<%@LANGUAGE="VBSCRIPT"%> <% 'ASP Security Image Generator v4.0 - 13/July/2008 'Generate images to make a CAPTCHA test '© 2006-2007 Emir Tüzül. All rights reserved. 'http://www.tipstricks.org 'This program is free software; you can redistribute it and/or 'modify it under the terms of the Common Public License 'as published by the Open Source Initiative OSI; either version 1.0 'of the License, or any later version. 'This program is distributed in the hope that it will be useful, 'but WITHOUT ANY WARRANTY; without even the implied warranty of 'MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 'Common Public License for more details. '*[null pixel]Numbers[repeat count], #[text]Numbers[repeat count], &[row reference]number[referenced row index] 'First row [font height, chars...] 'Following rows [char width, pixel maps...] FontMap = Array(_ split("13,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z,0,1,2,3,4,5,6,7,8,9",",") ,_ split("14,*5#4*5,*4#6*4,&2,&2,*3#3*2#3*3,&5,*2#4*2#4*2,*2#3*4#3*2,*2#10*2,*1#12*1,*1#3*6#3*1,&11,#3*8#3",",") ,_ split("11,#8*3,#10*1,#3*4#3*1,&3,&3,&1,&2,#3*4#4,#3*5#3,&9,&8,&2,#9*2",",") ,_ split("11,*4#6*1,*2#9,*1#4*4#2,*1#3*6#1,#3*8,&5,&5,&5,&5,&4,&3,&2,&1",",") ,_ split("12,#8*4,#10*2,#3*4#4*1,#3*5#3*1,#3*6#3,&5,&5,&5,&5,&4,&3,&2,&1",",") ,_ split("9,#9,&1,#3*6,&3,&3,#8*1,&6,&3,&3,&3,&3,&1,&1",",") ,_ split("9,#9,&1,#3*6,&3,&3,&1,&1,&3,&3,&3,&3,&3,&3",",") ,_ split("13,*4#7,*2#11,*1#4*5#3,*1#3*8#1,#3,#3,#3*4#6,&7,#3*7#3,*1#3*6#3,*1#5*4#3,&2,&1",",") ,_ split("11,#3*5#3,&1,&1,&1,&1,#11,&6,&1,&1,&1,&1,&1,&1",",") ,_ split("7,#7,#7,*2#3,&3,&3,&3,&3,&3,&3,&3,&3,&1,&1",",") ,_ split("8,*2#6,&1,*5#3,&3,&3,&3,&3,&3,&3,&3,*4#4,#7,#6",",") ,_ split("12,#3*5#4,#3*4#4,#3*3#4,#3*2#4,#3*2#3,#3*1#3,#7,#8,&5,#3*3#3,#3*4#3,#3*5#3,&1",",") ,_ split("9,#3,#3,#3,#3,#3,#3,#3,#3,#3,#3,#3,#9,#9",",") ,_ split("13,#3*7#3,#4*5#4,&2,#5*3#5,&4,#6*1#6,#3*1#2*1#2*1#3,#3*1#5*1#3,#3*2#3*2#3,&9,#3*7#3,&11,&11",",") ,_ split("11,#4*4#3,#5*3#3,&2,#6*2#3,&4,#3*1#3*1#3,&6,#3*2#6,&8,#3*3#5,&10,#3*4#4,#3*5#3",",") ,_ split("13,*4#5,*2#9,*1#4*3#4,*1#3*5#3,#3*7#3,&5,&5,&5,&5,&4,&3,&2,&1",",") ,_ split("10,#8,#9,#3*3#4,#3*4#3,&4,&4,&3,&2,#7,#3,#3,#3,#3",",") ,_ split("13,*3#6,*2#8,*1#3*4#3,*1#2*6#2,#2*8#2,&5,&5,#2*4#1*3#2,#2*4#2*2#2,*1#2*4#4,&3,*2#10,*3#6*2#2",",") ,_ split("12,#8,#9,#3*4#3,&3,&3,#3*3#4,&2,&1,#3*2#4,#3*3#3,&3,#3*4#4,#3*5#4",",") ,_ split("11,*3#6,*1#9,#4*4#2,#3*6#1,#4,#8,&2,*3#8,*7#4,#1*7#3,#3*4#4,#10,*1#7",",") ,_ split("11,#11,&1,*4#3,&3,&3,&3,&3,&3,&3,&3,&3,&3,&3,&3",",") ,_ split("11,#3*5#3,&1,&1,&1,&1,&1,&1,&1,&1,&1,#4*3#4,*1#9,*3#5",",") ,_ split("14,#3*8#3,*1#3*6#3,&2,*1#3*5#4,*2#3*4#3,&5,*3#3*2#3,&7,&7,*4#6,&10,&10,*5#4",",") ,_ split("17,#3*4#3*4#3,&1,#3*3#5*3#3,*1#3*2#2*1#2*2#3,&4,*1#3*1#3*1#3*1#3,&6,*1#3*1#2*3#2*1#3,&8,*2#5*3#5,&10,*2#4*5#4,&12",",") ,_ split("14,#4*6#4,*1#4*4#4,*2#4*2#4,*3#3*2#3,*3#8,*4#6,*5#4,&6,&5,&4,&3,&2,&1",",") ,_ split("13,#4*5#4,*1#3*5#3,*2#3*3#3,*2#4*1#4,*3#3*1#3,*3#7,*4#5,*5#3,&8,&8,&8,&8,&8",",") ,_ split("10,#10,&1,*6#4,*5#4,*5#3,*4#3,*3#4,*3#3,*2#3,*1#4,#4,&1,&1",",") ,_ split("10,*3#4*3,*1#8*1,*1#3*2#3*1,#3*4#3,&4,&4,&4,&4,&4,&4,&3,&2,&1",",") ,_ split("9,*3#3*3,&1,#6*3,&3,*3#3*3,&5,&5,&5,&5,&5,&5,#9,&12",",") ,_ split("10,*1#6*3,#8*2,#2*3#4*1,#1*5#3*1,*6#3*1,&5,*5#3*2,*4#4*2,*3#4*3,*2#4*4,*1#4*5,#10,&12",",") ,_ split("11,*1#8*2,#10*1,#3*5#3,#1*7#3,*7#3*1,*3#6*2,*3#7*1,*7#4,*8#3,&4,#3*4#4,&2,*1#7*3",",") ,_ split("12,*6#4*2,*5#5*2,&2,*4#2*1#3*2,*3#3*1#3*2,*2#3*2#3*2,*1#3*3#3*2,#3*4#3*2,#12,&9,*7#3*2,&11,&11",",") ,_ split("11,*1#10,&1,*1#3*7,&3,*1#8*2,*1#9*1,*7#4,*8#3,&8,#1*7#3,#3*4#3*1,#10*1,*1#7*3",",") ,_ split("11,*4#6*1,*2#8*1,*1#4*6,*1#3*7,#3*1#5*2,#10*1,#3*4#4,#3*5#3,&8,&8,*1#3*3#3*1,*1#9*1,*3#5*3",",") ,_ split("11,#11,&1,*7#4,*7#3*1,*6#4*1,*6#3*2,*5#3*3,*4#4*3,*4#3*4,*3#4*4,*3#3*5,*2#3*6,*1#4*6",",") ,_ split("11,*2#7*2,*1#9*1,#3*4#4,#3*5#3,#4*3#3*1,*1#8*2,&1,*1#3*1#5*1,&4,&4,#4*3#4,&2,*2#6*3",",") ,_ split("11,*3#5*3,*1#9*1,*1#3*3#3*1,#3*5#3,&4,&4,#4*4#3,*1#10,*2#5*1#3,*7#3*1,*6#4*1,*1#8*2,*1#6*4",",") _ )'Previous row must end with _ '#Begin ColorMap const BmpColorMap = "FFFFFF00ED9D6300AC240000" ColorMap = Array(_ split("00,01,02",",") _ )'End ColorMap '#Auto calculated variables dim ImageWidth, ImageHeight, arrTextWidth(), TextHeight, LeftMargin, arrTopMargin(), CursorPos dim BmpEndLine, BColor, TColor, NColor dim i, j, k, x, y '#Editable consts and variables dim Bitmap(25,130) '[Height,Width] const CodeLength = 6 'Secure code length (Max:8) const CodeType = 0 '0[Random numbers], 1[Random chars and numbers], 2[Fake word] const CharTracking = 2 'Set the tracking between two characters const RndTopMargin = true 'Randomize top margin every character const NoiseEffect = 2 '0[none], 1[sketch], 2[random foreground lines], 3[random background lines], 4[1 and 3 (Recommed maximum NoiseLine=4)] const NoiseLine = 7 'Low values make easy OCR, high values decrease readability const MinLineLength = 6 'Minimum noise line length const SessionName = "ASPCAPTCHA" 'Where store your secure code '#Subroutines and functions function CreateGUID(valLength) if CodeType = 1 then strValid = "A0B1C2D3E4F5G6H7I8J9K8L7M6N5O4P3Q2R1S0T1U2V3W4X5Y6Z7" else strValid = "0516273849" end if tmpGUID = vbNullString tmpChr = vbNullString Randomize(Timer) for cGUID=1 to valLength do tmpChr = Mid(strValid, Int(Rnd(1) * Len(strValid)) + 1, 1) loop while CStr(tmpChr) = CStr(Right(tmpGUID,1)) tmpGUID = tmpGUID & tmpChr Next CreateGUID = tmpGUID end function function FakeWord(valLength) arrChars = Array("AEIOU", "BCDFGHJKLMNPQRSTVWXYZ") cVowel = 0 cConsonant = 0 tmpWord = vbNullString Randomize(Timer) for cWord=1 to valLength if (cWord=2) or ((valLength > 1) and (cWord = valLength)) then ixChars = 1-ixChars elseif (cVowel < 2) and (cConsonant < 2) then ixChars = Int(Rnd(1) * 2) elseif (cVowel < 2) then ixChars = 0 elseif (cConsonant < 2) then ixChars = 1 end if Pattern = arrChars(ixChars) tmpWord = tmpWord & Mid(Pattern, Int(Rnd(1) * Len(Pattern)) + 1, 1) if ixChars = 0 then cVowel = cVowel + 1 cConsonant = 0 else cVowel = 0 cConsonant = cConsonant + 1 end if next FakeWord = tmpWord end function function RndInterval(valMin,valMax) Randomize(Timer) RndInterval = Int(((valMax - valMin + 1) * Rnd()) + valMin) end function function GetCharMap(valChr) dim i, j j = 0 for i=1 to UBound(FontMap(0)) if CStr(FontMap(0)(i)) = CStr(valChr) then j = i exit for end if next if j > 0 then GetCharMap = FontMap(j) else GetCharMap = Array(0) end if end function sub WriteCanvas(byval valChr, byval valTopMargin) dim i, j, k, curPos, tmpChr, arrChrMap, strPixMap, drawPixel, pixRepeat 'find char map arrChrMap = GetCharMap(valChr) if UBound(arrChrMap) < 1 then exit sub end if 'write char for i=1 to UBound(arrChrMap) 'get pixel map active line strPixMap = arrChrMap(i) if Left(strPixMap,1) = "&" then j = Mid(strPixMap,2) if (IsNumeric(j) = true) then strPixMap = arrChrMap(CInt(j)) else strPixMap = vbNullString end if end if strPixMap = Trim(strPixMap) 'drawing pixel curPos = CursorPos drawPixel = false pixRepeat = vbNullString for j=1 to Len(strPixMap) tmpChr = Mid(strPixMap,j,1) if (IsNumeric(tmpChr) = true) and (j < Len(strPixMap)) then pixRepeat = pixRepeat & tmpChr else 'end pixel map? if IsNumeric(tmpChr) = true then pixRepeat = pixRepeat & tmpChr end if 'draw pixel if (drawPixel = true) and (IsNumeric(pixRepeat) = true) then for k=1 to CInt(pixRepeat) curPos = curPos + 1 Bitmap((valTopMargin + i),curPos) = TColor next elseif IsNumeric(pixRepeat) = true then curPos = curPos + CInt(pixRepeat) end if 'what is new command? if tmpChr = "#" then drawPixel = true else drawPixel = false end if pixRepeat = vbNullString end if next next end sub sub PrepareBitmap(valSecureCode) dim i, j 'image dimensions ImageWidth = UBound(Bitmap,2) ImageHeight = UBound(Bitmap,1) 'char and text width redim arrTextWidth(CodeLength) arrTextWidth(0) = 0 for i=1 to CodeLength arrTextWidth(i) = CInt(GetCharMap(Mid(secureCode,i,1))(0)) arrTextWidth(0) = arrTextWidth(0) + arrTextWidth(i) next arrTextWidth(0) = arrTextWidth(0) + ((CodeLength - 1) * CharTracking) 'text height TextHeight = CInt(FontMap(0)(0)) 'left margin LeftMargin = Round((ImageWidth - arrTextWidth(0)) / 2) 'top margin redim arrTopMargin(CodeLength) arrTopMargin(0) = Round((ImageHeight - TextHeight) / 2) if RndTopMargin = true then for i=1 to CodeLength arrTopMargin(i) = RndInterval(Int(arrTopMargin(0) / 2),(arrTopMargin(0) + Round(arrTopMargin(0) / 2))) next else for i=1 to CodeLength arrTopMargin(i) = arrTopMargin(0) next end if 'color selection i = RndInterval(0,UBound(ColorMap)) BColor = ColorMap(i)(0) NColor = ColorMap(i)(1) TColor = ColorMap(i)(2) 'Apply background effect if NoiseEffect = 3 then AddNoise() end if 'write text for i=1 to CodeLength 'calculate cursor pos CursorPos = 0 for j=(i-1) to 1 step -1 CursorPos = CursorPos + arrTextWidth(j) + CharTracking next CursorPos = LeftMargin + CursorPos 'write active char WriteCanvas Mid(secureCode,i,1),arrTopMargin(i) next end sub sub DrawLine(x0, y0, x1, y1, valClr) 'Reference from Donald Hearn and M. Pauline Baker, Computer Graphics C Version dim m, b, dx, dy if (NoiseEffect = 4) and (Bitmap(y0,x0) = TColor) then clrNoise = vbNullString else clrNoise = valClr end if Bitmap(y0,x0) = clrNoise dx = x1 - x0 dy = y1 - y0 if Abs(dx) > Abs(dy) then m = (dy / dx) b = y0 - (m * x0) if dx < 0 then dx = -1 else dx = 1 end if do while x0 <> x1 x0 = x0 + dx if (NoiseEffect = 4) and (Bitmap(Round((m * x0) + b),x0) = TColor) then clrNoise = vbNullString else clrNoise = valClr end if Bitmap(Round((m * x0) + b),x0) = clrNoise loop elseif dy <> 0 then m = (dx / dy) b = x0 - (m * y0) if dy < 0 then dy = -1 else dy = 1 end if do while y0 <> y1 y0 = y0 + dy if (NoiseEffect = 4) and (Bitmap(y0,Round((m * y0) + b)) = TColor) then clrNoise = vbNullString else clrNoise = valClr end if Bitmap(y0,Round((m * y0) + b)) = clrNoise loop end if end sub sub AddNoise() dim median, i, j, x0, y0, x1, y1, dx, dy, dxy if NoiseEffect = 1 then clrNoise = vbNullString else clrNoise = NColor end if for i=1 to NoiseLine x0 = RndInterval(1,ImageWidth) y0 = RndInterval(1,ImageHeight) x1 = RndInterval(1,ImageWidth) y1 = RndInterval(1,ImageHeight) 'Check minimum line length dx = Abs(x1 - x0) dy = Abs(y1 - y0) median = Round(Sqr((dx * dx) + (dy * dy))/2) if median < MinLineLength then dxy = MinLineLength - median if x1 < x0 then dx = -1 else dx = 1 end if if y1 < y0 then dy = -1 else dy = 1 end if for j=1 to dxy if ((x1 + dx) < 1) or ((x1 + dx) > ImageWidth) or ((y1 + dy) < 1) or ((y1 + dy) > ImageHeight) then exit for end if x1 = x1 + dx y1 = y1 + dy next end if 'Draw noise line DrawLine x0,y0,x1,y1,clrNoise next end sub function FormatHex(byval valHex,byval fixByte,fixDrctn,valReverse) fixByte = fixByte * 2 tmpLen = Len(valHex) if fixByte > tmpLen then tmpFixHex = String((fixByte - tmpLen),"0") if fixDrctn = 1 then valHex = valHex & tmpFixHex else valHex = tmpFixHex & valHex end if end if if valReverse = true then tmpHex = vbNullString for cFrmtHex=1 to Len(valHex) step 2 tmpHex = Mid(valHex,cFrmtHex,2) & tmpHex next FormatHex = tmpHex else FormatHex = CStr(valHex) end if end function sub SendHex(valHex) for cHex = 1 to Len(valHex) step 2 Response.BinaryWrite ChrB(CByte("&H" & Mid(valHex,cHex,2))) next end sub sub SendBitmap() if (ImageWidth mod 4) <> 0 then BmpEndLine = String((4-(ImageWidth mod 4))*2,"0") else BmpEndLine = vbNullString end if BmpInfoHeader = Array("28000000","00000000","00000000","0100","0800","00000000","00000000","120B0000","120B0000","00000000","00000000") BmpInfoHeader(1) = FormatHex(Hex(ImageWidth),4,0,true) BmpInfoHeader(2) = FormatHex(Hex(ImageHeight),4,0,true) BmpInfoHeader(6) = FormatHex(Hex((ImageHeight * ImageWidth) + (ImageHeight * (Len(BmpEndLine) / 2))),4,0,true) BmpInfoHeader(9) = FormatHex(Hex(Len(BmpColorMap)/8),4,0,true) BmpInfoHeader(10) = BmpInfoHeader(9) BmpHeader = Array("424D","00000000","0000","0000","00000000") BmpHeader(1) = FormatHex(Hex((Len(Join(BmpHeader,"")) / 2) + (Len(Join(BmpInfoHeader,"")) / 2) + (Len(BmpColorMap) / 2) + (ImageHeight * ImageWidth) + (ImageHeight * (Len(BmpEndLine) / 2))),4,0,true) BmpHeader(4) = FormatHex(Hex((Len(Join(BmpHeader,"")) / 2) + (Len(Join(BmpInfoHeader,"")) / 2) + (Len(BmpColorMap) / 2)),4,0,true) Response.Clear Response.Buffer = True Response.ContentType = "image/bmp" Response.AddHeader "Content-Disposition", "inline; filename=captcha.bmp" Response.CacheControl = "no-cache" Response.AddHeader "Pragma", "no-cache" Response.Expires = -1 SendHex(Join(BmpHeader,"")) SendHex(Join(BmpInfoHeader,"")) SendHex(BmpColorMap) for y=ImageHeight to 1 step -1 for x=1 to ImageWidth tmpHex = Bitmap(y,x) if tmpHex = vbNullString then SendHex(BColor) else SendHex(tmpHex) end if next SendHex(BmpEndLine) next Response.Flush end sub %> <% '#Generate captcha if CodeType < 2 then secureCode = CreateGUID(CodeLength) else secureCode = FakeWord(CodeLength) end if Session(SessionName) = secureCode PrepareBitmap(secureCode) if (NoiseEffect > 0) and (NoiseEffect <> 3) then AddNoise() end if SendBitmap() %>