private static void rsaDecrypterText(CryptobyConsole console)
{
scanner = new Scanner(java.lang.System.@in);
// Input encrypted Hex String Text to decrypt
Console.Out.WriteLine("\nYour Text to decrypt (Type '" + quit + "' to Escape):"
);
// Convert crypted HexString Block to one String
try
{
string cryptText = string.Empty;
while (!scanner.hasNext(CryptobyHelper.getEOBString()))
{
if (scanner.hasNext(quit))
{
rsaCrypterText(console);
}
cryptText = cryptText + scanner.next();
}
cryptByte = CryptobyHelper.hexStringToBytes(cryptText);
}
catch (FormatException)
{
// Catch false format of Input
Console.Out.WriteLine("\nNot allowed Crypted Text! Must be a Upper Hex String!"
);
cryptByte = BigInteger.ZERO.toByteArray();
}
// Input the Private Key
privateKeyByte = scanPrivateKey(console);
// Initial RSA Crypt Object
initRSAKeyGen(console);
// Decrypt the String Text with given Key
Console.Out.WriteLine("\nDecryption in progress...");
try
{
plainByte = console.getCore().getCryptAsym().decrypt(cryptByte, privateKeyByte);
}
catch (Exception)
{
Console.Out.WriteLine("\nUnable to decrypt this String!!");
plainByte = null;
// Press Return for Continues
CryptobyHelper.pressEnter();
rsaCrypterText(console);
}
Console.Out.WriteLine("\nDecryption finished...");
// Print decrypted Text
Console.Out.WriteLine("\nRSA-" + keySize + " decrypted Text:");
Console.Out.WriteLine(Encoding.UTF8.GetString(plainByte));
// Reset RSA Crypt Object to release Memory
initRSAKeyGen(console);
// Back to Menu rsaCrypter with Enter (Return) Key
Console.Out.WriteLine("\nGo back to RSA Text Crypter Menu: Press Enter");
CryptobyHelper.pressEnter();
rsaCrypterText(console);
}
private static void aesDecrypterText(CryptobyConsole console)
{
scanner = new Scanner(java.lang.System.@in);
// Input encrypted Hex String Text to decrypt
Console.Out.WriteLine("\nYour Text to decrypt (Type '" + quit + "' to Escape):"
);
// Convert crypted HexString Block to one String
try
{
string cryptText = string.Empty;
while (!scanner.hasNext(CryptobyHelper.getEOBString()))
{
if (scanner.hasNext(quit))
{
aesCrypterText(console);
}
cryptText = cryptText + scanner.next();
}
cryptByte = CryptobyHelper.hexStringToBytes(cryptText);
}
catch (FormatException)
{
// Catch false format of Input
Console.Out.WriteLine("\nNot allowed Crypted Text! Must be a Upper Hex String!"
);
cryptByte = BigInteger.ZERO.toByteArray();
}
// Input your Key for encryption
key = scanKeyText(console);
// Initial AES Crypt Object
initAESKeyGen(console);
// Decrypt the String Text with given Key
Console.Out.WriteLine("\nDecrypting in progress...");
try
{
plainByte = console.getCore().getCryptSym().decrypt(cryptByte, key);
}
catch (Exception)
{
Console.Out.WriteLine("\nUnable to decrypt this String!!");
// Enter for Continues
CryptobyHelper.pressEnter();
aesCrypterText(console);
}
// Print decrypted Text
Console.Out.WriteLine("\nDecryption finished...");
Console.Out.WriteLine("\nAES-" + keySize + " decrypted Text:");
Console.Out.WriteLine(Encoding.UTF8.GetString(plainByte));
// Back to Text Crypter Menu
Console.Out.WriteLine("\nGo back to AES Text Crypter Menu: Press Enter");
CryptobyHelper.pressEnter();
aesCrypterText(console);
}
// Help Functions
private static byte[] scanPrivateKey(CryptobyConsole console)
{
byte[] retKey = null;
do
{
scanner = new Scanner(java.lang.System.@in);
string keyText = string.Empty;
// Input Private Key for decryption
Console.Out.WriteLine("\nEnter the private Key (Type '" + quit + "' to Escape):"
);
try
{
while (!scanner.hasNext(CryptobyHelper.getEOBString()))
{
if (scanner.hasNext(quit))
{
rsaCrypterText(console);
}
keyText = keyText + scanner.next();
}
retKey = CryptobyHelper.hexStringToBytes(keyText);
keySize = retKey.Length * 4;
}
catch (FormatException)
{
// Catch false format of Input
Console.Out.WriteLine("Not allowed Characters in Private Key! Just lower alphanumeric Characters!"
);
retKey = BigInteger.ZERO.toByteArray();
keySize = 0;
}
catch (ArgumentNullException)
{
Console.Out.WriteLine("NullPointerException catched! Try again!");
retKey = BigInteger.ZERO.toByteArray();
keySize = 0;
}
}while (keySize != 1024 && keySize != 2048 && keySize != 4096);
return(retKey);
}
public virtual void testGetEOBString()
{
System.Console.Out.WriteLine("getEOBString");
string expResult = string.Empty;
string result = CryptobyHelper.getEOBString();
}
