更新RSA部分注释

src/RSA.php

@@ -8,7 +8,7 @@ interface RSA
 
     public function privateKey();
 
-    public function encrypt(string $data): ?string;
+    public function encrypt(string $data): string;
 
-    public function decrypt(string $data): ?string;
+    public function decrypt(string $data): string;
 }

src/classes/RSA.php

@@ -38,33 +38,35 @@ class RSA implements \encrypt\RSA
     {
         $this->config = $config;
         if (!isset($this->config['public_key'], $this->config['private_key'])) {
-            throw new \Exception('公钥私钥参数错误');
+            throw new \Exception('密钥参数错误');
         }
     }
 
     /**
      * 获取公钥
-     * @return string
+     * @return null|resource
      */
     public function publicKey()
     {
         if (!is_file($this->config['public_key'])) {
-            return '';
+            return null;
         }
         $content = file_get_contents($this->config['public_key']);
+
         return openssl_pkey_get_public($content);
     }
 
     /**
      * 获取私钥
-     * @return string
+     * @return null|resource
      */
     public function privateKey()
     {
         if (!is_file($this->config['private_key'])) {
-            return '';
+            return null;
         }
         $content = file_get_contents($this->config['private_key']);
+
         return openssl_pkey_get_private($content);
     }
 
@@ -72,9 +74,9 @@ class RSA implements \encrypt\RSA
      * 加密数据
      * @param string $data
      * @param int $type
-     * @return null|string
+     * @return string
      */
-    public function encrypt(string $data, $type = self::USE_PRIVATE): ?string
+    public function encrypt(string $data, int $type = self::USE_PRIVATE): string
     {
         if (self::USE_PRIVATE === $type) {
             $func = 'openssl_private_encrypt';
@@ -86,8 +88,8 @@ class RSA implements \encrypt\RSA
 
         $string = '';
         foreach (str_split($data, 117) as $chunk) {
-            /** @var string $encrypted */
-            $string .= ($func($chunk, $encrypted, $key) ? base64_encode($encrypted) : null);
+            /** @var string $encryptData */
+            $string .= ($func($chunk, $encryptData, $key) ? base64_encode($encryptData) : null);
         }
 
         return $string;
@@ -97,9 +99,9 @@ class RSA implements \encrypt\RSA
      * 解密数据
      * @param string $data
      * @param int $type
-     * @return null|string
+     * @return string
      */
-    public function decrypt(string $data, $type = self::USE_PRIVATE): ?string
+    public function decrypt(string $data, int $type = self::USE_PRIVATE): string
     {
         if (self::USE_PRIVATE === $type) {
             $func = 'openssl_private_decrypt';