sodium_hex2bin

(PHP 7 >= 7.2.0, PHP 8)

sodium_hex2bin — Decodes a hexadecimally encoded binary string

Description

sodium_hex2bin(#[\SensitiveParameter] string $string, string $ignore = ""): string

Decodes a hexadecimally encoded binary string.

Like sodium_bin2hex() , sodium_hex2bin() is resistant to side-channel attacks while hex2bin() is not.

Parameters

string: Hexadecimal representation of data.
ignore: Optional string argument for characters to ignore.

Return Values

Returns the binary representation of the given string data.

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User Contributed Notes 1 note

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o-ren-shi at o2 dot pl ¶

6 months ago

For some very, very weird reason, if you pass an invalid argument to this function:

<?php $cfg['blowfish_secret'] = sodium_hex2bin('f16ce59f45714194371b48dZGBmq4sRDUFy99glKIlKjlxaB76luP64d6fb13851'); ?>

then you'll get "Fatal error: Uncaught Error: Call to undefined function sodium_hex2bin()" error instead of any error that would tell you that your argument is invalid.

I still keep wondering why this isn't intercepted internally and how can PHP find one of its internal functions undefined only due to the wrong argument developer calls them with.

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