public GenericResult <string> Decrypt(string targetText, string keyText)
{
var genericResult = new GenericResult <string>();
try
{
byte[] targetTextBytes = Convert.FromBase64String(targetText);
byte[] targetKeyBytes = Encoding.ASCII.GetBytes(keyText);
fillEmptyBytes(ref targetKeyBytes);
fillEmptyBytes(ref targetTextBytes);
byte[] targetBlock = new byte[16];
byte[] keyBlock = new byte[16];
Array.Copy(targetTextBytes, 0, targetBlock, 0, 16);
Array.Copy(targetKeyBytes, 0, keyBlock, 0, 16);
var initialKey = new byte[16];
Array.Copy(keyBlock, initialKey, 16);
var allRoundKeyList = getAllRoundKeyList(keyBlock);
addRoundKey(ref targetBlock, allRoundKeyList[9]);
shiftRows(ref targetBlock, Direction.Right);
subsituteBytes(ref targetBlock, Constants.InverseSBox);
for (int roundCounter = 8; roundCounter >= 0; roundCounter--)
{
addRoundKey(ref targetBlock, allRoundKeyList[roundCounter]);
inverseMixColumn(ref targetBlock);
shiftRows(ref targetBlock, Direction.Right);
subsituteBytes(ref targetBlock, Constants.InverseSBox);
}
addRoundKey(ref targetBlock, initialKey);
genericResult.ResultValue = Encoding.ASCII.GetString(targetBlock);
}
catch (Exception ex)
{
genericResult.Errors.Add(ex.ToString());
return(genericResult);
}
return(genericResult);
}
public GenericResult <string> Encrypt(string targetText, string keyText)
{
var genericResult = new GenericResult <string>();
try
{
byte[] targetTextBytes = Encoding.ASCII.GetBytes(targetText);
byte[] targetKeyBytes = Encoding.ASCII.GetBytes(keyText);
fillEmptyBytes(ref targetKeyBytes);
fillEmptyBytes(ref targetTextBytes);
byte[] targetBlock = new byte[16];
byte[] keyBlock = new byte[16];
Array.Copy(targetTextBytes, 0, targetBlock, 0, 16);
Array.Copy(targetKeyBytes, 0, keyBlock, 0, 16);
addRoundKey(ref targetBlock, keyBlock);
for (int roundCounter = 0; roundCounter < 9; roundCounter++)
{
subsituteBytes(ref targetBlock);
shiftRows(ref targetBlock, Direction.Left);
mixColumns(ref targetBlock);
getNextRoundKey(ref keyBlock, roundCounter);
addRoundKey(ref targetBlock, keyBlock);
}
subsituteBytes(ref targetBlock);
shiftRows(ref targetBlock, Direction.Left);
getNextRoundKey(ref keyBlock, 9);
addRoundKey(ref targetBlock, keyBlock);
genericResult.ResultValue = Convert.ToBase64String(targetBlock);
}
catch (Exception ex)
{
genericResult.Errors.Add(ex.ToString());
return(genericResult);
}
return(genericResult);
}
