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用VB.net编写一个加密解密软件"采用DES算法"这个说法不明确，首先是使用多少位的DES进行加密，通常是128位或192位，其次是，要先把主密钥转化成散列，才能供DES进行加密，转化的方法是什么没有明确，通常是md5，所以有的银行卡说是128位md5 3DS就是指用md5转换主密钥散列，用DES进行加密 ， 但是DES本身是64位（包含校验码），2DES是128位，3DES是192位，但是没有2DES的叫法，所以128位、192位统称3DES
要完整的md5+3DS实例 ， 需要100分以上，要不到我的空间中查找相关的文章
加密解密高手进！VB.NET 谁能给一个MD5或其他的加密算法这个是我之前写的 。在需要时调用即可 。
Public Shared Function Encrypt(ByVal Text As String, ByVal sKey As String) As String
Dim provider As New DESCryptoServiceProvider()
Dim bytes As Byte() = Encoding.[Default].GetBytes(Text)
provider.Key = Encoding.ASCII.GetBytes(FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8))
provider.IV = Encoding.ASCII.GetBytes(FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8))
Dim stream As New MemoryStream()
Dim stream2 As New CryptoStream(stream, provider.CreateEncryptor(), CryptoStreamMode.Write)
stream2.Write(bytes, 0, bytes.Length)
stream2.FlushFinalBlock()
Dim builder As New StringBuilder()
For Each num As Byte In stream.ToArray()
builder.AppendFormat("{0:X2}", num)
Next
Return builder.ToString()
End Function
希望能帮到你
求VB.NET的MD5算法调用下面是完整的类，可以设置任意密码
'DES及md5加密解密----添加引用中添加对system.web的引用 。
Imports System.Security.Cryptography
Imports System
Imports System.Text
Imports System.Web
''' summary
''' DES加密类
''' /summary
''' remarks/remarks
Public Class DESEncrypt
Public Sub DESEncrypt()
End Sub
Public Shared Function Encrypt(ByVal Text As String) As String
Return Encrypt(Text, "12345678")
End Function
Public Shared Function Encrypt(ByVal Text As String, ByVal sKey As String) As String
Dim des As New DESCryptoServiceProvider()
Dim inputByteArray As Byte()
inputByteArray = Encoding.Default.GetBytes(Text)
des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8))
des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8))
Dim ms As New System.IO.MemoryStream()
Dim cs As New CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write)
cs.Write(inputByteArray, 0, inputByteArray.Length)
cs.FlushFinalBlock()
Dim ret As New StringBuilder()
Dim b As Byte
For Each b In ms.ToArray()
ret.AppendFormat("{0:X2}", b)
Next
Return ret.ToString()
End Function
Public Shared Function Decrypt(ByVal Text As String) As String
Return Decrypt(Text, "12345678")
End Function
Public Shared Function Decrypt(ByVal Text As String, ByVal sKey As String) As String
Dim des As New DESCryptoServiceProvider()
Dim len As Integer
len = Text.Length / 2
Dim inputByteArray(len - 1) As Byte
Dim x, i As Integer
For x = 0 To len - 1
i = Convert.ToInt32(Text.Substring(x * 2, 2), 16)
inputByteArray(x) = CType(i, Byte)
Next
des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8))
des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8))
Dim ms As New System.IO.MemoryStream()

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