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MD5加密算法在VB中的实现         ★★★★

MD5加密算法在VB中的实现

作者:闵涛 文章来源:闵涛的学习笔记 点击数:1363 更新时间:2009/4/23 15:42:01
nbsp;          tempnum = tempnum + 2 ^ (3 - loopinner)
            End If
        Next loopinner
        value1 = value1 + Hex$(tempnum)
    Next loopit

    RotLeft = Right(value1, 8)
End Function

Function BigAND(ByVal value1 As String, ByVal value2 As String) As Str
ing
Dim valueans As String
Dim loopit As Integer, tempnum As Integer

    tempnum = Len(value1) - Len(value2)
    If tempnum < 0 Then
value2 = Mid$(value2, Abs(tempnum) + 1)
ElseIf tempnum > 0 Then
        value1 = Mid$(value1, tempnum + 1)
    End If

    For loopit = 1 To Len(value1)
        valueans = valueans + Hex$(Val("&H" + Mid$(value1, loopit, 1))
 And Val("&H" + Mid$(value2, loopit, 1)))
    Next loopit

    BigAND = valueans
End Function

Function BigNOT(ByVal value1 As String) As String
Dim valueans As String
Dim loopit As Integer

    value1 = Right$(value1, 8)
    value1 = String$(8 - Len(value1), "0") + value1
    For loopit = 1 To 8
        valueans = valueans + Hex$(15 Xor Val("&H" + Mid$(value1, loop
it, 1)))
    Next loopit

    BigNOT = valueans
End Function

Function BigOR(ByVal value1 As String, ByVal value2 As String) As Stri
ng
Dim valueans As String
Dim loopit As Integer, tempnum As Integer

    tempnum = Len(value1) - Len(value2)
    If tempnum < 0 Then
valueans = Left$(value2, Abs(tempnum))
value2 = Mid$(value2, Abs(tempnum) + 1)
ElseIf tempnum > 0 Then
        valueans = Left$(value1, Abs(tempnum))
        value1 = Mid$(value1, tempnum + 1)
    End If

    For loopit = 1 To Len(value1)
        valueans = valueans + Hex$(Val("&H" + Mid$(value1, loopit, 1))
 Or Val("&H" + Mid$(value2, loopit, 1)))
    Next loopit

    BigOR = valueans
End Function

Function BigXOR(ByVal value1 As String, ByVal value2 As String) As Str
ing
Dim valueans As String
Dim loopit As Integer, tempnum As Integer

    tempnum = Len(value1) - Len(value2)
    If tempnum < 0 Then
valueans = Left$(value2, Abs(tempnum))
value2 = Mid$(value2, Abs(tempnum) + 1)
ElseIf tempnum > 0 Then
        valueans = Left$(value1, Abs(tempnum))
        value1 = Mid$(value1, tempnum + 1)
    End If

    For loopit = 1 To Len(value1)
        valueans = valueans + Hex$(Val("&H" + Mid$(value1, loopit, 1))
 Xor Val("&H" + Mid$(value2, loopit, 1)))
    Next loopit

    BigXOR = Right(valueans, 8)
End Function


'''' To Be Continue...

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