主题：MD5加密

Public Function MD5(ByVal strSource As String, ByVal Code As Int16) As String

Dim dataToHash As Byte() = (New System.Text.ASCIIEncoding).GetBytes(strSource)

Dim hashvalue As Byte() = CType(System.Security.Cryptography.CryptoConfig.CreateFromName("MD5"), System.Security.Cryptography.HashAlgorithm).ComputeHash(dataToHash)

Dim ATR As String = ""

Dim i As Integer

Select Case Code

    Case 16      '选择16位字符的加密结果

        For i = 4 To 11

            ATR &= Hex(hashvalue(i)).PadLeft(2, "0").ToLower

            

        Next

    Case 32      '选择32位字符的加密结果

        For i = 0 To 15

            ATR &= Hex(hashvalue(i)).PadLeft(2, "0").ToLower

        Next

    Case Else       'Code错误时,返回全部字符串,即32位字符

        For i = 0 To 15

            ATR &= Hex(hashvalue(i)).PadLeft(2, "0").ToLower

        Next

End Select

Return ATR

End Function