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<?php |
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|
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// Do not allow the file to be called directly. |
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if ( ! defined( 'ABSPATH' ) ) { |
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exit; |
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} |
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|
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require_once dirname( __FILE__ ) . '/base32.php'; |
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|
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class TokenAuth6238 { |
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|
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/** |
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* Verify the code & token. |
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* |
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* @param string $secretkey Secret clue (base 32). |
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* @return bool True if success, false if failure |
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*/ |
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public static function verify( $secretkey, $code, $rangein30s = 3 ) { |
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$key = base32static::decode( $secretkey ); |
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$unixtimestamp = time() / 30; |
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|
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for ( $i = -( $rangein30s ); $i <= $rangein30s; $i++ ) { |
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$checktime = (int) ( $unixtimestamp + $i ); |
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$thiskey = self::oath_hotp( $key, $checktime ); |
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|
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if ( (int) $code == self::oath_truncate( $thiskey, 6 ) ) { |
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return true; |
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} |
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} |
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|
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return false; |
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} |
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|
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/** |
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* Generate the random clue/key. |
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* |
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* @param integer $length |
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* @return string |
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*/ |
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public static function generateRandomClue( $length = 16 ) { |
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$b32 = '234567QWERTYUIOPASDFGHJKLZXCVBNM'; |
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$s = ''; |
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for ( $i = 0; $i < $length; $i++ ) { |
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$s .= $b32[ mt_rand( 0, 31 ) ]; |
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} |
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|
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return $s; |
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} |
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|
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/** |
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* |
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* @param string $key |
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* @param integer $counter |
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* @return string |
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*/ |
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private static function oath_hotp( $key, $counter ) { |
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$cur_counter = array( 0, 0, 0, 0, 0, 0, 0, 0 ); |
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|
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for ( $i = 7; $i >= 0; $i-- ) { // C for unsigned char, * for repeating to the end of the input data |
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$cur_counter[ $i ] = pack( 'C*', $counter ); |
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$counter = $counter >> 8; |
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} |
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|
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$binary = implode( $cur_counter ); |
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|
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// Pad to 8 characters |
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str_pad( $binary, 8, chr( 0 ), STR_PAD_LEFT ); |
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return hash_hmac( 'sha1', $binary, $key ); |
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} |
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|
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/** |
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* Truncate |
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* |
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* @param string $hash |
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* @param integer $length |
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* @return boolean |
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*/ |
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private static function oath_truncate( $hash, $length = 6 ) { |
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$hashcharacters = str_split( $hash, 2 ); |
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|
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for ( $j = 0; $j < count( $hashcharacters ); $j++ ) { |
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$hmac_result[] = hexdec( $hashcharacters[ $j ] ); |
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} |
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|
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$offset = $hmac_result[19] & 0xf; |
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return ( |
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( ( $hmac_result[ $offset + 0 ] & 0x7f ) << 24 ) | |
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( ( $hmac_result[ $offset + 1 ] & 0xff ) << 16 ) | |
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( ( $hmac_result[ $offset + 2 ] & 0xff ) << 8 ) | |
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( $hmac_result[ $offset + 3 ] & 0xff ) |
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) % pow( 10, $length ); |
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} |
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} |
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|
