Restructure Base

Base/Encryption/EncryptionLegacy.vb

@@ -0,0 +1,85 @@
+Imports System.Security.Cryptography
+Imports System.Data
+Imports System.Data.SqlClient
+
+Public Class EncryptionLegacy
+    Private TripleDes As New TripleDESCryptoServiceProvider
+    Private DEFAULT_KEY As String = "!35452didalog="
+    Private SALT_VALUE As String = "!Didalog35452Heuchelheim="
+
+    Sub New()
+        TripleDes.Key = TruncateHash(DEFAULT_KEY, TripleDes.KeySize \ 8)
+        TripleDes.IV = TruncateHash("", TripleDes.BlockSize \ 8)
+    End Sub
+
+    Sub New(key As String)
+        ' Initialize the crypto provider.
+        TripleDes.Key = TruncateHash(key, TripleDes.KeySize \ 8)
+        TripleDes.IV = TruncateHash("", TripleDes.BlockSize \ 8)
+    End Sub
+
+    Private Function TruncateHash(ByVal key As String, ByVal length As Integer) As Byte()
+        Dim sha1 As New SHA1CryptoServiceProvider
+
+        ' Hash the key.
+        Dim keyBytes() As Byte =
+            System.Text.Encoding.Unicode.GetBytes(key)
+        Dim hash() As Byte = sha1.ComputeHash(keyBytes)
+
+        ' Truncate or pad the hash.
+        ReDim Preserve hash(length - 1)
+        Return hash
+    End Function
+
+    <DebuggerStepThrough>
+    Public Function EncryptData(ByVal plaintext As String) As String
+        Try
+            ' Convert the plaintext string to a byte array.
+            Dim plaintextBytes() As Byte =
+                System.Text.Encoding.Unicode.GetBytes(SALT_VALUE & plaintext)
+
+            ' Create the stream.
+            Dim ms As New System.IO.MemoryStream
+            ' Create the encoder to write to the stream.
+            Dim encStream As New CryptoStream(ms,
+                TripleDes.CreateEncryptor(),
+                System.Security.Cryptography.CryptoStreamMode.Write)
+
+            ' Use the crypto stream to write the byte array to the stream.
+            encStream.Write(plaintextBytes, 0, plaintextBytes.Length)
+            encStream.FlushFinalBlock()
+
+            ' Convert the encrypted stream to a printable string.
+            Return Convert.ToBase64String(ms.ToArray)
+        Catch ex As Exception
+            Return plaintext
+        End Try
+    End Function
+
+    'Entschlüsselt die Zeichenfolge
+    <DebuggerStepThrough>
+    Public Function DecryptData(ByVal EncryptedText As String) As String
+        Try
+            ' Convert the encrypted text string to a byte array.
+            Dim oEncryptedBytes() As Byte = Convert.FromBase64String(EncryptedText)
+
+            ' Create the stream.
+            Dim oMemoryStream As New System.IO.MemoryStream
+            ' Create the decoder to write to the stream.
+            Dim oCryptoStream As New CryptoStream(oMemoryStream,
+                TripleDes.CreateDecryptor(),
+                System.Security.Cryptography.CryptoStreamMode.Write)
+
+            ' Use the crypto stream to write the byte array to the stream.
+            oCryptoStream.Write(oEncryptedBytes, 0, oEncryptedBytes.Length)
+            oCryptoStream.FlushFinalBlock()
+            Dim oResult = System.Text.Encoding.Unicode.GetString(oMemoryStream.ToArray)
+            oResult = oResult.Replace(SALT_VALUE, "")
+            ' Convert the plaintext stream to a string.
+            Return oResult
+        Catch ex As Exception
+            Return EncryptedText
+        End Try
+    End Function
+End Class
+