Keygen Php Maker Examples
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I want to have a random serial created on my website everytime someone visits.
The format of the serial should be XXXXX-XXXXX-XXXXX-XXXXX.
X represents a random number or capital letter.
Unfortunately I have no idea how to do this. Could anybody please help me out?
So for example the random serial output could be: 3WT4A-NB34O-JU87P-B3UHS
Thanks a lot!
7 Answers
There are most certainly better ways of doing it, but this is the first that jumps to mind:
05/26/13 Edit: It's advised to keep the Count function outside of the loop. The reason for this is that you don't want to expend the extra clock cycles running this function through each iteration when you can simply run it once.
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maiorano84maiorano84Another approach is to calculate the four segments as random numbers in base 36.
salathesalatheThe most straightforward solution would be something like this.
Sample output:
There's a bunch of ways to approach this. One simple one is:
There are better ways to generate random strings then this but this would give you the basic functionality you're looking for.
John CondeJohn CondeIf you want to use this serial just because of uniqueness - you could also try to use UUID v4, as described in one of answers here: PHP function to generate v4 UUID
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There a lot of such answers at SO: https://stackoverflow.com/a/4356295/1091195
You can use the random string generator mentioned there, either you use it once to get a 20 letter string then insert dashes, or you can call it 4 times for 5 letter and concat the results.
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kubaNot the answer you're looking for? Browse other questions tagged php or ask your own question.
How can I encrypt - anything - within PHP with the public key I get from HTML5's keygen? Is there a standard function for that?
Thanks in advance!
arikarik4 Answers
The answer selected is absolutely incorrect!
If you are using the keygen element to generate a symmetric encryption key, it will negate any protections offered by using encryption in the first place.
Sending a symmetric encryption key over an insecure channel is one the first rules of using cryptography. Private keys are just that, private. What's more a public key should not be used as an encryption password, it can be used to encrypt data and/or verify data if it is an RSA keytype.
The keygen element should be used to generate a signed public key & challenge by first creating a private key (RSA) which gets registered and used by the browser to provide certificate based authentication.
For further research confirming this answer please see the following references:
jas-jas-This post includes some lengthy documentation on <keygen /> but for me the biggest take-away would definitely be that this tag is not supported in IE (any version); if you can get away with ignoring IE, then that post should help.
You can use the mcrypt functions available in PHP (if you have the library extension available on your server) - for example
Your HTML Form has a field: <keygen name='mykey' />
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Your PHP could do something like: (not tested)
For more on mcrypt see: http://uk3.php.net/manual/en/book.mcrypt.php
generates signed public keys, also known as SPKACs. The only easy way I know of to use them is to use phpseclib, a pure PHP SPKAC implementation. eg.
neubertneubert