Version 3.1.0

.github/workflows/ci.yml

@@ -3,44 +3,13 @@ name: CI
 on: [push]
 
 jobs:
-  old:
-    name: PHP ${{ matrix.php-versions }} Test on ${{ matrix.operating-system }}
-    runs-on: ${{ matrix.operating-system }}
-    strategy:
-      matrix:
-        operating-system: ['ubuntu-16.04']
-        php-versions: ['7.0']
-        phpunit-versions: ['7.5.20']
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v2
-
-      - name: Setup PHP
-        uses: shivammathur/setup-php@v2
-        with:
-          php-version: ${{ matrix.php-versions }}
-          extensions: mbstring, intl
-          ini-values: post_max_size=256M, max_execution_time=180
-          tools: psalm, phpunit:${{ matrix.phpunit-versions }}
-
-      - name: Fix permissions
-        run: sudo chmod -R 0777 .
-
-      - name: Install dependencies
-        run: composer self-update --1; composer install
-
-      - name: PHPUnit tests
-        uses: php-actions/phpunit@v2
-        with:
-          memory_limit: 256M
-
   moderate:
     name: PHP ${{ matrix.php-versions }} Test on ${{ matrix.operating-system }}
     runs-on: ${{ matrix.operating-system }}
     strategy:
       matrix:
         operating-system: ['ubuntu-latest']
-        php-versions: ['7.1', '7.2', '7.3']
+        php-versions: ['7.3']
         phpunit-versions: ['latest']
     steps:
       - name: Checkout

CHANGELOG.md

@@ -1,3 +1,19 @@
+# Version 3.1.0 (2021-06-02)
+
+* Added `needsRehash()` method.
+* Added support for `$hashOptions` in `hashAndEncrypt()` to support
+  custom bcrypt costs. (This can also be used to support custom Argon2id
+  parameters, should the default ever change in PHP.)
+
+# Version 3.0.3 (2021-06-02)
+
+* Support PHP 8.
+* The previous tag (v3.0.2) was erroneous and erased.
+
+# Version 3.0.1 (2016-05-20)
+
+* Fixed `autoload.php`
+
 # Version 3.0.0 (2016-05-18)
 
 * Set minimum PHP version to 7.0

README.md

@@ -54,6 +54,20 @@ if (isset($_POST['password'])) {
 }
 ```
 
+### Determine if a re-hash is necessary
+
+```php
+use ParagonIE\PasswordLock\PasswordLock;
+/**
+ * @var string $encryptedPwhash
+ * @var Defuse\Crypto\Key $key
+ */
+
+if (PasswordLock::needsRehash($encryptedPwhash, $key)) {
+    // Recalculate PasswordLock::hashAndEncrypt()
+}
+```
+
 ### Re-encrypt a hash with a different encryption key
 
 ```php

composer.json

@@ -28,7 +28,7 @@
         ]
     },
     "require": {
-        "php": "^7|^8",
+        "php": "^7.3|^8",
         "defuse/php-encryption": "^2",
         "paragonie/constant_time_encoding": "^2"
     },

src/PasswordLock.php

@@ -15,25 +15,47 @@
  */
 class PasswordLock
 {
+    /**
+     * @ref https://www.php.net/manual/en/function.password-hash.php
+     */
+    const OPTIONS_DEFAULT_BCRYPT = ['cost' => 12];
+    const OPTIONS_DEFAULT_ARGON2ID = [
+        'memory_cost' => 65536,
+        'time_cost' => 4,
+        'threads' => 1
+    ];
+
     /**
      * 1. Hash password using bcrypt-base64-SHA256
      * 2. Encrypt-then-MAC the hash
      *
      * @param string $password
      * @param Key $aesKey
+     * @param ?array $hashOptions
      * @return string
      *
      * @throws EnvironmentIsBrokenException
+     * @throws \InvalidArgumentException
      * @psalm-suppress InvalidArgument
      */
-    public static function hashAndEncrypt(string $password, Key $aesKey): string
-    {
+    public static function hashAndEncrypt(
+        string $password,
+        Key $aesKey,
+        ?array $hashOptions = null
+    ): string {
+        if (is_null($hashOptions)) {
+            $hashOptions = static::getDefaultOptions();
+        }
+        if (array_key_exists('salt', $hashOptions)) {
+            throw new \InvalidArgumentException('Explicit salts are unsupported.');
+        }
         /** @var string $hash */
         $hash = \password_hash(
             Base64::encode(
                 \hash('sha384', $password, true)
             ),
-            PASSWORD_DEFAULT
+            PASSWORD_DEFAULT,
+            $hashOptions
         );
         if (!\is_string($hash)) {
             throw new EnvironmentIsBrokenException("Unknown hashing error.");
@@ -53,7 +75,11 @@ public static function hashAndEncrypt(string $password, Key $aesKey): string
      * @throws EnvironmentIsBrokenException
      * @throws WrongKeyOrModifiedCiphertextException
      */
-    public static function decryptAndVerifyLegacy(string $password, string $ciphertext, string $aesKey): bool
+    public static function decryptAndVerifyLegacy(
+        string $password,
+        string $ciphertext,
+        string $aesKey
+    ): bool
     {
         if (Binary::safeStrlen($aesKey) !== 16) {
             throw new \InvalidArgumentException("Encryption keys must be 16 bytes long");
@@ -102,6 +128,50 @@ public static function decryptAndVerify(string $password, string $ciphertext, Ke
         );
     }
 
+    /**
+     * @return array<string, int>
+     *
+     * @psalm-suppress TypeDoesNotContainType
+     */
+    protected static function getDefaultOptions(): array
+    {
+        // Future-proofing:
+        if (PASSWORD_DEFAULT === PASSWORD_ARGON2ID) {
+            return self::OPTIONS_DEFAULT_ARGON2ID;
+        }
+        return self::OPTIONS_DEFAULT_BCRYPT;
+    }
+
+    /**
+     * Decrypt the ciphertext and ascertain if the stored password needs to be rehashed?
+     *
+     * @param string $ciphertext
+     * @param Key $aesKey
+     * @param ?array $hashOptions
+     * @return bool
+     *
+     * @throws EnvironmentIsBrokenException
+     * @throws WrongKeyOrModifiedCiphertextException
+     */
+    public static function needsRehash(
+        string $ciphertext,
+        Key $aesKey,
+        ?array $hashOptions = null
+    ): bool {
+        if (is_null($hashOptions)) {
+            $hashOptions = static::getDefaultOptions();
+        }
+        $hash = Crypto::decrypt(
+            $ciphertext,
+            $aesKey
+        );
+        if (!\is_string($hash)) {
+            throw new EnvironmentIsBrokenException("Unknown hashing error.");
+        }
+        /** @psalm-suppress InvalidArgument */
+        return password_needs_rehash($hash, PASSWORD_DEFAULT, $hashOptions);
+    }
+
     /**
      * Key rotation method -- decrypt with your old key then re-encrypt with your new key
      *

tests/PasswordLockTest.php

@@ -41,4 +41,13 @@ public function testBitflip()
         }
         $this->assertTrue($failed, 'Bitflips should break the decryption');
     }
+
+    public function testNeedsRehash()
+    {
+        $lowCost = ['cost' => 8];
+        $key = Key::createNewRandomKey();
+        $password = PasswordLock::hashAndEncrypt('YELLOW SUBMARINE', $key, $lowCost);
+        $this->assertTrue(PasswordLock::needsRehash($password, $key));
+        $this->assertFalse(PasswordLock::needsRehash($password, $key, $lowCost));
+    }
 }