Changes to support AES GCM 128 & 192 decryption

Author: Rajmohan-Rajagopal

lib/mcapi/crypto/jwe-crypto.js

@@ -122,6 +122,12 @@ function JweCrypto(config) {
     let decryptionEncoding = JSON.parse(jweHeader).enc;
     let gcmMode = true;
     switch (decryptionEncoding) {
+      case "A128GCM":
+        decryptionEncoding = "AES-128-GCM";
+        break;
+      case "A192GCM":
+        decryptionEncoding = "AES-192-GCM";
+        break;
       case "A256GCM":
         decryptionEncoding = "AES-256-GCM";
         break;