Encryption and decryption functions in PHP and DES encryption decryption

Examples, examples of PHP encryption decryption

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Cryptographic functions /* * Function: Encrypt string to handle * Parameter one: Content that needs to be encrypted * Parameter two: key */ function Passport_encrypt ($STR, $key) {//cryptographic functions Srand (Double) microtime () * 1000000); $encrypt _key=md5 (rand (0, 32000)); $ctr = 0; $tmp = '; for ($i =0; $i <strlen ($STR); $i + +) { $ctr = $ctr ==strlen ($encrypt _key) 0: $ctr; $tmp. = $encrypt _key[$ctr]. ($str [$i] ^ $encrypt _key[$ctr + +]); } Return Base64_encode (Passport_key ($tmp, $key)); } The decryption code is as follows: /* * Function: Decrypt the string for processing * Parameter one: Need to decrypt the ciphertext * Parameter two: key */ function Passport_decrypt ($STR, $key) {//decryption functions $str =passport_key (Base64_decode ($STR), $key); $tmp = '; for ($i =0; $i <strlen ($STR); $i + +) { $MD 5= $str [$i]; $tmp. = $str [+ + $i] ^ $MD 5; } return $tmp; } Auxiliary functions: /* * Auxiliary function */ function Passport_key ($str, $encrypt _key) { $encrypt _key=md5 ($encrypt _key); $ctr = 0; $tmp = '; for ($i =0; $i <strlen ($STR); $i + +) { $ctr = $ctr ==strlen ($encrypt _key) 0: $ctr; $tmp. = $str [$i] ^ $encrypt _key[$ctr + +]; } return $tmp; } Use the following example $str = ' Author: www.111cn.net '; $key = ' 123456 '; $encrypt =passport_encrypt ($str, $key); $decrypt =passport_decrypt ($encrypt, $key); Echo ' original: ', $str. ' <br>Echo ' redaction: ', $encrypt. ' <br>echo ' translation: ', $decrypt. ' <br>

Des encryption and decryption function

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<?php Class DES { var $key; var $iv; Offset amount function DES ($key, $iv = 0) { Key Length 8 For example: 1234ABCD $this->key = $key; if ($iv = = 0) { $this->iv = $key; } else { $this->iv = $iv; Mcrypt_create_iv (Mcrypt_get_block_size (Mcrypt_des, MCRYPT_MODE_CBC), mcrypt_dev_random); } } function Encrypt ($STR) { Encryption, returning uppercase hexadecimal strings $size = Mcrypt_get_block_size (Mcrypt_des, MCRYPT_MODE_CBC); $str = $this->pkcs5pad ($str, $size); Return Strtoupper (Bin2Hex (MCRYPT_CBC (mcrypt_des, $this->key, $str, Mcrypt_encrypt, $this->iv))); } function Decrypt ($STR) { Decrypt $strBin = $this->hex2bin (strtolower ($STR)); $str = MCRYPT_CBC (mcrypt_des, $this->key, $strBin, Mcrypt_decrypt, $this->iv); $str = $this->pkcs5unpad ($STR); return $str; } function Hex2bin ($hexData) { $binData = ""; for ($i = 0; $i < strlen ($hexData); $i + + 2) { $binData. = Chr (Hexdec (substr ($hexData, $i, 2)); } return $binData; } function Pkcs5pad ($text, $blocksize) { $pad = $blocksize-(strlen ($text)% $blocksize); Return $text. Str_repeat (Chr ($pad), $pad); } function Pkcs5unpad ($text) { $pad = Ord ($text {strlen ($text)-1}); if ($pad > strlen ($text)) return false; if (strspn ($text, Chr ($pad), strlen ($text)-$pad)!= $pad) return false; Return substr ($text, 0,-1 * $pad); } } ?> Here is the test result: $str = ' 12345678 '; $key = ' 1234ABCD '; $crypt = new DES ($key); $mstr = $crypt->encrypt ($STR); $str = $crypt->decrypt ($MSTR); echo $str. ' <=> ' $mstr;

Example 2

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/** * Encrypt parameters that need to be passed in the URL by get way */ Function Args_encode ($data) { if (Is_array ($data)) { $string = Http_build_query ($data); return Base64_encode ($string); } else { return false; } } /** * Gets the parameters passed by get in the URL */ Function Getargs () { $string = Base64_decode ($_get[' args ')); br> parse_str ($string, $g); return $g; }