Get a hash of the message

# sodium_crypto_generichash

(PHP 7 >= 7.2.0, PHP 8)

sodium_crypto_generichash — Get a hash of the message

### Description

sodium_crypto_generichash(string `$message`, #[\SensitiveParameter] string `$key` = "", int `$length` = `SODIUM_CRYPTO_GENERICHASH_BYTES`): string

Hash a message with BLAKE2b.

### Parameters

`message`
  The message being hashed.
`key`
  (Optional) cryptographic key. This serves the same function as a HMAC key, but it's utilized as a reserved section of the internal BLAKE2 state.
`length`
  Output size.

### Return Values

The cryptographic hash as raw bytes. If a hex-encoded output is desired, the result can be passed to sodium_bin2hex().

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