PHP程序的AES加密解密算法

    <?php      
    //--------第一种AES-CBC加密方案--------      
    //仅为理解之用      
    $cipher = mcrypt_module_open(MCRYPT_RIJNDAEL_128, "", MCRYPT_MODE_CBC, ""); #128位 = 16字节 iv必须16字节      
    $key128 = "1234567890123456";      
    $iv =  "1234567890123456";      
    $cleartext = "hello"; #待加密的字符串      
    if (mcrypt_generic_init($cipher, $key128, $iv) != -1)      
    {      
        // PHP pads with NULL bytes if $cleartext is not a multiple of the block size..      
        //如果$cleartext不是128位也就是16字节的倍数，补充NULL字符满足这个条件，返回的结果的长度一样      
        $cipherText = mcrypt_generic($cipher,$cleartext );      
        mcrypt_generic_deinit($cipher);      
              
        // Display the result in hex.      
        //很明显，结果也是16字节的倍数.1个字节用两位16进制表示，所以下面输出的是32的倍数位16进制的字符串       
        echo "第一种AES加密方案:<br>";      
        printf("128-bit encrypted result:
%s

",bin2hex($cipherText));      
        echo "<br>";echo "<br>";      
    }      
    //--------第一种AES加密方案--------      
    ?>     
    </pre>    
    转载来源：http://www.chilkatsoft.com/p/php_aes.asp    
        
    http://www.cnblogs.com/adylee/archive/2007/09/14/893438.html    
        
    转载来源：http://blog.csdn.net/shushengsky/archive/2009/12/13/4961861.aspx    
    <pre lang="php">    
    <?php      
    //--------第二种AES-ECB加密方案--------      
    //加密      
    echo "第二种AES加密方案:<br>";      
    $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:
%s

",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;       
    }      
    //--------第二种AES加密方案--------      
    </pre>    
    <pre lang="php">    
    <?php      
    //--------第三种AES-ECB加密方案--------      
    echo "第三种AES加密方案:<br>";      
    $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);      
    //--------第三种AES加密方案--------      
    ?>    
        
    #KEY长度无限制，IV长度必须是block_size的倍数    
    #如果是MCRYPT_MODE_ECB加密，结果与KEY有关，与IV无关    
    #如果是MCRYPT_MODE_CBC加密，结果与KEY有关，与IV有关    

1. //--------第四种AES加密/解密方案 CBC模式,128-bit--------  

/* * 实现AES加密 * $str : 要加密的字符串 * $keys : 加密密钥 * $iv : 加密向量 * $cipher_alg : 加密方式 */ function ecryptdString($str,$keys="6461772803150152",$iv="8105547186756005",$cipher_alg=MCRYPT_RIJNDAEL_128){ $encrypted_string= bin2hex(mcrypt_encrypt($cipher_alg,$keys, $str, MCRYPT_MODE_CBC,$iv)); return$encrypted_string; } /* * 实现AES解密 * $str : 要解密的字符串 * $keys : 加密密钥 * $iv : 加密向量 * $cipher_alg : 加密方式 */ functiondecryptStrin($str,$keys="6461772803150152",$iv="8105547186756005",$cipher_alg=MCRYPT_RIJNDAEL_128){ $decrypted_string= mcrypt_decrypt($cipher_alg,$keys, pack("H*",$str),MCRYPT_MODE_CBC,$iv); return$decrypted_string; }