}
	for i := range hmacSigners {
		h := hmacSigners[i].Hash
		hmacSigners[i].HasherPool.New = func() interface{} {
			return h.New()
		}
	}
}

// HashBorrower allows borrowing hashes and will keep track of them.
func (s *SigningMethodHMAC) HashBorrower() HashBorrower {
	return HashBorrower{pool: &s.HasherPool, borrowed: make([]hash.Hash, 0, 2)}
}