103 lines
2.6 KiB
Go
103 lines
2.6 KiB
Go
package cmd
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import (
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"crypto/rand"
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"crypto/rsa"
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"crypto/x509"
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"crypto/x509/pkix"
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"encoding/pem"
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"fmt"
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"log"
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"math/big"
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"os"
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"time"
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"github.com/MDrollette/go-i2p/reseed"
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"github.com/codegangsta/cli"
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)
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func NewKeygenCommand() cli.Command {
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return cli.Command{
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Name: "keygen",
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Usage: "Generate keys for reseed SU3 signing",
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Description: "Generate keys for reseed SU3 signing",
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Action: keygenAction,
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Flags: []cli.Flag{
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cli.StringFlag{
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Name: "email",
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Usage: "Your email address (ex. something@mail.i2p)",
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},
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},
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}
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}
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func keygenAction(c *cli.Context) {
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signer := c.String("email")
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if signer == "" {
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log.Fatalln("You must specify an email address (ex. --email=something@mail.i2p)")
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}
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serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
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serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
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if err != nil {
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log.Fatalf("failed to generate serial number: %s", err)
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}
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template := &x509.Certificate{
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BasicConstraintsValid: true,
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IsCA: true,
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SubjectKeyId: []byte(signer),
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SerialNumber: serialNumber,
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Subject: pkix.Name{
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Organization: []string{"I2P Anonymous Network"},
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OrganizationalUnit: []string{"I2P"},
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Locality: []string{"XX"},
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StreetAddress: []string{"XX"},
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Country: []string{"XX"},
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CommonName: signer,
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},
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NotBefore: time.Now(),
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NotAfter: time.Now().AddDate(10, 0, 0),
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ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth},
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KeyUsage: x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign,
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}
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// generate private key
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fmt.Println("Generating keys. This may take a moment...")
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privatekey, err := rsa.GenerateKey(rand.Reader, 4096)
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if err != nil {
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log.Fatalln(err)
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}
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publickey := &privatekey.PublicKey
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// create a self-signed certificate. template = parent
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var parent = template
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cert, err := x509.CreateCertificate(rand.Reader, template, parent, publickey, privatekey)
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if err != nil {
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log.Fatalln(err)
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}
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// save private key
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pemfile, err := os.Create("reseed_private.pem")
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if err != nil {
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log.Fatalf("failed to open reseed_cert.pem for writing: %s", err)
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}
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var pemkey = &pem.Block{
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Type: "RSA PRIVATE KEY",
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Bytes: x509.MarshalPKCS1PrivateKey(privatekey)}
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pem.Encode(pemfile, pemkey)
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pemfile.Close()
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fmt.Println("private key saved to reseed_private.pem")
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// save cert
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filename := reseed.SignerFilename(signer)
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certOut, err := os.Create(filename)
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if err != nil {
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log.Fatalf("failed to open %s for writing: %s", filename, err)
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}
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pem.Encode(certOut, &pem.Block{Type: "CERTIFICATE", Bytes: cert})
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certOut.Close()
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fmt.Println("certificate saved to", filename)
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}
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