Text En/De

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

Public Function Encrypt(ByVal text As String, ByVal key As String) As String
        Try
            Dim crp As New TripleDESCryptoServiceProvider
            Dim uEncode As New UnicodeEncoding
            Dim bytPlainText() As Byte = uEncode.GetBytes(text)
            Dim stmCipherText As New MemoryStream
            Dim slt() As Byte = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12}
            Dim pdb As New Rfc2898DeriveBytes(key, slt)
            Dim bytDerivedKey() As Byte = pdb.GetBytes(24)

            crp.Key = bytDerivedKey
            crp.IV = pdb.GetBytes(8)

            Dim csEncrypted As New CryptoStream(stmCipherText, crp.CreateEncryptor(), CryptoStreamMode.Write)

            csEncrypted.Write(bytPlainText, 0, bytPlainText.Length)
            csEncrypted.FlushFinalBlock()
            Return Convert.ToBase64String(stmCipherText.ToArray())
        Catch ex As Exception
            Throw
        End Try
    End Function


















Function Decrypt(ByVal text As String, ByVal key As String) As String

        Dim crp As TripleDESCryptoServiceProvider
        Try
            crp = New TripleDESCryptoServiceProvider
            Dim uEncode As New UnicodeEncoding
            Dim bytCipherText() As Byte = Convert.FromBase64String(text)
            Dim stmPlainText As New MemoryStream
            Dim stmCipherText As New MemoryStream(bytCipherText)
            Dim slt() As Byte = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12}
            Dim pdb As New Rfc2898DeriveBytes(key, slt)
            Dim bytDerivedKey() As Byte = pdb.GetBytes(24)
            crp.Key = bytDerivedKey
            crp.IV = pdb.GetBytes(8)

            Dim csDecrypted As New CryptoStream(stmCipherText, crp.CreateDecryptor(), CryptoStreamMode.Read)
            Dim sw As New StreamWriter(stmPlainText)
            Dim sr As New StreamReader(csDecrypted)
            sw.Write(sr.ReadToEnd)
            sw.Flush()
            csDecrypted.Clear()
            crp.Clear()
            Return uEncode.GetString(stmPlainText.ToArray())
        Catch ex As Exception
            Throw
        End Try

    End Function