Php aes encryption class-PHP source code

Php aes encryption class

1. Aes. php

  6 && $i%$Nk == 4) {        $temp = self::subWord($temp);      }      for ($t=0; $t<4; $t++) $w[$i][$t] = $w[$i-$Nk][$t] ^ $temp[$t];    }    return $w;  }     private static function subWord($w) {    // apply SBox to 4-byte word w    for ($i=0; $i<4; $i++) $w[$i] = self::$sBox[$w[$i]];    return $w;  }     private static function rotWord($w) {    // rotate 4-byte word w left by one byte    $tmp = $w[0];    for ($i=0; $i<3; $i++) $w[$i] = $w[$i+1];    $w[3] = $tmp;    return $w;  }     // sBox is pre-computed multiplicative inverse in GF(2^8) used in subBytes and keyExpansion [§5.1.1]  private static $sBox = array(    0x63,0x7c,0x77,0x7b,0xf2,0x6b,0x6f,0xc5,0x30,0x01,0x67,0x2b,0xfe,0xd7,0xab,0x76,    0xca,0x82,0xc9,0x7d,0xfa,0x59,0x47,0xf0,0xad,0xd4,0xa2,0xaf,0x9c,0xa4,0x72,0xc0,    0xb7,0xfd,0x93,0x26,0x36,0x3f,0xf7,0xcc,0x34,0xa5,0xe5,0xf1,0x71,0xd8,0x31,0x15,    0x04,0xc7,0x23,0xc3,0x18,0x96,0x05,0x9a,0x07,0x12,0x80,0xe2,0xeb,0x27,0xb2,0x75,    0x09,0x83,0x2c,0x1a,0x1b,0x6e,0x5a,0xa0,0x52,0x3b,0xd6,0xb3,0x29,0xe3,0x2f,0x84,    0x53,0xd1,0x00,0xed,0x20,0xfc,0xb1,0x5b,0x6a,0xcb,0xbe,0x39,0x4a,0x4c,0x58,0xcf,    0xd0,0xef,0xaa,0xfb,0x43,0x4d,0x33,0x85,0x45,0xf9,0x02,0x7f,0x50,0x3c,0x9f,0xa8,    0x51,0xa3,0x40,0x8f,0x92,0x9d,0x38,0xf5,0xbc,0xb6,0xda,0x21,0x10,0xff,0xf3,0xd2,    0xcd,0x0c,0x13,0xec,0x5f,0x97,0x44,0x17,0xc4,0xa7,0x7e,0x3d,0x64,0x5d,0x19,0x73,    0x60,0x81,0x4f,0xdc,0x22,0x2a,0x90,0x88,0x46,0xee,0xb8,0x14,0xde,0x5e,0x0b,0xdb,    0xe0,0x32,0x3a,0x0a,0x49,0x06,0x24,0x5c,0xc2,0xd3,0xac,0x62,0x91,0x95,0xe4,0x79,    0xe7,0xc8,0x37,0x6d,0x8d,0xd5,0x4e,0xa9,0x6c,0x56,0xf4,0xea,0x65,0x7a,0xae,0x08,    0xba,0x78,0x25,0x2e,0x1c,0xa6,0xb4,0xc6,0xe8,0xdd,0x74,0x1f,0x4b,0xbd,0x8b,0x8a,    0x70,0x3e,0xb5,0x66,0x48,0x03,0xf6,0x0e,0x61,0x35,0x57,0xb9,0x86,0xc1,0x1d,0x9e,    0xe1,0xf8,0x98,0x11,0x69,0xd9,0x8e,0x94,0x9b,0x1e,0x87,0xe9,0xce,0x55,0x28,0xdf,    0x8c,0xa1,0x89,0x0d,0xbf,0xe6,0x42,0x68,0x41,0x99,0x2d,0x0f,0xb0,0x54,0xbb,0x16);     // rCon is Round Constant used for the Key Expansion [1st col is 2^(r-1) in GF(2^8)] [§5.2]  private static $rCon = array(     array(0x00, 0x00, 0x00, 0x00),    array(0x01, 0x00, 0x00, 0x00),    array(0x02, 0x00, 0x00, 0x00),    array(0x04, 0x00, 0x00, 0x00),    array(0x08, 0x00, 0x00, 0x00),    array(0x10, 0x00, 0x00, 0x00),    array(0x20, 0x00, 0x00, 0x00),    array(0x40, 0x00, 0x00, 0x00),    array(0x80, 0x00, 0x00, 0x00),    array(0x1b, 0x00, 0x00, 0x00),    array(0x36, 0x00, 0x00, 0x00) );  }   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  */?> 
 >> operator nor unsigned ints   *   * @param a  number to be shifted (32-bit integer)   * @param b  number of bits to shift a to the right (0..31)   * @return   a right-shifted and zero-filled by b bits   */  private static function urs($a, $b) {    $a &= 0xffffffff; $b &= 0x1f;  // (bounds check)    if ($a&0x80000000 && $b>0) {   // if left-most bit set      $a = ($a>>1) & 0x7fffffff;   //   right-shift one bit & clear left-most bit      $a = $a >> ($b-1);           //   remaining right-shifts    } else {                       // otherwise      $a = ($a>>$b);               //   use normal right-shift    }     return $a;   } }  /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  */?>

Php code

The following Test Harness illustrates server-side encryption and decryption using the PHP AES script.It provides fields to enter the password and plaintext message, and then invokes itself to encrypt the plaintext and/or decrypt the ciphertext. 
    
 AES in PHP test harness

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 The following Test Harness illustrates a possible way of integrating JavaScript encoding with PHP decoding. The HTML file presents fields to enter the plaintext message. It uses the JavaScript version to encrypt the message client-side, and invokes the PHP file passing the ciphertext in the POST array. The PHP script then uses the PHP version to decrypt the ciphertext passed in the POST array and display it.Of course, any real application would use a more sophisticated approach to password management! aes-js-php.html:
 AES JavaScript+PHP test harness (client-side encrypt)