本文实例讲述了VB.NET实现的MD5加密算法。分享给大家供大家参考,具体如下:
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Function MD5F( ByVal tempstr As String , ByVal w As String , ByVal X As String , ByVal y As String , ByVal z As String , ByVal Xin As String , ByVal qdata As String , ByVal rots As Integer ) MD5F = BigMod32Add(RotLeft(BigMod32Add(BigMod32Add(w, tempstr), BigMod32Add(Xin, qdata)), rots), X) End Function Sub MD5F1( ByRef w As String , ByVal X As String , ByVal y As String , ByVal z As String , ByVal Xin As String , ByVal qdata As String , ByVal rots As Integer ) Dim tempstr As String tempstr = BigOR(BigAND(X, y), BigAND(BigNOT(X), z)) w = MD5F(tempstr, w, X, y, z, Xin, qdata, rots) End Sub Sub MD5F2( ByRef w As String , ByVal X As String , ByVal y As String , ByVal z As String , ByVal Xin As String , ByVal qdata As String , ByVal rots As Integer ) Dim tempstr As String tempstr = BigOR(BigAND(X, z), BigAND(y, BigNOT(z))) 'tempstr = BigXOR(y, BigAND(z, BigXOR(X, y))) w = MD5F(tempstr, w, X, y, z, Xin, qdata, rots) End Sub Sub MD5F3( ByRef w As String , ByVal X As String , ByVal y As String , ByVal z As String , ByVal Xin As String , ByVal qdata As String , ByVal rots As Integer ) Dim tempstr As String tempstr = BigXOR(BigXOR(X, y), z) 'tempstr = BigXOR(X, BigXOR(y, z)) w = MD5F(tempstr, w, X, y, z, Xin, qdata, rots) End Sub Sub MD5F4( ByRef w As String , ByVal X As String , ByVal y As String , ByVal z As String , ByVal Xin As String , ByVal qdata As String , ByVal rots As Integer ) Dim tempstr As String tempstr = BigXOR(y, BigOR(X, BigNOT(z))) w = MD5F(tempstr, w, X, y, z, Xin, qdata, rots) End Sub Function MD5_Calc( ByVal hashthis As String ) As String Dim buf(4) As String Dim Xin(16) As String Dim tempnum As Integer , tempnum2 As Integer , loopit As Integer , loopouter As Integer , loopinner As Integer Dim a As String , b As String , c As String , d As String , tempstr99 As String tempnum = 8 * Len(hashthis) hashthis = hashthis + Chr(128) 'Add binary 10000000 tempnum2 = 56 - Len(hashthis) Mod 64 If tempnum2 < 0 Then tempnum2 = 64 + tempnum2 End If 'hashthis = hashthis + String(tempnum2, Chr(0)) For loopit = 1 To tempnum2 hashthis = hashthis + Chr(0) Next loopit For loopit = 1 To 8 hashthis = hashthis + Chr(tempnum Mod 256) tempnum = tempnum - tempnum Mod 256 tempnum = tempnum / 256 Next loopit buf(0) = "67452301" buf(1) = "efcdab89" buf(2) = "98badcfe" buf(3) = "10325476" For loopouter = 0 To (Len(hashthis) / 64 - 1) a = buf(0) b = buf(1) c = buf(2) d = buf(3) ' Get the 512 bits For loopit = 0 To 15 Xin(loopit) = "" For loopinner = 1 To 4 'tempstr99 = Hex$(Asc(Mid$(hashthis, 64 * loopouter + 4 * loopit + loopinner, 1))) 'If Len(tempstr99) < 2 Then tempstr99 = "0" + tempstr99 'Xin(loopit) = Xin(loopit) + tempstr99 Xin(loopit) = Hex$(Asc(Mid$(hashthis, 64 * loopouter + 4 * loopit + loopinner, 1))) + Xin(loopit) If Len(Xin(loopit)) Mod 2 Then Xin(loopit) = "0" + Xin(loopit) Next loopinner Next loopit ' 第一轮循环 MD5F1(a, b, c, d, Xin(0), "d76aa478" , 7) MD5F1(d, a, b, c, Xin(1), "e8c7b756" , 12) MD5F1(c, d, a, b, Xin(2), "242070db" , 17) MD5F1(b, c, d, a, Xin(3), "c1bdceee" , 22) MD5F1(a, b, c, d, Xin(4), "f57c0faf" , 7) MD5F1(d, a, b, c, Xin(5), "4787c62a" , 12) MD5F1(c, d, a, b, Xin(6), "a8304613" , 17) MD5F1(b, c, d, a, Xin(7), "fd469501" , 22) MD5F1(a, b, c, d, Xin(8), "698098d8" , 7) MD5F1(d, a, b, c, Xin(9), "8b44f7af" , 12) MD5F1(c, d, a, b, Xin(10), "ffff5bb1" , 17) MD5F1(b, c, d, a, Xin(11), "895cd7be" , 22) MD5F1(a, b, c, d, Xin(12), "6b901122" , 7) MD5F1(d, a, b, c, Xin(13), "fd987193" , 12) MD5F1(c, d, a, b, Xin(14), "a679438e" , 17) MD5F1(b, c, d, a, Xin(15), "49b40821" , 22) ' 第二轮循环 MD5F2(a, b, c, d, Xin(1), "f61e2562" , 5) MD5F2(d, a, b, c, Xin(6), "c040b340" , 9) MD5F2(c, d, a, b, Xin(11), "265e5a51" , 14) MD5F2(b, c, d, a, Xin(0), "e9b6c7aa" , 20) MD5F2(a, b, c, d, Xin(5), "d62f105d" , 5) MD5F2(d, a, b, c, Xin(10), "02441453" , 9) MD5F2(c, d, a, b, Xin(15), "d8a1e681" , 14) MD5F2(b, c, d, a, Xin(4), "e7d3fbc8" , 20) MD5F2(a, b, c, d, Xin(9), "21e1cde6" , 5) MD5F2(d, a, b, c, Xin(14), "c33707d6" , 9) MD5F2(c, d, a, b, Xin(3), "f4d50d87" , 14) MD5F2(b, c, d, a, Xin(8), "455a14ed" , 20) MD5F2(a, b, c, d, Xin(13), "a9e3e905" , 5) MD5F2(d, a, b, c, Xin(2), "fcefa3f8" , 9) MD5F2(c, d, a, b, Xin(7), "676f02d9" , 14) MD5F2(b, c, d, a, Xin(12), "8d2a4c8a" , 20) ' 第三轮循环 MD5F3(a, b, c, d, Xin(5), "fffa3942" , 4) MD5F3(d, a, b, c, Xin(8), "8771f681" , 11) MD5F3(c, d, a, b, Xin(11), "6d9d6122" , 16) MD5F3(b, c, d, a, Xin(14), "fde5380c" , 23) MD5F3(a, b, c, d, Xin(1), "a4beea44" , 4) MD5F3(d, a, b, c, Xin(4), "4bdecfa9" , 11) MD5F3(c, d, a, b, Xin(7), "f6bb4b60" , 16) MD5F3(b, c, d, a, Xin(10), "bebfbc70" , 23) MD5F3(a, b, c, d, Xin(13), "289b7ec6" , 4) MD5F3(d, a, b, c, Xin(0), "eaa127fa" , 11) MD5F3(c, d, a, b, Xin(3), "d4ef3085" , 16) MD5F3(b, c, d, a, Xin(6), "04881d05" , 23) MD5F3(a, b, c, d, Xin(9), "d9d4d039" , 4) MD5F3(d, a, b, c, Xin(12), "e6db99e5" , 11) MD5F3(c, d, a, b, Xin(15), "1fa27cf8" , 16) MD5F3(b, c, d, a, Xin(2), "c4ac5665" , 23) ' 第四轮循环 MD5F4(a, b, c, d, Xin(0), "f4292244" , 6) MD5F4(d, a, b, c, Xin(7), "432aff97" , 10) MD5F4(c, d, a, b, Xin(14), "ab9423a7" , 15) MD5F4(b, c, d, a, Xin(5), "fc93a039" , 21) MD5F4(a, b, c, d, Xin(12), "655b59c3" , 6) MD5F4(d, a, b, c, Xin(3), "8f0ccc92" , 10) MD5F4(c, d, a, b, Xin(10), "ffeff47d" , 15) MD5F4(b, c, d, a, Xin(1), "85845dd1" , 21) MD5F4(a, b, c, d, Xin(8), "6fa87e4f" , 6) MD5F4(d, a, b, c, Xin(15), "fe2ce6e0" , 10) MD5F4(c, d, a, b, Xin(6), "a3014314" , 15) MD5F4(b, c, d, a, Xin(13), "4e0811a1" , 21) MD5F4(a, b, c, d, 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 hashthis = "" For loopit = 0 To 3 For loopinner = 3 To 0 Step -1 hashthis = hashthis + Mid(buf(loopit), 1 + 2 * loopinner, 2) Next loopinner Next loopit MD5_Calc = hashthis End Function Function BigMod32Add( ByVal value1 As String , ByVal value2 As String ) As String BigMod32Add = Right$(BigAdd(value1, value2), 8) End Function Public Function BigAdd( ByVal value1 As String , ByVal value2 As String ) As String Dim valueans As String Dim loopit As Integer , tempnum As Integer tempnum = Len(value1) - Len(value2) If tempnum < 0 Then value1 = Space$(Math.Abs(tempnum)) + value1 ElseIf tempnum > 0 Then value2 = Space$(Math.Abs(tempnum)) + value2 End If tempnum = 0 For loopit = Len(value1) To 1 Step -1 tempnum = tempnum + Val( "&H" + Mid$(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$(8 - Len(value1), "0") + value1 For loopit = 1 To 8 - Len(value1) tempstr = tempstr + "0" Next loopit tempstr = tempstr + value1 value1 = "" ' 转换成二进制形式 For loopit = 1 To 8 tempnum = Val( "&H" + Mid$(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) ' 转换为十六进制 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 String Dim valueans As String Dim loopit As Integer , tempnum As Integer tempnum = Len(value1) - Len(value2) If tempnum < 0 Then value2 = Mid$(value2, Math.Abs(tempnum) + 1) ElseIf tempnum > 0 Then value1 = Mid$(value1, tempnum + 1) End If For loopit = 1 To Len(value1) valueans = valueans + Hex$(Val( "&H" + Mid$(value1, loopit, 1)) And Val( "&H" + Mid$(value2, loopit, 1))) Next loopit BigAND = valueans End Function Function BigNOT( ByVal value1 As String ) As String Dim valueans As String Dim loopit As Integer Dim tempstr As String value1 = Right$(value1, 8) 'value1 = String$(8 - Len(value1), "0") + value1 For loopit = 1 To 8 - Len(value1) tempstr = tempstr + "0" Next loopit tempstr = tempstr + value1 value1 = tempstr For loopit = 1 To 8 valueans = valueans + Hex$(15 Xor Val( "&H" + Mid$(value1, loopit, 1))) Next loopit BigNOT = valueans End Function Function BigOR( ByVal value1 As String , ByVal value2 As String ) As String Dim valueans As String Dim loopit As Integer , tempnum As Integer tempnum = Len(value1) - Len(value2) If tempnum < 0 Then valueans = Left$(value2, Math.Abs(tempnum)) value2 = Mid$(value2, Math.Abs(tempnum) + 1) ElseIf tempnum > 0 Then valueans = Left$(value1, Math.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 String Dim valueans As String Dim loopit As Integer , tempnum As Integer tempnum = Len(value1) - Len(value2) If tempnum < 0 Then valueans = Left$(value2, Math.Abs(tempnum)) value2 = Mid$(value2, Math.Abs(tempnum) + 1) ElseIf tempnum > 0 Then valueans = Left$(value1, Math.Abs(tempnum)) value1 = Mid$(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 |
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