Method checkUpdateCryptoKeyLen

srtcore/core.cpp:5206–5250

}

void srt::CUDT::checkUpdateCryptoKeyLen(const char *loghdr SRT_ATR_UNUSED, int32_t typefield)
{
    int enc_flags = SrtHSRequest::SRT_HSTYPE_ENCFLAGS::unwrap(typefield);

    // potentially 0-7 values are possible.
    // When 0, don't change anything - it should rely on the value 0.
    // When 1, 5, 6, 7, this is kinda internal error - ignore.
    if (enc_flags >= 2 && enc_flags <= 4) // 2 = 128, 3 = 192, 4 = 256
    {
        int rcv_pbkeylen = SrtHSRequest::SRT_PBKEYLEN_BITS::wrap(enc_flags);
        if (m_config.iSndCryptoKeyLen == 0)
        {
            m_config.iSndCryptoKeyLen = rcv_pbkeylen;
            HLOGC(cnlog.Debug,
                  log << CONID() << loghdr
                      << ": PBKEYLEN adopted from advertised value: " << m_config.iSndCryptoKeyLen);
        }
        else if (m_config.iSndCryptoKeyLen != rcv_pbkeylen)
        {
            // Conflict. Use SRTO_SENDER flag to check if this side should accept
            // the enforcement, otherwise simply let it win.
            if (!m_config.bDataSender)
            {
                LOGC(cnlog.Warn,
                     log << CONID() << loghdr << ": PBKEYLEN conflict - OVERRIDDEN " << m_config.iSndCryptoKeyLen
                         << " by " << rcv_pbkeylen << " from PEER (as AGENT is not SRTO_SENDER)");
                m_config.iSndCryptoKeyLen = rcv_pbkeylen;
            }
            else
            {
                LOGC(cnlog.Warn,
                     log << CONID() << loghdr << ": PBKEYLEN conflict - keep " << m_config.iSndCryptoKeyLen
                         << "; peer-advertised PBKEYLEN " << rcv_pbkeylen << " rejected because Agent is SRTO_SENDER");
            }
        }
    }
    else if (enc_flags != 0)
    {
        LOGC(cnlog.Error, log << CONID() << loghdr << ": IPE: enc_flags outside allowed 2, 3, 4: " << enc_flags);
    }
    else
    {
        HLOGC(cnlog.Debug, log << CONID() << loghdr << ": No encryption flags found in type field: " << typefield);
    }
}

// Rendezvous
void srt::CUDT::rendezvousSwitchState(UDTRequestType& w_rsptype, bool& w_needs_extension, bool& w_needs_hsrsp)