How To Generate hash value equivalent to node.js in php-CodePudding

I have been facing a problem in my Project. I want to generate a hash which is equivalent to node.js hash value. Here is my Node.js code

crypto.createHash('sha256').update('').digest('hex')

Which generates e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855

And my PHP code is

$secret_key = hash('sha256', '', true);
$contentHash = hash_hmac('sha256', '', $secret_key);

Which generates bfe4527091e7291c5b9a9359c579a97302ba3a7d969994f80a562db7bad4315c

I want to generate same hash value though the platform is different.

CodePudding user response：

You don't want HMAC, you just want straight SHA256 in hex format:

$string = '';
$hash = hash('sha256', $string);
echo $hash;

Yields:

e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855