如何在PHP中使用AES加密算法加密数据

算法/模式/填充        16字节加密后数据长度    不满16字节加密后长度
AES/CBC/NoPadding       16             不支持
AES/CBC/PKCS5Padding     32             16
AES/CBC/ISO10126Padding    32             16
AES/CFB/NoPadding       16             原始数据长度
AES/CFB/PKCS5Padding     32             16
AES/CFB/ISO10126Padding    32             16
AES/ECB/NoPadding       16             不支持
AES/ECB/PKCS5Padding     32             16
AES/ECB/ISO10126Padding    32             16
AES/OFB/NoPadding       16             原始数据长度
AES/OFB/PKCS5Padding     32             16
AES/OFB/ISO10126Padding    32             16
AES/PCBC/NoPadding      16             不支持
AES/PCBC/PKCS5Padding     32             16
AES/PCBC/ISO10126Padding   32             16

<?php
$privateKey = "1234567812345678";
$iv 	= "1234567812345678";
$data 	= "Test String";

//加密
$encrypted = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $privateKey, $data, MCRYPT_MODE_CBC, $iv);
echo(base64_encode($encrypted));
echo '<br/>';

//解密
$encryptedData = base64_decode("2fbwW9+8vPId2/foafZq6Q==");
$decrypted = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $privateKey, $encryptedData, MCRYPT_MODE_CBC, $iv);
echo($decrypted);
?>

<?php 
//加密  
$key = '1234567890123456';  
$content = 'hello';  
$padkey = pad2Length($key,16);  
$cipher = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_ECB, '');  
$iv_size = mcrypt_enc_get_iv_size($cipher);  
$iv = mcrypt_create_iv($iv_size, MCRYPT_RAND); #IV自动生成？  
echo '自动生成iv的长度:'.strlen($iv).'位:'.bin2hex($iv).'<br>';  
if (mcrypt_generic_init($cipher, pad2Length($key,16), $iv) != -1)  
{  
  // PHP pads with NULL bytes if $content is not a multiple of the block size..  
  $cipherText = mcrypt_generic($cipher,pad2Length($content,16) );  
  mcrypt_generic_deinit($cipher);  
  mcrypt_module_close($cipher);  
    
  // Display the result in hex.  
  printf("128-bit encrypted result:n%snn",bin2hex($cipherText));  
  print("<br />");  
    
}  
//解密  
$mw = bin2hex($cipherText);  
$td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_ECB, '');  
if (mcrypt_generic_init($td, $padkey, $iv) != -1)  
{  
  $p_t = mdecrypt_generic($td, hexToStr($mw));  
  mcrypt_generic_deinit($td);  
  mcrypt_module_close($td);  
    
  $p_t = trimEnd($p_t);  
  echo '解密:';  
  print($p_t);  
  print("<br />");  
  print(bin2hex($p_t));  
  echo '<br><br>';  
}  
//将$text补足$padlen倍数的长度  
function pad2Length($text, $padlen){  
  $len = strlen($text)%$padlen;  
  $res = $text;  
  $span = $padlen-$len;  
  for($i=0; $i<$span; $i++){  
    $res .= chr($span);  
  }  
  return $res;  
}  
//将解密后多余的长度去掉(因为在加密的时候 补充长度满足block_size的长度)  
function trimEnd($text){  
  $len = strlen($text);  
  $c = $text[$len-1];  
  if(ord($c) <$len){  
    for($i=$len-ord($c); $i<$len; $i++){  
      if($text[$i] != $c){  
        return $text;  
      }  
    }  
    return substr($text, 0, $len-ord($c));  
  }  
  return $text;  
}  
//16进制的转为2进制字符串  
function hexToStr($hex)   
{   
  $bin="";   
  for($i=0; $i<strlen($hex)-1; $i+=2)   
  {  
    $bin.=chr(hexdec($hex[$i].$hex[$i+1]));   
  }  
  return $bin;   
}

<?php    
$key = '1234567890123456';  
$key = pad2Length($key,16);  
$iv = 'asdff';  
$content = 'hello';  
$content = pad2Length($content,16);  
$AESed = bin2hex( mcrypt_encrypt(MCRYPT_RIJNDAEL_128,$key,$content,MCRYPT_MODE_ECB,$iv) ); #加密  
echo "128-bit encrypted result:".$AESed.'<br>';  
$jiemi = mcrypt_decrypt(MCRYPT_RIJNDAEL_128,$key,hexToStr($AESed),MCRYPT_MODE_ECB,$iv); #解密  
echo '解密:';  
echo trimEnd($jiemi);   
?>