diff --git a/src/classes/RSA.php b/src/classes/RSA.php
index 5432854..cac09ae 100644
--- a/src/classes/RSA.php
+++ b/src/classes/RSA.php
@@ -10,10 +10,20 @@ namespace encrypt\classes;
 class RSA implements \encrypt\RSA
 {
 
+    /**
+     * 使用公钥操作
+     */
     const USE_PUBLIC = 1;
 
+    /**
+     * 使用私钥操作
+     */
     const USE_PRIVATE = 2;
 
+    /**
+     * 密钥配置
+     * @var array
+     */
     private $config = [];
 
     /**
@@ -64,9 +74,9 @@ class RSA implements \encrypt\RSA
      * @param int $type
      * @return null|string
      */
-    public function encrypt(string $data, $type = RSA::USE_PRIVATE): ?string
+    public function encrypt(string $data, $type = self::USE_PRIVATE): ?string
     {
-        if (RSA::USE_PRIVATE === $type) {
+        if (self::USE_PRIVATE === $type) {
             $func = 'openssl_private_encrypt';
             $key = $this->privateKey();
         } else {
@@ -74,8 +84,13 @@ class RSA implements \encrypt\RSA
             $key = $this->publicKey();
         }
 
-        /** @var string $encrypted */
-        return $func($data, $encrypted, $key) ? base64_encode($encrypted) : null;
+        $string = '';
+        foreach (str_split($data, 117) as $chunk) {
+            /** @var string $encrypted */
+            $string .= ($func($chunk, $encrypted, $key) ? base64_encode($encrypted) : null);
+        }
+
+        return $string;
     }
 
     /**
@@ -84,9 +99,9 @@ class RSA implements \encrypt\RSA
      * @param int $type
      * @return null|string
      */
-    public function decrypt(string $data, $type = RSA::USE_PRIVATE): ?string
+    public function decrypt(string $data, $type = self::USE_PRIVATE): ?string
     {
-        if (RSA::USE_PRIVATE === $type) {
+        if (self::USE_PRIVATE === $type) {
             $func = 'openssl_private_decrypt';
             $key = $this->privateKey();
         } else {
@@ -94,6 +109,12 @@ class RSA implements \encrypt\RSA
             $key = $this->publicKey();
         }
 
-        return $func(base64_decode($data), $data, $key) ? $data : null;
+        $string = '';
+        foreach (str_split($data, 172) as $chunk) {
+            /** @var string $decryptData */
+            $string .= ($func(base64_decode($chunk), $decryptData, $key) ? $decryptData : null);
+        }
+
+        return $string;
     }
 }