The Encryption Class

Hello,
One of the things the most used "Encryption" Take a look @ this super (Really Super) Class !!!
Encryption + Decryption

Imports System.IO
Imports System.Text
Imports System.Security.Cryptography

Class Encryption
Public Function GetHash(ByVal plainText As String) As String
' ----- Generate a hash. Return an empty string
' if there are any problems.
Dim plainBytes As Byte()
Dim hashEngine As MD5CryptoServiceProvider
Dim hashBytes As Byte()
Dim hashText As String

Try
' ----- Convert the plain text to a byte array.
plainBytes = Encoding.UTF8.GetBytes(plainText)

' ----- Select one of the hash engines.
hashEngine = New MD5CryptoServiceProvider

' ----- Get the hash of the plain text bytes.
hashBytes = hashEngine.ComputeHash(plainBytes)

' ----- Convert the hash bytes to a hexadecimal string.
hashText = Replace(BitConverter.ToString(hashBytes), "-", "")
Return hashText
Catch
Return ""
End Try
End Function

Public Function StringEncrypt(ByVal plainText As String, _
ByVal keyText As String) As String
' ----- Encrypt some text. Return an empty string
' if there are any problems.
Try
' ----- Remove any possible null characters.
Dim workText As String = plainText.Replace(vbNullChar, "")

' ----- Convert plain text to byte array.
Dim workBytes() As Byte = Encoding.UTF8.GetBytes(plainText)

' ----- Convert key string to 32-byte key array.
Dim keyBytes() As Byte = _
Encoding.UTF8.GetBytes(GetHash(keyText))

' ----- Create initialization vector.
Dim IV() As Byte = { _
50, 199, 10, 159, 132, 55, 236, 189, _
51, 243, 244, 91, 17, 136, 39, 230}

' ----- Create the Rijndael engine.
Dim rijndael As New RijndaelManaged

' ----- Bytes will flow through a memory stream.
Dim memoryStream As New MemoryStream()

' ----- Create the cryptography transform.
Dim cryptoTransform As ICryptoTransform
cryptoTransform = _
rijndael.CreateEncryptor(keyBytes, IV)

' ----- Bytes will be processed by CryptoStream.
Dim cryptoStream As New CryptoStream( _
memoryStream, cryptoTransform, _
CryptoStreamMode.Write)

' ----- Move the bytes through the processing stream.
cryptoStream.Write(workBytes, 0, workBytes.Length)
cryptoStream.FlushFinalBlock()

' ----- Convert binary data to a viewable string.
Dim encrypted As String = _
Convert.ToBase64String(memoryStream.ToArray)

' ----- Close the streams.
memoryStream.Close()
cryptoStream.Close()

' ----- Return the encrypted string result.
Return encrypted
Catch
Return ""
End Try
End Function

Public Function StringDecrypt(ByVal encrypted As String, _
ByVal keyText As String) As String
' ----- Decrypt a previously encrypted string. The key
' must match the one used to encrypt the string.
' Return an empty string on error.
Try
' ----- Convert encrypted string to a byte array.
Dim workBytes() As Byte = _
Convert.FromBase64String(encrypted)

' ----- Convert key string to 32-byte key array.
Dim keyBytes() As Byte = _
Encoding.UTF8.GetBytes(GetHash(keyText))

' ----- Create initialization vector.
Dim IV() As Byte = { _
50, 199, 10, 159, 132, 55, 236, 189, _
51, 243, 244, 91, 17, 136, 39, 230}

' ----- Decrypted bytes will be stored in
' a temporary array.
Dim tempBytes(workBytes.Length - 1) As Byte

' ----- Create the Rijndael engine.
Dim rijndael As New RijndaelManaged

' ----- Bytes will flow through a memory stream.
Dim memoryStream As New MemoryStream(workBytes)

' ----- Create the cryptography transform.
Dim cryptoTransform As ICryptoTransform
cryptoTransform = _
rijndael.CreateDecryptor(keyBytes, IV)

' ----- Bytes will be processed by CryptoStream.
Dim cryptoStream As New CryptoStream( _
memoryStream, cryptoTransform, _
CryptoStreamMode.Read)

' ----- Move the bytes through the processing stream.
cryptoStream.Read(tempBytes, 0, tempBytes.Length)

' ----- Close the streams.
memoryStream.Close()
cryptoStream.Close()

' ----- Convert the decrypted bytes to a string.
Dim plainText As String = _
Encoding.UTF8.GetString(tempBytes)

' ----- Return the decrypted string result.
Return plainText.Replace(vbNullChar, "")
Catch
Return ""
End Try
End Function

Public Sub FileEncrypt(ByVal sourceFile As String, _
ByVal destinationFile As String, _
ByVal keyText As String)
' ----- Create file streams.
Dim sourceStream As New FileStream( _
sourceFile, FileMode.Open, FileAccess.Read)
Dim destinationStream As New FileStream( _
destinationFile, FileMode.Create, FileAccess.Write)

' ----- Convert key string to 32-byte key array.
Dim keyBytes() As Byte = _
Encoding.UTF8.GetBytes(GetHash(keyText))

' ----- Create initialization vector.
Dim IV() As Byte = { _
50, 199, 10, 159, 132, 55, 236, 189, _
51, 243, 244, 91, 17, 136, 39, 230}

' ----- Create a Rijndael engine.
Dim rijndael As New RijndaelManaged

' ----- Create the cryptography transform.
Dim cryptoTransform As ICryptoTransform
cryptoTransform = _
rijndael.CreateEncryptor(keyBytes, IV)

' ----- Bytes will be processed by CryptoStream.
Dim cryptoStream As New CryptoStream( _
destinationStream, cryptoTransform, _
CryptoStreamMode.Write)

' ----- Process bytes from one file into the other.
Const BlockSize As Integer = 4096
Dim buffer(BlockSize) As Byte
Dim bytesRead As Integer
Do
bytesRead = sourceStream.Read(buffer, 0, BlockSize)
If (bytesRead = 0) Then Exit Do
cryptoStream.Write(buffer, 0, bytesRead)
Loop

' ----- Close the streams.
cryptoStream.Close()
sourceStream.Close()
destinationStream.Close()
End Sub

Public Sub FileDecrypt(ByVal sourceFile As String, _
ByVal destinationFile As String, _
ByVal keyText As String)

' ----- Create file streams.
Dim sourceStream As New FileStream( _
sourceFile, FileMode.Open, FileAccess.Read)
Dim destinationStream As New FileStream( _
destinationFile, FileMode.Create, FileAccess.Write)

' ----- Convert key string to 32-byte key array.
Dim keyBytes() As Byte = _
Encoding.UTF8.GetBytes(GetHash(keyText))

' ----- Create initialization vector.
Dim IV() As Byte = { _
50, 199, 10, 159, 132, 55, 236, 189, _
51, 243, 244, 91, 17, 136, 39, 230}

' ----- Create a Rijndael engine.
Dim rijndael As New RijndaelManaged

' ----- Create the cryptography transform.
Dim cryptoTransform As ICryptoTransform
cryptoTransform = _
rijndael.CreateDecryptor(keyBytes, IV)

' ----- Bytes will be processed by CryptoStream.
Dim cryptoStream As New CryptoStream( _
destinationStream, cryptoTransform, _
CryptoStreamMode.Write)

' ----- Process bytes from one file into the other.
Const BlockSize As Integer = 4096
Dim buffer(BlockSize) As Byte
Dim bytesRead As Integer
Do
bytesRead = sourceStream.Read(buffer, 0, BlockSize)
If (bytesRead = 0) Then Exit Do
cryptoStream.Write(buffer, 0, bytesRead)
Loop

' ----- Close the streams.
cryptoStream.Close()
sourceStream.Close()
destinationStream.Close()
End Sub
End class