package filter

import (
	"encoding/hex"
	"testing"
)

// Official SipHash-2-4 test vectors from the reference implementation. The key
// is 000102...0f and the messages are the first 0, 1, 8, and 15 bytes of
// 000102...0e.
func TestSipHash24Vectors(t *testing.T) {
	keyBytes, err := hex.DecodeString("000102030405060708090a0b0c0d0e0f")
	if err != nil {
		t.Fatal(err)
	}
	var key [16]byte
	copy(key[:], keyBytes)

	tests := []struct {
		msg  int
		want uint64
	}{
		{0, 0x726fdb47dd0e0e31},
		{1, 0x74f839c593dc67fd},
		{8, 0x93f5f5799a932462},
		{15, 0xa129ca6149be45e5},
	}
	for _, tc := range tests {
		msg := make([]byte, tc.msg)
		for i := range msg {
			msg[i] = byte(i)
		}
		if got := siphash24(key, msg); got != tc.want {
			t.Errorf("siphash24(%d-byte msg) = %#016x, want %#016x", tc.msg, got, tc.want)
		}
	}
}