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key_management.go
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key_management.go
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package main
import (
"encoding/base64"
"log"
"os"
"path/filepath"
"github.com/libp2p/go-libp2p/core/crypto"
"github.com/libp2p/go-libp2p/core/peer"
)
// LoadOrCreateKeys loads existing keys or creates new ones if not present
func LoadOrCreateKeys(privKeyFile string, outputDir string) (crypto.PrivKey, crypto.PubKey, error) {
var priv crypto.PrivKey
var pub crypto.PubKey
var err error
if _, err := os.Stat(privKeyFile); os.IsNotExist(err) {
priv, pub, err = crypto.GenerateKeyPair(crypto.Ed25519, 0)
if err != nil {
return nil, nil, err
}
} else {
privBytes, err := os.ReadFile(privKeyFile)
if err != nil {
return nil, nil, err
}
priv, err = crypto.UnmarshalPrivateKey(privBytes)
if err != nil {
return nil, nil, err
}
pub = priv.GetPublic()
}
privPayload, err := crypto.MarshalPrivateKey(priv)
if err != nil {
log.Fatalf("Could not marshal private key: %s", err)
}
pubPayload, err := crypto.MarshalPublicKey(pub)
if err != nil {
log.Fatalf("Could not marshal public key: %s", err)
}
identity, err := peer.IDFromPublicKey(pub)
if err != nil {
log.Fatalf("Could not generate identity: %s", err)
}
pubKeyFile := filepath.Join(outputDir, pubKeyName)
err = os.WriteFile(pubKeyFile, pubPayload, pubKeyPermissions)
if err != nil {
log.Fatalf("Could not write public key to file: %s", err)
}
pubKeyTextFile := filepath.Join(outputDir, pubKeyTxtName)
pubKeyBase64 := base64.StdEncoding.EncodeToString(pubPayload)
err = os.WriteFile(pubKeyTextFile, []byte(pubKeyBase64), pubKeyPermissions)
if err != nil {
log.Fatalf("Could not write public key text to file: %s", err)
}
identityFile := filepath.Join(outputDir, identityName)
err = os.WriteFile(identityFile, []byte(identity.String()), pubKeyPermissions)
if err != nil {
log.Fatalf("Could not write identity to file: %s", err)
}
privKeyFile = filepath.Join(outputDir, privKeyName)
err = os.WriteFile(privKeyFile, privPayload, privKeyPermissions)
if err != nil {
log.Fatalf("Could not write private key to file: %s", err)
}
// Write peer ID to file
peerIDFile := filepath.Join(outputDir, peerIDFileName)
err = os.WriteFile(peerIDFile, []byte(identity.String()), pubKeyPermissions)
if err != nil {
log.Fatalf("Could not write peer ID to file: %s", err)
}
return priv, pub, nil
}