Simple encryption and decryption

 

Public class keytool {

Private Static int [] src = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };

Private Static int [] des = {9, 6, 8, 2, 3, 5, 1, 4, 0, 7 };

Public static string encrypt (string originalnum ){

Char [] digitnum = originalnum. tochararray ();
Int length = digitnum. length;
String mapnum = "";
For (INT I = 0; I <length; I ++ ){
Int Index = integer. parseint (string. valueof (digitnum [I]);
Mapnum + = string. valueof (des [Index]);
}
Return mapnum;
}

Public static string dencrypt (string originalnum ){

Char [] digitnum = originalnum. tochararray ();
Int length = digitnum. length;
String mapnum = "";
String decryptstr = "9682351407 ";
For (INT I = 0; I <length; I ++ ){
Int Index = decryptstr. indexof (string. valueof (digitnum [I]);
Mapnum + = string. valueof (SRC [Index]);
}
Return mapnum;
}

}