AES encrypt/decrypt with Bouncy Castle provider [duplicate]

Here is my implementation of a AES 256 encrypt and decrypt, developed with the native library of JDK 5:

public static String encrypt(String key, String toEncrypt) throws Exception { Key skeySpec = generateKeySpec(key); Cipher cipher = Cipher.getInstance("AES"); cipher.init(Cipher.ENCRYPT_MODE, skeySpec); byte[] encrypted = cipher.doFinal(toEncrypt.getBytes()); byte[] encryptedValue = Base64.encodeBase64(encrypted); return new String(encryptedValue); } public static String decrypt(String key, String encrypted) throws Exception { Key skeySpec = generateKeySpec(key); Cipher cipher = Cipher.getInstance("AES"); cipher.init(Cipher.DECRYPT_MODE, skeySpec); byte[] decodedBytes = Base64.decodeBase64(encrypted.getBytes()); byte[] original = cipher.doFinal(decodedBytes); return new String(original); } 

I want to implement the same methods with the Boucy Castle API (Java): I've searched a lot, tested a lot, without results ... can someone help me?

Thanks

1 Answer

You would either use

Security.addProvider(new BouncyCastleProvider()); Cipher cipher = Cipher.getInstance("AES", "BC"); 

or else

Cipher cipher = Cipher.getInstance("AES", new BouncyCastleProvider()); 

That said, Cipher.getInstance("AES") uses Electronic Codebook, which is insecure. You either want Cipher Block Chaining (Cipher.getInstance("AES/CBC/PKCS5Padding")) or Counter (Cipher.getInstance("AES/CTR/NoPadding")) modes; they are both secure, the primary difference being that CBC requires padding while CTR does not.