Review

finding-6

org/apache/http/impl/auth/NTLMEngineImpl.java

lmResponse(byte[], byte[])

class NTLMEngineImpl {
    /**
     * Creates the LM Response from the given hash and Type 2 challenge.
     *
     * @param hash
     *            The LM or NTLM Hash.
     * @param challenge
     *            The server challenge from the Type 2 message.
     *
     * @return The response (either LM or NTLM, depending on the provided hash).
     */
    private static byte[] lmResponse(byte[] hash, byte[] challenge) throws NTLMEngineException {
        try {
            byte[] keyBytes = new byte[21];
            System.arraycopy(hash, 0, keyBytes, 0, 16);
            Key lowKey = createDESKey(keyBytes, 0);
            Key middleKey = createDESKey(keyBytes, 7);
            Key highKey = createDESKey(keyBytes, 14);
            Cipher des = Cipher.getInstance("DES/ECB/NoPadding");
            des.init(Cipher.ENCRYPT_MODE, lowKey);
            byte[] lowResponse = des.doFinal(challenge);
            des.init(Cipher.ENCRYPT_MODE, middleKey);
            byte[] middleResponse = des.doFinal(challenge);
            des.init(Cipher.ENCRYPT_MODE, highKey);
            byte[] highResponse = des.doFinal(challenge);
            byte[] lmResponse = new byte[24];
            System.arraycopy(lowResponse, 0, lmResponse, 0, 8);
            System.arraycopy(middleResponse, 0, lmResponse, 8, 8);
            System.arraycopy(highResponse, 0, lmResponse, 16, 8);
            return lmResponse;
        } catch (Exception e) {
            throw new NTLMEngineException(e.getMessage(), e);
        }
    }

}