mathtls.py 文件源码

def __init__(self, key, msg = None, digestmod = None):
        """Create a new MAC_SSL object.

        key:       key for the keyed hash object.
        msg:       Initial input for the hash, if provided.
        digestmod: A module supporting PEP 247. Defaults to the md5 module.
        """
        if digestmod is None:
            import md5
            digestmod = md5

        if key == None: #TREVNEW - for faster copying
            return      #TREVNEW

        self.digestmod = digestmod
        self.outer = digestmod.new()
        self.inner = digestmod.new()
        self.digest_size = digestmod.digest_size

        ipad = "\x36" * 40
        opad = "\x5C" * 40

        self.inner.update(key)
        self.inner.update(ipad)
        self.outer.update(key)
        self.outer.update(opad)
        if msg is not None:
            self.update(msg)