OathTrait::oathHotp() - Code Metrics - 2amigos/2fa-library - Measure and Improve Code Quality continuously with Scrutinizer

OathTrait::oathHotp() A
last analyzed 2020-01-31 22:43 UTC

↳ Parent: OathTrait

Complexity

Conditions	1
Paths	1

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
dl	0
loc	8
rs	10
c	0
b	0
f	0
cc	1
nc	1
nop	2

<?php

/*
 * This file is part of the 2amigos/2fa-library project.
 *
 * (c) 2amigOS! <http://2amigos.us/>
 *
 * For the full copyright and license information, please view
 * the LICENSE file that was distributed with this source code.
 */

namespace Da\TwoFA\Traits;

trait OathTrait
{
    /**
     * @var int the length of the time based one time password token generated. Defaults to 6.
     */
    protected $tokenLength = 6;

    /**
     * Takes the secret key and the timestamp and returns the one time password.
     *
     * @param string $seed    the secret key in binary form
     * @param string $counter the time as returned by getTimestamp
     *
     * @return string
     */
    protected function oathHotp(string $seed, string $counter): string
    {
        // Counter must be 64-bit int
        $bin_counter = pack('N*', 0, $counter);
        $hash = hash_hmac('sha1', $bin_counter, $seed, true);

        return str_pad($this->oathTruncate($hash), $this->tokenLength, '0', STR_PAD_LEFT);
    }

    /**
     * Extracts the OTP from the SHA1 hash.
     *
     * @param string $hash
     *
     * @return int
     **/
    protected function oathTruncate(string $hash): int
    {
        $offset = ord($hash[19]) & 0xf;
        $temp = unpack('N', substr($hash, $offset, 4));

        return substr($temp[1] & 0x7fffffff, -$this->tokenLength);
    }
}


1			<?php
2
3			/*
4			* This file is part of the 2amigos/2fa-library project.
5			*
6			* (c) 2amigOS! <http://2amigos.us/>
7			*
8			* For the full copyright and license information, please view
9			* the LICENSE file that was distributed with this source code.
10			*/
11
12			namespace Da\TwoFA\Traits;
13
14			trait OathTrait
15			{
16			/**
17			* @var int the length of the time based one time password token generated. Defaults to 6.
18			*/
19			protected $tokenLength = 6;
20
21			/**
22			* Takes the secret key and the timestamp and returns the one time password.
23			*
24			* @param string $seed the secret key in binary form
25			* @param string $counter the time as returned by getTimestamp
26			*
27			* @return string
28			*/
29			protected function oathHotp(string $seed, string $counter): string
30			{
31			// Counter must be 64-bit int
32			$bin_counter = pack('N*', 0, $counter);
33			$hash = hash_hmac('sha1', $bin_counter, $seed, true);
34
35			return str_pad($this->oathTruncate($hash), $this->tokenLength, '0', STR_PAD_LEFT);
36			}
37
38			/**
39			* Extracts the OTP from the SHA1 hash.
40			*
41			* @param string $hash
42			*
43			* @return int
44			**/
45			protected function oathTruncate(string $hash): int
46			{
47			$offset = ord($hash[19]) & 0xf;
48			$temp = unpack('N', substr($hash, $offset, 4));
49
50			return substr($temp[1] & 0x7fffffff, -$this->tokenLength);
51			}
52			}
53

2amigos / 2fa-library

OathTrait::oathHotp() A last analyzed 2020-01-31 22:43 UTC

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OathTrait::oathHotp() A
last analyzed 2020-01-31 22:43 UTC