PHP encryption and decryption instance analysis, _ PHP Tutorial-php Tutorial

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PHP encryption and decryption instance analysis ,. PHP encryption and decryption example analysis, this article describes the PHP encryption and decryption method. For your reference, please refer to: encryption functionstring2secret ($ str) {$ key123; $ td PHP encryption and decryption instance analysis,

This article describes the PHP encryption and decryption methods. We will share this with you for your reference. The details are as follows:

// Encryption function string2secret ($ str) {$ key = "123"; $ td = mcrypt_module_open (MCRYPT_DES, '', 'ECB ',''); $ iv = mcrypt_create_iv (Encrypt ($ td), MCRYPT_RAND); $ ks = mcrypt_enc_get_key_size ($ td); $ key = substr (md5 ($ key), 0, $ ks ); mcrypt_generic_init ($ td, $ key, $ iv); $ secret = mcrypt_generic ($ td, $ str); mcrypt_generic_deinit ($ td); mcrypt_module_close ($ td ); return $ secret;} // decrypt function secret2string ($ sec) {$ key = "123"; $ td = mcrypt_module_open (MCRYPT_DES, '', 'ECB ',''); $ iv = mcrypt_create_iv (Encrypt ($ td), MCRYPT_RAND); $ ks = mcrypt_enc_get_key_size ($ td); $ key = substr (md5 ($ key), 0, $ ks ); mcrypt_generic_init ($ td, $ key, $ iv); $ string = mdecrypt_generic ($ td, $ sec); mcrypt_generic_deinit ($ td); mcrypt_module_close ($ td ); return trim ($ string);} echo secret2string (string2secret ("11111111111111111"); // The result is 11111111111111111 echo'
'. String2secret ("11111111111111111"); // garbled echo'
'; // $ String: string to be encrypted $ isEncrypt = true: encrypted $ isEncrypt = false: decrypted function dencrypt ($ string, $ isEncrypt = true, $ key = "KEY_SPACE") {if (! Isset ($ string {0}) |! Isset ($ key {0}) {return false;} $ dynKey = $ isEncrypt? Hash ('sha1', microtime (true): substr ($ string, 0, 40); $ fixedKey = hash ('sha1', $ key ); $ dynKeyPart1 = substr ($ dynKey, 0, 20); $ dynKeyPart2 = substr ($ dynKey, 20); $ fixedKeyPart1 = substr ($ fixedKey, 0, 20 ); $ fixedKeyPart2 = substr ($ fixedKey, 20); $ key = hash ('sha1', $ dynKeyPart1. $ fixedKeyPart1. $ dynKeyPart2. $ fixedKeyPart2); $ string = $ isEncrypt? $ FixedKeyPart1. $ string. $ dynKeyPart2: (isset ($ string {339 })? Gzuncompress (base64_decode (substr ($ string, 40): base64_decode (substr ($ string, 40); $ n = 0; $ result = ''; $ len = strlen ($ string); for ($ n = 0; $ n <$ len; $ n ++) {$ result. = chr (ord ($ string {$ n}) ^ ord ($ key {$ n % 40});} return $ isEncrypt? $ DynKey. str_replace ('=', '', base64_encode ($ n> 299? Gzcompress ($ result): substr ($ result, 20,-20);} echo strlen (dencrypt ("12345678912345 "));

I hope this article will help you with PHP programming.

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Example: PHP encryption and decryption methods. For your reference, please refer to the following details: // encrypted function string2secret ($ str) {$ key = "123"; $ td...

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