public static AesEncyrption getInstance()
{
if (instance == null)
{
try
{
if (string.IsNullOrEmpty(_encryptionKey))
{
Initalize();
}
AesEncyrption bcEngine = new AesEncyrption();
KeyParameter keyParam = new KeyParameter(Encoding.UTF8.GetBytes(_encryptionKey));
ICipherParameters param = new ParametersWithIV(keyParam, iv);
//create decrypt/encryptor cipher
IBlockCipherPadding padding = new Pkcs7Padding();
BufferedBlockCipher decrypt = new PaddedBufferedBlockCipher(new CbcBlockCipher(new AesEngine()), padding);
decrypt.Reset();
decrypt.Init(false, param);
bcEngine.setDecryptCipher(decrypt);
BufferedBlockCipher encrypt = new PaddedBufferedBlockCipher(new CbcBlockCipher(new AesEngine()), padding);
encrypt.Reset();
encrypt.Init(true, param);
bcEngine.setEncryptCipher(encrypt);
instance = bcEngine;
}
catch (Exception)
{
throw;
}
}
return instance;
}
private static void en_de_crypt(en_de_cryption_mode en_de_cryption_mode_current,
string file_path_from,
string file_path_to,
bool delete_file_path_from,
bool interactive)
{
Form form = new Form();
Label password_1_label = new Label(),
password_2_label = new Label();
int label_width = 150,
label_height = 20,
textbox_width = 200,
textbox_height = 20,
button_width = 80,
button_height = 40;
Color label_forecolor = Color.LightGreen,
password_backcolor = Color.Black,
password_forecolor = Color.LightGreen,
proceed_backcolor = Color.Black,
proceed_forecolor = Color.LightGreen,
cancel_backcolor = Color.Black,
cancel_forecolor = Color.LightGreen,
error_forecolor = Color.Red;
ContentAlignment label_text_alignment = ContentAlignment.MiddleRight,
button_text_alignment = ContentAlignment.MiddleCenter;
TextBox password_1 = new TextBox(),
password_2 = new TextBox();
char password_character = '*';
BorderStyle password_border_style = BorderStyle.Fixed3D;
Font label_font = new Font(FontFamily.GenericMonospace, (float)10.0),
password_font = new Font(FontFamily.GenericMonospace, (float)10.0),
button_font = new Font(FontFamily.GenericMonospace, (float)10.0);
Button proceed = new Button(),
cancel = new Button();
form.StartPosition = FormStartPosition.CenterParent;
form.Width = 400;
form.Height = 180;
form.BackColor = Color.Black;
form.Text = "Please, provide the password for the " +
(en_de_cryption_mode_current == en_de_cryption_mode.encrypt ?
"encryption" : "decryption") +
".";
password_1_label.Bounds = new Rectangle(10, 20, label_width, label_height);
password_1_label.Font = label_font;
password_1_label.ForeColor = label_forecolor;
password_1_label.TextAlign = label_text_alignment;
password_1_label.Text = "Password:"******"Confirm password:"******"OnClick",
BindingFlags.Instance |
BindingFlags.NonPublic)
.Invoke(cancel, new object[] { null });
if (en_de_cryption_mode_current == en_de_cryption_mode.encrypt) {
if (!string.IsNullOrEmpty(password_1.Text)) {
password_2.Enabled = true;
} else {
proceed.Enabled = false;
password_2.Text = "";
if (password_2.Enabled)
password_2.Enabled = false;
}
} else {
if (!string.IsNullOrEmpty(password_1.Text))
proceed.Enabled = true;
else
proceed.Enabled = false;
}
if ((Keys)e.KeyValue == Keys.Enter &&
!string.IsNullOrEmpty(password_1.Text)) {
if (en_de_cryption_mode_current == en_de_cryption_mode.encrypt)
password_2.Focus();
else
proceed.GetType()
.GetMethod("OnClick",
BindingFlags.Instance |
BindingFlags.NonPublic)
.Invoke(proceed,
new object[] { new KeyEventArgs(Keys.Enter) });
}
};
password_2.Bounds = new Rectangle(160, 50, textbox_width, textbox_height);
password_2.BackColor = password_backcolor;
password_2.ForeColor = password_forecolor;
password_2.BorderStyle = password_border_style;
password_2.PasswordChar = password_character;
password_2.Font = password_font;
password_2.Multiline = false;
password_2.Enabled = false;
if (en_de_cryption_mode_current == en_de_cryption_mode.encrypt)
password_2.KeyUp += (sender, e) =>
{
if ((Keys)e.KeyValue == Keys.Escape)
cancel.GetType()
.GetMethod("OnClick",
BindingFlags.Instance |
BindingFlags.NonPublic)
.Invoke(cancel, new object[] { null });
if (string.IsNullOrEmpty(password_2.Text) ||
password_1.Text.Equals(password_2.Text)) {
if (!string.IsNullOrEmpty(password_2.Text))
proceed.Enabled = true;
password_2.ForeColor = password_forecolor;
if ((Keys)e.KeyValue == Keys.Enter &&
!string.IsNullOrEmpty(password_2.Text))
proceed.GetType()
.GetMethod("OnClick",
BindingFlags.Instance |
BindingFlags.NonPublic)
.Invoke(proceed,
new object[] { new KeyEventArgs(Keys.Enter) });
} else {
proceed.Enabled = false;
password_2.ForeColor = error_forecolor;
}
};
proceed.Bounds = new Rectangle(290, 100, button_width, button_height);
proceed.BackColor = proceed_backcolor;
proceed.ForeColor = proceed_forecolor;
proceed.Font = button_font;
proceed.TextAlign = button_text_alignment;
proceed.Text = "Proceed";
proceed.Enabled = false;
proceed.Click += (sender, e) =>
{
form.Close();
byte[] key_string_bytes = Encoding.UTF8.GetBytes(password_1.Text), key = new byte[64];
password_1.Text = "";
password_2.Text = "";
FileStream file_from = null, file_to = null;
try {
WhirlpoolDigest whirlpool_digest = new WhirlpoolDigest();
whirlpool_digest.BlockUpdate(key_string_bytes, 0, key_string_bytes.Length);
whirlpool_digest.DoFinal(key, 0);
SerpentEngine serpent_engine = new SerpentEngine();
Pkcs7Padding pkcs7_padding = new Pkcs7Padding();
pkcs7_padding.Init(new SecureRandom(key));
PaddedBufferedBlockCipher
padded_buffered_block_cipher = new PaddedBufferedBlockCipher(new CbcBlockCipher(serpent_engine),
pkcs7_padding);
byte[] iv = new byte[padded_buffered_block_cipher.GetBlockSize()];
Array.Copy(key, key.Length - iv.Length, iv, 0, iv.Length);
padded_buffered_block_cipher.Init((en_de_cryption_mode_current == en_de_cryption_mode.encrypt),
new ParametersWithIV(new KeyParameter(key, 31, 32),
iv));
int plaintext_buffer_size = 1024 * padded_buffered_block_cipher.GetBlockSize(),
ciphertext_buffer_size = padded_buffered_block_cipher.GetBlockSize() +
plaintext_buffer_size,
bytes_read_count,
bytes_en_de_crypted_count;
byte[] buffer_from, buffer_to;
if (en_de_cryption_mode_current == en_de_cryption_mode.encrypt) {
buffer_from = new byte[plaintext_buffer_size];
buffer_to = new byte[ciphertext_buffer_size];
} else {
buffer_from = new byte[ciphertext_buffer_size];
buffer_to = new byte[plaintext_buffer_size];
}
file_from = new FileStream(file_path_from, FileMode.Open);
file_to = new FileStream(file_path_to, FileMode.Create);
while (true) {
bytes_read_count = file_from.Read(buffer_from, 0, buffer_from.Length);
if (bytes_read_count == 0) {
break;
}
bytes_en_de_crypted_count = padded_buffered_block_cipher.DoFinal(buffer_from,
0,
bytes_read_count,
buffer_to,
0);
file_to.Write(buffer_to, 0, bytes_en_de_crypted_count);
}
file_from.Close();
file_to.Close();
if (delete_file_path_from)
File.Delete(file_path_from);
for (int i = 0; i < key_string_bytes.Length; i += 1)
key_string_bytes[i] = 0;
for (int i = 0; i < key.Length; i += 1)
key[i] = 0;
whirlpool_digest.Reset();
serpent_engine.Reset();
pkcs7_padding = null;
padded_buffered_block_cipher.Reset();
for (int i = 0; i < iv.Length; i += 1)
iv[i] = 0;
for (int i = 0; i < buffer_from.Length; i += 1)
buffer_from[i] = 0;
for (int i = 0; i < buffer_to.Length; i += 1)
buffer_to[i] = 0;
} catch(Exception exception) {
string message;
if (exception.Message.Contains("pad block corrupted")) {
if (file_from != null) {
file_from.Close();
}
if (file_to != null) {
file_to.Close();
}
try {
File.Delete(file_path_to);
} catch(Exception) {}
message = "A wrong decryption key has been provided.";
} else {
message = exception.Message;
}
alert(message, interactive);
}
};
cancel.Bounds = new Rectangle(200, 100, button_width, button_height);
cancel.BackColor = cancel_backcolor;
cancel.ForeColor = cancel_forecolor;
cancel.Font = button_font;
cancel.TextAlign = button_text_alignment;
cancel.Text = "Cancel";
cancel.Click += (sender, e) =>
{
form.Close();
password_1.Text = "";
password_2.Text = "";
};
form.Controls.Add(password_1_label);
form.Controls.Add(password_2_label);
form.Controls.Add(password_1);
form.Controls.Add(password_2);
form.Controls.Add(proceed);
form.Controls.Add(cancel);
form.ShowDialog();
}