First Commmit

common/tls/mkcert.go

@@ -0,0 +1,65 @@
+package tls
+
+import (
+	"crypto/rand"
+	"crypto/rsa"
+	"crypto/tls"
+	"crypto/x509"
+	"crypto/x509/pkix"
+	"encoding/pem"
+	"math/big"
+	"time"
+)
+
+func GenerateKeyPair(parent *x509.Certificate, parentKey any, timeFunc func() time.Time, serverName string) (*tls.Certificate, error) {
+	if timeFunc == nil {
+		timeFunc = time.Now
+	}
+	privateKeyPem, publicKeyPem, err := GenerateCertificate(parent, parentKey, timeFunc, serverName, timeFunc().Add(time.Hour))
+	if err != nil {
+		return nil, err
+	}
+	certificate, err := tls.X509KeyPair(publicKeyPem, privateKeyPem)
+	if err != nil {
+		return nil, err
+	}
+	return &certificate, err
+}
+
+func GenerateCertificate(parent *x509.Certificate, parentKey any, timeFunc func() time.Time, serverName string, expire time.Time) (privateKeyPem []byte, publicKeyPem []byte, err error) {
+	key, err := rsa.GenerateKey(rand.Reader, 2048)
+	if err != nil {
+		return
+	}
+	serialNumber, err := rand.Int(rand.Reader, new(big.Int).Lsh(big.NewInt(1), 128))
+	if err != nil {
+		return
+	}
+	template := &x509.Certificate{
+		SerialNumber:          serialNumber,
+		NotBefore:             timeFunc().Add(time.Hour * -1),
+		NotAfter:              expire,
+		KeyUsage:              x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
+		ExtKeyUsage:           []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
+		BasicConstraintsValid: true,
+		Subject: pkix.Name{
+			CommonName: serverName,
+		},
+		DNSNames: []string{serverName},
+	}
+	if parent == nil {
+		parent = template
+		parentKey = key
+	}
+	publicDer, err := x509.CreateCertificate(rand.Reader, template, parent, key.Public(), parentKey)
+	if err != nil {
+		return
+	}
+	privateDer, err := x509.MarshalPKCS8PrivateKey(key)
+	if err != nil {
+		return
+	}
+	publicKeyPem = pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: publicDer})
+	privateKeyPem = pem.EncodeToMemory(&pem.Block{Type: "PRIVATE KEY", Bytes: privateDer})
+	return
+}