/
keyUtils.go
83 lines (70 loc) · 1.71 KB
/
keyUtils.go
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package utils
import (
"crypto/rand"
"fmt"
"io/ioutil"
"github.com/libp2p/go-libp2p-core/crypto"
)
func LoadKey(keyFile string, keyReset bool) crypto.PrivKey {
var prvKey crypto.PrivKey
var err error
if keyReset {
// generate new key
fmt.Println("[KEY UTIL] Generating a new key")
prvKey = SafeKeyGen()
SaveKey(keyFile, prvKey)
return prvKey
}
if keyFile == "" {
fmt.Println("[KEY UTIL] Using a one time key")
prvKey = SafeKeyGen()
return prvKey
}
// load from file
data, err := ioutil.ReadFile(keyFile)
if err != nil {
fmt.Printf("[KEY UTIL] Key could not be read from file '%s' - %s\n", keyFile, err)
prvKey = SafeKeyGen()
SaveKey(keyFile, prvKey)
return prvKey
}
// unpack data
prvKey, err = crypto.UnmarshalPrivateKey(data)
if err != nil {
fmt.Printf("[KEY UTIL] Key could not be decoded - %s\n", err)
prvKey = SafeKeyGen()
SaveKey(keyFile, prvKey)
return prvKey
}
// key was loaded okay, no need to save it
return prvKey
}
func SafeKeyGen() crypto.PrivKey {
r := rand.Reader
prvKey, _, err := crypto.GenerateKeyPairWithReader(crypto.RSA, 2048, r)
if err != nil {
fmt.Printf("[KEY UTIL] Error generating key - %s\n", err)
return nil
}
return prvKey
}
func SaveKey(keyFile string, prvKey crypto.PrivKey) {
// do not save null key
if prvKey == nil {
return
}
fmt.Printf("[KEY UTIL] Saving key to file '%s'\n", keyFile)
// marshal the key
marshaledKey, err := crypto.MarshalPrivateKey(prvKey)
if err != nil {
fmt.Println("[KEY UTIL] Key saving failed:", err)
return
}
// save new key to file
// TODO: change file permissions
err = ioutil.WriteFile(keyFile, marshaledKey, 0777)
if err != nil {
fmt.Println("[KEY UTIL] Key saving failed:", err)
return
}
}