
.RS 4
Filedescriptor to read the passphrase from\&. Ends at the first NUL or newline\&. Default: read from the terminal\&.
.RE
.PP
\fB\-a\fR \fIaddress\fR:\fIport\fR
.RS 4
If provided, advertise the address:port combination as this authority\(cqs preferred directory port in its certificate\&. If the address is a hostname, the hostname is resolved to an IP before it\(cqs published\&.
.RE
.SH "BUGS"
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This probably doesn\(cqt run on Windows\&. That\(cqs not a big issue, since we don\(cqt really want authorities to be running on Windows anyway\&.
.SH "SEE ALSO"
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\fBtor\fR(1)
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See also the "dir\-spec\&.txt" file, distributed with Tor\&.
.SH "AUTHORS"
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.RS 4
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Roger Dingledine <arma@mit\&.edu>, Nick Mathewson <nickm@alum\&.mit\&.edu>\&.
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.SH "AUTHOR"
.PP
\fBNick Mathewson\fR
.RS 4
Author.
.RE