Return a list of the data of the signature files.
        Only v1 / JAR Signing.

        :rtype: list of bytes

def get_signatures(self):
        """
        Return a list of the data of the signature files.
        Only v1 / JAR Signing.

        :rtype: list of bytes
        """
        signature_expr = re.compile(r"^(META-INF/)(.*)(\.RSA|\.EC|\.DSA)$")
        signature_datas = []

        for i in self.get_files():
            if signature_expr.search(i):
                signature_datas.append(self.get_file(i))

        return signature_datas