Php Generate Unique License Key
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Here's my final version of a GUIDv4 function (based on others work here) that should work on all platforms and gracefully fallback to less cryptographically secure version if others are not supported..
<?php
/**
* Returns a GUIDv4 string
*
* Uses the best cryptographically secure method
* for all supported pltforms with fallback to an older,
* less secure version.
*
* @param bool $trim
* @return string
*/
function GUIDv4 ($trim = true)
{
// Windows
if (function_exists('com_create_guid') true) {
if ($trim true)
return trim(com_create_guid(), '{}');
else
return com_create_guid();
}
// OSX/Linux
if (function_exists('openssl_random_pseudo_bytes') true) {
$data = openssl_random_pseudo_bytes(16);
$data[6] = chr(ord($data[6]) & 0x0f 0x40); // set version to 0100
$data[8] = chr(ord($data[8]) & 0x3f 0x80); // set bits 6-7 to 10
return vsprintf('%s%s-%s-%s-%s-%s%s%s', str_split(bin2hex($data), 4));
}
// Fallback (PHP 4.2+)
mt_srand((double)microtime() * 10000);
$charid = strtolower(md5(uniqid(rand(), true)));
$hyphen = chr(45); // '-'
$lbrace = $trim ? ' : chr(123); // '{'
$rbrace = $trim ? ' : chr(125); // '}'
$guidv4 = $lbrace.
substr($charid, 0, 8).$hyphen.
substr($charid, 8, 4).$hyphen.
substr($charid, 12, 4).$hyphen.
substr($charid, 16, 4).$hyphen.
substr($charid, 20, 12).
$rbrace;
return $guidv4;
}
?>The class can generate a unique identifier from some data values according to the schema fields and encodes them using the secret key.
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It can also take a previously generated GUID and decode it to extract the original encoded data using the same key.
GUID could store upto 8 bytes of positive numeric data.
PHP Tested: 5.6.19, 7.0.11
CONTENTS
1. CASES OF USAGE
You can use it fo generate unique identifiers, which store some data.
It is useful for shards of huge database. It can be used as key field for sharding logic also.
Some times it's good idea to store some relations in GUID.
For example, schema of GUID (for more detail see section 3.1.):
2. PRINCIPLE OF GENERATION
2.1. GUID code
- Get an array of data.
- Convert all values from DEC to HEX and normalize to its lengths (add zeros to make proper length)
- Create data string (implode all normalized values to one string)
- Normalize data string to length of 16 digits (add zeros to make proper length)
- Get cehck sum of data string - CRC32 based on custom polynomials (gets from your secret key)
- Add check sum to data string
- Get hash - md5() of check sum
- XOR data string and hash
- Replace last 8 digits to check sum
- Format string to guid like string
2.2. GUID decode
- Get guid and format it to hexadecimal string
- Get last 8 digits - check_sum_1
- Get hash - md5() of check sum
- XOR data string and hash
- Get check sum (check_sum_2) and data string from XOR result
- Check check_sum_1 and check_sum_2 and check sum of data string
- Fill data array with values from data string
- Conver all values from HEX to DEC
3. PUBLIC METHODS
GUID class is abstract, it provides 3 public and static methods.
3.1. GUID::init($schema, $key)
Initialization of class. Should be called before other methods.
$schema - associated array of data schema. Contains pairs 'filed => length':
filed - any valid associated array key.
lenght - int value, length of field in HEX digits:
$key - your secret key.
Examples of schemas:
3.2. GUID::code($data)
Generates GUID using $data.
$data - associated array. Keys of array equal to data schema. Values - exact value of the field.
If you skip some keys, they will get 0 values. If you use values lager than described in schema, they will be trancated. For examle:
Returns GUID or false (if class wasn't initialized or something very strange happend :D).
3.3. GUID::decode($guid)
Gets data from GUID.
Php Generate Unique Id
$guid - GUID string or just hexadecimal string (length 32).
Php Generate Unique License Key 2017
Returns data array or false (if class wasn't initialized or GUID fails with check sum).