在PHP中使用AES加密算法加密数据

在研究Discuz 的时候，发现Discuz有一套相当完美的加密算法(相对而言)。这个算法可以将数据加密后，储存起来，到需要用的时候，用之前加密的秘钥将之还原。 除了这个之外，还有AES这个算法能够将数据很好的加密起来，在传输过程中不容易被破解。 在PHP中，我

在研究Discuz 的时候，发现Discuz有一套相当完美的加密算法(相对而言)。这个算法可以将数据加密后，储存起来，到需要用的时候，用之前加密的秘钥将之还原。

    除了这个之外，还有AES这个算法能够将数据很好的加密起来，在传输过程中不容易被破解。

    在PHP中，我们必须先安装好mcrypt这个模块，并且添加相应版本的扩展到php中，详情可以看 不重新编译PHP安装Mcrypt扩展

AES加密模式和填充方式有以下之中，但不是全部

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

下面就是在PHP中使用AES对数据加密

 AES-CBC 加密方案

<code><span><span><?php <span>$privateKey <span>= <span>"1234567812345678"<span>;
<span>$iv 	<span>= <span>"1234567812345678"<span>;
<span>$data 	<span>= <span>"Test String"<span>;
<span>
//加密
<span>$encrypted <span>= <span>mcrypt_encrypt<span>(<span>MCRYPT_RIJNDAEL_128<span>, <span>$privateKey<span>, <span>$data<span>, <span>MCRYPT_MODE_CBC<span>, <span>$iv<span>)<span>;
<span>echo<span>(<span>base64_encode<span>(<span>$encrypted<span>)<span>)<span>;
<span>echo '<span><span><span><span><br>/>'<span>;
<span>
//解密
<span>$encryptedData <span>= <span>base64_decode<span>(<span>"2fbwW9+8vPId2/foafZq6Q=="<span>)<span>;
<span>$decrypted <span>= <span>mcrypt_decrypt<span>(<span>MCRYPT_RIJNDAEL_128<span>, <span>$privateKey<span>, <span>$encryptedData<span>, <span>MCRYPT_MODE_CBC<span>, <span>$iv<span>)<span>;
<span>echo<span>(<span>$decrypted<span>)<span>;
<span>?></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></code>

AES-ECB加密方案 

<code><span><?php <span>
//加密    
<span>$key <span>= <span>'1234567890123456'<span>;    
<span>$content <span>= <span>'hello'<span>;    
<span>$padkey <span>= <span>pad2Length<span>(<span>$key<span>,<span>16<span>)<span>;    
<span>$cipher <span>= <span>mcrypt_module_open<span>(<span>MCRYPT_RIJNDAEL_128<span>, <span>''<span>, <span>MCRYPT_MODE_ECB<span>, <span>''<span>)<span>;    
<span>$iv_size <span>= <span>mcrypt_enc_get_iv_size<span>(<span>$cipher<span>)<span>;    
<span>$iv <span>= <span>mcrypt_create_iv<span>(<span>$iv_size<span>, <span>MCRYPT_RAND<span>)<span>;<span> #IV自动生成？    
<span>echo <span>'自动生成iv的长度:'<span>.<span>strlen<span>(<span>$iv<span>)<span>.<span>'位:'<span>.<span>bin2hex<span>(<span>$iv<span>)<span>.'<span><span><span><span><br>>'<span>;    
<span>if <span>(<span>mcrypt_generic_init<span>(<span>$cipher<span>, <span>pad2Length<span>(<span>$key<span>,<span>16<span>)<span>, <span>$iv<span>) <span>!<span>= <span>-<span>1<span>)    
<span>{    
   <span> // PHP pads with NULL bytes if $content is not a multiple of the block size..    
    <span>$cipherText <span>= <span>mcrypt_generic<span>(<span>$cipher<span>,<span>pad2Length<span>(<span>$content<span>,<span>16<span>) <span>)<span>;    
    <span>mcrypt_generic_deinit<span>(<span>$cipher<span>)<span>;    
    <span>mcrypt_module_close<span>(<span>$cipher<span>)<span>;    
       
   <span> // Display the result in hex.    
    <span>printf<span>(<span>"128-bit encrypted result:n%snn"<span>,<span>bin2hex<span>(<span>$cipherText<span>)<span>)<span>;    
    <span>print<span>("<span><span><span><span><br>/>"<span>)<span>;    
       
<span>}    <span>
//解密    
<span>$mw <span>= <span>bin2hex<span>(<span>$cipherText<span>)<span>;    
<span>$td <span>= <span>mcrypt_module_open<span>(<span>MCRYPT_RIJNDAEL_128<span>, <span>''<span>, <span>MCRYPT_MODE_ECB<span>, <span>''<span>)<span>;    
<span>if <span>(<span>mcrypt_generic_init<span>(<span>$td<span>, <span>$padkey<span>, <span>$iv<span>) <span>!<span>= <span>-<span>1<span>)    
<span>{    
    <span>$p_t <span>= <span>mdecrypt_generic<span>(<span>$td<span>, <span>hexToStr<span>(<span>$mw<span>)<span>)<span>;    
    <span>mcrypt_generic_deinit<span>(<span>$td<span>)<span>;    
    <span>mcrypt_module_close<span>(<span>$td<span>)<span>;    
       
    <span>$p_t <span>= <span>trimEnd<span>(<span>$p_t<span>)<span>;    
    <span>echo <span>'解密:'<span>;    
    <span>print<span>(<span>$p_t<span>)<span>;    
    <span>print<span>("<span><span><span><span><br>/>"<span>)<span>;    
    <span>print<span>(<span>bin2hex<span>(<span>$p_t<span>)<span>)<span>;    
    <span>echo '<span><span><span><span><br>><span><span><span><span><br>>'<span>;    
<span>}    <span>
//将$text补足$padlen倍数的长度    
<span>function <span>pad2Length<span>(<span>$text<span>, <span>$padlen<span>)<span>{    
    <span>$len <span>= <span>strlen<span>(<span>$text<span>)<span>%<span>$padlen<span>;    
    </span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></code>