public override string Encrypt(string plainText, string key)
{
byte[,] keyBytes = new byte[4, 4];
byte[,] PlainBytes = new byte[4, 4];
if (key[0] == '0' && key[1] == 'x')
{
for (int i = 0; i < 4 * 4; i++) //copying Keystring to my byte array
{
string temp = key[i + (i + 2)] + "" + key[i + (i + 3)];
keyBytes[i % 4, i / 4] = Convert.ToByte(temp, 16);
}
}
if (plainText[0] == '0' && plainText[1] == 'x')
{
for (int i = 0; i < 4 * 4; i++) //copying PTstring to my byte array
{
string temp = plainText[i + (i + 2)] + "" + plainText[i + (i + 3)];
PlainBytes[i % 4, i / 4] = Convert.ToByte(temp, 16);
}
}
AES_Os my_aes = new AES_Os(keyBytes, AES_Os.KeySize.Bits128);
PlainBytes = my_aes.Encrypt(PlainBytes);
string encrypted_message = "0x";
for (int i = 0; i < 4 * 4; i++)
{
encrypted_message += PlainBytes[i % 4, i / 4].ToString("X2");
}
return(encrypted_message);
}
public override string Decrypt(string cipherText, string key)
{
byte[,] keyBytes = new byte[4, 4];
byte[,] CipherBytes = new byte[4, 4];
if (key[0] == '0' && key[1] == 'x')
{
for (int i = 0; i < 4 * 4; i++) //copying Keystring to my byte array
{
string temp = key[i + (i + 2)] + "" + key[i + (i + 3)];
keyBytes[i % 4, i / 4] = Convert.ToByte(temp, 16);
}
}
if (cipherText[0] == '0' && cipherText[1] == 'x')
{
for (int i = 0; i < 4 * 4; i++) //copying PTstring to my byte array
{
string temp = cipherText[i + (i + 2)] + "" + cipherText[i + (i + 3)];
CipherBytes[i % 4, i / 4] = Convert.ToByte(temp, 16);
}
}
AES_Os my_aes = new AES_Os(keyBytes, AES_Os.KeySize.Bits128);
CipherBytes = my_aes.Decrypt(CipherBytes);
string Decrypted_Message = "0x";
for (int i = 0; i < 4 * 4; i++)
{
Decrypted_Message += CipherBytes[i % 4, i / 4].ToString("X2");
}
return(Decrypted_Message);
}
