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MWCryptRand.php
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<?php
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class
MWCryptRand
{
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36
public
static
function
generateHex
( $chars ) {
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// hex strings are 2x the length of raw binary so we divide the length in half
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// odd numbers will result in a .5 that leads the generate() being 1 character
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// short, so we use ceil() to ensure that we always have enough bytes
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$bytes = ceil( $chars / 2 );
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// Generate the data and then convert it to a hex string
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$hex = bin2hex( random_bytes( $bytes ) );
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// A bit of paranoia here, the caller asked for a specific length of string
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// here, and it's possible (eg when given an odd number) that we may actually
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// have at least 1 char more than they asked for. Just in case they made this
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// call intending to insert it into a database that does truncation we don't
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// want to give them too much and end up with their database and their live
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// code having two different values because part of what we gave them is truncated
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// hence, we strip out any run of characters longer than what we were asked for.
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return
substr( $hex, 0, $chars );
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}
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}
MWCryptRand
Definition
MWCryptRand.php:27
MWCryptRand\generateHex
static generateHex( $chars)
Generate a run of cryptographically random data and return it in hexadecimal string format.
Definition
MWCryptRand.php:36
includes
utils
MWCryptRand.php
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