get() {
      return tbsCertificate.extensions.firstOrNull {
        it.id == ObjectIdentifiers.SUBJECT_ALTERNATIVE_NAME
      }
    }

  val basicConstraints: Extension
    get() {
      return tbsCertificate.extensions.first {
        it.id == ObjectIdentifiers.BASIC_CONSTRAINTS
      }
    }

  /** Returns true if the certificate was signed by [issuer]. */
  @Throws(SignatureException::class)

    toVerify: X509Certificate,
    signingCert: X509Certificate,
    minIntermediates: Int,
  ): Boolean {
    if (toVerify.issuerDN != signingCert.subjectDN) {
      return false
    }
    if (signingCert.basicConstraints < minIntermediates) {
      return false // The signer can't have this many intermediates beneath it.
    }
    return try {
      toVerify.verify(signingCert.publicKey)
      true

  const val RSA_ENCRYPTION = "1.2.840.113549.1.1.1"
  const val SHA256_WITH_RSA_ENCRYPTION = "1.2.840.113549.1.1.11"
  const val SUBJECT_ALTERNATIVE_NAME = "2.5.29.17"
  const val BASIC_CONSTRAINTS = "2.5.29.19"
  const val COMMON_NAME = "2.5.4.3"
  const val ORGANIZATIONAL_UNIT_NAME = "2.5.4.11"