PHP实现AES256加密算法实例

本文实例讲述了PHP实现AES256加密算法的方法，是较为常见的一种加密算法。分享给大家供大家参考。具体如下：

aes.class.php文件如下：

 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) );  
}  
?>

aesctr.class.php文件如下：

>> 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;  
 } 
}  
?>

Demo实例程序如下：

'; 
 
$mstr = AesCtr::encrypt('Hello World', 'key', 256); 
echo "Encrypt String : $mstr
"; 
 
$dstr = AesCtr::decrypt($mstr, 'key', 256); 
echo "Decrypt String : $dstr
"; 
 
echo 'each not change
'; 
 
$mstr = AesCtr::encrypt('Hello World', 'key', 256, 1); // keep=1 
echo "Encrypt String : $mstr
"; 
 
$dstr = AesCtr::decrypt($mstr, 'key', 256); 
echo "Decrypt String : $dstr
"; 
?> 

这里再介绍另一使用 PHP mcrypt 加解密方法：

/* aes 256 encrypt 
* @param String $ostr 
* @param String $securekey 
* @param String $type encrypt, decrypt 
*/ 
function aes($ostr, $securekey, $type='encrypt'){ 
  if($ostr==''){ 
    return ''; 
  } 
   
  $key = $securekey; 
  $iv = strrev($securekey); 
  $td = mcrypt_module_open('rijndael-256', '', 'ofb', ''); 
  mcrypt_generic_init($td, $key, $iv); 
 
  $str = ''; 
 
  switch($type){ 
    case 'encrypt': 
      $str = base64_encode(mcrypt_generic($td, $ostr)); 
      break; 
 
    case 'decrypt': 
      $str = mdecrypt_generic($td, base64_decode($ostr)); 
      break; 
  } 
 
  mcrypt_generic_deinit($td); 
 
  return $str; 
} 
 
// Demo 
$key = "fdipzone201314showmethemoney!@#$"; 
$str = "show me the money"; 
 
$ostr = aes($str, $key); 
echo "String 1: $ostr
"; 
 
$dstr = aes($ostr, $key, 'decrypt'); 
echo "String 2: $dstr
";

希望本文所述对大家php程序设计的学习有所帮助。