// or [encoding.BinaryUnmarshaler].
func New(h func() hash.Hash, key []byte) hash.Hash {
	if boring.Enabled {
		hm := boring.NewHMAC(h, key)
		if hm != nil {
			return hm
		}
		// BoringCrypto did not recognize h, so fall through to standard Go code.
	}
	hm := new(hmac)
	hm.outer = h()
	hm.inner = h()
	unique := true
	func() {
		defer func() {

The Go source code and supporting files in this directory
are covered by the usual Go license (see ../../../../LICENSE).

When building with GOEXPERIMENT=boringcrypto, the following applies.

The goboringcrypto_linux_amd64.syso object file is built
from BoringSSL source code by build/build.sh and is covered
by the BoringSSL license reproduced below and also at
https://boringssl.googlesource.com/boringssl/+/fips-20190808/LICENSE.