63 lines
1.7 KiB
Go
63 lines
1.7 KiB
Go
package certgen
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import (
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"crypto/rand"
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"crypto/rsa"
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"crypto/tls"
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"crypto/x509"
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"crypto/x509/pkix"
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"fmt"
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"math/big"
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"time"
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)
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// MakeCaTls generates a CA TLS certificate
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func MakeCaTls(bits int, name pkix.Name, serialNumber *big.Int, future Future) (*CertGen, error) {
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// base certificate data
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now := time.Now()
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ca := &x509.Certificate{
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SerialNumber: serialNumber,
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Subject: name,
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NotBefore: now,
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NotAfter: future(now),
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IsCA: true,
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ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth},
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KeyUsage: x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign,
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BasicConstraintsValid: true,
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}
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// generate rsa private key
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caPrivKey, err := rsa.GenerateKey(rand.Reader, bits)
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if err != nil {
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return nil, fmt.Errorf("Failed to generate CA private key: %w", err)
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}
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// create certificate bytes
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caBytes, err := x509.CreateCertificate(rand.Reader, ca, ca, caPrivKey.Public(), caPrivKey)
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if err != nil {
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return nil, fmt.Errorf("Failed to generate CA certificate bytes: %w", err)
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}
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// add the raw certificate bytes so `*x509.Certificate.Equal(*x509.Certificate)` is valid
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ca.Raw = caBytes
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// get private key bytes
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privKeyBytes := x509.MarshalPKCS1PrivateKey(caPrivKey)
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gen := &CertGen{cert: ca, certBytes: caBytes, key: caPrivKey, keyBytes: privKeyBytes}
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// generate pem blocks
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err = gen.generatePem()
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if err != nil {
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return nil, fmt.Errorf("Failed to generate PEM encoding: %w", err)
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}
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// generate key pair
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caKeyPair, err := tls.X509KeyPair(gen.certPem, gen.keyPem)
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if err != nil {
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return nil, fmt.Errorf("Failed to generate CA key pair: %w", err)
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}
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gen.tlsCert = caKeyPair
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return gen, nil
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}
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