使用Bouncy Castle进行字节数组编码+解码的结果不同

Question

使用Java BouncyCastle库加密和解密字节数组。注意到加密 - 解密循环结果数组在结束时占用冗余零字节的问题。

public static void main(String[] args) throws IOException {
    Security.addProvider(new BouncyCastleProvider());
    File f = new File("C:/~Test/a.txt");
    byte[] bytes = FileUtils.readFileToByteArray(f);
    byte[] encrypt = encrypt(bytes, "3".getBytes());
    byte[] decrypt = decrypt(encrypt, "3".getBytes());
    boolean equals = Arrays.equals(bytes, decrypt);
}

public static byte[] processEncoding(boolean isEncrypt, byte[] inBytes, byte[] key) {
    PaddedBufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(
            new AESEngine()));
    cipher.init(isEncrypt, new KeyParameter(key));
    byte[] outBytes = new byte[cipher.getOutputSize(inBytes.length)];
    int len = cipher.processBytes(inBytes, 0, inBytes.length, outBytes, 0);
    try {
        cipher.doFinal(outBytes, len);
    } catch (CryptoException e) {
        System.out.println("Exception: " + e.toString());
    }
    return outBytes;
}

public static byte[] encrypt(byte[] inBytes, byte[] key) {
    String hash = getHash(key);
    byte[] bytes = Arrays.copyOfRange(hash.getBytes(), 0, 32);
    return processEncoding(true, inBytes, bytes);
}

public static byte[] decrypt(byte[] inBytes, byte[] key) {
    String hash = getHash(key);
    byte[] bytes = Arrays.copyOfRange(hash.getBytes(), 0, 32);
    return processEncoding(false, inBytes, bytes);
}

有谁知道如何解决这个问题？感谢。