This patch adds two fuzzing tests to the dkim package:
1) Fuzz the sign-verify cycle, checking we can verify any message we
sign.
2) Fuzz the message we verify, returning valid keys for any domain so it
gets past the key fetching, and exercises a substantial part of the
verification process.
The first test already found two issues, which were fixed in the
previous patches.
Alberto Bertogli
4b0b31a749