Merge #354: PM-sig-verification: also accept lowercase hostid as valid.

078b2e2 Message-signature-verification: also accept lowercase hostid as valid.     The hostid upper/lowercase seems can be different depending     on how someone connects to an IRC server (via TOR, clearnet,     etc.). This leads to message signature verification failures,     if the receiving counterparty has a differently capitalized id. (Alex Cato)

jmclient/jmclient/client_protocol.py

@@ -110,6 +110,8 @@ class JMClientProtocol(amp.AMP):
                                     hashlen, max_encoded, hostid):
         verif_result = True
         if not btc.ecdsa_verify(str(msg), sig, pubkey):
+            # workaround for hostid, which sometimes is lowercase-only for some IRC connections
+            if not btc.ecdsa_verify(str(msg[:-len(hostid)] + hostid.lower()), sig, pubkey):
                 jlog.debug("nick signature verification failed, ignoring: " + str(nick))
                 verif_result = False
         #check that nick matches hash of pubkey