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SHA-1.bas

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An implementation of the SHA-1 hash algorithm. First version, might still contain bugs.
Function HexDefaultSHA1(Message() As Byte) As String
Returns the SHA-1 hash of Message using the default key as a string of hexadecimal numbers.
Function HexSHA1(Message() As Byte, ByVal Key1 As Long, ByVal Key2 As Long, ByVal Key3 As Long, ByVal Key4 As Long) As String
Returns the SHA-1 hash of Message using the key specified by Key1 ... Key4 as a string of hexadecimal numbers.
Sub DefaultSHA1(Message() As Byte, H1 As Long, H2 As Long, H3 As Long, H4 As Long, H5 As Long)
Returns the SHA-1 hash of Message using the default key in H1 ... H5.
Sub SHA1(Message() As Byte, ByVal Key1 As Long, ByVal Key2 As Long, ByVal Key3 As Long, ByVal Key4 As Long, H1 As Long, H2 As Long, H3 As Long, H4 As Long, H5 As Long)
Returns the SHA-1 hash of Message using the key specified by Key1 ... Key4 in H1 ... H5.

This module was originally written as a replacement for a similar module by John Taylor. However, this module should be more efficient, and it uses Byte arrays instead of strings for the message, which makes it suitable for digesting binary data, or text containing international characters.

Note that if you coerce a String into a Byte array, Visual Basic will copy the actual data bytes of the string, which is stored as a sequence of 16 bit Unicode character codes. That means that every character takes two bytes. If this doesn't suit your needs, you'll have to convert the string yourself, for example using the StrConv function.B9A171

LicenseEdit

It's just a straightforward implementation of SHA-1. Since only creative works are copyrightable, this code is in the public domain.B9A171

CodeEdit

'Attribute VB_Name = "SHA1vb" Option Explicit Private Type FourBytes A As Byte B As Byte C As Byte D As Byte End Type Private Type OneLong L As Long End Type Function HexDefaultSHA1(Message() As Byte) As String Dim H1 As Long, H2 As Long, H3 As Long, H4 As Long, H5 As Long DefaultSHA1 Message, H1, H2, H3, H4, H5 HexDefaultSHA1 = DecToHex5(H1, H2, H3, H4, H5) End Function Function HexSHA1(Message() As Byte, ByVal Key1 As Long, ByVal Key2 As Long, ByVal Key3 As Long, ByVal Key4 As Long) As String Dim H1 As Long, H2 As Long, H3 As Long, H4 As Long, H5 As Long SHA1 Message, Key1, Key2, Key3, Key4, H1, H2, H3, H4, H5 HexSHA1 = DecToHex5(H1, H2, H3, H4, H5) End Function Sub DefaultSHA1(Message() As Byte, H1 As Long, H2 As Long, H3 As Long, H4 As Long, H5 As Long) SHA1 Message, &H5A827999, &H6ED9EBA1, &H8F1BBCDC, &HCA62C1D6, H1, H2, H3, H4, H5 End Sub Sub SHA1(Message() As Byte, ByVal Key1 As Long, ByVal Key2 As Long, ByVal Key3 As Long, ByVal Key4 As Long, H1 As Long, H2 As Long, H3 As Long, H4 As Long, H5 As Long) 'CA62C1D68F1BBCDC6ED9EBA15A827999 + "abc" = "A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D" '"abc" = "A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D" Dim U As Long, P As Long Dim FB As FourBytes, OL As OneLong Dim I As Integer Dim W(80) As Long Dim A As Long, B As Long, C As Long, D As Long, E As Long Dim T As Long H1 = &H67452301: H2 = &HEFCDAB89: H3 = &H98BADCFE: H4 = &H10325476: H5 = &HC3D2E1F0 U = UBound(Message) + 1: OL.L = U32ShiftLeft3(U): A = U \ &H20000000: LSet FB = OL 'U32ShiftRight29(U) ReDim Preserve Message(0 To (U + 8 And -64) + 63) Message(U) = 128 U = UBound(Message) Message(U - 4) = A Message(U - 3) = FB.D Message(U - 2) = FB.C Message(U - 1) = FB.B Message(U) = FB.A While P < U For I = 0 To 15 FB.D = Message(P) FB.C = Message(P + 1) FB.B = Message(P + 2) FB.A = Message(P + 3) LSet OL = FB W(I) = OL.L P = P + 4 Next I For I = 16 To 79 W(I) = U32RotateLeft1(W(I - 3) Xor W(I - 8) Xor W(I - 14) Xor W(I - 16)) Next I A = H1: B = H2: C = H3: D = H4: E = H5 For I = 0 To 19 T = U32Add(U32Add(U32Add(U32Add(U32RotateLeft5(A), E), W(I)), Key1), ((B And C) Or ((Not B) And D))) E = D: D = C: C = U32RotateLeft30(B): B = A: A = T Next I For I = 20 To 39 T = U32Add(U32Add(U32Add(U32Add(U32RotateLeft5(A), E), W(I)), Key2), (B Xor C Xor D)) E = D: D = C: C = U32RotateLeft30(B): B = A: A = T Next I For I = 40 To 59 T = U32Add(U32Add(U32Add(U32Add(U32RotateLeft5(A), E), W(I)), Key3), ((B And C) Or (B And D) Or (C And D))) E = D: D = C: C = U32RotateLeft30(B): B = A: A = T Next I For I = 60 To 79 T = U32Add(U32Add(U32Add(U32Add(U32RotateLeft5(A), E), W(I)), Key4), (B Xor C Xor D)) E = D: D = C: C = U32RotateLeft30(B): B = A: A = T Next I H1 = U32Add(H1, A): H2 = U32Add(H2, B): H3 = U32Add(H3, C): H4 = U32Add(H4, D): H5 = U32Add(H5, E) Wend End Sub Function U32Add(ByVal A As Long, ByVal B As Long) As Long If (A Xor B) < 0 Then U32Add = A + B Else U32Add = (A Xor &H80000000) + B Xor &H80000000 End If End Function Function U32ShiftLeft3(ByVal A As Long) As Long U32ShiftLeft3 = (A And &HFFFFFFF) * 8 If A And &H10000000 Then U32ShiftLeft3 = U32ShiftLeft3 Or &H80000000 End Function Function U32ShiftRight29(ByVal A As Long) As Long U32ShiftRight29 = (A And &HE0000000) \ &H20000000 And 7 End Function Function U32RotateLeft1(ByVal A As Long) As Long U32RotateLeft1 = (A And &H3FFFFFFF) * 2 If A And &H40000000 Then U32RotateLeft1 = U32RotateLeft1 Or &H80000000 If A And &H80000000 Then U32RotateLeft1 = U32RotateLeft1 Or 1 End Function Function U32RotateLeft5(ByVal A As Long) As Long U32RotateLeft5 = (A And &H3FFFFFF) * 32 Or (A And &HF8000000) \ &H8000000 And 31 If A And &H4000000 Then U32RotateLeft5 = U32RotateLeft5 Or &H80000000 End Function Function U32RotateLeft30(ByVal A As Long) As Long U32RotateLeft30 = (A And 1) * &H40000000 Or (A And &HFFFC) \ 4 And &H3FFFFFFF If A And 2 Then U32RotateLeft30 = U32RotateLeft30 Or &H80000000 End Function Function DecToHex5(ByVal H1 As Long, ByVal H2 As Long, ByVal H3 As Long, ByVal H4 As Long, ByVal H5 As Long) As String Dim H As String, L As Long DecToHex5 = "00000000 00000000 00000000 00000000 00000000" H = Hex(H1): L = Len(H): Mid(DecToHex5, 9 - L, L) = H H = Hex(H2): L = Len(H): Mid(DecToHex5, 18 - L, L) = H H = Hex(H3): L = Len(H): Mid(DecToHex5, 27 - L, L) = H H = Hex(H4): L = Len(H): Mid(DecToHex5, 36 - L, L) = H H = Hex(H5): L = Len(H): Mid(DecToHex5, 45 - L, L) = H End Function

B9A171

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