From fd8fd63e1b0e29b79097638c48f8bd7c287d9965 Mon Sep 17 00:00:00 2001
From: Jack Ma <jackma@alibaba.com>
Date: Tue, 12 May 2020 10:36:32 -0700
Subject: [PATCH] Skip SDA if the card doesn't support it

---
 emv/dataAuthentication.js | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/emv/dataAuthentication.js b/emv/dataAuthentication.js
index 0c95f0d..ab54458 100644
--- a/emv/dataAuthentication.js
+++ b/emv/dataAuthentication.js
@@ -177,6 +177,11 @@ DataAuthentication.prototype.retrieveIssuerPublicKey = function() {
  * @param {Key} key the Issuer Public Key
 */
 DataAuthentication.prototype.verifySSAD = function(issuerPublicKeyModulus) {
+	var SSAD = this.emv.cardDE[0x93];
+	if (typeof(SSAD) == "undefined") {
+		print("<-----------------------------SDA is not supported on this card------------------------------>\n");
+		return;
+	}
 	var issuerPublicKeyModulus =  issuerPublicKeyModulus;
 	var key = new Key();
 	key.setType(Key.PUBLIC);