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244
includes/OWASP/PureCaptcha.php
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244
includes/OWASP/PureCaptcha.php
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<?php
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/**
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* OWASP PureCaptcha
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* Generates simple CAPTCHAs without requiring any third party library.
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* @version 1.1
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*/
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namespace OWASP;
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class PureCaptcha
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{
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protected $charWidth=6;
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protected $charHeight=13;
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protected $chars="2346789ABDHKLMNPRTWXYZ"; //do not modify!
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protected $ascii="eNrtW0FuwyAQ/NIANjbOa3LMG6r8vWrrSonkkt0xDWDvIcGXEYHM7O6s4b
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p4v3zcFlyuiwu/T/Hn4ba4h49fx7COwzqO3+P964tF+i0kViRWJLaQ4RGJF3PiETnQyFGzzidklC
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A31znlkMjt7Zzb2+y/kjQ79MwEbEH/+kOftsjxLHKehK7cbYT/qu0KNBcHmosjzcVI63yi1znTyE
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RHCAd6oZX479uL/yIuBho5SFgs5z8kc0YaOUm4iJfxXxVbEr23Djy0Dv+D1T/iXzvSyKjhop7/r+
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M/LP5v83+w+qdM/aOP/6LKqXr9r0Lm+Z+H1uH/aPGf87/Y7X8t/jfA/2j8b43/MP/7Pv5P7frfbH
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YPtKOszn8VcqIrxPrxXwetw/+5n/pfz395/Y8L2//HG+sf1ZwzjUw0Utf/byH+J+N/bf7L47/xv/
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z7L7QnAFG+7NgAgDYAnRngHgog50wAXAcU9BtgaBqDEz3nTK/zVALw/QiAbwHxFvg/X4G53QJwuw
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VgR4CCZYBc9wh0BpD3gKDuAVkJVE4Aw5EEgGICcF0JgG+C4vQCGI/QBTqWCT5cCSSDVhJANAH0Kw
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AzwfsFMB3xHBzEJliFLHwPoMY5OBEy0cj8OWi0mAFmM8G1D0LwHgC0CYbaBIvaBB1mgHRuAajOEB
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W+CcNnANGcM408UwnkYQLoTwBWApUTgN0F7vAuDNRdILsLvymA+ycgmwSd";
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function __construct()
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{
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$this->ascii=unserialize(gzuncompress(base64_decode(
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preg_replace('/\s+/', '', $this->ascii))));
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$this->text=$this->randomText();
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}
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/**
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* Contains the captcha text.
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* @var string
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*/
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public $text;
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/**
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* Generates random text for use in captcha
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* @param integer $length
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* @return string
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*/
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protected function randomText($length=5)
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{
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$res="";
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for ($i=0;$i<$length;++$i)
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$res.=$this->chars[mt_rand(0,strlen($this->chars)-1)];
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return $res;
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}
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/**
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* returns the index of a char in $chars array
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*/
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protected function asciiEntry($char)
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{
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for ($i=0;$i<strlen($this->chars);++$i)
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if ($this->chars[$i]==$char) return $i;
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return -1;
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}
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/**
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* converts a text to a bitmap
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* which is a 2D array of ones and zeroes denoting the text
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*/
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protected function textBitmap($text,$spacing=2)
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{
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$width=$this->charWidth;
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$height=$this->charHeight;
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$result=array();
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$baseY=$baseX=0;
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for ($index=0;$index<strlen($text);++$index)
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{
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for ($j=0;$j<$height;++$j)
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{
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for ($i=0;$i<$width;++$i)
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$result[$baseY+$j][$baseX+$i]=
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1-$this->ascii[$this->asciiEntry($text[$index])][$j][$i];
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for ($i=0;$i<$spacing;++$i)
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$result[$baseY+$j][$baseX+$width+$i]=0;
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}
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$baseX+=$width+$spacing;
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}
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return $result;
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}
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/**
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* displays a bitmap string on the browser screen
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*/
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protected function displayBitmap($bitmap)
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{
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header("Content-Type: image/bmp");
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echo $this->bitmap2bmp($bitmap);
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}
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protected function inlineBitmap($bitmap)
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{
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return base64_encode($this->bitmap2bmp($bitmap));
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}
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/**
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* generates a monochrome BMP file
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* a bitmap needs to be sent to this function
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* i.e a 2D array with every element being either 1 or 0
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* @param integer $width
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* @param integer $height
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* @param array $bitmap
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* @return string
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*/
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protected function bitmap2bmp($bitmap)
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{
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$width=count($bitmap[0]);
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$height=count($bitmap);
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$bytemap=$this->bitmap2bytemap($bitmap);
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$rowSize=floor(($width+31)/32)*4;
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$size=$rowSize*$height + 62; //62 metadata size
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#bitmap header
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$data= "BM"; //header
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$data.= (pack('V',$size)); //bitmap size ,4 bytes unsigned little endian
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$data.= "RRRR";
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$data.= (pack('V',14+40+8)); //bitmap data start offset ,
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//4 bytes unsigned little endian, 14 forced, 40 header, 8 colors
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#info header
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$data.= pack('V',40); //bitmap header size (min 40),
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//4 bytes unsigned little-endian
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$data.= (pack('V',$width)); //bitmap width , 4 bytes signed integer
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$data.= (pack('V',$height)); //bitmap height , 4 bytes signed integer
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$data.= (pack('v',1)); //number of colored plains , 2 bytes
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$data.= (pack('v',1)); //color depth , 2 bytes
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$data.= (pack('V',0)); //compression algorithm , 4 bytes (0=none, RGB)
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$data.= (pack('V',0)); //size of raw data, 0 is fine for no compression
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$data.= (pack('V',11808)); //horizontal resolution (dpi), 4 bytes
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$data.= (pack('V',11808)); //vertical resolution (dpi), 4 bytes
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$data.= (pack('V',0)); //number of colors in pallette (0 = all), 4 bytes
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$data.= (pack('V',0)); //number of important colors (0 = all), 4 bytes
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#color palette
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$data.= (pack('V',0x00FFFFFF)); //next color, white
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$data.= (pack('V',0)); //first color, black
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for ($j=$height-1;$j>=0;--$j)
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for ($i=0;$i<$rowSize/4;++$i)
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for ($k=0;$k<4;++$k)
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if (isset($bytemap[$j][$i*4+$k]))
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$data.= pack('C',$bytemap[$j][$i*4+$k]);
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else
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$data.= pack('C',0);
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return $data;
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}
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/**
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* Converts a bitmap to a bytemap, which is necessary for outputting it
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*
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*/
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protected function bitmap2bytemap($bitmap)
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{
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$width=count($bitmap[0]);
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$height=count($bitmap);
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$bytemap=array();
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for ($j=0;$j<$height;++$j)
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{
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for ($i=0;$i<$width/8;++$i)
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{
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$bitstring="";
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for ($k=0;$k<8;++$k)
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if (isset($bitmap[$j][$i*8+$k]))
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$bitstring.=$bitmap[$j][$i*8+$k];
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else
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$bitstring.="0";
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$bytemap[$j][]=bindec($bitstring);
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}
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}
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return $bytemap;
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}
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/**
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* rotates a bitmap, returning new dimensions with the bitmap
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* return bitmap
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*/
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protected function rotateBitmap($bitmap, $degree)
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{
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$c=cos(deg2rad($degree));
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$s=sin(deg2rad($degree));
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$width=count($bitmap[0]);
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$height=count($bitmap);
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$newHeight=round(abs($width*$s)+abs($height*$c));
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$newWidth=round(abs($width*$c) + abs($height*$s))+1;
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$x0 = $width/2 - $c*$newWidth/2 - $s*$newHeight/2;
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$y0 = $height/2 - $c*$newHeight/2 + $s*$newWidth/2;
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$result=array_fill(0, $newHeight, array_fill(0, $newWidth, 0));
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for ($j=0;$j<$newHeight;++$j)
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for ($i=1;$i<$newWidth;++$i)
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{
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$y=(int)(-$s*$i+$c*$j+$y0);
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$x=(int)($c*$i+$s*$j+$x0);
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if (isset($bitmap[$y][$x]))
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$result[$j][$i]=$bitmap[$y][$x];
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}
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return $result;
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}
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/**
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* scales a bitmap to be bigger
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*/
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protected function scaleBitmap($bitmap,$scaleX,$scaleY)
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{
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$width=count($bitmap[0]);
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$height=count($bitmap);
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$newHeight=$height*$scaleY;
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$newWidth=$width*$scaleX;
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$result=array_fill(0, $newHeight, array_fill(0, $newWidth, 0));
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for ($j=0;$j<$newHeight;++$j)
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for ($i=0;$i<$newWidth;++$i)
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$result[$j][$i]=$bitmap[(int)($j/$scaleY)]
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[(int)($i/$scaleX)];
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return $result;
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}
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/**
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* adds random noise to the captcha
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*/
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protected function distort($bitmap,$noisePercent=5)
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{
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for ($j=0;$j<count($bitmap);++$j)
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for ($i=0;$i<count($bitmap[0]);++$i)
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if (isset($bitmap[$j][$i]) && mt_rand()%100<$noisePercent)
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$bitmap[$j][$i]=1;
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return $bitmap;
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}
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/**
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* draw a captcha to the screen, returning its value
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*/
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public function show($distort=true,$scale=2.3)
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{
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$bitmap=$this->textBitmap($this->text);
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$degree=mt_rand(2,4);
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if (mt_rand()%100<50)
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$degree=-$degree;
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$bitmap=$this->rotateBitmap($bitmap,$degree);
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$bitmap=$this->scaleBitmap($bitmap,$scale,$scale);
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if ($distort) $bitmap=$this->distort($bitmap);
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return $this->inlineBitmap($bitmap);
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}
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}
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