pad block corrupted Exception while Decrypting audioRecord data

Issue

i am encrypting audio data in one android device using following function

private byte[] encrypt(byte[] plaintext) throws Exception
{
    Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
    SecretKeySpec keySpec = new SecretKeySpec(privateKeyByte, 0, privateKeyByte.length,"AES");
    IvParameterSpec ivSpec = new IvParameterSpec(IV);
    cipher.init(Cipher.ENCRYPT_MODE, keySpec, ivSpec);
    byte[] cipherText = cipher.doFinal(plaintext);
    return cipherText;
}

and decrypting on another android device using following

    private byte[] decrypt(byte[] cipherText)
{
    try {
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        SecretKeySpec keySpec = new SecretKeySpec(privateKeyByte, 0, privateKeyByte.length, "AES");
        IvParameterSpec ivSpec = new IvParameterSpec(IV);
        cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);
        return cipher.doFinal(cipherText);
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}

it is throwing pad block corrupt exception. What am I doing wrong? I am very sure that both of devices are having the same key and IV.

Solution

I changed pkc5Padding to NoPadding and it worked. not sure not having padding would make it insecure. But it worked.

Answered By - Devarsh Mavani