decryptVal method
Decrypt a ciphertext value
Implementation
String decryptVal(String encKey, String encVal, String ivVal) {
final key = Key.fromUtf8(encKey);
//final iv = IV.fromLength(16);
final iv = IV.fromBase64(ivVal);
final encrypter = Encrypter(AES(key));
final ecc = Encrypted.from64(encVal);
final plaintextVal = encrypter.decrypt(ecc, iv: iv);
return plaintextVal;
}