func New() hash.Hash {
	if boring.Enabled {
		return boring.NewSHA512()
	}
	d := &digest{function: crypto.SHA512}
	d.Reset()
	return d
}

// New512_224 returns a new hash.Hash computing the SHA-512/224 checksum.
func New512_224() hash.Hash {
	d := &digest{function: crypto.SHA512_224}
	d.Reset()
	return d
}

// New512_256 returns a new hash.Hash computing the SHA-512/256 checksum.