PHP symmetric encryption Algorithm (DES/AES) class code

/** * Common symmetric encryption algorithm classes * Support key: 64/128/256 bit (byte length 8/16/32) * Support algorithm: Des/aes (based on key length automatic matching using: Des:64bit aes:128/256bit) * Support mode: CBC/ECB/OFB/CFB * Ciphertext Code: Base64 string/16 binary string/binary string stream * Fill mode: pkcs5padding (DES) * * @author: Linvo * @version: 1.0.0 * @date: 2013/1/10 */ Class xcrypt{ Private $mcrypt; Private $key; Private $mode; Private $iv; Private $blocksize; /** * Constructor function * * @param string key * @param string mode * @param string vector ("off": Not used/"Auto": Auto/Other: Specify value, length with key) */ Public function __construct ($key, $mode = ' CBC ', $iv = "Off") { Switch (strlen ($key)) { Case 8: $this->mcrypt = mcrypt_des; Break Case 16: $this->mcrypt = mcrypt_rijndael_128; Break Case 32: $this->mcrypt = mcrypt_rijndael_256; Break Default Die ("Key size must is 8/16/32"); } $this->key = $key; Switch (Strtolower ($mode)) { Case ' OFB ': $this->mode = MCRYPT_MODE_OFB; if ($iv = = ' off ') die (' OFB must give a IV '); OFB must have a vector Break Case ' CFB ': $this->mode = MCRYPT_MODE_CFB; if ($iv = = ' off ') die (' CFB must give a IV '); The CFB must have a vector Break Case ' ECB ': $this->mode = MCRYPT_MODE_ECB; $iv = ' off '; The ECB does not need vectors Break Case ' CBC ': Default $this->mode = MCRYPT_MODE_CBC; } Switch (Strtolower ($IV)) { Case "Off": $this->iv = null; Break Case "Auto": $source = php_os== ' WINNT '? Mcrypt_rand:mcrypt_dev_random; $this->iv = Mcrypt_create_iv (Mcrypt_get_block_size ($this->mcrypt, $this->mode), $source); Break Default $this->iv = $iv; } } /** * Get vector values * @param string vector value encoding (base64/hex/bin) * @return String vector value */ Public Function Getiv ($code = ' base64 ') { Switch ($code) { Case ' base64 ': $ret = Base64_encode ($this->iv); Break Case ' hex ': $ret = Bin2Hex ($this->iv); Break Case ' bin ': Default $ret = $this->iv; } return $ret; } /** * Encryption * @param string plaintext * @param string cipher encoding (Base64/hex/bin) * @return String cipher */ Public function Encrypt ($str, $code = ' base64 ') { if ($this->mcrypt = = mcrypt_des) $str = $this->_pkcs5pad ($STR); if (Isset ($this->iv)) { $result = Mcrypt_encrypt ($this->mcrypt, $this->key, $str, $this->mode, $this->iv); } else { @ $result = Mcrypt_encrypt ($this->mcrypt, $this->key, $str, $this->mode); } Switch ($code) { Case ' base64 ': $ret = Base64_encode ($result); Break Case ' hex ': $ret = Bin2Hex ($result); Break Case ' bin ': Default $ret = $result; } return $ret; } /** * Decryption * @param string cipher * @param string cipher encoding (Base64/hex/bin) * @return String plaintext */ Public function Decrypt ($str, $code = "base64") { $ret = false; Switch ($code) { Case ' base64 ': $str = Base64_decode ($STR); Break Case ' hex ': $str = $this->_hex2bin ($STR); Break Case ' bin ': Default } if ($str!== false) { if (Isset ($this->iv)) { $ret = Mcrypt_decrypt ($this->mcrypt, $this->key, $str, $this->mode, $this->iv); } else { @ $ret = Mcrypt_decrypt ($this->mcrypt, $this->key, $str, $this->mode); } if ($this->mcrypt = = mcrypt_des) $ret = $this->_pkcs5unpad ($ret); } return $ret; } Private Function _pkcs5pad ($text) { $this->blocksize = mcrypt_get_block_size ($this->mcrypt, $this->mode); $pad = $this->blocksize-(strlen ($text)% $this->blocksize); Return $text. Str_repeat (Chr ($pad), $pad); } Private Function _pkcs5unpad ($text) { $pad = Ord ($text {strlen ($text)-1}); if ($pad > strlen ($text)) return false; if (strspn ($text, Chr ($pad), strlen ($text)-$pad)! = $pad) return false; $ret = substr ($text, 0,-1 * $pad); return $ret; } Private Function _hex2bin ($hex = False) { $ret = $hex!== false && preg_match ('/^[0-9a-fa-f]+$/i ', $hex)? Pack ("h*", $hex): false; return $ret; } } Copy CodeExamples of Use: !--? php header (' content-type:text/html; Charset=utf-8; '); include "xcrypt.php"; Echo ' ////////////////////////////////////// $a = isset ($_get[' a '])? $_get[' A ']: ' Test 123 '; //Key $key = ' 12345678123456781234567812345678 ';//256 bit $key = ' 1234567812345678 ';//1 The-bit $key = ' 12345678 ';//64 bit //Setup mode and IV $m = new Xcrypt ($key, ' CBC ', ' Auto '); //Get vector value echo ' vector: '; Var_dump ($m->getiv ()); //encryption $b = $m->encrypt ($a, ' base64 '); //Decryption $c = $m->decrypt ($b, ' base64 '); Echo ' after encryption: '; Var_dump ($b); Echo ' after decryption: '; Var_dump ($c); ///////////////////////////////////////// echo ' '; Copy Code

PHP, DES, AES

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