}

	return &rsa.PublicKey{
		E: pub.E,
		N: pub.N,
	}, nil
}

// MarshalPKCS1PublicKey converts an [RSA] public key to PKCS #1, ASN.1 DER form.
//
// This kind of key is commonly encoded in PEM blocks of type "RSA PUBLIC KEY".
func MarshalPKCS1PublicKey(key *rsa.PublicKey) []byte {
	derBytes, _ := asn1.Marshal(pkcs1PublicKey{
		N: key.N,
		E: key.E,
	})
	return derBytes

	}
	err = pem.Encode(privatePem, privateKeyBlock)
	if err != nil {
		fmt.Printf("error when encode private pem: %s n", err)
		os.Exit(1)
	}

	// dump public key to file
	publicKeyBytes := x509.MarshalPKCS1PublicKey(&privatekey.PublicKey)
	if err != nil {
		fmt.Printf("error when dumping publickey: %s n", err)
		os.Exit(1)
	}
	publicKeyBlock := &pem.Block{
		Type:  "PUBLIC KEY",
		Bytes: publicKeyBytes,
	}

pkg crypto/x509, const TooManyConstraints = 8
pkg crypto/x509, const TooManyConstraints InvalidReason
pkg crypto/x509, const UnconstrainedName = 7
pkg crypto/x509, const UnconstrainedName InvalidReason
pkg crypto/x509, func MarshalPKCS1PublicKey(*rsa.PublicKey) []uint8
pkg crypto/x509, func MarshalPKCS8PrivateKey(interface{}) ([]uint8, error)
pkg crypto/x509, func ParsePKCS1PublicKey([]uint8) (*rsa.PublicKey, error)

		E: 3,
	}
	derBytes := MarshalPKCS1PublicKey(pub)
	pub2, err := ParsePKCS1PublicKey(derBytes)
	if err != nil {
		t.Errorf("ParsePKCS1PublicKey: %s", err)
	}
	if pub.N.Cmp(pub2.N) != 0 || pub.E != pub2.E {

		{"KeyUsageKeyEncipherment", Const, 0},
		{"MD2WithRSA", Const, 0},
		{"MD5WithRSA", Const, 0},
		{"MarshalECPrivateKey", Func, 2},
		{"MarshalPKCS1PrivateKey", Func, 0},
		{"MarshalPKCS1PublicKey", Func, 10},
		{"MarshalPKCS8PrivateKey", Func, 10},
		{"MarshalPKIXPublicKey", Func, 0},
		{"NameConstraintsWithoutSANs", Const, 10},
		{"NameMismatch", Const, 8},
		{"NewCertPool", Func, 0},