How to emulate Javascript crypto AES
I have the following Javascript code in a web page:
var decrypt = function (text, password){
var decipher = crypto.createDecipher('aes-256-cbc',password);
var dec = decipher.update(text,'hex','utf8');
dec += decipher.final('utf8');
return dec;
}
, and I'm trying to reproduce it using Java, using the following:
static MessageDigest MD5 = null;
static {
try {
MD5 = MessageDigest.getInstance("MD5");
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException(e);
}
}
public static String decrypt(String cipherText, String password)
throws GeneralSecurityException, UnsupportedEncodingException {
byte[] passwordBytes = hexStringToByteArray(password);
byte[] keyBytes = MD5.digest(passwordBytes);
byte[] keyAndPassword = new byte[keyBytes.length + passwordBytes.length];
System.arraycopy(keyBytes, 0, keyAndPassword, 0, keyBytes.length);
System.arraycopy(passwordBytes, 0, keyAndPassword, keyBytes.length, passwordBytes.length);
byte[] ivBytes = MD5.digest(keyAndPassword);
SecretKeySpec key = new SecretKeySpec(keyBytes, "AES");
IvParameterSpec iv = new IvParameterSpec(ivBytes);
byte[] encrypted = hexStringToByteArray(cipherText);
Cipher aesCBC = Cipher.getInstance("AES/CBC/PKCS5Padding");
aesCBC.init(Cipher.DECRYPT_MODE, key, iv);
byte[] decryptedData = aesCBC.doFinal(encrypted);
return new String(decryptedData, StandardCharsets.UTF_8);
}
public static byte[] hexStringToByteArray(String s) {
int len = s.length();
byte[] data = new byte[len / 2];
for (int i = 0; i < len; i += 2) {
data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4) + Character.digit(s.charAt(i + 1), 16));
}
return data;
}
which pieces bits from:
, but I get "javax.crypto.BadPaddingException: Given final block not properly padded", on parameters which the JS function decodes correctly.
Note that Given final block not properly padded does not answer this question- as it is obvious that this is a padding problem but the solution is to replicate whatever the JS crypto lib does, which is not well documented.
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