rsa.py 文件源码

def validate(self, message):
        """Verify the signature of self RSA fulfillment.

        The signature of self RSA fulfillment is verified against the
        provided message and the condition's public modulus.

        Args:
            message (bytes): Message to verify.

        Returns:
            bool: Whether self fulfillment is valid.

        """
        if not isinstance(message, bytes):
            raise Exception(
                'Message must be provided as bytes, was: ' + message)

        public_numbers = RSAPublicNumbers(
            PUBLIC_EXPONENT,
            int.from_bytes(self.modulus, byteorder='big'),
        )
        public_key = public_numbers.public_key(default_backend())
        verifier = public_key.verifier(
            self.signature,
            padding.PSS(
                mgf=padding.MGF1(hashes.SHA256()),
                salt_length=SALT_LENGTH,
            ),
            hashes.SHA256()
        )
        verifier.update(message)
        try:
            verifier.verify()
        except InvalidSignature as exc:
            raise ValidationError('Invalid RSA signature') from exc

        return True