github.com/daeuniverse/quic-go@v0.0.0-20240413031024-943f218e0810/integrationtests/tools/crypto.go (about)

     1  package tools
     2  
     3  import (
     4  	"crypto"
     5  	"crypto/ed25519"
     6  	"crypto/rand"
     7  	"crypto/rsa"
     8  	"crypto/tls"
     9  	"crypto/x509"
    10  	"crypto/x509/pkix"
    11  	"math/big"
    12  	"net"
    13  	"time"
    14  )
    15  
    16  const ALPN = "quic-go integration tests"
    17  
    18  func GenerateCA() (*x509.Certificate, crypto.PrivateKey, error) {
    19  	certTempl := &x509.Certificate{
    20  		SerialNumber:          big.NewInt(2019),
    21  		Subject:               pkix.Name{},
    22  		NotBefore:             time.Now(),
    23  		NotAfter:              time.Now().Add(24 * time.Hour),
    24  		IsCA:                  true,
    25  		ExtKeyUsage:           []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth},
    26  		KeyUsage:              x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign,
    27  		BasicConstraintsValid: true,
    28  	}
    29  	pub, priv, err := ed25519.GenerateKey(rand.Reader)
    30  	if err != nil {
    31  		return nil, nil, err
    32  	}
    33  	caBytes, err := x509.CreateCertificate(rand.Reader, certTempl, certTempl, pub, priv)
    34  	if err != nil {
    35  		return nil, nil, err
    36  	}
    37  	ca, err := x509.ParseCertificate(caBytes)
    38  	if err != nil {
    39  		return nil, nil, err
    40  	}
    41  	return ca, priv, nil
    42  }
    43  
    44  func GenerateLeafCert(ca *x509.Certificate, caPriv crypto.PrivateKey) (*x509.Certificate, crypto.PrivateKey, error) {
    45  	certTempl := &x509.Certificate{
    46  		SerialNumber: big.NewInt(1),
    47  		DNSNames:     []string{"localhost"},
    48  		IPAddresses:  []net.IP{net.IPv4(127, 0, 0, 1)},
    49  		NotBefore:    time.Now(),
    50  		NotAfter:     time.Now().Add(24 * time.Hour),
    51  		ExtKeyUsage:  []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth},
    52  		KeyUsage:     x509.KeyUsageDigitalSignature,
    53  	}
    54  	pub, priv, err := ed25519.GenerateKey(rand.Reader)
    55  	if err != nil {
    56  		return nil, nil, err
    57  	}
    58  	certBytes, err := x509.CreateCertificate(rand.Reader, certTempl, ca, pub, caPriv)
    59  	if err != nil {
    60  		return nil, nil, err
    61  	}
    62  	cert, err := x509.ParseCertificate(certBytes)
    63  	if err != nil {
    64  		return nil, nil, err
    65  	}
    66  	return cert, priv, nil
    67  }
    68  
    69  // GenerateTLSConfigWithLongCertChain generates a tls.Config that uses a long certificate chain.
    70  // The Root CA used is the same as for the config returned from getTLSConfig().
    71  func GenerateTLSConfigWithLongCertChain(ca *x509.Certificate, caPrivateKey crypto.PrivateKey) (*tls.Config, error) {
    72  	const chainLen = 7
    73  	certTempl := &x509.Certificate{
    74  		SerialNumber:          big.NewInt(2019),
    75  		Subject:               pkix.Name{},
    76  		NotBefore:             time.Now(),
    77  		NotAfter:              time.Now().Add(24 * time.Hour),
    78  		IsCA:                  true,
    79  		ExtKeyUsage:           []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth},
    80  		KeyUsage:              x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign,
    81  		BasicConstraintsValid: true,
    82  	}
    83  
    84  	lastCA := ca
    85  	lastCAPrivKey := caPrivateKey
    86  	privKey, err := rsa.GenerateKey(rand.Reader, 2048)
    87  	if err != nil {
    88  		return nil, err
    89  	}
    90  	certs := make([]*x509.Certificate, chainLen)
    91  	for i := 0; i < chainLen; i++ {
    92  		caBytes, err := x509.CreateCertificate(rand.Reader, certTempl, lastCA, &privKey.PublicKey, lastCAPrivKey)
    93  		if err != nil {
    94  			return nil, err
    95  		}
    96  		ca, err := x509.ParseCertificate(caBytes)
    97  		if err != nil {
    98  			return nil, err
    99  		}
   100  		certs[i] = ca
   101  		lastCA = ca
   102  		lastCAPrivKey = privKey
   103  	}
   104  	leafCert, leafPrivateKey, err := GenerateLeafCert(lastCA, lastCAPrivKey)
   105  	if err != nil {
   106  		return nil, err
   107  	}
   108  
   109  	rawCerts := make([][]byte, chainLen+1)
   110  	for i, cert := range certs {
   111  		rawCerts[chainLen-i] = cert.Raw
   112  	}
   113  	rawCerts[0] = leafCert.Raw
   114  
   115  	return &tls.Config{
   116  		Certificates: []tls.Certificate{{
   117  			Certificate: rawCerts,
   118  			PrivateKey:  leafPrivateKey,
   119  		}},
   120  		NextProtos: []string{ALPN},
   121  	}, nil
   122  }