diff --git a/utils/cert/cert.go b/utils/cert/cert.go
new file mode 100644
index 00000000..58b23561
--- /dev/null
+++ b/utils/cert/cert.go
@@ -0,0 +1,199 @@
+package cert
+
+import (
+	"bytes"
+	cryptorand "crypto/rand"
+	"crypto/rsa"
+	"crypto/x509"
+	"crypto/x509/pkix"
+	"encoding/pem"
+	"io/ioutil"
+	"math/big"
+	"math/rand"
+	"net"
+	"strconv"
+	"time"
+)
+
+func CreateSignCertToFile(rootCa *x509.Certificate, rootKey *rsa.PrivateKey, domainOrIP string, expireDays int, name string) (err error) {
+	cert, key, err := CreateSignCert(rootCa, rootKey, domainOrIP, expireDays)
+	if err != nil {
+		return
+	}
+	err = ioutil.WriteFile(name+".crt", cert, 0755)
+	if err != nil {
+		return
+	}
+	err = ioutil.WriteFile(name+".key", key, 0755)
+	return
+}
+func CreateSignCert(rootCa *x509.Certificate, rootKey *rsa.PrivateKey, domainOrIP string, expireDays int) (certBytes []byte, keyBytes []byte, err error) {
+	cer := &x509.Certificate{
+		SerialNumber: big.NewInt(rand.Int63()), //证书序列号
+		Subject: pkix.Name{
+			Country:            []string{getCountry()},
+			Organization:       []string{domainOrIP},
+			OrganizationalUnit: []string{domainOrIP},
+			CommonName:         domainOrIP,
+		},
+		NotBefore:             time.Now().Add(-time.Hour),
+		NotAfter:              time.Now().Add(time.Hour * 24 * time.Duration(expireDays)),
+		BasicConstraintsValid: true,
+		IsCA:        false,
+		ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth, x509.ExtKeyUsageClientAuth},
+		//KeyUsage:       x509.KeyUsageDigitalSignature | x509.KeyUsageDataEncipherment,
+		EmailAddresses: []string{},
+		IPAddresses:    []net.IP{},
+	}
+	if ip := net.ParseIP(domainOrIP); ip != nil {
+		cer.IPAddresses = append(cer.IPAddresses, ip)
+	} else {
+		cer.DNSNames = append(cer.DNSNames, domainOrIP)
+	}
+
+	// cer.IPAddresses = append(cer.IPAddresses, alternateIPs...)
+	// cer.DNSNames = append(cer.DNSNames, alternateDNS...)
+
+	//生成公钥私钥对
+	priKey, err := rsa.GenerateKey(cryptorand.Reader, 2048)
+	if err != nil {
+		return
+	}
+	certBytes, err = x509.CreateCertificate(cryptorand.Reader, cer, rootCa, &priKey.PublicKey, rootKey)
+	if err != nil {
+		return
+	}
+
+	//编码证书文件和私钥文件
+	caPem := &pem.Block{
+		Type:  "CERTIFICATE",
+		Bytes: certBytes,
+	}
+	certBytes = pem.EncodeToMemory(caPem)
+
+	buf := x509.MarshalPKCS1PrivateKey(priKey)
+	keyPem := &pem.Block{
+		Type:  "PRIVATE KEY",
+		Bytes: buf,
+	}
+	keyBytes = pem.EncodeToMemory(keyPem)
+	return
+}
+func CreateCaToFile(name, domainOrIP string, expireDays int) (err error) {
+	ca, key, err := CreateCa(domainOrIP, expireDays)
+	if err != nil {
+		return
+	}
+	err = ioutil.WriteFile(name+".crt", ca, 0755)
+	if err != nil {
+		return
+	}
+	err = ioutil.WriteFile(name+".key", key, 0755)
+	return
+}
+func CreateCa(organization string, expireDays int) (certBytes []byte, keyBytes []byte, err error) {
+	priv, err := rsa.GenerateKey(cryptorand.Reader, 2048)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	template := x509.Certificate{
+		SerialNumber: big.NewInt(1),
+		Subject: pkix.Name{
+			CommonName:         organization,
+			Organization:       []string{organization},
+			OrganizationalUnit: []string{organization},
+			Country:            []string{getCountry()},
+		},
+		NotBefore: time.Now().Add(-time.Hour),
+		NotAfter:  time.Now().Add(time.Hour * 24 * time.Duration(expireDays)),
+
+		KeyUsage:              x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign,
+		ExtKeyUsage:           []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
+		BasicConstraintsValid: true,
+		IsCA: true,
+	}
+
+	derBytes, err := x509.CreateCertificate(cryptorand.Reader, &template, &template, &priv.PublicKey, priv)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	// Generate cert
+	certBuffer := bytes.Buffer{}
+	if err := pem.Encode(&certBuffer, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes}); err != nil {
+		return nil, nil, err
+	}
+
+	// Generate key
+	keyBuffer := bytes.Buffer{}
+	if err := pem.Encode(&keyBuffer, &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(priv)}); err != nil {
+		return nil, nil, err
+	}
+
+	return certBuffer.Bytes(), keyBuffer.Bytes(), nil
+}
+func ParseCertAndKeyBytes(certPemFileByes, keyFileBytes []byte) (cert *x509.Certificate, privateKey *rsa.PrivateKey, err error) {
+	//解析根证书
+	cert, err = ParseCertBytes(certPemFileByes)
+	if err != nil {
+		return
+	}
+	//解析私钥
+	privateKey, err = ParseKeyBytes(keyFileBytes)
+	return
+}
+func ParseCertAndKey(certPemFile, keyFile string) (cert *x509.Certificate, privateKey *rsa.PrivateKey, err error) {
+	//解析根证书
+	cert, err = ParseCert(certPemFile)
+	if err != nil {
+		return
+	}
+	//解析私钥
+	privateKey, err = ParseKey(keyFile)
+	return
+}
+func ParseCert(certPemFile string) (cert *x509.Certificate, err error) {
+	//解析证书
+	certFile_, err := ioutil.ReadFile(certPemFile)
+	if err != nil {
+		return
+	}
+	cert, err = ParseCertBytes(certFile_)
+	return
+}
+func ParseKey(keyFile string) (key *rsa.PrivateKey, err error) {
+	//解析证书
+	keyFile_, err := ioutil.ReadFile(keyFile)
+	if err != nil {
+		return
+	}
+	key, err = ParseKeyBytes(keyFile_)
+	return
+}
+func ParseCertBytes(certPemFileBytes []byte) (cert *x509.Certificate, err error) {
+	caBlock, _ := pem.Decode(certPemFileBytes)
+	cert, err = x509.ParseCertificate(caBlock.Bytes)
+	return
+}
+func ParseKeyBytes(keyFileBytes []byte) (praKey *rsa.PrivateKey, err error) {
+	keyBlock, _ := pem.Decode(keyFileBytes)
+	praKey, err = x509.ParsePKCS1PrivateKey(keyBlock.Bytes)
+	return
+}
+func getCountry() string {
+	CList := []string{"AD", "AE", "AF", "AG", "AI", "AL", "AM", "AO", "AR", "AT", "AU", "AZ", "BB", "BD", "BE", "BF", "BG", "BH", "BI", "BJ", "BL", "BM", "BN", "BO", "BR", "BS", "BW", "BY", "BZ", "CA", "CF", "CG", "CH", "CK", "CL", "CM", "CN", "CO", "CR", "CS", "CU", "CY", "CZ", "DE", "DJ", "DK", "DO", "DZ", "EC", "EE", "EG", "ES", "ET", "FI", "FJ", "FR", "GA", "GB", "GD", "GE", "GF", "GH", "GI", "GM", "GN", "GR", "GT", "GU", "GY", "HK", "HN", "HT", "HU", "ID", "IE", "IL", "IN", "IQ", "IR", "IS", "IT", "JM", "JO", "JP", "KE", "KG", "KH", "KP", "KR", "KT", "KW", "KZ", "LA", "LB", "LC", "LI", "LK", "LR", "LS", "LT", "LU", "LV", "LY", "MA", "MC", "MD", "MG", "ML", "MM", "MN", "MO", "MS", "MT", "MU", "MV", "MW", "MX", "MY", "MZ", "NA", "NE", "NG", "NI", "NL", "NO", "NP", "NR", "NZ", "OM", "PA", "PE", "PF", "PG", "PH", "PK", "PL", "PR", "PT", "PY", "QA", "RO", "RU", "SA", "SB", "SC", "SD", "SE", "SG", "SI", "SK", "SL", "SM", "SN", "SO", "SR", "ST", "SV", "SY", "SZ", "TD", "TG", "TH", "TJ", "TM", "TN", "TO", "TR", "TT", "TW", "TZ", "UA", "UG", "US", "UY", "UZ", "VC", "VE", "VN", "YE", "YU", "ZA", "ZM", "ZR", "ZW"}
+	return CList[int(randInt(4))%len(CList)]
+}
+func randInt(strLen int) int64 {
+	codes := "123456789"
+	codeLen := len(codes)
+	data := make([]byte, strLen)
+	rand.Seed(time.Now().UnixNano() + rand.Int63() + rand.Int63() + rand.Int63() + rand.Int63())
+	for i := 0; i < strLen; i++ {
+		idx := rand.Intn(codeLen)
+		data[i] = byte(codes[idx])
+	}
+	i, _ := strconv.ParseInt(string(data), 10, 64)
+	return i
+}
diff --git a/utils/cert/cert_test.go b/utils/cert/cert_test.go
new file mode 100644
index 00000000..a01b4311
--- /dev/null
+++ b/utils/cert/cert_test.go
@@ -0,0 +1,71 @@
+package cert
+
+import (
+	"os"
+	"testing"
+)
+
+func TestCaGen(t *testing.T) {
+	err := CreateCaToFile("ca", "test", 365)
+	if err != nil {
+		t.Fatal(err)
+		return
+	}
+	ca, key, err := ParseCertAndKey("ca.crt", "ca.key")
+	if err != nil {
+		t.Fatal(err)
+		return
+	}
+	if ca.Subject.Organization[0] != "test" {
+		t.Fatalf("Organization %s not match test", ca.Subject.Organization[0])
+		return
+	}
+	err = key.Validate()
+	if err != nil {
+		t.Fatal(err)
+		return
+	}
+	os.Remove("ca.crt")
+	os.Remove("ca.key")
+
+}
+func TestSign(t *testing.T) {
+	err := CreateCaToFile("ca", "test", 365)
+	if err != nil {
+		t.Fatal(err)
+		return
+	}
+	ca, key, err := ParseCertAndKey("ca.crt", "ca.key")
+	if err != nil {
+		t.Fatal(err)
+		return
+	}
+	err = CreateCaToFile("ca", "test", 365)
+	if err != nil {
+		t.Fatal(err)
+		return
+	}
+	err = CreateSignCertToFile(ca, key, "server.com", 365, "server")
+	if err != nil {
+		t.Fatal(err)
+		return
+	}
+	servercrt, serverkey, err := ParseCertAndKey("server.crt", "server.key")
+	if err != nil {
+		t.Fatal(err)
+		return
+	}
+	if servercrt.Subject.CommonName != "server.com" {
+		t.Fatalf("CommonName %s not match server.com", ca.Subject.CommonName)
+		return
+	}
+	err = serverkey.Validate()
+	if err != nil {
+		t.Fatal(err)
+		return
+	}
+	os.Remove("ca.crt")
+	os.Remove("ca.key")
+	os.Remove("server.crt")
+	os.Remove("server.key")
+}