- if (Utils->ChallengeResponse && sha256 && !challenge.empty())
- {
- if (proto_version < 1202)
- {
- /* This is how HMAC is done in InspIRCd 1.2:
- *
- * sha256( (pass xor 0x5c) + sha256((pass xor 0x36) + m) )
- *
- * 5c and 36 were chosen as part of the HMAC standard, because they
- * flip the bits in a way likely to strengthen the function.
- */
- std::string hmac1, hmac2;
-
- for (size_t n = 0; n < password.length(); n++)
- {
- hmac1.push_back(static_cast<char>(password[n] ^ 0x5C));
- hmac2.push_back(static_cast<char>(password[n] ^ 0x36));
- }
-
- hmac2.append(challenge);
- hmac2 = sha256->hexsum(hmac2);
-
- std::string hmac = hmac1 + hmac2;
- hmac = sha256->hexsum(hmac);
-
- return "HMAC-SHA256:"+ hmac;
- }
- else
- {
- return "AUTH:" + BinToBase64(sha256->hmac(password, challenge));
- }
- }
- else if (!challenge.empty() && !sha256)
- ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"Not authenticating to server using SHA256/HMAC because we don't have m_sha256 loaded!");
+ if (sha256 && !challenge.empty())
+ return "AUTH:" + BinToBase64(sha256->hmac(password, challenge));
+
+ if (!challenge.empty() && !sha256)
+ ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Not authenticating to server using SHA256/HMAC because we don't have an SHA256 provider (e.g. m_sha256) loaded!");