Example of AES encryption and decryption in php

Put the code first. There are two files: AES. php (aes algorithm file) and aesDemo. php (application instance File) aesDemo. php:

Example,

 MakeKey ($ key); $ encode = "123456"; // The encrypted string $ ct = $ aes-> encryptString ($ encode, $ keys ); echo "encode = ". $ ct."
"; $ Cpt = $ aes-> decryptString ($ ct, $ keys); echo" decode = ". $ cpt;?>

Example, AES encryption class

 Bit = $ bit; $ this-> key = $ key; $ this-> iv = $ iv; $ this-> mode = $ mode; switch ($ this-> bit) {case 192: $ this-> cipher = encrypt; break; case 256: $ this-> cipher = MCRYPT_RIJNDAEL_256; break; default: $ this-> cipher = MCRYPT_RIJNDAEL_128 ;} switch ($ this-> mode) {case 'ECB ': $ this-> mode = MCRYPT_MODE_ECB; break; case 'cfb': $ this-> mode = MCRYPT_MODE_CFB; break; case 'ofb': $ this-> mode = MCRYPT_MODE_OFB; break; case 'nofb ': $ this-> mode = MCRYPT_MODE_NOFB; break; default: $ this-> mode = MCRYPT_MODE_CBC;} public function encrypt ($ data) {$ data = base64_encode (mcrypt_encrypt ($ this-> cipher, $ this-> key, $ data, $ this-> mode, $ this-> iv); return $ data;} public function decrypt ($ data) {$ data = mcrypt_decrypt ($ this-> cipher, $ this-> key, base64_decode ($ data), $ this-> mode, $ this-> iv); $ data = rtrim ($ data ),".. "); return $ data ;}// usage method $ aes = new AESMcrypt ($ bit = 128, $ key = 'abcdef1234567890', $ iv = '0987654321cba ba ', $ mode = 'cbc'); $ c = $ aes-> encrypt ('haowei. me '); var_dump ($ aes-> decrypt ($ c ));

Example: an encryption and decryption class

 * // Instantiation class * // parameter $ _ bit: Format. it can be 256, 192, or 128 bytes. the default value is 128 bytes * // parameter $ _ type: encryption/decryption mode, supports cfb, cbc, nofb, ofb, stream, and ecb. the default value is ecb * // parameter $ _ key: key. the default value is abcdefghijuklmno * $ tcaes = new TCAES (); * $ string = 'laohu'; * // encryption * $ encodeString = $ tcaes-> encode ($ string ); * // decrypt * $ decodeString = $ tcaes-> decode ($ encodeString );*

*/Class TCAES {private $ _ bit = MCRYPT_RIJNDAEL_256; private $ _ type = MCRYPT_MODE_CBC; // private $ _ key = 'authorization'; private $ _ key = 'abcdefjuklmno '; // private key $ _ use_base64 = true; private $ _ iv_size = null; private $ _ iv = null; /*** @ param string $ _ key * @ param int $ _ bit uses 128 byte by default * @ param string $ _ type encryption/decryption mode * @ param boolean $ _ use_base64 default use base64 secondary encryption */public Function _ construct ($ _ key = '', $ _ bit = 128, $ _ type = 'ECB ', $ _ use_base64 = true) {// encrypted byte if (192 ==== _ bit) {$ this-> _ bit = MCRYPT_RIJNDAEL_192;} elseif (128 ==== _ bit) {$ this-> _ bit = MCRYPT_RIJNDAEL_128;} else {$ this-> _ bit = MCRYPT_RIJNDAEL_256;} // encryption method if ('cfb '==== _ type) {$ this-> _ type = MCRYPT_MODE_CFB;} elseif ('cbc' ===$ _ type) {$ this-> _ type = MCRYPT_MODE_CBC ;} elseif ('nofb '===$ _ type) {$ t His-> _ type = MCRYPT_MODE_NOFB;} elseif ('ofb' ===$ _ type) {$ this-> _ type = MCRYPT_MODE_OFB ;} elseif ('stream' ===$ _ type) {$ this-> _ type = MCRYPT_MODE_STREAM;} else {$ this-> _ type = MCRYPT_MODE_ECB ;} // key if (! Empty ($ _ key) {$ this-> _ key = $ _ key;} // whether to use base64 $ this-> _ use_base64 = $ _ use_base64; $ this-> _ iv_size = mcrypt_get_iv_size ($ this-> _ bit, $ this-> _ type); $ this-> _ iv = mcrypt_create_iv ($ this-> _ iv_size, MCRYPT_RAND);}/*** encrypted * @ param string $ string to be encrypted * @ return string */public function encode ($ string) {if (MCRYPT_MODE_ECB ===$ this-> _ type) {$ encodeString = mcrypt_encrypt ($ this-> _ bit, $ this-> _ key, $ string, $ this-> _ type);} else {$ encodeString = mcrypt_encrypt ($ this-> _ bit, $ this-> _ key, $ string, $ this-> _ type, $ this-> _ iv);} if ($ this-> _ use_base64) $ encodeString = base64_encode ($ encodeString); return $ encodeString ;} /*** decrypt * @ param string $ string to be decrypted * @ return string */public function decode ($ string) {if ($ this-> _ use_base64) $ string = base64_decode ($ string); $ string = $ this-> toHexString ($ string); if (MCRYPT_MODE_ECB ===$ this-> _ type) {$ decodeString = mcrypt_decrypt ($ this-> _ bit, $ this-> _ key, $ string, $ this-> _ type );} else {$ decodeString = mcrypt_decrypt ($ this-> _ bit, $ this-> _ key, $ string, $ this-> _ type, $ this-> _ iv );} return $ decodeString;}/*** convert $ string to hexadecimal form * @ param string $ string * @ return stream */private function toHexString ($ string) {$ buf = ""; for ($ I = 0; $ I <strlen ($ string); $ I ++) {$ val = dechex (ord ($ string {$ I}); if (strlen ($ val) <2) $ val = "0 ". $ val; $ buf. = $ val;} return $ buf ;} /*** convert the hexadecimal stream $ string to a string * @ param stream $ string * @ return string */private function fromHexString ($ string) {$ buf = ""; for ($ I = 0; $ I <strlen ($ string); $ I + = 2) {$ val = chr (hexdec (substr ($ string, $ I, 2); $ buf. = $ val;} return $ buf ;}}

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