func (s *sigHead) verify(pl []byte, key interface{}, method crypto.SigningMethod) error {
if s.method.Alg() != method.Alg() || s.method.Hasher() != method.Hasher() {
return ErrMismatchedAlgorithms
}
return method.Verify(format(s.Protected, pl), s.Signature, key)
}
