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<?php namespace jakobo\HOTP; /** * The HOTPResult Class converts an HOTP item to various forms * Supported formats include hex, decimal, string, and HOTP * @author Jakob Heuser (firstname)@felocity.com * @copyright 2011-2020 * @license BSD-3-Clause * @version 1.0 */ class HOTPResult { protected $hash; protected $decimal; protected $hex; /** * Build an HOTP Result * @param string $value the value to construct with * @codeCoverageIgnore */ public function __construct( string $value ) { // store raw $this->hash = $value; } /** * Returns the string version of the HOTP * @return string */ public function toString(): string { return $this->hash; } /** * Returns the hex version of the HOTP * @return string */ public function toHex(): string { if( !$this->hex ) { $this->hex = dechex( $this->toDec() ); } return $this->hex; } /** * Returns the decimal version of the HOTP * @return int */ public function toDec(): int { if( !$this->decimal ) { // store calculate decimal $hmac_result = []; // Convert to decimal foreach ( str_split( $this->hash,2 ) as $hex ) { $hmac_result[] = hexdec($hex); } $offset = $hmac_result[19] & 0xf; $this->decimal = ( ( ( $hmac_result[$offset+0] & 0x7f ) << 24 ) | ( ( $hmac_result[$offset+1] & 0xff ) << 16 ) | ( ( $hmac_result[$offset+2] & 0xff ) << 8 ) | ( $hmac_result[$offset+3] & 0xff ) ); } return $this->decimal; } /** * Returns the truncated decimal form of the HOTP * @param int $length the length of the HOTP to return * @return string */ public function toHOTP( int $length ): string { $str = str_pad( $this->toDec(), $length, "0", STR_PAD_LEFT ); return substr( $str, ( -1 * $length ) ); } }
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