PHP encryption and decryption function and DES encryption and decryption instance _ PHP Tutorial

PHP and DES encryption and decryption instances. Example of the encryption and decryption function in PHP and the DES encryption and decryption instance. example of the php encryption and decryption function: the code is as follows: ** function: encrypt strings * parameter 1: encryption and decryption functions in PHP and DES encryption and decryption instances

Example: example of php encryption and decryption

Encryption function:

The code is as follows:

/*
* Function: encrypt strings.
* Parameter 1: content 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 = 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: decrypts strings.
* Parameter 1: ciphertext to be decrypted
* Parameter 2: Key
*/
Function passport_decrypt ($ str, $ key) {// decrypt the function
$ Str = passport_key (base64_decode ($ str), $ key );
$ Tmp = '';
For ($ I = 0; $ I $ Md5 = $ str [$ I];
$ Tmp. = $ str [++ $ I] ^ $ md5;
}
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 = strlen ($ encrypt_key )? 0: $ ctr;
$ Tmp. = $ str [$ I] ^ $ encrypt_key [$ ctr ++];
}
Return $ tmp;
}

Use

The code is as follows:

$ Str = 'Author: www.jb51.net ';
$ Key = '000000 ';
$ Encrypt = passport_encrypt ($ str, $ key );
$ Decrypt = passport_decrypt ($ encrypt, $ key );
Echo 'original: ', $ str ."
";
Echo 'ciphertext: ', $ 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 ){
// The key length is 8, for example, 1234 abcd.
$ 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 ){
// Encrypted, returns an 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 test results are as follows:

The code is as follows:

$ Str = '000000 ';
$ 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:

/**
* Parameters that need to be passed in the url through the get method for encryption
*/
Function args_encode ($ data ){
If (is_array ($ data )){
$ String = http_build_query ($ data );
Return base64_encode ($ string );
} Else {
Return false;
}
}

/**
* Get the parameters passed by the get method in the url
*/
Function getargs (){
$ String = base64_decode ($ _ GET ['args ']);
Parse_str ($ string, $ g );
Return $ g;
}

Example of encryption: example of php encryption and decryption encryption function: the code is as follows:/** function: encryption of strings * parameter 1: encryption required...