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package key
import (
crypto_rand "crypto/rand"
"fmt"
"golang.org/x/crypto/nacl/box"
"os"
"git.samanthony.xyz/hose/util"
)
// Generate generates a new public/private keypair. It stores the private key in the
// private key file and the public key in the public key file. If either of the key
// files already exist, they will not be overwritten; instead an error will be returned.
func Generate() error {
util.Logf("generating new keypair...")
// Create public key file.
pubFile, err := createFile(pubKeyFile, pubKeyFileMode)
if err != nil {
return err
}
defer pubFile.Close()
// Create private key file.
privFile, err := createFile(privKeyFile, privKeyFileMode)
if err != nil {
pubFile.Close()
_ = os.Remove(pubKeyFile)
return err
}
defer privFile.Close()
// Generate keypair.
pubkey, privkey, err := box.GenerateKey(crypto_rand.Reader)
if err != nil {
return err
}
// Write keypair to files.
if _, err := pubFile.Write((*pubkey)[:]); err != nil {
return err
}
if _, err := privFile.Write((*privkey)[:]); err != nil {
return err
}
return nil
}
// Generate a keypair if it doesn't already exist.
func generateIfNoExist() error {
pubExists, err := fileExists(pubKeyFile)
if err != nil {
return err
}
privExists, err := fileExists(privKeyFile)
if err != nil {
return err
}
if pubExists && privExists {
// Keypair already exists.
return nil
} else if pubExists && !privExists {
return fmt.Errorf("found public key file but not private key file")
} else if privExists && !pubExists {
return fmt.Errorf("found private key file but not public key file")
}
// Neither public nor private key file exists; generate new keypair.
return Generate()
}
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