DATEIEN VERSCHLÜSSELN IN C#

Video 1 URL: https://www.youtube.com/watch?v=_KHECgSTF5U
Video 2 URL: https://www.youtube.com/watch?v=o7jjpQYRo5g
Video 3 URL: https://www.youtube.com/watch?v=5oQsIoPWdl8
Video 4 URL: https://www.youtube.com/watch?v=KULKmPhzifo
Video 5 URL: https://www.youtube.com/watch?v=OQfDMv-jw5s

Hier findet ihr den Code der init Region:

#region init
CspParameters cspp = new CspParameters();
RSACryptoServiceProvider rsa;

const string EncrFolder = @"c:\AESDocs\Encrypt\";
const string DecrFolder = @"c:\AESDocs\Decrypt\";
const string SrcFolder = @"c:\AESDocs\docs\";

const string PubKeyFile = @"c:\AESDocs\encrypt\rsaPublicKey.txt";

const string keyName = "key01";
#endregion



Hier findet ihr das bttn_verschlussel_click Event:

#region verschlüsseln
private void bttn_verschlusseln_Click(object sender, EventArgs e)
{
brow_ver.Refresh();
if (rsa == null)
MessageBox.Show("Schlüssel nicht gesetzt!");
else
{
openFileDialog1.InitialDirectory = SrcFolder;
if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
string fName = openFileDialog1.FileName;
if (fName != null)
{
FileInfo fInfo = new FileInfo(fName);
string name = fInfo.FullName;
EncryptFile(name);
}
}
}
}
#endregion

Hier der Code zur EncryptFile() Methode:

#region verschlüsselung core
private void EncryptFile(string inFile)
{
RijndaelManaged rjndl = new RijndaelManaged();
rjndl.KeySize = 256;
rjndl.BlockSize = 256;
rjndl.Mode = CipherMode.CBC;
ICryptoTransform transform = rjndl.CreateEncryptor();

byte[] keyEncrypted = rsa.Encrypt(rjndl.Key, false);

byte[] LenK = new byte[4];
byte[] LenIV = new byte[4];

int lKey = keyEncrypted.Length;
LenK = BitConverter.GetBytes(lKey);
int lIV = rjndl.IV.Length;
LenIV = BitConverter.GetBytes(lIV);

int startFileName = inFile.LastIndexOf("\\") + 1;
string outFile = EncrFolder + inFile.Substring(startFileName, inFile.LastIndexOf(".") – startFileName) + ".d3";

using (FileStream outFs = new FileStream(outFile, FileMode.Create))
{

outFs.Write(LenK, 0, 4);
outFs.Write(LenIV, 0, 4);
outFs.Write(keyEncrypted, 0, lKey);
outFs.Write(rjndl.IV, 0, lIV);

using (CryptoStream outStreamEncrypted = new CryptoStream(outFs, transform, CryptoStreamMode.Write))
{
int count = 0;
int offset = 0;

int blockSizeBytes = rjndl.BlockSize / 8;
byte[] data = new byte[blockSizeBytes];
int bytesRead = 0;

using (FileStream inFs = new FileStream(inFile, FileMode.Open))
{
do
{
count = inFs.Read(data, 0, blockSizeBytes);
offset += count;
outStreamEncrypted.Write(data, 0, count);
bytesRead += blockSizeBytes;
}
while (count > 0);
inFs.Close();
}
outStreamEncrypted.FlushFinalBlock();
outStreamEncrypted.Close();
}
outFs.Close();
}

}
#endregion

Hier der Code für die EncryptFile() Methode:

#region verschlüsselung core
private void EncryptFile(string inFile)
{
RijndaelManaged rjndl = new RijndaelManaged();
rjndl.KeySize = 256;
rjndl.BlockSize = 256;
rjndl.Mode = CipherMode.CBC;
ICryptoTransform transform = rjndl.CreateEncryptor();

byte[] keyEncrypted = rsa.Encrypt(rjndl.Key, false);

byte[] LenK = new byte[4];
byte[] LenIV = new byte[4];

int lKey = keyEncrypted.Length;
LenK = BitConverter.GetBytes(lKey);
int lIV = rjndl.IV.Length;
LenIV = BitConverter.GetBytes(lIV);

int startFileName = inFile.LastIndexOf("\\") + 1;
string outFile = EncrFolder + inFile.Substring(startFileName, inFile.LastIndexOf(".") – startFileName) + ".d3";

using (FileStream outFs = new FileStream(outFile, FileMode.Create))
{

outFs.Write(LenK, 0, 4);
outFs.Write(LenIV, 0, 4);
outFs.Write(keyEncrypted, 0, lKey);
outFs.Write(rjndl.IV, 0, lIV);

using (CryptoStream outStreamEncrypted = new CryptoStream(outFs, transform, CryptoStreamMode.Write))
{
int count = 0;
int offset = 0;

int blockSizeBytes = rjndl.BlockSize / 8;
byte[] data = new byte[blockSizeBytes];
int bytesRead = 0;

using (FileStream inFs = new FileStream(inFile, FileMode.Open))
{
do
{
count = inFs.Read(data, 0, blockSizeBytes);
offset += count;
outStreamEncrypted.Write(data, 0, count);
bytesRead += blockSizeBytes;
}
while (count > 0);
inFs.Close();
}
outStreamEncrypted.FlushFinalBlock();
outStreamEncrypted.Close();
}
outFs.Close();
}

}
#endregion

Hier der Code für die DecryptFile() Methode:

#region entschlüsselung core

private void DecryptFile(string inFile)
{
RijndaelManaged rjndl = new RijndaelManaged();
rjndl.KeySize = 256;
rjndl.BlockSize = 256;
rjndl.Mode = CipherMode.CBC;

byte[] LenK = new byte[4];
byte[] LenIV = new byte[4];

string outFile = DecrFolder + inFile.Substring(0, inFile.LastIndexOf(".")) + ".txt";

using (FileStream inFs = new FileStream(EncrFolder + inFile, FileMode.Open))
{

inFs.Seek(0, SeekOrigin.Begin);
inFs.Seek(0, SeekOrigin.Begin);
inFs.Read(LenK, 0, 3);
inFs.Seek(4, SeekOrigin.Begin);
inFs.Read(LenIV, 0, 3);

int lenK = BitConverter.ToInt32(LenK, 0);
int lenIV = BitConverter.ToInt32(LenIV, 0);

int startC = lenK + lenIV + 8;
int lenC = (int)inFs.Length – startC;

byte[] KeyEncrypted = new byte[lenK];
byte[] IV = new byte[lenIV];

inFs.Seek(8, SeekOrigin.Begin);
inFs.Read(KeyEncrypted, 0, lenK);
inFs.Seek(8 + lenK, SeekOrigin.Begin);
inFs.Read(IV, 0, lenIV);
Directory.CreateDirectory(DecrFolder);

byte[] KeyDecrypted = rsa.Decrypt(KeyEncrypted, false);

ICryptoTransform transform = rjndl.CreateDecryptor(KeyDecrypted, IV);

using (FileStream outFs = new FileStream(outFile, FileMode.Create))
{

int count = 0;
int offset = 0;

int blockSizeBytes = rjndl.BlockSize / 8;
byte[] data = new byte[blockSizeBytes];

inFs.Seek(startC, SeekOrigin.Begin);
using (CryptoStream outStreamDecrypted = new CryptoStream(outFs, transform, CryptoStreamMode.Write))
{
do
{
count = inFs.Read(data, 0, blockSizeBytes);
offset += count;
outStreamDecrypted.Write(data, 0, count);

}
while (count > 0);

outStreamDecrypted.FlushFinalBlock();
outStreamDecrypted.Close();
}
outFs.Close();
}
inFs.Close();
}

}
#endregion
--------------------------------------------------------------------------------------
Hier findet ihr noch einmal den gesamten Code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Security.Cryptography;
using System.Windows.Forms;
using MaterialSkin;
using MaterialSkin.Controls;

namespace d3nce_encmaster
{
public partial class Form1 : MaterialForm
{
#region init
CspParameters cspp = new CspParameters();
RSACryptoServiceProvider rsa;

const string EncrFolder = @"c:\AESDocs\Encrypt\";
const string DecrFolder = @"c:\AESDocs\Decrypt\";
const string SrcFolder = @"c:\AESDocs\docs\";

const string PubKeyFile = @"c:\AESDocs\encrypt\rsaPublicKey.txt";

const string keyName = "key01";
#endregion

public Form1()
{
InitializeComponent();
var materialSkinManager = MaterialSkinManager.Instance;
materialSkinManager.AddFormToManage(this);
materialSkinManager.Theme = MaterialSkinManager.Themes.LIGHT;
materialSkinManager.ColorScheme = new ColorScheme(Primary.Indigo800, Primary.Indigo900, Primary.Indigo500, Accent.Indigo200, TextShade.WHITE);
}

private void Form1_Load(object sender, EventArgs e)
{

}

#region verschlüsseln
private void bttn_verschlusseln_Click(object sender, EventArgs e)
{
brow_ver.Refresh();
if (rsa == null)
MessageBox.Show("Schlüssel nicht gesetzt!");
else
{
openFileDialog1.InitialDirectory = SrcFolder;
if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
string fName = openFileDialog1.FileName;
if (fName != null)
{
FileInfo fInfo = new FileInfo(fName);
string name = fInfo.FullName;
EncryptFile(name);
}
}
}
}
#endregion

#region entschlüsseln
private void bttn_entschlusseln_Click(object sender, EventArgs e)
{
brow_ent.Refresh();
if (rsa == null)
MessageBox.Show("Schlüssel nicht gesetzt!");
else
{
openFileDialog2.InitialDirectory = EncrFolder;
if (openFileDialog2.ShowDialog() == DialogResult.OK)
{
string fName = openFileDialog2.FileName;
if (fName != null)
{
FileInfo fi = new FileInfo(fName);
string name = fi.Name;
DecryptFile(name);
}
}
}
}
#endregion

#region public key
private void bttn_pubexp_Click(object sender, EventArgs e)
{
Directory.CreateDirectory(EncrFolder);
StreamWriter sw = new StreamWriter(PubKeyFile, false);
sw.Write(rsa.ToXmlString(false));
sw.Close();
}

private void bttn_pubinp_Click(object sender, EventArgs e)
{
StreamReader sr = new StreamReader(PubKeyFile);
cspp.KeyContainerName = keyName;
rsa = new RSACryptoServiceProvider(cspp);
string keytxt = sr.ReadToEnd();
rsa.FromXmlString(keytxt);
rsa.PersistKeyInCsp = true;
if (rsa.PublicOnly == true)
MessageBox.Show("Key: " + cspp.KeyContainerName + " – Public Only");
else
MessageBox.Show("Key: " + cspp.KeyContainerName + " – Full Key Pair");
sr.Close();
}

private void bttn_asmkey_Click(object sender, EventArgs e)
{
cspp.KeyContainerName = keyName;
rsa = new RSACryptoServiceProvider(cspp);
rsa.PersistKeyInCsp = true;
if (rsa.PublicOnly == true)
MessageBox.Show("Key: " + cspp.KeyContainerName + " – Public Only");
else
MessageBox.Show("Key: " + cspp.KeyContainerName + " – Full Key Pair");

}
#endregion

#region private key
private void bttn_privkey_Click(object sender, EventArgs e)
{
cspp.KeyContainerName = keyName;

rsa = new RSACryptoServiceProvider(cspp);
rsa.PersistKeyInCsp = true;

if (rsa.PublicOnly == true)
MessageBox.Show("Key: " + cspp.KeyContainerName + " – Public Only");
else
MessageBox.Show("Key: " + cspp.KeyContainerName + " – Full Key Pair");

}
#endregion

#region verschlüsselung core
private void EncryptFile(string inFile)
{
RijndaelManaged rjndl = new RijndaelManaged();
rjndl.KeySize = 256;
rjndl.BlockSize = 256;
rjndl.Mode = CipherMode.CBC;
ICryptoTransform transform = rjndl.CreateEncryptor();

byte[] keyEncrypted = rsa.Encrypt(rjndl.Key, false);

byte[] LenK = new byte[4];
byte[] LenIV = new byte[4];

int lKey = keyEncrypted.Length;
LenK = BitConverter.GetBytes(lKey);
int lIV = rjndl.IV.Length;
LenIV = BitConverter.GetBytes(lIV);

int startFileName = inFile.LastIndexOf("\\") + 1;
string outFile = EncrFolder + inFile.Substring(startFileName, inFile.LastIndexOf(".") – startFileName) + ".d3";

using (FileStream outFs = new FileStream(outFile, FileMode.Create))
{

outFs.Write(LenK, 0, 4);
outFs.Write(LenIV, 0, 4);
outFs.Write(keyEncrypted, 0, lKey);
outFs.Write(rjndl.IV, 0, lIV);

using (CryptoStream outStreamEncrypted = new CryptoStream(outFs, transform, CryptoStreamMode.Write))
{
int count = 0;
int offset = 0;

int blockSizeBytes = rjndl.BlockSize / 8;
byte[] data = new byte[blockSizeBytes];
int bytesRead = 0;

using (FileStream inFs = new FileStream(inFile, FileMode.Open))
{
do
{
count = inFs.Read(data, 0, blockSizeBytes);
offset += count;
outStreamEncrypted.Write(data, 0, count);
bytesRead += blockSizeBytes;
}
while (count > 0);
inFs.Close();
}
outStreamEncrypted.FlushFinalBlock();
outStreamEncrypted.Close();
}
outFs.Close();
}

}
#endregion

#region entschlüsselung core

private void DecryptFile(string inFile)
{
RijndaelManaged rjndl = new RijndaelManaged();
rjndl.KeySize = 256;
rjndl.BlockSize = 256;
rjndl.Mode = CipherMode.CBC;

byte[] LenK = new byte[4];
byte[] LenIV = new byte[4];

string outFile = DecrFolder + inFile.Substring(0, inFile.LastIndexOf(".")) + ".txt";

using (FileStream inFs = new FileStream(EncrFolder + inFile, FileMode.Open))
{

inFs.Seek(0, SeekOrigin.Begin);
inFs.Seek(0, SeekOrigin.Begin);
inFs.Read(LenK, 0, 3);
inFs.Seek(4, SeekOrigin.Begin);
inFs.Read(LenIV, 0, 3);

int lenK = BitConverter.ToInt32(LenK, 0);
int lenIV = BitConverter.ToInt32(LenIV, 0);

int startC = lenK + lenIV + 8;
int lenC = (int)inFs.Length – startC;

byte[] KeyEncrypted = new byte[lenK];
byte[] IV = new byte[lenIV];

inFs.Seek(8, SeekOrigin.Begin);
inFs.Read(KeyEncrypted, 0, lenK);
inFs.Seek(8 + lenK, SeekOrigin.Begin);
inFs.Read(IV, 0, lenIV);
Directory.CreateDirectory(DecrFolder);

byte[] KeyDecrypted = rsa.Decrypt(KeyEncrypted, false);

ICryptoTransform transform = rjndl.CreateDecryptor(KeyDecrypted, IV);

using (FileStream outFs = new FileStream(outFile, FileMode.Create))
{

int count = 0;
int offset = 0;

int blockSizeBytes = rjndl.BlockSize / 8;
byte[] data = new byte[blockSizeBytes];

inFs.Seek(startC, SeekOrigin.Begin);
using (CryptoStream outStreamDecrypted = new CryptoStream(outFs, transform, CryptoStreamMode.Write))
{
do
{
count = inFs.Read(data, 0, blockSizeBytes);
offset += count;
outStreamDecrypted.Write(data, 0, count);

}
while (count > 0);

outStreamDecrypted.FlushFinalBlock();
outStreamDecrypted.Close();
}
outFs.Close();
}
inFs.Close();
}

}
#endregion
}
}