convert this function c# encryption and decryption to Dart/Flutter? - flutter

Question

welcome everybody
I moved from xamarin to Flutter
I encountered some problems
Including encryption and decryption
How can I convert this function to Dart/Flutter?
This function is required to communicate with the api
Thank you everyone
public static string encryp(string x, string encrypt)//function
{
try
{
string y = x;
byte[] etext = UTF8Encoding.UTF8.GetBytes(y);
string Code = encrypt;
MD5CryptoServiceProvider mdhash = new MD5CryptoServiceProvider();
byte[] keyarray = mdhash.ComputeHash(UTF8Encoding.UTF8.GetBytes(Code));
TripleDESCryptoServiceProvider tds = new TripleDESCryptoServiceProvider();
tds.Key = keyarray;
tds.Mode = CipherMode.ECB;
tds.Padding = PaddingMode.PKCS7;
ICryptoTransform itransform = tds.CreateEncryptor();
byte[] result = itransform.TransformFinalBlock(etext, 0, etext.Length);
string encryptresult = Convert.ToBase64String(result);
return encryptresult.ToString();
}
catch (Exception ex)
{
return (ex.Message==null ?"": ex.Message);
}
}
public static string decrypt(string x, string keyai)
{
try
{
string y = x.Replace("\0", null);
byte[] etext = Convert.FromBase64String(y);
string key = keyai;
MD5CryptoServiceProvider mdhash = new MD5CryptoServiceProvider();
byte[] keyarray = mdhash.ComputeHash(UTF8Encoding.UTF8.GetBytes(key));
TripleDESCryptoServiceProvider tds = new TripleDESCryptoServiceProvider();
tds.Key = keyarray;
tds.Mode = CipherMode.ECB;
tds.Padding = PaddingMode.PKCS7;
ICryptoTransform itransform = tds.CreateDecryptor();
byte[] result = itransform.TransformFinalBlock(etext, 0, etext.Length);
string dencryptresult = UTF8Encoding.UTF8.GetString(result);
return dencryptresult.ToString();
}
catch (Exception ex)
{
return (ex.Message==null ?"": ex.Message);
}
}
update
I wrote this code on Flutter
import 'package:dart_des/dart_des.dart' as des3;
String encryptDataE(String _plainText, String _key) {
var bytes = new List<int>.from(utf8.encode(_plainText));
var key = md5.convert(utf8.encode(_key)).bytes; //The key is any letters
des3.DES3 mDes3CBC = des3.DES3(
key: key,
mode: des3.DESMode.ECB,
paddingType: des3.DESPaddingType.PKCS7,
);
final encrypted = mDes3CBC.encrypt(bytes);
String value = base64Encode(encrypted);
return value;
}
String decryptDataD(String _plainText, String _key) {
String plainText = _plainText.replaceAll("\0", null);
var bytes = base64.decode(plainText);
var key = md5.convert(utf8.encode(_key)).bytes; //The key is any letters
des3.DES3 mDes3CBC = des3.DES3(
key: key,
mode: des3.DESMode.ECB,
paddingType: des3.DESPaddingType.PKCS7,
);
final decrypt= mDes3CBC.decrypt(bytes);
String value = utf8.decode(decrypt);
return value;
}
After experimenting with encryption and decoding, this works now
One point left, how can this be achieved?
//string y = x.Replace("\0", null);//c#
String plainText = _plainText.replaceAll("\0", null); //I tried with this and it gets an error

Answer 1

Consider using this tool: "Use the tool e.g. for porting your Xamarin/UWP project to Flutter"
Otherwise, there is a pretty easy Flutter Encrypt package here
//Package example
import 'package:encrypt/encrypt.dart';
void main() {
final plainText = 'Lorem ipsum dolor sit amet, consectetur adipiscing elit';
final key = Key.fromUtf8('my 32 length key................');
final iv = IV.fromLength(16);
final encrypter = Encrypter(AES(key));
final encrypted = encrypter.encrypt(plainText, iv: iv);
final decrypted = encrypter.decrypt(encrypted, iv: iv);
print(decrypted); // Lorem ipsum dolor sit amet, consectetur adipiscing elit
print(encrypted.base64); // R4PxiU3h8YoIRqVowBXm36ZcCeNeZ4s1OvVBTfFlZRdmohQqOpPQqD1YecJeZMAop/hZ4OxqgC1WtwvX/hP9mw==
}