用VB写的调用SHA1算法的模块代码，模块代码已帖在通用模块上，但在编译窗体代码时显示编译错误“子程序或函数未定义”，出在下面代码的第3行， “StringSHA1”，请高手们指教，子程序或函数应该怎样定义。窗体代码 如下：
Private Sub Command1_Click()
Text2.Text = StringSHA1(Text1.Text)
End Sub
' AUTHORS:
' Adapted by Iain Buchan from Visual Basic code posted at Planet-Source-Code by Peter Girard
' http://www.planetsourcecode.com/xq/ASP/txtCodeId.13565/lngWId.1/qx/vb/scripts/ShowCode.htm
' PURPOSE:
' Creating a secure identifier from person-identifiable data
' The function SecureHash generates a 160-bit (20-hex-digit) message digest for a given message (String).
' It is computationally infeasable to recover the message from the digest.
' The digest is unique to the message within the realms of practical probability.
' The only way to find the source message for a digest is by hashing all possible messages and comparison of their digests.
' REFERENCES:
' For a fuller description see FIPS Publication 180-1:
' http://www.itl.nist.gov/fipspubs/fip180-1.htm
Private Type Word
B0 As Byte
B1 As Byte
B2 As Byte
B3 As Byte
End Type
'Public Function idcode(cr As Range) As String
' Dim tx As String
' Dim ob As Object
' For Each ob In cr
' tx = tx & LCase(CStr(ob.Value2))
' Next
' idcode = sha1(tx)
'End Function
Private Function AndW(w1 As Word, w2 As Word) As Word
AndW.B0 = w1.B0 And w2.B0
AndW.B1 = w1.B1 And w2.B1
AndW.B2 = w1.B2 And w2.B2
AndW.B3 = w1.B3 And w2.B3
End Function
Private Function OrW(w1 As Word, w2 As Word) As Word
OrW.B0 = w1.B0 Or w2.B0
OrW.B1 = w1.B1 Or w2.B1
OrW.B2 = w1.B2 Or w2.B2
OrW.B3 = w1.B3 Or w2.B3
End Function
Private Function XorW(w1 As Word, w2 As Word) As Word
XorW.B0 = w1.B0 Xor w2.B0
XorW.B1 = w1.B1 Xor w2.B1
XorW.B2 = w1.B2 Xor w2.B2
XorW.B3 = w1.B3 Xor w2.B3
End Function
Private Function NotW(w As Word) As Word
NotW.B0 = Not w.B0
NotW.B1 = Not w.B1
NotW.B2 = Not w.B2
NotW.B3 = Not w.B3
End Function
Private Function AddW(w1 As Word, w2 As Word) As Word
Dim i As Long, w As Word
i = CLng(w1.B3) + w2.B3
w.B3 = i Mod 256
i = CLng(w1.B2) + w2.B2 + (i \ 256)
w.B2 = i Mod 256
i = CLng(w1.B1) + w2.B1 + (i \ 256)
w.B1 = i Mod 256
i = CLng(w1.B0) + w2.B0 + (i \ 256)
w.B0 = i Mod 256
AddW = w
End Function
Private Function CircShiftLeftW(w As Word, n As Long) As Word
Dim d1 As Double, d2 As Double
Private Function WordToHex(w As Word) As String
WordToHex = Right$("0" & Hex$(w.B0), 2) & Right$("0" & Hex$(w.B1), 2) _
& Right$("0" & Hex$(w.B2), 2) & Right$("0" & Hex$(w.B3), 2)
End Function
Private Function HexToWord(H As String) As Word
HexToWord = DoubleToWord(Val("&H" & H & "#"))
End Function
Private Function DoubleToWord(n As Double) As Word
DoubleToWord.B0 = Int(DMod(n, 2 ^ 32) / (2 ^ 24))
DoubleToWord.B1 = Int(DMod(n, 2 ^ 24) / (2 ^ 16))
DoubleToWord.B2 = Int(DMod(n, 2 ^ 16) / (2 ^ 8))
DoubleToWord.B3 = Int(DMod(n, 2 ^ 8))
End Function
Private Function WordToDouble(w As Word) As Double
WordToDouble = (w.B0 * (2 ^ 24)) + (w.B1 * (2 ^ 16)) + (w.B2 * (2 ^ 8)) _
+ w.B3
End Function
Private Function DMod(value As Double, divisor As Double) As Double
DMod = value - (Int(value / divisor) * divisor)
If DMod < 0 Then DMod = DMod + divisor
End Function
Private Function F(t As Long, B As Word, C As Word, D As Word) As Word
Select Case t
Case Is <= 19
F = OrW(AndW(B, C), AndW(NotW(B), D))
Case Is <= 39
F = XorW(XorW(B, C), D)
Case Is <= 59
F = OrW(OrW(AndW(B, C), AndW(B, D)), AndW(C, D))
Case Else
F = XorW(XorW(B, C), D)
End Select
End Function
Public Function StringSHA1(inMessage As String) As String
' 计算字符串的SHA1摘要
Dim inLen As Long
Dim inLenW As Word
Dim padMessage As String
Dim numBlocks As Long
Dim w(0 To 79) As Word
Dim blockText As String
Dim wordText As String
Dim i As Long, t As Long
Dim temp As Word
Dim K(0 To 3) As Word
Dim H0 As Word
Dim H1 As Word
Dim H2 As Word
Dim H3 As Word
Dim H4 As Word
Dim A As Word
Dim B As Word
Dim C As Word
Dim D As Word
Dim E As Word
' each 512 byte message block consists of 16 words (W) but W is expanded
For i = 0 To numBlocks - 1
blockText = MidB$(padMessage, (i * 64) + 1, 64)
' initialize a message block
For t = 0 To 15
wordText = MidB$(blockText, (t * 4) + 1, 4)
w(t).B0 = AscB(MidB$(wordText, 1, 1))
w(t).B1 = AscB(MidB$(wordText, 2, 1))
w(t).B2 = AscB(MidB$(wordText, 3, 1))
w(t).B3 = AscB(MidB$(wordText, 4, 1))
Next
' create extra words from the message block
For t = 16 To 79
' W(t) = S^1 (W(t-3) XOR W(t-8) XOR W(t-14) XOR W(t-16))
w(t) = CircShiftLeftW(XorW(XorW(XorW(w(t - 3), w(t - 8)), _
w(t - 14)), w(t - 16)), 1)
Next
' make initial assignments to the buffer
A = H0
B = H1
C = H2
D = H3
E = H4
' process the block
For t = 0 To 79
temp = AddW(AddW(AddW(AddW(CircShiftLeftW(A, 5), _
F(t, B, C, D)), E), w(t)), K(t \ 20))
E = D
D = C
C = CircShiftLeftW(B, 30)
B = A
A = temp
Next
H0 = AddW(H0, A)
H1 = AddW(H1, B)
H2 = AddW(H2, C)
H3 = AddW(H3, D)
H4 = AddW(H4, E)
Next
Public Function Sha1(inMessage() As Byte) As String
' 计算字节数组的SHA1摘要
Dim inLen As Long
Dim inLenW As Word
Dim numBlocks As Long
Dim w(0 To 79) As Word
Dim blockText As String
Dim wordText As String
Dim t As Long
Dim temp As Word
Dim K(0 To 3) As Word
Dim H0 As Word
Dim H1 As Word
Dim H2 As Word
Dim H3 As Word
Dim H4 As Word
Dim A As Word
Dim B As Word
Dim C As Word
Dim D As Word
Dim E As Word
Dim i As Long
Dim lngPos As Long
Dim lngPadMessageLen As Long
Dim padMessage() As Byte
' each 512 byte message block consists of 16 words (W) but W is expanded
' to 80 words
For i = 0 To numBlocks - 1
' initialize a message block
For t = 0 To 15
w(t).B0 = padMessage(lngPos)
w(t).B1 = padMessage(lngPos + 1)
w(t).B2 = padMessage(lngPos + 2)
w(t).B3 = padMessage(lngPos + 3)
lngPos = lngPos + 4
Next
' create extra words from the message block
For t = 16 To 79
' W(t) = S^1 (W(t-3) XOR W(t-8) XOR W(t-14) XOR W(t-16))
w(t) = CircShiftLeftW(XorW(XorW(XorW(w(t - 3), w(t - 8)), _
w(t - 14)), w(t - 16)), 1)
Next
' make initial assignments to the buffer
A = H0
B = H1
C = H2
D = H3
E = H4
' process the block
For t = 0 To 79
temp = AddW(AddW(AddW(AddW(CircShiftLeftW(A, 5), _
F(t, B, C, D)), E), w(t)), K(t \ 20))
E = D
D = C
C = CircShiftLeftW(B, 30)
B = A
A = temp
Next
H0 = AddW(H0, A)
H1 = AddW(H1, B)
H2 = AddW(H2, C)
H3 = AddW(H3, D)
H4 = AddW(H4, E)
Next
