Xin(4), "f7537e82", 6
MD5F4 d, a, b, c, Xin(11), "bd3af235", 10
MD5F4 c, d, a, b, Xin(2), "2ad7d2bb", 15
MD5F4 b, c, d, a, Xin(9), "eb86d391", 21
buf(0) = BigAdd(buf(0), a)
buf(1) = BigAdd(buf(1), b)
buf(2) = BigAdd(buf(2), c)
buf(3) = BigAdd(buf(3), d)
Next loopouter
'''' Extract MD5Hash
hashthis = ""
For loopit = 0 To 3
For loopinner = 3 To 0 Step -1
hashthis = hashthis + Chr(Val("&H" + Mid$(buf(loopit), 1 +
2 * loopinner, 2)))
Next loopinner
Next loopit
'''' And return it
MD5_Calc = hashthis
End Function
Function BigMod32Add(ByVal value1 As String, ByVal value2 As String) A
s String
BigMod32Add = Right$(BigAdd(value1, value2), 8)
End Function
Public Function BigAdd(ByVal value1 As String, ByVal value2 As String)
As String
Dim valueans As String
Dim loopit As Integer, tempnum As Integer
tempnum = Len(value1) - Len(value2)
If tempnum < 0 Then
value1 = Space$(Abs(tempnum)) + value1
ElseIf tempnum > 0 Then
value2 = Space$(Abs(tempnum)) + value2
End If
tempnum = 0
For loopit = Len(value1) To 1 Step -1
tempnum = tempnum + Val("&H" + Mid$(value1, loopit, 1)) + Val(
"&H" + Mid$(value2, loopit, 1))
valueans = Hex$(tempnum Mod 16) + valueans
tempnum = Int(tempnum / 16)
Next loopit
If tempnum <> 0 Then
valueans = Hex$(tempnum) + valueans
End If
BigAdd = Right(valueans, 8)
End Function
Public Function RotLeft(ByVal value1 As String, ByVal rots As Integer)
As String
Dim tempstr As String
Dim loopit As Integer, loopinner As Integer
Dim tempnum As Integer
rots = rots Mod 32
If rots = 0 Then
RotLeft = value1
Exit Function
End If
value1 = Right$(value1, 8)
tempstr = String$(8 - Len(value1), "0") + value1
value1 = ""
'''' Convert to binary
For loopit = 1 To 8
tempnum = Val("&H" + Mid$(tempstr, loopit, 1))
For loopinner = 3 To 0 Step -1
If tempnum And 2 ^ loopinner Then
value1 = value1 + "1"
Else
value1 = value1 + "0"
End If
Next loopinner
Next loopit
tempstr = Mid$(value1, rots + 1) + Left$(value1, rots)
'''' And convert back to hex
value1 = ""
For loopit = 0 To 7
tempnum = 0
For loopinner = 0 To 3
If Val(Mid$(tempstr, 4 * loopit + loopinner + 1, 1)) Then
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
经典加密算法在VB中的实现（3）- RC4
经典加密算法在VB中的实现（4）- DES 经典加密算法在VB中的实现（1）- Base64
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