connection, but avoid // panicking. This would perhaps be safer but significantly more // confusing to users. panic("tls13: label or context too long") } hkdfLabel := make([]byte, 0, 2+1+len("tls13 ")+len(label)+1+len(context)) hkdfLabel = byteorder.BEAppendUint16(hkdfLabel, uint16(length)) hkdfLabel = append(hkdfLabel, byte(len("tls13 ")+len(label))) hkdfLabel = append(hkdfLabel, "tls13 "...) hkdfLabel = append(hkdfLabel, label...) hkdfLabel = append(hkdfLabel, byte(len(context))) hkdfLabel = append(hkdfLabel,...