generic Hash
expect fun genericHash(message: UByteArray, requestedHashLength: Int = crypto_generichash_BYTES, key: UByteArray? = null): UByteArray
Request computing a hash of message, with a specific hash length and optional key. The specific hash length can be between crypto_generichash_blake2b_BYTES_MIN and crypto_generichash_blake2b_BYTES_MAX. If the key is provided it needs the hash will be different for each different key.