// generateKeys generates a set of keys and saves them to disk.
func generateKeys(requiredKeys int, totalKeys int, folder string, keyname string) (types.UnlockConditions, error) {
// Check that the inputs have sane values.
if requiredKeys < 1 {
return types.UnlockConditions{}, ErrInsecureAddress
}
if totalKeys < requiredKeys {
return types.UnlockConditions{}, ErrUnspendableAddress
}
// Generate 'TotalKeys', filling out everything except the unlock
// conditions.
keys := make([]KeyPair, totalKeys)
pubKeys := make([]crypto.PublicKey, totalKeys)
for i := range keys {
var err error
keys[i].Header = FileHeader
keys[i].Version = FileVersion
keys[i].Index = i
keys[i].SecretKey, pubKeys[i], err = crypto.GenerateSignatureKeys()
if err != nil {
return types.UnlockConditions{}, err
}
}
// Generate the unlock conditions and add them to each KeyPair object. This
// must be done second because the keypairs can't be given unlock
// conditions until the PublicKeys have all been added.
unlockConditions := types.UnlockConditions{
Timelock: 0,
SignaturesRequired: uint64(requiredKeys),
}
for i := range keys {
unlockConditions.PublicKeys = append(unlockConditions.PublicKeys, types.SiaPublicKey{
Algorithm: types.SignatureEd25519,
Key: pubKeys[i][:],
})
}
for i := range keys {
keys[i].UnlockConditions = unlockConditions
}
// Save the KeyPairs to disk.
if folder != "" {
err := os.MkdirAll(folder, 0700)
if err != nil {
return types.UnlockConditions{}, err
}
}
for i, key := range keys {
keyFilename := filepath.Join(folder, keyname+"_Key"+strconv.Itoa(i)+FileExtension)
_, err := os.Stat(keyFilename)
if !os.IsNotExist(err) {
if err != nil {
return types.UnlockConditions{}, err
}
return types.UnlockConditions{}, ErrOverwrite
}
err = encoding.WriteFile(keyFilename, key)
if err != nil {
return types.UnlockConditions{}, err
}
}
return unlockConditions, nil
}
