tls_test.go

// SPDX-License-Identifier: Apache-2.0

package nbd

import (
	"crypto"
	"crypto/rand"
	"crypto/rsa"
	"crypto/x509"
	"crypto/x509/pkix"
	"fmt"
	"math/big"
	"time"
)

func newTestCACertAndKey() ([]byte, *rsa.PrivateKey, error) {
	key, err := rsa.GenerateKey(rand.Reader, 4096)
	if err != nil {
		return nil, nil, fmt.Errorf("generate CA private key: %w", err)
	}

	notBefore := time.Now()
	notAfter := notBefore.Add(time.Hour)

	usage := x509.KeyUsageDigitalSignature |
		x509.KeyUsageKeyAgreement |
		x509.KeyUsageKeyEncipherment |
		x509.KeyUsageDataEncipherment

	template := x509.Certificate{
		SerialNumber:          big.NewInt(0),
		Subject:               pkix.Name{CommonName: "localhost"},
		SignatureAlgorithm:    x509.SHA256WithRSA,
		NotBefore:             notBefore,
		NotAfter:              notAfter,
		BasicConstraintsValid: true,
		KeyUsage:              usage,
		ExtKeyUsage: []x509.ExtKeyUsage{
			x509.ExtKeyUsageServerAuth,
			x509.ExtKeyUsageClientAuth,
		},
	}

	caBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, &key.PublicKey, key)
	if err != nil {
		return nil, nil, fmt.Errorf("create CA cert: %w", err)
	}

	return caBytes, key, nil
}

func newServerCertAndKey(caCert *x509.Certificate, caKey crypto.Signer) ([]byte, *rsa.PrivateKey, error) {
	key, err := rsa.GenerateKey(rand.Reader, 4096)
	if err != nil {
		return nil, nil, fmt.Errorf("generate server private key: %w", err)
	}

	notBefore := time.Now()
	notAfter := notBefore.Add(time.Hour)

	usage := x509.KeyUsageDigitalSignature |
		x509.KeyUsageKeyAgreement |
		x509.KeyUsageKeyEncipherment |
		x509.KeyUsageDataEncipherment

	template := x509.Certificate{
		SerialNumber:          big.NewInt(0),
		Subject:               pkix.Name{CommonName: "localhost"},
		SignatureAlgorithm:    x509.SHA256WithRSA,
		NotBefore:             notBefore,
		NotAfter:              notAfter,
		BasicConstraintsValid: true,
		KeyUsage:              usage,
		ExtKeyUsage: []x509.ExtKeyUsage{
			x509.ExtKeyUsageServerAuth,
			x509.ExtKeyUsageClientAuth,
		},
	}

	serverBytes, err := x509.CreateCertificate(rand.Reader, &template, caCert, &key.PublicKey, caKey)
	if err != nil {
		return nil, nil, fmt.Errorf("create server cert: %w", err)
	}

	return serverBytes, key, nil
}