Encryption and decryption functions and DES encryption and decryption examples in PHP

Examples of encryption and decryption functions and DES encryption and decryption in PHP

Examples of encryption and decryption in PHP

Encryption function:

The code is as follows:

/*
*Function: Encrypt string
*Parameter 1: Content that needs to be encrypted
*Parameter 2: 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: Decrypt string
*Parameter 1: Ciphertext to be decrypted
*Parameter 2: Key
*/
function passport_decrypt($str,$key){ //Decryption function
$str=passport_key(base64_decode($str),$key);
$tmp='';
for($i=0;$i $md5=$str[$i];
$tmp.=$str[++$i] ^ $md5;
}
return $tmp;
}

Auxiliary function:

The code is as follows:

/*
*Auxiliary function
*/
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 as shown below

The code is as follows:

$str='Author: www.jb51.net';
$key='123456';
$encrypt=passport_encrypt($str,$key);
$decrypt=passport_decrypt($encrypt,$key);
echo 'Original text:',$str."

";
echo 'Cryptotext:',$encrypt."

";
echo 'Translation:',$decrypt."

The specific code of the DES encryption and decryption function is as follows:

The code is as follows:

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) {
//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 );
}
}
?>

The following 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:

/**
*Encrypt parameters that need to be passed in the url through 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 get method in the url
*/
function getargs() {
$string = base64_decode($_GET['args']);
parse_str($string,$g);
return $g;
}

Related labels：

des php and code example function encryption encrypt and decode Example of

source：php.cn

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