sing-box/common/tls/mkcert.go

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