Encrypt and decrypt string function source code in PHP

The source code of the cryptographic decryption string function in PHP: /** * Function: Encrypt string processing * Parameter one: Content that needs to be encrypted * Parameter two: key */ function Passport_encrypt ($STR, $key) {//encryption function Srand (Double) microtime () * 1000000); $encrypt _key=md5 (rand (0, 32000)); $ctr = 0; $tmp = "; for ($i =0; $i<> $ctr = $ctr ==strlen ($encrypt _key)? 0: $ctr; $tmp. = $encrypt _key[$ctr]. ($str [$i] ^ $encrypt _key[$ctr + +]); } Return Base64_encode (Passport_key ($tmp, $key)); } /** * Function: Decryption of strings * Parameter one: ciphertext to be decrypted * Parameter two: key */ function Passport_decrypt ($STR, $key) {//decryption functions $str =passport_key (Base64_decode ($STR), $key); $tmp = "; for ($i =0; $i<> $MD 5= $str [$i]; $tmp. = $str [+ + $i] ^ $MD 5; } return $tmp; } /** * Auxiliary functions */ function Passport_key ($str, $encrypt _key) { $encrypt _key=md5 ($encrypt _key); $ctr = 0; $tmp = "; for ($i =0; $i<> $ctr = $ctr ==strlen ($encrypt _key)? 0: $ctr; $tmp. = $str [$i] ^ $encrypt _key[$ctr + +]; } return $tmp; } $str = ' Author: uphtm.com; $key = ' uphtm.com '; $encrypt =passport_encrypt ($str, $key); $decrypt =passport_decrypt ($encrypt, $key); Echo ' original: ', $str. ' "; Echo ' ciphertext: ', $encrypt. " "; echo ' translation: ', $decrypt. ' "; ?> Copy Code

Encrypted decryption, PHP

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