github.com/bartle-stripe/trillian@v1.2.1/testonly/setup/tls.go (about)

     1  // Copyright 2018 Google Inc. All Rights Reserved.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package setup
    16  
    17  import (
    18  	"crypto/rand"
    19  	"crypto/rsa"
    20  	"crypto/tls"
    21  	"crypto/x509"
    22  	"encoding/pem"
    23  	"math/big"
    24  	"testing"
    25  	"time"
    26  )
    27  
    28  // NewTLSCertificate returns a random TLS Certificate for testing.
    29  func NewTLSCertificate(t *testing.T) tls.Certificate {
    30  	t.Helper()
    31  
    32  	priv, err := rsa.GenerateKey(rand.Reader, 2048)
    33  	if err != nil {
    34  		t.Errorf("failed to generate RSA key: %s", err)
    35  	}
    36  
    37  	privBytes := x509.MarshalPKCS1PrivateKey(priv)
    38  	key := pem.EncodeToMemory(&pem.Block{Type: "PRIVATE KEY", Bytes: privBytes})
    39  
    40  	// Generate public certificate.
    41  	serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
    42  	serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
    43  	if err != nil {
    44  		t.Errorf("failed to generate serial number: %s", err)
    45  	}
    46  
    47  	template := x509.Certificate{
    48  		SerialNumber: serialNumber,
    49  		NotBefore:    time.Time{},
    50  		NotAfter:     time.Now().Add(time.Hour),
    51  		DNSNames:     []string{"localhost"},
    52  	}
    53  	pubBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, &priv.PublicKey, priv)
    54  	if err != nil {
    55  		t.Errorf("failed to generate TLS public certificate: %s", err)
    56  	}
    57  
    58  	crt := pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: pubBytes})
    59  
    60  	c, err := tls.X509KeyPair(crt, key)
    61  	if err != nil {
    62  		t.Errorf("failed to parse the public/private key pair: %s", err)
    63  	}
    64  
    65  	return c
    66  }