Java AES Decryption: random chars & message at the end
I have a problem with decrypting a message using AES. At the end when I expect a message, eg
ala123
Instead of that I receive sth like:
...6�b}7�k�8�vFP�8~%��_zժF��FW��O_e���ó������������ala123
The message I pass to encryption is built as:
The question is why at the end I eventually receive my expected message, but with a lot of rubbish chars at the beggining?
My encryption code is:
private static final String AES_TOKEN = "my_very_secret_token";
// encrypted is base64 string
public String decrypt(String encrypted) throws Exception {
byte[] decrypted = Base64.getDecoder().decode(encrypted);
return new String(aesDecrypt(decrypted), "UTF-8");
}
private byte[] aesDecrypt(byte[] message) throws Exception {
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
byte[] token = MessageDigest.getInstance("SHA-256").digest(AES_TOKEN.getBytes());
SecretKeySpec secretKey = new SecretKeySpec(token, "AES");
IvParameterSpec iv = new IvParameterSpec(Arrays.copyOf(message, 16));
cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);
return cipher.doFinal(message);
}
It looks like you aren't removing the IV from the beginning of message after reading it in to iv . That would explain the garbage being at the start of the decrypted message.
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