Manual:$wgHKDFAlgorithm

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<translate> Security</translate>: $wgHKDFAlgorithm
Algorithm for HMAC-based key derivation function (fast, cryptographically secure random numbers).
<translate> Introduced in version:</translate>	1.24.0 (Gerrit change 137077; git #af66c04d)
<translate> Removed in version:</translate>	<translate> still in use</translate>
<translate> Allowed values:</translate>	(string)
<translate> Default value:</translate>	`sha256`
<translate> Other settings:</translate> <translate> Alphabetical</translate> \| <translate> By function</translate>

Details

The algorithm must be one of those enumerated by the function hash_algos(): depending on the PHP version, it can be: MD5, SHA-1, SHA-2, Whirlpool, RIPEMD, HAVAL, Tiger, Snefru...