PHP encryption and decryption function and DES encryption and decryption instance, phpdes encryption and decryption instance

PHP encryption and decryption function and DES encryption and decryption instance, phpdes encryption and decryption instance

This article describes the application of the encryption and decryption function in PHP and DES encryption and decryption, and shares it with you for your reference. The details are as follows:

Example: Example of php encryption and decryption

Encryption function:

Copy codeThe 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 <strlen ($ str); $ 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:
Copy codeThe 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 <strlen ($ str); $ I ++ ){
$ Md5 = $ str [$ I];
$ Tmp. = $ str [++ $ I] ^ $ md5;
}
Return $ tmp;
}
Auxiliary functions:
Copy codeThe Code is as follows :/*
* Auxiliary functions
*/
Function passport_key ($ str, $ encrypt_key ){
$ Encrypt_key = md5 ($ encrypt_key );
$ Ctr = 0;
$ Tmp = '';
For ($ I = 0; $ I <strlen ($ str); $ I ++ ){
$ Ctr = strlen ($ encrypt_key )? 0: $ ctr;
$ Tmp. = $ str [$ I] ^ $ encrypt_key [$ ctr ++];
}
Return $ tmp;
}
Use
Copy codeThe Code is as follows: $ str = 'author: www.jb51.net ';
$ Key = '000000 ';
$ Encrypt = passport_encrypt ($ str, $ key );
$ Decrypt = passport_decrypt ($ encrypt, $ key );
Echo 'original: ', $ str. "<br> Echo 'ciphertext: ', $ encrypt. "<br> Echo 'translation: ', $ decrypt. "<br> The specific code of the DES encryption and decryption function is as follows:
Copy codeThe Code is as follows: <? Php
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:
Copy codeThe Code is as follows: $ str = '20150901 ';
$ 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 codeThe 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;
}

I hope this article will help you with PHP programming.

Php encryption and decryption functions

Base64_encode plus
Base64_decode

Php des encryption function

The two functions are as follows:
Encryption function: encrypt
Function encrypt ($ encrypt, $ key = ""){
$ Iv = mcrypt_create_iv (mcrypt_get_iv_size (MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB), MCRYPT_RAND );
$ Passcrypt = mcrypt_encrypt (MCRYPT_RIJNDAEL_256, $ key, $ encrypt, MCRYPT_MODE_ECB, $ iv );
$ Encode = base64_encode ($ passcrypt );
Return $ encode;
}

Decryption function: decrypt
Function decrypt ($ decrypt, $ key = ""){
$ Decoded = base64_decode ($ decrypt );
$ Iv = mcrypt_create_iv (mcrypt_get_iv_size (MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB), MCRYPT_RAND );
$ Decrypted = mcrypt_decrypt (MCRYPT_RIJNDAEL_256, $ key, $ decoded, MCRYPT_MODE_ECB, $ iv );
Return $ decrypted;
}