PHP Cryptographic decryption function and DES encryption decryption instance _php tutorial

Encrypted decryption function in PHP and DES encryption and decryption instance

Examples, examples of PHP encryption and decryption

Cryptographic functions:

The code is as follows:

/*
* 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));
}

The decryption code is as follows:

The code is as follows:

/*
* 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:

The code is as follows:

/*
* 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;
}

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. '
";
Echo ' ciphertext: ', $encrypt. "
";
echo ' translation: ', $decrypt. '
";

The specific code for DES cryptographic decryption functions is as follows:

The code is as follows:

Class DES
{
var $key;
var $iv; Offset amount

function DES ($key, $iv = 0) {
Key Length 8 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) {
Encrypt, return uppercase hexadecimal string
$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 are the test results:

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:

The code is as follows:

/**
* Encrypt the parameters that need to be passed in the URL by the Get method
*/
function Args_encode ($data) {
if (Is_array ($data)) {
$string = Http_build_query ($data);
Return Base64_encode ($string);
} else {
return false;
}
}

/**
* Get the parameters passed in the URL in the Get mode
*/
function Getargs () {
$string = Base64_decode ($_get[' args ');
Parse_str ($string, $g);
return $g;
}

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