code: func GenerateMockPublicPrivateKeyPairPEM(isCA bool) (string, string, error) {
  	privateKey, err := rsa.GenerateKey(rand.Reader, 1024)
  	if err != nil {
  		return "", "", err
  	}
  	privateKeyPEM := string(pem.EncodeToMemory(
  		&pem.Block{
  			Type:  "RSA PRIVATE KEY",
  			Bytes: x509.MarshalPKCS1PrivateKey(privateKey),
  		},
  	))
  
  	template := x509.Certificate{
  		SerialNumber: big.NewInt(100),
  		Subject: pkix.Name{
  			Organization: []string{"Hyperledger Fabric"},
  		},
  	}
  	if isCA {
  		template.IsCA = true
  		template.KeyUsage |= x509.KeyUsageCertSign
  	}
  
  	publicKeyCert, err := x509.CreateCertificate(rand.Reader, &template, &template, privateKey.Public(), privateKey)
  	if err != nil {
  		return "", "", err
  	}
  
  	publicKeyCertPEM := string(pem.EncodeToMemory(
  		&pem.Block{
  			Type:  "CERTIFICATE",
  			Bytes: publicKeyCert,
  		},
  	))
  
  	return publicKeyCertPEM, privateKeyPEM, nil
  }
docs: // GenerateMockPublicPrivateKeyPairPEM returns public/private key pair encoded
  // as PEM strings.