encryptVal method
Encrypt a plaintext value
Implementation
List encryptVal(String encKey, String plaintextVal) {
final key = Key.fromUtf8(encKey);
final iv = IV.fromLength(16);
final encrypter = Encrypter(AES(key));
final encryptVal = encrypter.encrypt(plaintextVal, iv: iv);
String encryptValStr = encryptVal.base64.toString();
return [encryptValStr, iv.base64];
}