sign function
Implementation
Uint8List sign(Uint8List msg, Uint8List secretKey, String hashMode) {
checkArrayTypes([msg, secretKey]);
if (secretKey.length != crypto_sign_SECRETKEYBYTES) {
throw Exception('bad secret key size');
}
var signedMsg = Uint8List(crypto_sign_BYTES + msg.length);
crypto_sign(signedMsg, msg, msg.length, secretKey, hashMode);
return signedMsg;
}