Examples, examples of PHP encryption decryption
Cryptographic functions:
code as follows:/*
* 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, $key));
}
The decryption code is as follows:
code as follows:/*
* Function: Decryption of strings
* Parameter one: Need to decrypt the ciphertext
* Parameter two: Key
*/
function Passport_decrypt ($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 $tmp;
}
Auxiliary functions:
code as follows:/*
* Auxiliary function
*/
function Passport_key ($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
The
code is as follows: $str = ' Author: www.jb51.net ';
$key = ' 123456 ';
$encrypt =passport_encrypt ($str, $key);
$decrypt =passport_decrypt ($encrypt, $key);
Echo ' original: ', $str. ' <br><hr> ";
Echo ' redaction: ', $encrypt. ' <br><hr> ";
echo ' translation: ', $decrypt. ' <br><hr> ";
Des encryption and decryption function specific code is as follows:
code is as follows: <?php
class DES
{
var $key;
var $iv; Offset
function DES ($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, returns 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) {
//Decryption
$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:
The
code is as follows: $str = ' 12345678 ';
$key = ' 1234ABCD ';
$crypt = new DES ($key);
$mstr = $crypt->encrypt ($STR);
$str = $crypt->decrypt ($MSTR);
echo $str. ' <=> '. $mstr;
Example 2
The code is as follows:
code is as follows:/**
* Encrypt parameters that need to be passed in the URL by get way
*/
function Args_encode ($data) {
if (Is_array ($data)) {
$string = Http_build_query ($data);
return Base64_encode ($string);
} else {
return false;
}
}
/**
* Gets the parameters passed by get mode in the URL
*/
function Getargs () {
$string = Base64_decode ($_get[' args '));
Parse_str ($string, $g);
return $g;
}
