func pkEncode(buf []byte, ρ []byte, t1 [][n]uint16, p parameters) []byte { pk := append(buf, ρ...) for _, w := range t1[:p.k] { // Encode four at a time into 4 * 10 bits = 5 bytes. for i := 0; i < n; i += 4 { c0 := w[i] c1 := w[i+1] c2 := w[i+2] c3 := w[i+3] b0 := byte(c0 >> 0) b1 := byte((c0 >> 8) | (c1 << 2)) b2 := byte((c1 >> 6) | (c2 << 4)) b3 := byte((c2 >> 4) | (c3 << 6)) b4 := byte(c3 >> 2) pk = append(pk, b0, b1, b2, b3, b4) } } return pk } func pkDecode(pk []byte, t1 [][n]uint16, p parameters)...