func ValidateCSR(csrPEM []byte, subjectIDs []string) bool {
	csr, err := util.ParsePemEncodedCSR(csrPEM)
	if err != nil {
		return false
	}
	if err := csr.CheckSignature(); err != nil {
		return false
	}
	csrIDs, err := util.ExtractIDs(csr.Extensions)
	if err != nil {
		return false
	}
	for _, s1 := range csrIDs {
		if !slices.Contains(subjectIDs, s1) {
			return false

        it.id == ObjectIdentifiers.BASIC_CONSTRAINTS
      }
    }

  /** Returns true if the certificate was signed by [issuer]. */
  @Throws(SignatureException::class)
  fun checkSignature(issuer: PublicKey): Boolean {
    val signedData = CertificateAdapters.tbsCertificate.toDer(tbsCertificate)

    return Signature.getInstance(tbsCertificate.signatureAlgorithmName).run {
      initVerify(issuer)

	// ones we parsed. (We don't support custom curves ourselves.)
	for i, parent := range chain[1:] {
		if parent.PublicKeyAlgorithm != ECDSA {
			continue
		}
		if err := parent.CheckSignature(chain[i].SignatureAlgorithm,
			chain[i].RawTBSCertificate, chain[i].Signature); err != nil {
			return nil, err
		}
	}
	return chain, nil
}