VB的MD5加密算法（支持中文）

Option Explicit '=====标准模块级源码=====

Type MD5_CTX
      dwNUMa      As Long
      dwNUMb      As Long
      Buffer(15)  As Byte
      cIN(63)     As Byte
      cDig(15)    As Byte
End Type

Private Declare Sub MD5Init Lib "advapi32" (lpContext As MD5_CTX)
Private Declare Sub MD5Final Lib "advapi32" (lpContext As MD5_CTX)
Private Declare Sub MD5Update Lib "advapi32" (lpContext As MD5_CTX, ByRef lpBuffer As Any, ByVal BufSize As Long)
 
Private stcContext As MD5_CTX

Private Declare Function WideCharToMultiByte Lib "kernel32" (ByVal CodePage As Long, ByVal dwFlags As Long, ByVal lpWideCharStr As Long, ByVal cchWideChar As Long, ByRef lpMultiByteStr As Any, ByVal cchMultiByte As Long, ByVal lpDefaultChar As Long, ByVal lpUsedDefaultChar As Long) As Long

Public Function GetMD5Text() As String
   Dim sResult As String, i&
   If (stcContext.dwNUMa = 0) Then
      sResult = vbNullString
   Else
      sResult = Space$(32)
      For i = 0 To 15
         Mid$(sResult, i + i + 1) = Right$("0" & Hex$(stcContext.cDig(i)), 2)
      Next
   End If
   GetMD5Text = LCase(sResult)       ' LCase$(sResult) '字母小写
End Function