Function illegalClientHelloChange

handshake_server_tls13.go:459–512

illegalClientHelloChange reports whether the two ClientHello messages are different, with the exception of the changes allowed before and after a HelloRetryRequest. See RFC 8446, Section 4.1.2.

(ch, ch1 *clientHelloMsg)

// different, with the exception of the changes allowed before and after a
// HelloRetryRequest. See RFC 8446, Section 4.1.2.
func illegalClientHelloChange(ch, ch1 *clientHelloMsg) bool {
	if len(ch.supportedVersions) != len(ch1.supportedVersions) ||
		len(ch.cipherSuites) != len(ch1.cipherSuites) ||
		len(ch.supportedCurves) != len(ch1.supportedCurves) ||
		len(ch.supportedSignatureAlgorithms) != len(ch1.supportedSignatureAlgorithms) ||
		len(ch.supportedSignatureAlgorithmsCert) != len(ch1.supportedSignatureAlgorithmsCert) ||
		len(ch.alpnProtocols) != len(ch1.alpnProtocols) {
		return true
	}
	for i := range ch.supportedVersions {
		if ch.supportedVersions[i] != ch1.supportedVersions[i] {
			return true
		}
	}
	for i := range ch.cipherSuites {
		if ch.cipherSuites[i] != ch1.cipherSuites[i] {
			return true
		}
	}
	for i := range ch.supportedCurves {
		if ch.supportedCurves[i] != ch1.supportedCurves[i] {
			return true
		}
	}
	for i := range ch.supportedSignatureAlgorithms {
		if ch.supportedSignatureAlgorithms[i] != ch1.supportedSignatureAlgorithms[i] {
			return true
		}
	}
	for i := range ch.supportedSignatureAlgorithmsCert {
		if ch.supportedSignatureAlgorithmsCert[i] != ch1.supportedSignatureAlgorithmsCert[i] {
			return true
		}
	}
	for i := range ch.alpnProtocols {
		if ch.alpnProtocols[i] != ch1.alpnProtocols[i] {
			return true
		}
	}
	return ch.vers != ch1.vers ||
		!bytes.Equal(ch.random, ch1.random) ||
		!bytes.Equal(ch.sessionId, ch1.sessionId) ||
		!bytes.Equal(ch.compressionMethods, ch1.compressionMethods) ||
		ch.serverName != ch1.serverName ||
		ch.ocspStapling != ch1.ocspStapling ||
		!bytes.Equal(ch.supportedPoints, ch1.supportedPoints) ||
		ch.ticketSupported != ch1.ticketSupported ||
		!bytes.Equal(ch.sessionTicket, ch1.sessionTicket) ||
		ch.secureRenegotiationSupported != ch1.secureRenegotiationSupported ||
		!bytes.Equal(ch.secureRenegotiation, ch1.secureRenegotiation) ||
		ch.scts != ch1.scts ||
		!bytes.Equal(ch.cookie, ch1.cookie) ||
		!bytes.Equal(ch.pskModes, ch1.pskModes)
}

func (hs *serverHandshakeStateTLS13) sendServerParameters() error {
	c := hs.c