What to pass in cipher.doFinal in Android/Java?

Question

Android code

String apiResponse = \"EcUZvMif

Method:

protected void decryptDataWithAES(String apiResponse,         


        

Answer 1

You are trying to decrypt the "key", I think you need to decrypt the apiResponse

Also you need the exact same IV the message was encrypted with, otherwise you won't be able to decrypt

Answer 2

Here is a static method to decrypt using AES with secretKey

private final static String AES_PADDING = "AES/ECB/PKCS5PADDING"; //this need to be same as DECRYPTION 
private String secretKey = "Your secret key"; //your secret key

//DecryptString
@SuppressLint("GetInstance")
public static String AESDecryptionString(String encryptedStringData) {
    Cipher decipher = null;
    byte[] encryptedString = encryptedStringData.getBytes(StandardCharsets.ISO_8859_1);
    String returnData = encryptedStringData;
    try {
        decipher = Cipher.getInstance(AES_PADDING);
    } catch (NoSuchAlgorithmException | NoSuchPaddingException e) {
        e.printStackTrace();
    }
    byte[] decryption;
    try {
        assert decipher != null;
        decipher.init(Cipher.DECRYPT_MODE, secretKey);
        decryption = decipher.doFinal(encryptedString);
        returnData = new String(decryption);
    } catch (InvalidKeyException | IllegalBlockSizeException | BadPaddingException e) {
        e.printStackTrace();
    }
    return returnData;
}

You can also use my library to encrypt/decrypt string using AES