Encryption and decryption function in PHP and DES encryption and decryption instance _php techniques

This article describes the encryption and decryption function in PHP and DES encryption and decryption application, share for everyone to reference. Specifically as follows:

Examples, examples of PHP encryption decryption

Cryptographic functions:

Copy Code 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:

Copy Code code 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:

Copy Code 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

Copy Code code as follows:

$str = ' Author: www.jb51.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 specific code is as follows:

Copy Code code as follows:

<?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:

Copy Code code 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:

Copy Code code 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;
}

PS: About encryption technology, the site also provides the following encryption tools for your reference to use:

MD5 Online encryption tool: Http://tools.jb51.net/password/CreateMD5Password

Escape Encryption/decryption tool: http://tools.jb51.net/password/escapepwd

Online SHA1 encryption tool: Http://tools.jb51.net/password/sha1encode

short link (short URL) online generation tool: http://tools.jb51.net/password/dwzcreate

short link (short URL) online Restore tool: Http://tools.jb51.net/password/unshorturl

High Strength password generator: Http://tools.jb51.net/password/CreateStrongPassword

I hope this article will help you with your PHP program design.