From 61ff35662049f02da8d2c0f54ef6e84f97c14b1a Mon Sep 17 00:00:00 2001
From: Paul Kehrer <paul.l.kehrer@gmail.com>
Date: Fri, 11 Mar 2016 22:51:27 -0400
Subject: Add AuthorityKeyIdentifier.from_issuer_subject_key_identifier

---
 src/cryptography/x509/extensions.py | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'src')

diff --git a/src/cryptography/x509/extensions.py b/src/cryptography/x509/extensions.py
index 0aa67212..87d2de1c 100644
--- a/src/cryptography/x509/extensions.py
+++ b/src/cryptography/x509/extensions.py
@@ -191,6 +191,14 @@ class AuthorityKeyIdentifier(object):
             authority_cert_serial_number=None
         )
 
+    @classmethod
+    def from_issuer_subject_key_identifier(cls, ski):
+        return cls(
+            key_identifier=ski.value.digest,
+            authority_cert_issuer=None,
+            authority_cert_serial_number=None
+        )
+
     def __repr__(self):
         return (
             "<AuthorityKeyIdentifier(key_identifier={0.key_identifier!r}, "
-- 
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