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package secp256k1
import (
"bytes"
"math/big"
"testing"
)
func TestGeneratePrivateKey(t *testing.T) {
priv, err := GeneratePrivateKey()
if err != nil {
t.Fatalf("failed to generate key: %v", err)
}
// Should be in valid range [1, N-1]
if priv.D.Sign() <= 0 {
t.Error("private key should be positive")
}
if priv.D.Cmp(N) >= 0 {
t.Error("private key should be less than N")
}
}
func TestGeneratePrivateKeyUnique(t *testing.T) {
// Generate two keys, they should be different
priv1, _ := GeneratePrivateKey()
priv2, _ := GeneratePrivateKey()
if priv1.D.Cmp(priv2.D) == 0 {
t.Error("two generated keys should not be identical")
}
}
func TestPrivateKeyFromBytes(t *testing.T) {
// 32 bytes of 0x01
b := make([]byte, 32)
b[31] = 0x01 // value = 1
priv, err := NewPrivateKeyFromBytes(b)
if err != nil {
t.Fatalf("failed to create key: %v", err)
}
if priv.D.Cmp(big.NewInt(1)) != 0 {
t.Errorf("expected D=1, got %s", priv.D.String())
}
}
func TestPrivateKeyFromBytesInvalidLength(t *testing.T) {
b := make([]byte, 31) // wrong length
_, err := NewPrivateKeyFromBytes(b)
if err == nil {
t.Error("should reject non-32-byte input")
}
}
func TestPrivateKeyFromBytesZero(t *testing.T) {
b := make([]byte, 32) // all zeros
_, err := NewPrivateKeyFromBytes(b)
if err == nil {
t.Error("should reject zero private key")
}
}
func TestPrivateKeyFromHex(t *testing.T) {
hex := "0000000000000000000000000000000000000000000000000000000000000001"
priv, err := NewPrivateKeyFromHex(hex)
if err != nil {
t.Fatalf("failed to create key: %v", err)
}
if priv.D.Cmp(big.NewInt(1)) != 0 {
t.Errorf("expected D=1, got %s", priv.D.String())
}
}
func TestPrivateKeyFromHexInvalid(t *testing.T) {
_, err := NewPrivateKeyFromHex("not-hex")
if err == nil {
t.Error("should reject invalid hex")
}
}
func TestPublicKeyDerivation(t *testing.T) {
// Private key = 1, public key should be G
priv, _ := NewPrivateKeyFromHex("0000000000000000000000000000000000000000000000000000000000000001")
pub := priv.PublicKey()
if !pub.Point.Equal(G) {
t.Error("1 * G should equal G")
}
}
func TestPublicKeyDerivation2(t *testing.T) {
// Private key = 2, public key should be 2G
priv, _ := NewPrivateKeyFromHex("0000000000000000000000000000000000000000000000000000000000000002")
pub := priv.PublicKey()
expected := G.Double()
if !pub.Point.Equal(expected) {
t.Error("2 * G should equal 2G")
}
}
func TestPublicKeyOnCurve(t *testing.T) {
priv, _ := GeneratePrivateKey()
pub := priv.PublicKey()
if !pub.Point.IsOnCurve() {
t.Error("derived public key should be on curve")
}
}
func TestPrivateKeyBytes(t *testing.T) {
priv, _ := NewPrivateKeyFromHex("0000000000000000000000000000000000000000000000000000000000000001")
b := priv.Bytes()
if len(b) != 32 {
t.Errorf("expected 32 bytes, got %d", len(b))
}
if b[31] != 0x01 {
t.Errorf("expected last byte to be 0x01, got 0x%02x", b[31])
}
}
func TestPrivateKeyRoundTrip(t *testing.T) {
priv1, _ := GeneratePrivateKey()
b := priv1.Bytes()
priv2, _ := NewPrivateKeyFromBytes(b)
if priv1.D.Cmp(priv2.D) != 0 {
t.Error("private key should survive bytes round-trip")
}
}
func TestPublicKeyBytesUncompressed(t *testing.T) {
priv, _ := NewPrivateKeyFromHex("0000000000000000000000000000000000000000000000000000000000000001")
pub := priv.PublicKey()
b := pub.Bytes()
if len(b) != 65 {
t.Errorf("uncompressed pubkey should be 65 bytes, got %d", len(b))
}
if b[0] != 0x04 {
t.Errorf("uncompressed prefix should be 0x04, got 0x%02x", b[0])
}
}
func TestPublicKeyBytesCompressed(t *testing.T) {
priv, _ := NewPrivateKeyFromHex("0000000000000000000000000000000000000000000000000000000000000001")
pub := priv.PublicKey()
b := pub.BytesCompressed()
if len(b) != 33 {
t.Errorf("compressed pubkey should be 33 bytes, got %d", len(b))
}
// G has odd y, so prefix should be 0x03
if b[0] != 0x02 && b[0] != 0x03 {
t.Errorf("compressed prefix should be 0x02 or 0x03, got 0x%02x", b[0])
}
}
func TestPublicKeyHex(t *testing.T) {
priv, _ := NewPrivateKeyFromHex("0000000000000000000000000000000000000000000000000000000000000001")
pub := priv.PublicKey()
hex := pub.Hex()
if len(hex) != 130 { // 65 bytes * 2
t.Errorf("uncompressed hex should be 130 chars, got %d", len(hex))
}
hexComp := pub.HexCompressed()
if len(hexComp) != 66 { // 33 bytes * 2
t.Errorf("compressed hex should be 66 chars, got %d", len(hexComp))
}
}
func TestPublicKeyEqual(t *testing.T) {
priv1, _ := NewPrivateKeyFromHex("0000000000000000000000000000000000000000000000000000000000000001")
priv2, _ := NewPrivateKeyFromHex("0000000000000000000000000000000000000000000000000000000000000001")
priv3, _ := NewPrivateKeyFromHex("0000000000000000000000000000000000000000000000000000000000000002")
pub1 := priv1.PublicKey()
pub2 := priv2.PublicKey()
pub3 := priv3.PublicKey()
if !pub1.Equal(pub2) {
t.Error("same private key should produce equal public keys")
}
if pub1.Equal(pub3) {
t.Error("different private keys should produce different public keys")
}
}
// Known test vector from Bitcoin wiki
func TestKnownKeyVector(t *testing.T) {
// Private key = 1
priv, _ := NewPrivateKeyFromHex("0000000000000000000000000000000000000000000000000000000000000001")
pub := priv.PublicKey()
// Public key should be G
expectedX := Gx
expectedY := Gy
if pub.Point.x.value.Cmp(expectedX) != 0 {
t.Error("public key x doesn't match G.x")
}
if pub.Point.y.value.Cmp(expectedY) != 0 {
t.Error("public key y doesn't match G.y")
}
// Check compressed format starts with correct x
compressed := pub.BytesCompressed()
xFromCompressed := compressed[1:33]
expectedXBytes := make([]byte, 32)
copy(expectedXBytes[32-len(expectedX.Bytes()):], expectedX.Bytes())
if !bytes.Equal(xFromCompressed, expectedXBytes) {
t.Error("compressed pubkey x doesn't match")
}
}
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