encrypt method
Implementation
Future<PrivateKey> encrypt(Uint8List keyphrase, Address addr, Uint8List salt,
{ScryptParams params}) async {
var pubkey = await getPublicKey();
var addrExpect = await addr.toBase58();
var addrActual = await (await Address.fromPubkey(pubkey)).toBase58();
if (addrExpect != addrActual)
throw ArgumentError(
'Invalid addr, except: $addrExpect got: $addrActual ');
var enc = await Scrypt.encryptWithGcm(
prikey: raw,
addr58: Convert.strToBytes(addrExpect),
salt: salt,
pwd: keyphrase,
params: params);
return PrivateKey(enc,
algorithm: algorithm, parameters: parameters, scrypt: params);
}