''''MD5 加密函数
Public Shared Function MD5(ByVal strSource As String, ByVal Code As Int16) As String
''''这里用的是ascii编码密码原文,如果要用汉字做密码,可以用UnicodeEncoding,但会与ASP中的MD5函数不兼容
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 i As Integer
Select Case Code
Case 16 ''''选择16位字符的加密结果
For i = 4 To 11
MD5 += Hex(hashvalue(i)).ToLower
Next
Case 32 ''''选择32位字符的加密结果
For i = 0 To 15
MD5 += Hex(hashvalue(i)).ToLower
Next
Case Else ''''Code错误时,返回全部字符串,即32位字符
For i = 0 To hashvalue.Length - 1
MD5 += Hex(hashvalue(i)).ToLower
Next
End Select
End Function