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<?php |
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|
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namespace PhpOffice\PhpSpreadsheet\Reader\Xls; |
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|
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class MD5 |
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{ |
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// Context |
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private $a; |
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|
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private $b; |
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|
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private $c; |
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|
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private $d; |
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|
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/** |
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* MD5 stream constructor. |
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*/ |
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public function __construct() |
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{ |
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$this->reset(); |
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} |
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|
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/** |
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* Reset the MD5 stream context. |
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*/ |
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public function reset() |
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{ |
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$this->a = 0x67452301; |
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$this->b = 0xEFCDAB89; |
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$this->c = 0x98BADCFE; |
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$this->d = 0x10325476; |
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} |
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|
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/** |
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* Get MD5 stream context. |
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* |
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* @return string |
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*/ |
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public function getContext() |
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{ |
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$s = ''; |
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foreach (['a', 'b', 'c', 'd'] as $i) { |
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$v = $this->{$i}; |
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$s .= chr($v & 0xff); |
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$s .= chr(($v >> 8) & 0xff); |
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$s .= chr(($v >> 16) & 0xff); |
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$s .= chr(($v >> 24) & 0xff); |
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} |
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|
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return $s; |
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} |
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|
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/** |
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* Add data to context. |
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* |
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* @param string $data Data to add |
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*/ |
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public function add($data) |
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{ |
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$words = array_values(unpack('V16', $data)); |
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|
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$A = $this->a; |
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$B = $this->b; |
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$C = $this->c; |
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$D = $this->d; |
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|
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$F = ['self', 'f']; |
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$G = ['self', 'g']; |
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$H = ['self', 'h']; |
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$I = ['self', 'i']; |
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|
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// ROUND 1 |
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self::step($F, $A, $B, $C, $D, $words[0], 7, 0xd76aa478); |
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self::step($F, $D, $A, $B, $C, $words[1], 12, 0xe8c7b756); |
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self::step($F, $C, $D, $A, $B, $words[2], 17, 0x242070db); |
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self::step($F, $B, $C, $D, $A, $words[3], 22, 0xc1bdceee); |
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self::step($F, $A, $B, $C, $D, $words[4], 7, 0xf57c0faf); |
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self::step($F, $D, $A, $B, $C, $words[5], 12, 0x4787c62a); |
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self::step($F, $C, $D, $A, $B, $words[6], 17, 0xa8304613); |
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self::step($F, $B, $C, $D, $A, $words[7], 22, 0xfd469501); |
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self::step($F, $A, $B, $C, $D, $words[8], 7, 0x698098d8); |
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self::step($F, $D, $A, $B, $C, $words[9], 12, 0x8b44f7af); |
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self::step($F, $C, $D, $A, $B, $words[10], 17, 0xffff5bb1); |
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self::step($F, $B, $C, $D, $A, $words[11], 22, 0x895cd7be); |
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self::step($F, $A, $B, $C, $D, $words[12], 7, 0x6b901122); |
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self::step($F, $D, $A, $B, $C, $words[13], 12, 0xfd987193); |
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self::step($F, $C, $D, $A, $B, $words[14], 17, 0xa679438e); |
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self::step($F, $B, $C, $D, $A, $words[15], 22, 0x49b40821); |
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|
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// ROUND 2 |
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self::step($G, $A, $B, $C, $D, $words[1], 5, 0xf61e2562); |
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self::step($G, $D, $A, $B, $C, $words[6], 9, 0xc040b340); |
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self::step($G, $C, $D, $A, $B, $words[11], 14, 0x265e5a51); |
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self::step($G, $B, $C, $D, $A, $words[0], 20, 0xe9b6c7aa); |
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self::step($G, $A, $B, $C, $D, $words[5], 5, 0xd62f105d); |
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self::step($G, $D, $A, $B, $C, $words[10], 9, 0x02441453); |
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self::step($G, $C, $D, $A, $B, $words[15], 14, 0xd8a1e681); |
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self::step($G, $B, $C, $D, $A, $words[4], 20, 0xe7d3fbc8); |
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self::step($G, $A, $B, $C, $D, $words[9], 5, 0x21e1cde6); |
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self::step($G, $D, $A, $B, $C, $words[14], 9, 0xc33707d6); |
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self::step($G, $C, $D, $A, $B, $words[3], 14, 0xf4d50d87); |
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self::step($G, $B, $C, $D, $A, $words[8], 20, 0x455a14ed); |
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self::step($G, $A, $B, $C, $D, $words[13], 5, 0xa9e3e905); |
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self::step($G, $D, $A, $B, $C, $words[2], 9, 0xfcefa3f8); |
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self::step($G, $C, $D, $A, $B, $words[7], 14, 0x676f02d9); |
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self::step($G, $B, $C, $D, $A, $words[12], 20, 0x8d2a4c8a); |
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|
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// ROUND 3 |
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self::step($H, $A, $B, $C, $D, $words[5], 4, 0xfffa3942); |
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self::step($H, $D, $A, $B, $C, $words[8], 11, 0x8771f681); |
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self::step($H, $C, $D, $A, $B, $words[11], 16, 0x6d9d6122); |
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self::step($H, $B, $C, $D, $A, $words[14], 23, 0xfde5380c); |
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self::step($H, $A, $B, $C, $D, $words[1], 4, 0xa4beea44); |
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self::step($H, $D, $A, $B, $C, $words[4], 11, 0x4bdecfa9); |
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self::step($H, $C, $D, $A, $B, $words[7], 16, 0xf6bb4b60); |
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self::step($H, $B, $C, $D, $A, $words[10], 23, 0xbebfbc70); |
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self::step($H, $A, $B, $C, $D, $words[13], 4, 0x289b7ec6); |
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self::step($H, $D, $A, $B, $C, $words[0], 11, 0xeaa127fa); |
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self::step($H, $C, $D, $A, $B, $words[3], 16, 0xd4ef3085); |
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self::step($H, $B, $C, $D, $A, $words[6], 23, 0x04881d05); |
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self::step($H, $A, $B, $C, $D, $words[9], 4, 0xd9d4d039); |
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self::step($H, $D, $A, $B, $C, $words[12], 11, 0xe6db99e5); |
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self::step($H, $C, $D, $A, $B, $words[15], 16, 0x1fa27cf8); |
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self::step($H, $B, $C, $D, $A, $words[2], 23, 0xc4ac5665); |
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|
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// ROUND 4 |
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self::step($I, $A, $B, $C, $D, $words[0], 6, 0xf4292244); |
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self::step($I, $D, $A, $B, $C, $words[7], 10, 0x432aff97); |
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self::step($I, $C, $D, $A, $B, $words[14], 15, 0xab9423a7); |
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self::step($I, $B, $C, $D, $A, $words[5], 21, 0xfc93a039); |
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self::step($I, $A, $B, $C, $D, $words[12], 6, 0x655b59c3); |
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self::step($I, $D, $A, $B, $C, $words[3], 10, 0x8f0ccc92); |
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self::step($I, $C, $D, $A, $B, $words[10], 15, 0xffeff47d); |
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self::step($I, $B, $C, $D, $A, $words[1], 21, 0x85845dd1); |
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self::step($I, $A, $B, $C, $D, $words[8], 6, 0x6fa87e4f); |
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self::step($I, $D, $A, $B, $C, $words[15], 10, 0xfe2ce6e0); |
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self::step($I, $C, $D, $A, $B, $words[6], 15, 0xa3014314); |
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self::step($I, $B, $C, $D, $A, $words[13], 21, 0x4e0811a1); |
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self::step($I, $A, $B, $C, $D, $words[4], 6, 0xf7537e82); |
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self::step($I, $D, $A, $B, $C, $words[11], 10, 0xbd3af235); |
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self::step($I, $C, $D, $A, $B, $words[2], 15, 0x2ad7d2bb); |
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self::step($I, $B, $C, $D, $A, $words[9], 21, 0xeb86d391); |
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|
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$this->a = ($this->a + $A) & 0xffffffff; |
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$this->b = ($this->b + $B) & 0xffffffff; |
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$this->c = ($this->c + $C) & 0xffffffff; |
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$this->d = ($this->d + $D) & 0xffffffff; |
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} |
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|
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private static function f($X, $Y, $Z) |
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{ |
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return ($X & $Y) | ((~$X) & $Z); // X AND Y OR NOT X AND Z |
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} |
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|
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private static function g($X, $Y, $Z) |
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{ |
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return ($X & $Z) | ($Y & (~$Z)); // X AND Z OR Y AND NOT Z |
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} |
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|
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private static function h($X, $Y, $Z) |
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{ |
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return $X ^ $Y ^ $Z; // X XOR Y XOR Z |
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} |
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|
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private static function i($X, $Y, $Z) |
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{ |
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return $Y ^ ($X | (~$Z)); // Y XOR (X OR NOT Z) |
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} |
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|
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private static function step($func, &$A, $B, $C, $D, $M, $s, $t) |
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{ |
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$A = ($A + call_user_func($func, $B, $C, $D) + $M + $t) & 0xffffffff; |
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$A = self::rotate($A, $s); |
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$A = ($B + $A) & 0xffffffff; |
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} |
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|
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private static function rotate($decimal, $bits) |
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{ |
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$binary = str_pad(decbin($decimal), 32, '0', STR_PAD_LEFT); |
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|
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return bindec(substr($binary, $bits) . substr($binary, 0, $bits)); |
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} |
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} |
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|
