if err != nil {
				return nil, err
			}
		}
	}

	return out, nil
}

// CheckSignature reports whether the signature on c is valid.
func (c *CertificateRequest) CheckSignature() error {
	return checkSignature(c.SignatureAlgorithm, c.RawTBSCertificateRequest, c.Signature, c.PublicKey, true)
}

// RevocationListEntry represents an entry in the revokedCertificates

	if der == nil {
		t.Fatal("Failed to find PEM block")
	}

	cert, err := ParseCertificate(der.Bytes)
	if err != nil {
		t.Fatal(err)
	}

	if err = cert.CheckSignature(ECDSAWithSHA256, nil, nil); err == nil {
		t.Fatal("CheckSignature unexpectedly return no error")
	}

	const expectedSubstring = " but have public key of type "
	if !strings.Contains(err.Error(), expectedSubstring) {