使用vb.net加密和解密文件。（好像英文靈，中文不靈）

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--- 使用vb.net加密和解密文件。（好像英文靈，中文不靈） (http://www.webasp.net/article/4/3967.htm)

-- 作者：未知
-- 發佈日期： 2003-07-12

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

Module Encrypt
    Private Const sSecretKey As String = "password"

    Public Sub Main()
        EncryptFile("c:\temp\test.txt", _
                        "c:\temp\Encrypted.txt", _
                        sSecretKey)
        DecryptFile("c:\temp\Encrypted.txt", _
                    "c:\temp\Decrypted.txt", _
                    sSecretKey)
    End Sub

    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 DES As New DESCryptoServiceProvider()

        '為DES算法設置安全碼.
        '必須是64位,8個字節
        DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey)

        DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey)

        '創建DES加密碼實例
        Dim desencrypt As ICryptoTransform = DES.CreateEncryptor()
        '
        Dim cryptostream As New CryptoStream(fsEncrypted, _
                                            desencrypt, _
                                            CryptoStreamMode.Write)

        '讀取文件到數組
        Dim bytearrayinput(fsInput.Length - 1) As Byte
        fsInput.Read(bytearrayinput, 0, bytearrayinput.Length)
        '寫到加密文件中
        cryptostream.Write(bytearrayinput, 0, bytearrayinput.Length)
        cryptostream.Close()
    End Sub

    Sub DecryptFile(ByVal sInputFilename As String, _
        ByVal sOutputFilename As String, _
        ByVal sKey As String)

        Dim DES As New DESCryptoServiceProvider()
        DES.Key() = ASCIIEncoding.ASCII.GetBytes(sKey)
        DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey)

        '讀取加密文件
        Dim fsread As New FileStream(sInputFilename, FileMode.Open, FileAccess.Read)
        '
        Dim desdecrypt As ICryptoTransform = DES.CreateDecryptor()
        '
        Dim cryptostreamDecr As New CryptoStream(fsread, desdecrypt, CryptoStreamMode.Read)
        '輸出到解密文件
        Dim fsDecrypted As New StreamWriter(sOutputFilename)
        fsDecrypted.Write(New StreamReader(cryptostreamDecr).ReadToEnd)
        fsDecrypted.Flush()
        fsDecrypted.Close()
    End Sub
End Module

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