def extend_message(message, extension, init, key_len):
''' Length based extension attack on a md4 keyed authentication code
Arguments:
message: Original message
extension: Message to append
init: list of md4 init variables
key_len: length of key
'''
original_len = key_len + len(message)
glue_padding = get_glue_padding(original_len)
original_len += len(glue_padding)
new_message = message + glue_padding + extension
new_hash = md4(extension, init, original_len).hexdigest()
return (new_message, new_hash)
def extend_message(message, extension, init, key_len):
''' Length based extension attack on a md4 keyed authentication code
Arguments:
message: Original message
extension: Message to append
init: list of md4 init variables
key_len: length of key
'''
original_len = key_len + len(message)
glue_padding = get_glue_padding(original_len)
original_len += len(glue_padding)
new_message = message + glue_padding + extension
new_hash = md4(extension, init, original_len).hexdigest()
return (new_message, new_hash)
def mac(self, text):
return md4(self.key + text).hexdigest()
def mac(self, text):
return md4(self.key + text).hexdigest()