Benötigt: .Net Framework 3.5 (AES Cryptosystem)
Test Programm
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Imports Encrpyt.CryptoAES.Crypto Module Module1 Sub Main() Dim enc = New Crypto enc.key = "x4!UnUfugeyaprachuT8DesAst55ew!2" Dim cstring As String = enc.EncryptString("I like encryption!") Console.WriteLine("Encrypted: " & cstring) Console.WriteLine("Decrypted: " & enc.DecryptString(cstring)) Dim k = Console.ReadKey() End Sub End Module |
Encryption Modul
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Imports System.Security.Cryptography Imports System.IO Imports System.Text Module CryptoAES Public Class Crypto Private _key As String Public Property key() As String Get Return _key End Get Set(ByVal value As String) _key = value End Set End Property Public Sub EncryptFile(ByVal sInputFilename As String, _ ByVal sOutputFilename As String, _ ByVal sKey As String) Dim fsInput As New FileStream(sInputFilename, _ FileMode.Open, FileAccess.Read) Dim fsEncrypted As New FileStream(sOutputFilename, _ FileMode.Create, FileAccess.Write) Dim AES As New AesCryptoServiceProvider() 'Set secret key for AES algorithm. 'A 256-bit key and an IV are required for this provider. AES.KeySize = 256 AES.Key = ASCIIEncoding.ASCII.GetBytes(sKey) 'Set the initialization vector. AES.IV = ASCIIEncoding.ASCII.GetBytes(Left(sKey, 16)) 'Create the AES encryptor from this instance. Dim aesencrypt As ICryptoTransform = AES.CreateEncryptor() 'Create the crypto stream that transforms the file stream by using AES encryption. Dim cryptostream As New CryptoStream(fsEncrypted, _ aesencrypt, _ CryptoStreamMode.Write) 'Read the file text to the byte array. Dim bytearrayinput(CInt(fsInput.Length - 1)) As Byte fsInput.Read(bytearrayinput, 0, bytearrayinput.Length) 'Write out the AES encrypted file. cryptostream.Write(bytearrayinput, 0, bytearrayinput.Length) cryptostream.Close() fsInput.Close() End Sub Public Sub DecryptFile(ByVal sInputFilename As String, _ ByVal sOutputFilename As String, _ ByVal sKey As String) Dim AES As New AesCryptoServiceProvider() 'A 64-bit key and an IV are required for this provider. 'Set the secret key for the AES algorithm. AES.Key() = ASCIIEncoding.ASCII.GetBytes(sKey) 'Set the initialization vector. AES.IV = ASCIIEncoding.ASCII.GetBytes(sKey) 'Create the file stream to read the encrypted file back. Dim fsread As New FileStream(sInputFilename, FileMode.Open, FileAccess.Read) 'Create the AES decryptor from the AES instance. Dim aesdecrypt As ICryptoTransform = AES.CreateDecryptor() 'Create the crypto stream set to read and to do a AES decryption transform on incoming bytes. Dim cryptostreamDecr As New CryptoStream(fsread, aesdecrypt, CryptoStreamMode.Read) 'Print out the contents of the decrypted file. Dim fsDecrypted As New StreamWriter(sOutputFilename) fsDecrypted.Write(New StreamReader(cryptostreamDecr).ReadToEnd) fsDecrypted.Flush() fsDecrypted.Close() fsread.Close() End Sub Public Function EncryptString(ByVal sString As String) As String 'Initialize AES Crypto Provider Dim AES As New AesCryptoServiceProvider() 'Set KeySize to 256 Bit AES.KeySize = 256 'Set the initialization vector and the encryption key AES.IV = ASCIIEncoding.ASCII.GetBytes(Left(_key, 16)) AES.Key = ASCIIEncoding.ASCII.GetBytes(_key) 'Create the AES Encryptor Dim aesencrypt As ICryptoTransform = AES.CreateEncryptor 'Convert plain text to bytes Dim plaintext() As Byte = System.Text.Encoding.Unicode.GetBytes(sString) 'Create the Stream Dim ms As New System.IO.MemoryStream 'Create the encoder Dim encStream As New CryptoStream(ms, aesencrypt, CryptoStreamMode.Write) encStream.Write(plaintext, 0, plaintext.Length) encStream.FlushFinalBlock() Return Convert.ToBase64String(ms.ToArray) End Function Public Function DecryptString(ByVal sString As String) As String 'Initialize AES Crypto Provider Dim AES As New AesCryptoServiceProvider() 'Set KeySize to 256 Bit AES.KeySize = 256 'Set the initialization vector and the encryption key AES.IV = ASCIIEncoding.ASCII.GetBytes(Left(_key, 16)) AES.Key = ASCIIEncoding.ASCII.GetBytes(_key) 'Create the AES Decryptor Dim aesdecrypt As ICryptoTransform = AES.CreateDecryptor 'Convert plain text to bytes Dim encryptedstring() As Byte = Convert.FromBase64String(sString) 'Create the Stream Dim ms As New System.IO.MemoryStream 'Create the decoder Dim decStream As New CryptoStream(ms, aesdecrypt, CryptoStreamMode.Write) decStream.Write(encryptedstring, 0, encryptedstring.Length) decStream.FlushFinalBlock() Return System.Text.Encoding.Unicode.GetString(ms.ToArray) End Function End Class End Module |