const crypto/tls.clientSignatureContext

3 uses

	crypto/tls (current package)
		auth.go#L65: 	clientSignatureContext = "TLS 1.3, client CertificateVerify\x00"
		handshake_client_tls13.go#L592: 	signed := signedMessage(sigHash, clientSignatureContext, hs.transcript)
		handshake_server_tls13.go#L817: 		signed := signedMessage(sigHash, clientSignatureContext, hs.transcript)