source: code/trunk/vendor/github.com/valyala/fasthttp/tls.go@ 145

package fasthttp

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

// GenerateTestCertificate generates a test certificate and private key based on the given host.
func GenerateTestCertificate(host string) ([]byte, []byte, error) {
        priv, err := rsa.GenerateKey(rand.Reader, 2048)
        if err != nil {
                return nil, nil, err
        }

        serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
        serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
        if err != nil {
                return nil, nil, err
        }

        cert := &x509.Certificate{
                SerialNumber: serialNumber,
                Subject: pkix.Name{
                        Organization: []string{"fasthttp test"},
                },
                NotBefore:             time.Now(),
                NotAfter:              time.Now().Add(365 * 24 * time.Hour),
                KeyUsage:              x509.KeyUsageCertSign | x509.KeyUsageDigitalSignature,
                ExtKeyUsage:           []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth, x509.ExtKeyUsageClientAuth},
                SignatureAlgorithm:    x509.SHA256WithRSA,
                DNSNames:              []string{host},
                BasicConstraintsValid: true,
                IsCA:                  true,
        }

        certBytes, err := x509.CreateCertificate(
                rand.Reader, cert, cert, &priv.PublicKey, priv,
        )

        p := pem.EncodeToMemory(
                &pem.Block{
                        Type:  "PRIVATE KEY",
                        Bytes: x509.MarshalPKCS1PrivateKey(priv),
                },
        )

        b := pem.EncodeToMemory(
                &pem.Block{
                        Type:  "CERTIFICATE",
                        Bytes: certBytes,
                },
        )

        return b, p, err
}