From 8b687180391afc37c59eb57ae0fc5a77a2d894cc Mon Sep 17 00:00:00 2001
From: Bob Halley <halley@dnspython.org>
Date: Mon, 1 Jun 2020 10:46:23 -0700
Subject: [PATCH] RRSIG digestable might as well be right even if it is useless

---
 dns/rdtypes/ANY/RRSIG.py | 8 ++++++++
 tests/test_rdata.py      | 4 ++--
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/dns/rdtypes/ANY/RRSIG.py b/dns/rdtypes/ANY/RRSIG.py
index 09965ce8..c7b9e7a1 100644
--- a/dns/rdtypes/ANY/RRSIG.py
+++ b/dns/rdtypes/ANY/RRSIG.py
@@ -122,6 +122,14 @@ class RRSIG(dns.rdata.Rdata):
         self.signer.to_wire(file, None, origin)
         file.write(self.signature)
 
+    def to_digestable(self, origin=None):
+        return struct.pack('!HBBIIIH', self.type_covered,
+                           self.algorithm, self.labels,
+                           self.original_ttl, self.expiration,
+                           self.inception, self.key_tag) + \
+                           self.signer.to_digestable(origin) + \
+                           self.signature
+
     @classmethod
     def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin=None):
         header = struct.unpack('!HBBIIIH', wire[current: current + 18])
diff --git a/tests/test_rdata.py b/tests/test_rdata.py
index a88b977d..ed2c3f3b 100644
--- a/tests/test_rdata.py
+++ b/tests/test_rdata.py
@@ -139,8 +139,6 @@ class RdataTestCase(unittest.TestCase):
         #
         #   types that don't have names: HINFO
         #
-        #   types where the canonical form isn't relevant: RRSIG
-        #
         cases = [
             ('SOA', 'NAME NAME 1 2 3 4 5'),
             ('AFSDB', '0 NAME'),
@@ -156,6 +154,8 @@ class RdataTestCase(unittest.TestCase):
             ('RP', 'NAME NAME'),
             ('RT', '0 NAME'),
             ('SRV', '0 0 0 NAME'),
+            ('RRSIG',
+             'A 1 3 3600 20200701000000 20200601000000 1 NAME Ym9ndXM=')
         ]
         for rdtype, text in cases:
             upper_origin = dns.name.from_text('EXAMPLE')
-- 
2.47.3