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.\" ========================================================================
.\"
.IX Title "Authen::OATH 3pm"
.TH Authen::OATH 3pm "2016-07-20" "perl v5.22.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
Authen::OATH \- OATH One Time Passwords
.SH "VERSION"
.IX Header "VERSION"
version 2.0.0
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&    use Authen::OATH;
\&
\&    my $oath = Authen::OATH\->new();
\&    my $totp = $oath\->totp( \*(AqMySecretPassword\*(Aq );
\&    my $hotp = $oath\->hotp( \*(AqMyOtherSecretPassword\*(Aq );
.Ve
.PP
Parameters may be overridden when creating the new object:
.PP
.Vb 1
\&    my $oath = Authen::OATH\->new( digits => 8 );
.Ve
.PP
The three parameters are \*(L"digits\*(R", \*(L"digest\*(R", and \*(L"timestep.\*(R"
Timestep only applies to the \fItotp()\fR function.
.PP
While strictly speaking this is outside the specifications of
\&\s-1HOTP\s0 and \s-1TOTP,\s0 you can specify digests other than \s-1SHA1.\s0 For example:
.PP
.Vb 4
\&    my $oath = Authen::OATH\->new(
\&        digits => 10,
\&        digest => \*(AqDigest::MD6\*(Aq,
\&    );
.Ve
.PP
If you are using Google Authenticator, you'll want to decode your secret
*before* passing it to the \f(CW\*(C`totp\*(C'\fR method:
.PP
.Vb 1
\&    use Convert::Base32 qw( decode_base32 );
\&
\&    my $oath = Authen::OATH\->new;
\&    my $secret = \*(AqmySecret\*(Aq;
\&    my $otp = $oath\->totp(  decode_base32( $secret ) );
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Implementation of the \s-1HOTP\s0 and \s-1TOTP\s0 One Time Password algorithms
as defined by \s-1OATH \s0(http://www.openauthentication.org)
.PP
All necessary parameters are set by default, though these can be
overridden. Both \fItotp()\fR and \fIhtop()\fR have passed all of the test
vectors defined in the \s-1RFC\s0 documents for \s-1TOTP\s0 and \s-1HOTP.\s0
.PP
\&\fItotp()\fR and \fIhotp()\fR both default to returning 6 digits and using \s-1SHA1.\s0
As such, both can be called by passing only the secret key and a
valid \s-1OTP\s0 will be returned.
.SH "SUBROUTINES/METHODS"
.IX Header "SUBROUTINES/METHODS"
.SS "totp"
.IX Subsection "totp"
.Vb 1
\&    my $otp = $oath\->totp( $secret [, $manual_time ] );
.Ve
.PP
Manual time is an optional parameter. If it is not passed, the current
time is used. This is useful for testing purposes.
.SS "hotp"
.IX Subsection "hotp"
.Vb 1
\&    my $opt = $oath\->hotp( $secret, $counter );
.Ve
.PP
Both parameters are required.
.SS "_process"
.IX Subsection "_process"
This is an internal routine and is never called directly.
.SH "CAVEATS"
.IX Header "CAVEATS"
Please see the \s-1SYNOPSIS\s0 for how interaction with Google Authenticator.
.SH "AUTHOR"
.IX Header "AUTHOR"
Kurt Kincaid <kurt.kincaid@gmail.com>
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
This software is copyright (c) 2010 by Kurt Kincaid.
.PP
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.