PHP AES加密学习笔记
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<?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:\n%s\n\n",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.asphttp://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($cipher); // Display the result in hex. printf("128-bit encrypted result:\n%s\n\n",bin2hex($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??
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