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<?php declare(strict_types=1);
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/**
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* OpensslKeyGenerator.php
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*
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* PHP version 7
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*
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* @category Dcrypt
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* @package Dcrypt
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* @author Michael Meyer (mmeyer2k) <[email protected]>
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* @license http://opensource.org/licenses/MIT The MIT License (MIT)
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* @link https://github.com/mmeyer2k/dcrypt
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*/
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namespace Dcrypt;
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use Dcrypt\Exceptions\InvalidKeyException;
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use Dcrypt\Exceptions\InvalidPasswordException;
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/**
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* Provides key derivation functions
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*
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* @category Dcrypt
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* @package Dcrypt
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* @author Michael Meyer (mmeyer2k) <[email protected]>
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* @license http://opensource.org/licenses/MIT The MIT License (MIT)
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* @link https://github.com/mmeyer2k/dcrypt
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*/
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final class OpensslKeyGenerator
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{
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/**
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* @var string
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*/
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private $key;
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/**
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* @var string
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*/
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private $algo;
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/**
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* @var string
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*/
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private $ivr;
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/**
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* @var string
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*/
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private $cipher;
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/**
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* OpensslKeyGenerator constructor.
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*
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* @param string $algo
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* @param string $passkey
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* @param string $cipher
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* @param string $ivr
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* @param int $cost
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*/
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public function __construct(string $algo, string $passkey, string $cipher, string $ivr, int $cost)
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{
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// When cost is 0 then we are in key mode
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if ($cost === 0) {
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// Attempt to decode the passkey
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$passkey = \base64_decode($passkey);
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// Make sure key was properly decoded and meets minimum required length
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if (Str::strlen($passkey) < 256) {
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throw new InvalidKeyException("Key must be at least 2048 bits long and base64 encoded.");
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}
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// Store the key as what was supplied
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$this->key = $passkey;
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} else {
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// Make sure that the user is not attempting to use a key in password word mode
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if (Str::strlen($passkey) >= 256) {
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throw new InvalidPasswordException("Passwords must be less than 2048 bits (256 bytes) long.");
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}
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// Derive the key from the password and store in object
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$this->key = \hash_pbkdf2($algo, $passkey, $ivr, $cost, 0, true);
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}
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// Store the cipher string
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$this->cipher = $cipher;
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// Store algo in object
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$this->algo = $algo;
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// Store init vector in object
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$this->ivr = $ivr;
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}
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/**
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* Generate the authentication key
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*
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* @return string
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*/
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public function authenticationKey(): string
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{
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return $this->deriveKey(__FUNCTION__);
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}
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/**
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* Generate the encryption key
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*
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* @return string
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*/
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public function encryptionKey(): string
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{
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return $this->deriveKey(__FUNCTION__);
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}
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/**
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* Derive a key with differing authinfo strings
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*
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* @param string $info
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* @return string
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* @throws \Exception
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*/
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public function deriveKey(string $info): string
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{
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$info = $info . '|' . $this->cipher;
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$key = \hash_hkdf($this->algo, $this->key, 0, $info, $this->ivr);
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if ($key === false) {
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throw new Exceptions\InvalidAlgoException("Hash algo $this->algo is not supported by hash_hkdf.");
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}
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return $key;
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}
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/**
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* Generate a new key that meets requirements for dcrypt
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*
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* @param int $size
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* @return string
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* @throws Exceptions\InvalidKeyException
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*/
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public static function newKey(int $size = 2048): string
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{
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if ($size < 2048) {
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throw new InvalidKeyException('Key must be at least 2048 bits long.');
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}
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if ($size % 8 !== 0) {
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throw new InvalidKeyException('Key must be divisible by 8.');
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}
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return \base64_encode(\random_bytes($size / 8));
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}
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} |
mmeyer2k /
dcrypt
