EgCmA8Ua

1	//proposed function for decryption
2	public static void decryptAESCBC(
3			String inputFile, 
4			String outputFile, 
5			byte[] key, 
6			byte[] initialIV)
7					throws NoSuchAlgorithmException, NoSuchProviderException, NoSuchPaddingException, InvalidKeyException,
8			InvalidAlgorithmParameterException, IllegalBlockSizeException, ShortBufferException, BadPaddingException,
9			IOException {
10
11		//decrypt the input file using AES in CBC
12		//the file was encrypted without using padding - didn't need it
13
14		FileOutputStream fos = new FileOutputStream(outputFile);
15		byte[] content = Files.readAllBytes(Paths.get(inputFile));
16		
17		Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
18		IvParameterSpec ivSpec = new IvParameterSpec(initialIV);
19		SecretKey secret = new SecretKeySpec(key, "AES");
20		cipher.init(Cipher.DECRYPT_MODE, secret, ivSpec);
21		
22		byte[] output = cipher.doFinal(content);
23		fos.write(output);
24	}
25
26......................
27decryptAESCBC("EncryptedMessage.cipher", "OriginalMessage.txt", AES_KEY, IV);
28......................