to select // AES-128, AES-192, or AES-256. func New(key []byte) (*Block, error) { // This call is outline to let the allocation happen on the parent stack. return newOutlined(&Block{}, key) } // newOutlined is marked go:noinline to avoid it inlining into New, and making New // too complex to inline itself. // //go:noinline func newOutlined(b *Block, key []byte) (*Block, error) { switch len(key) { case aes128KeySize, aes192KeySize, aes256KeySize: default: return nil, KeySizeError(len(key)) } return...