86 lines
2.1 KiB
Go
86 lines
2.1 KiB
Go
package acme
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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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"math/big"
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"time"
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)
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type derCertificateBytes []byte
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func generatePrivateKey(keyLength int) (*rsa.PrivateKey, error) {
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return rsa.GenerateKey(rand.Reader, keyLength)
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}
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func generateCsr(privateKey *rsa.PrivateKey, domain string) ([]byte, error) {
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template := x509.CertificateRequest{
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Subject: pkix.Name{
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CommonName: domain,
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},
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}
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return x509.CreateCertificateRequest(rand.Reader, &template, privateKey)
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}
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func pemEncode(data interface{}) []byte {
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var pemBlock *pem.Block
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switch key := data.(type) {
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case *rsa.PrivateKey:
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pemBlock = &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(key)}
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break
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case derCertificateBytes:
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pemBlock = &pem.Block{Type: "CERTIFICATE", Bytes: []byte(data.(derCertificateBytes))}
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}
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return pem.EncodeToMemory(pemBlock)
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}
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// GetCertExpiration returns the "NotAfter" date of a DER encoded certificate.
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func GetCertExpiration(cert []byte) (time.Time, error) {
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pCert, err := x509.ParseCertificate(cert)
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if err != nil {
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return time.Time{}, err
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}
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return pCert.NotAfter, nil
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}
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func generatePemCert(privKey *rsa.PrivateKey, domain string) ([]byte, error) {
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derBytes, err := generateDerCert(privKey, time.Time{}, domain)
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if err != nil {
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return nil, err
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}
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return pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: derBytes}), nil
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}
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func generateDerCert(privKey *rsa.PrivateKey, expiration time.Time, domain string) ([]byte, error) {
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serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
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serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
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if err != nil {
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return nil, err
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}
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if expiration.IsZero() {
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expiration = time.Now().Add(365)
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}
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template := x509.Certificate{
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SerialNumber: serialNumber,
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Subject: pkix.Name{
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CommonName: "ACME Challenge TEMP",
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},
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NotBefore: time.Now(),
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NotAfter: expiration,
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KeyUsage: x509.KeyUsageKeyEncipherment,
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BasicConstraintsValid: true,
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DNSNames: []string{domain},
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}
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return x509.CreateCertificate(rand.Reader, &template, &template, &privKey.PublicKey, privKey)
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}
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