return C._goboringcrypto_EVP_sha512()
	}
	return nil
}

// NewHMAC returns a new HMAC using BoringCrypto.
// The function h must return a hash implemented by
// BoringCrypto (for example, h could be boring.NewSHA256).
// If h is not recognized, NewHMAC returns nil.
func NewHMAC(h func() hash.Hash, key []byte) hash.Hash {
	ch := h()
	md := hashToMD(ch)
	if md == nil {
		return nil
	}

const RandReader = randReader(0)

func NewSHA1() hash.Hash   { panic("boringcrypto: not available") }
func NewSHA224() hash.Hash { panic("boringcrypto: not available") }
func NewSHA256() hash.Hash { panic("boringcrypto: not available") }
func NewSHA384() hash.Hash { panic("boringcrypto: not available") }
func NewSHA512() hash.Hash { panic("boringcrypto: not available") }

// also implements [encoding.BinaryMarshaler] and
// [encoding.BinaryUnmarshaler] to marshal and unmarshal the internal
// state of the hash.
func New() hash.Hash {
	if boring.Enabled {
		return boring.NewSHA256()
	}
	d := new(digest)
	d.Reset()
	return d
}

// New224 returns a new hash.Hash computing the SHA224 checksum.
func New224() hash.Hash {
	if boring.Enabled {
		return boring.NewSHA224()
	}

		panic("boringcrypto: SHA224_Final failed")
	}
	return append(dst, h.out[:]...)
}

// NewSHA256 returns a new SHA256 hash.
func NewSHA256() hash.Hash {
	h := new(sha256Hash)
	h.Reset()
	return h
}

type sha256Hash struct {
	ctx C.GO_SHA256_CTX
	out [256 / 8]byte
}