Enlarge _oid2txt buffer to handle larger OIDs (#3612)
The OpenSSL manual recommends a buffer size of 80 for OBJ_oid2txt:
https://www.openssl.org/docs/crypto/OBJ_nid2ln.html#return_values.
But OIDs longer than this occur in real life (e.g. Active Directory
makes some very long OIDs). If the length of the stringified OID
exceeds the buffer size, allocate a new buffer that is big enough to
hold the stringified OID, and re-do the conversion into the new
buffer.
diff --git a/docs/development/test-vectors.rst b/docs/development/test-vectors.rst
index 868619a..a1d8b11 100644
--- a/docs/development/test-vectors.rst
+++ b/docs/development/test-vectors.rst
@@ -156,6 +156,9 @@
RSA with SHA1.
* ``badssl-sct.pem`` - A certificate with the certificate transparency signed
certificate timestamp extension.
+* ``bigoid.pem`` - A certificate with a rather long OID in the
+ Certificate Policies extension. We need to make sure we can parse
+ long OIDs.
Custom X.509 Vectors
~~~~~~~~~~~~~~~~~~~~