public static void runTests()
{
string key = "666";
string plainText = "attack at down";
CryptorAES aes = new CryptorAES();
CryptorDES des = new CryptorDES();
string cipherText = aes.Encrypt(plainText, key);
string str = aes.Decrypt(cipherText, key);
Debug.Assert(str == plainText);
cipherText = des.Encrypt(plainText, key);
str = des.Decrypt(cipherText, key);
Debug.Assert(str == plainText);
}
public static string Decrypt(string cipherText, string key, CipherType cipherType, int n)
{
try
{
int amount = n;
string[] textArray = new string[amount];
int chunkSize = cipherText.Length / amount;
int pos = 0;
for (int i = 0; i < amount - 1; ++i)
{
textArray[i] = cipherText.Substring(pos, chunkSize);
pos += chunkSize;
}
textArray[amount - 1] = cipherText.Substring(pos);
string[] resArray = new string[amount];
ICrypto cryptor;
if (cipherType == CipherType.AES)
{
cryptor = new CryptorAES();
}
else
{
cryptor = new CryptorDES();
}
for (int i = 0; i < amount; ++i)
{
resArray[i] = cryptor.Decrypt(textArray[i], key);
}
return(String.Join("", resArray));
}
catch (FormatException)
{
MessageBox.Show("Некорректные входные данные для дешифрования: входная строка не является шифртекстом");
return("");
}
catch (Exception e)
{
MessageBox.Show("Unexpected error: " + e.Message);
return("");
}
}
public static string Encrypt(string plainText, string key, CipherType cipherType, int n)
{
try
{
int amount = n;
string[] textArray = new string[amount];
int chunkSize = plainText.Length / amount;
int pos = 0;
for (int i = 0; i < amount - 1; ++i)
{
textArray[i] = plainText.Substring(pos, chunkSize);
pos += chunkSize;
}
textArray[amount - 1] = plainText.Substring(pos);
string[] resArray = new string[amount];
ICrypto cryptor;
if (cipherType == CipherType.AES)
{
cryptor = new CryptorAES();
}
else
{
cryptor = new CryptorDES();
}
for (int i = 0; i < amount; ++i)
{
resArray[i] = cryptor.Encrypt(textArray[i], key);
}
return(String.Join("", resArray));
}
catch (Exception e)
{
MessageBox.Show("Unexpected error: " + e.Message);
return("");
}
}