134 lines
3.2 KiB
Go
134 lines
3.2 KiB
Go
package x509crt
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import (
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"crypto/rand"
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"crypto/rsa"
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"crypto/x509"
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"crypto/x509/pkix"
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"encoding/pem"
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"fmt"
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"math/big"
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"time"
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)
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func CreateX509SelfSignedCert(subject string, hostnames ...string) ([]byte, []byte, error) {
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var err error
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certPem := make([]byte, 0)
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keyPem := make([]byte, 0)
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now := time.Now()
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const yearsAfter int = 10
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const keySize int = 2048
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key, err := rsa.GenerateKey(rand.Reader, keySize)
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if err != nil {
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err := fmt.Errorf("Can't create a private key: %v", err)
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return certPem, keyPem, err
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}
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keyPemBlock := pem.Block{
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Type: "RSA PRIVATE KEY",
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Bytes: x509.MarshalPKCS1PrivateKey(key),
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}
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keyPem = pem.EncodeToMemory(&keyPemBlock)
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certSubject := pkix.Name{
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CommonName: subject,
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}
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certIssuer := certSubject
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dnsNames := make([]string, 0)
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dnsNames = append(dnsNames, subject)
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dnsNames = append(dnsNames, hostnames...)
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tml := x509.Certificate{
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SerialNumber: big.NewInt(now.Unix()),
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NotBefore: now,
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NotAfter: now.AddDate(yearsAfter, 0, 0),
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Subject: certSubject,
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Issuer: certIssuer,
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DNSNames: dnsNames,
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BasicConstraintsValid: true,
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ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth},
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KeyUsage: x509.KeyUsageDigitalSignature |
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x509.KeyUsageContentCommitment |
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x509.KeyUsageKeyEncipherment |
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x509.KeyUsageDataEncipherment,
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}
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certBytes, err := x509.CreateCertificate(rand.Reader, &tml, &tml, &key.PublicKey, key)
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if err != nil {
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return certPem, keyPem, fmt.Errorf("Can't create a certificate: %v", err)
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}
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certPemBlock := pem.Block{
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Type: "CERTIFICATE",
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Bytes: certBytes,
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}
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certPem = pem.EncodeToMemory(&certPemBlock)
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if err != nil {
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return certPem, keyPem, err
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}
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return certPem, keyPem, err
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}
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func CreateX509CACert(commonName string) ([]byte, []byte, error) {
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var err error
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certPem := make([]byte, 0)
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keyPem := make([]byte, 0)
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now := time.Now()
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const yearsAfter int = 10
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const keySize int = 2048
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key, err := rsa.GenerateKey(rand.Reader, keySize)
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if err != nil {
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err := fmt.Errorf("Can't create a private key: %v", err)
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return certPem, keyPem, err
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}
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keyPemBlock := pem.Block{
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Type: "RSA PRIVATE KEY",
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Bytes: x509.MarshalPKCS1PrivateKey(key),
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}
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keyPem = pem.EncodeToMemory(&keyPemBlock)
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certSubject := pkix.Name{
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CommonName: commonName,
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}
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certIssuer := certSubject
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tml := x509.Certificate{
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SerialNumber: big.NewInt(now.Unix()),
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NotBefore: now,
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NotAfter: now.AddDate(yearsAfter, 0, 0),
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Subject: certSubject,
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Issuer: certIssuer,
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IsCA: true,
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ExtKeyUsage: []x509.ExtKeyUsage{
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x509.ExtKeyUsageClientAuth,
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x509.ExtKeyUsageServerAuth},
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KeyUsage: x509.KeyUsageDigitalSignature |
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x509.KeyUsageCertSign |
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x509.KeyUsageKeyEncipherment |
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x509.KeyUsageCRLSign,
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BasicConstraintsValid: true,
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}
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certBytes, err := x509.CreateCertificate(rand.Reader, &tml, &tml, &key.PublicKey, key)
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if err != nil {
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return certPem, keyPem, fmt.Errorf("Can't create a certificate: %v", err)
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}
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certPemBlock := pem.Block{
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Type: "CERTIFICATE",
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Bytes: certBytes,
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}
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certPem = pem.EncodeToMemory(&certPemBlock)
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if err != nil {
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return certPem, keyPem, err
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}
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return certPem, keyPem, err
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}
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