PHP: How can I generate a HmacSHA256 signature of a string

Question

Is there any way to create a HmacSHA256 signature of a string in php?

Answer 1

The hash_hmac() function could help, here :

Generate a keyed hash value using the HMAC method

For example, the following portion of code :

$hash = hash_hmac('sha256', 'hello, world!', 'mykey');
var_dump($hash);

Gives the following output :

string '07a932dd17adc59b49561f33980ec5254688a41f133b8a26e76c611073ade89b' (length=64)

And, to get the list of hashing algorithms that can be used, see hash_algos().

Answer 2

Use hash_hmac:

$sig = hash_hmac('sha256', $string, $secret)

Where $secret is your key.