PublicKey     asn1.BitString        `asn1:"optional,explicit,tag:1"`
}

// ParseECPrivateKey parses an EC private key in SEC 1, ASN.1 DER form.
//
// This kind of key is commonly encoded in PEM blocks of type "EC PRIVATE KEY".
func ParseECPrivateKey(der []byte) (*ecdsa.PrivateKey, error) {
	return parseECPrivateKey(nil, der)
}

// MarshalECPrivateKey converts an EC private key to SEC 1, ASN.1 DER form.
//

}

func TestParseECPrivateKey(t *testing.T) {
	for i, test := range ecKeyTests {
		derBytes, _ := hex.DecodeString(test.derHex)
		key, err := ParseECPrivateKey(derBytes)
		if err != nil {
			t.Fatalf("#%d: failed to decode EC private key: %s", i, err)
		}
		serialized, err := MarshalECPrivateKey(key)
		if err != nil {

	var privKey pkcs8
	if _, err := asn1.Unmarshal(der, &privKey); err != nil {
		if _, err := asn1.Unmarshal(der, &ecPrivateKey{}); err == nil {
			return nil, errors.New("x509: failed to parse private key (use ParseECPrivateKey instead for this key format)")
		}
		if _, err := asn1.Unmarshal(der, &pkcs1PrivateKey{}); err == nil {
			return nil, errors.New("x509: failed to parse private key (use ParsePKCS1PrivateKey instead for this key format)")

var pkcs8MismatchKeyTests = []struct {
	hexKey        string
	errorContains string
}{
	{hexKey: hexPKCS8TestECKey, errorContains: "use ParseECPrivateKey instead"},
	{hexKey: hexPKCS8TestPKCS1Key, errorContains: "use ParsePKCS1PrivateKey instead"},
}

func TestPKCS8MismatchKeyFormat(t *testing.T) {
	for i, test := range pkcs8MismatchKeyTests {

	kb, _ := pem.Decode(keyBytes)
	if kb == nil {
		return nil, fmt.Errorf("invalid PEM-encoded key")
	}

	switch kb.Type {
	case blockTypeECPrivateKey:
		key, err := x509.ParseECPrivateKey(kb.Bytes)
		if err != nil {
			return nil, fmt.Errorf("failed to parse the ECDSA private key: %v", err)
		}
		return key, nil
	case blockTypeRSAPrivateKey:
		key, err := x509.ParsePKCS1PrivateKey(kb.Bytes)

		return nil, asn1.SyntaxError{Msg: "trailing data"}
	}
	if err != nil {
		if _, err := asn1.Unmarshal(der, &ecPrivateKey{}); err == nil {
			return nil, errors.New("x509: failed to parse private key (use ParseECPrivateKey instead for this key format)")
		}
		if _, err := asn1.Unmarshal(der, &pkcs8{}); err == nil {
			return nil, errors.New("x509: failed to parse private key (use ParsePKCS8PrivateKey instead for this key format)")
		}

		t.Fatalf("failed to parse test root: %s", err)
	}

	der, err = os.ReadFile(rootKeyPath)
	if err != nil {
		t.Fatalf("failed to read test key: %s", err)
	}
	b, _ = pem.Decode(der)
	testRootKey, err := ParseECPrivateKey(b.Bytes)
	if err != nil {
		t.Fatalf("failed to parse test key: %s", err)
	}

	if _, err := testRoot.Verify(VerifyOptions{}); err != nil {
		t.Skipf("test root is not in trust store, skipping (err: %q)", err)
	}