Changed default signature hash type to md5

Author: vuongxuongminh

src/Message/AbstractSignatureRequest.php

@@ -28,7 +28,7 @@ public function getData(): array
 
         $parameters = $this->getParameters();
         $parameters['vnp_SecureHash'] = $this->generateSignature(
-            $parameters['vnp_SecureHashType'] = 'SHA256'
+            $parameters['vnp_SecureHashType'] = 'md5'
         );
 
         unset($parameters['vnp_HashSecret'], $parameters['testMode']);

src/Message/Concerns/RequestSignature.php

@@ -21,7 +21,7 @@ trait RequestSignature
      * @param  string  $hashType
      * @return string
      */
-    protected function generateSignature($hashType = 'sha256'): string
+    protected function generateSignature($hashType = 'md5'): string
     {
         $data = [];
         $signature = new Signature(

src/Support/Signature.php

@@ -36,7 +36,7 @@ class Signature
      * @param  string  $hashType
      * @throws InvalidArgumentException
      */
-    public function __construct(string $hashSecret, string $hashType = 'sha256')
+    public function __construct(string $hashSecret, string $hashType = 'md5')
     {
         if (! $this->isSupportHashType($hashType)) {
             throw new InvalidArgumentException(sprintf('Hash type: `%s` is not supported by VNPay', $hashType));
@@ -57,9 +57,7 @@ public function generate(array $data): string
         ksort($data);
         $dataSign = $this->hashSecret.urldecode(http_build_query($data));
 
-        return strtoupper(
-            hash($this->hashType, $dataSign)
-        );
+        return hash($this->hashType, $dataSign);
     }
 
     /**