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54 lines
1.3 KiB
54 lines
1.3 KiB
package Lemonldap::NG::Common::TOTP;
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# This module is inspired by Auth::GoogleAuth written by Gryphon Shafer
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# <gryphon@cpan.org>
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use strict;
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use Mouse;
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use Convert::Base32 qw(decode_base32 encode_base32);
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use Crypt::URandom;
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use Digest::HMAC_SHA1 'hmac_sha1_hex';
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our $VERSION = '2.0.2';
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# Verify that TOTP $code matches with $secret
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sub verifyCode {
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my ( $self, $interval, $range, $digits, $secret, $code ) = @_;
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my $s = eval { decode_base32($secret) };
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if ($@) {
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$self->logger->error('Bad characters in TOTP secret');
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return -1;
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}
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for ( 0 .. $range ) {
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if ( $code eq $self->_code( $s, $_, $interval, $digits ) ) {
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return 1;
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}
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}
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return 0;
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}
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# Internal subroutine that calculates TOTP code using $secret and $interval
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sub _code {
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my ( $self, $secret, $r, $interval, $digits ) = @_;
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my $hmac = hmac_sha1_hex(
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pack( 'H*',
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sprintf( '%016x', int( ( time - $r * $interval ) / $interval ) ) ),
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$secret,
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);
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return sprintf(
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'%0' . $digits . 'd',
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(
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hex( substr( $hmac, hex( substr( $hmac, -1 ) ) * 2, 8 ) ) &
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0x7fffffff
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) % 10**$digits
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);
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}
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# Simply generate new base32 secret
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sub newSecret {
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my ($self) = @_;
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return encode_base32( Crypt::URandom::urandom(20) );
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}
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1;
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