import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

public class Main
{
    private static final String key = "B8AA9688DDD6528E86D8EEB45F866908";
    private static final String IV =  "C5250301101055084D4D4D4D4D4D4D4D";
    private static final String encrypted = "3F1EC0BB524BEEA88234B44D7D9F7888010E24593CAD21E27CE9E15AD82E215235AB08041AC46F6E19B8BF8A0BCA66840E3B7288699BDB9F7E81A85F3152E76161AEFEFCBF9F8F5A067161DBDF48D9EEE7091DEAA6C7D78CEC1E5831E3372A98";

    // convert bytes to hex string

	private static final char[] HEX_ARRAY = "0123456789ABCDEF".toCharArray();

	public static String bytesToHex(byte[] bytes)
	{
	    char[] hexChars = new char[bytes.length * 2];
    	for (int j = 0; j < bytes.length; j++)
    	{
        	int v = bytes[j] & 0xFF;
	        hexChars[j * 2] = HEX_ARRAY[v >>> 4];
    	    hexChars[j * 2 + 1] = HEX_ARRAY[v & 0x0F];
	    }
	    return new String(hexChars);
	}

    // convert hex string to bytes

	private static byte[] hexToBytes(final String encoded)
	{
        if ((encoded.length() % 2) != 0)
            throw new IllegalArgumentException("Input string must contain an even number of characters");

        final byte result[] = new byte[encoded.length() / 2];
        final char enc[] = encoded.toCharArray();
        for (int i = 0; i < enc.length; i += 2)
        {
            StringBuilder curr = new StringBuilder(2);
            curr.append(enc[i]).append(enc[i + 1]);
            result[i/2] = (byte) Integer.parseInt(curr.toString(), 16);
        }
        return result;
	}

    public static void main(String[] args) 
    {
    	byte[] key_bytes = hexToBytes(key);
    	byte[] IV_bytes = hexToBytes(IV);
    	byte[] encrypted_bytes = hexToBytes(encrypted);
      	byte[] decrypted_bytes = { };

      	System.out.println("Key:       " + bytesToHex(key_bytes));
      	System.out.println("IV:        " + bytesToHex(IV_bytes));
      	System.out.println("Encrypted: " + bytesToHex(encrypted_bytes));

      	// AES decryption

        try
        {
		    String cipherType = "AES/CBC/NoPadding";
		    Cipher cipher;
    	    IvParameterSpec ivSpec = new IvParameterSpec(IV_bytes);
	        SecretKeySpec skeySpec = new SecretKeySpec(key_bytes, "AES");

	        cipher = Cipher.getInstance(cipherType);

            cipher.init(Cipher.DECRYPT_MODE, skeySpec, ivSpec);

            decrypted_bytes = cipher.doFinal(encrypted_bytes);
        }
        catch (Exception ex)
        {
            ex.printStackTrace();
        }

      	System.out.println("Decrypted: " + bytesToHex(decrypted_bytes));
    }
}