public void decrypt(int[] buffer)
        {
            int nLen = buffer.length;
            long lTemp;
            for (int nI = 0; nI < nLen; nI +=2)
            {
                // decrypt a temporary 64bit block
                lTemp = intArrayToLong(buffer, nI);
                lTemp = decryptBlock(lTemp);
                longToIntArray(lTemp, buffer, nI);
            }
        }
decrypts an int buffer (should be aligned to an
two integer border)
@param buffer buffer to decrypt
xmppserver/src/main/java/org/jivesoftware/util/Blowfish.java