val result = mutableListOf<String>()
      for (subjectAltName in subjectAltNames) {
        if (subjectAltName == null || subjectAltName.size < 2) continue
        if (subjectAltName[0] != type) continue
        val altName = subjectAltName[1] ?: continue
        result.add(altName as String)
      }
      return result

  }

  @Test fun subjectAltName() {
    // $ cat ./cert.cnf
    // [req]
    // distinguished_name=distinguished_name
    // req_extensions=req_extensions
    // x509_extensions=x509_extensions
    // [distinguished_name]
    // [req_extensions]
    // [x509_extensions]
    // subjectAltName=DNS:bar.com,DNS:baz.com
    //

  internal val generalName: DerAdapter<Pair<DerAdapter<*>, Any?>> =
    Adapters.choice(
      generalNameDnsName,
      generalNameIpAddress,
      Adapters.ANY_VALUE,
    )

  /**
   * ```
   * SubjectAltName ::= GeneralNames
   *
   * GeneralNames ::= SEQUENCE SIZE (1..MAX) OF GeneralName
   * ```
   */
  private val subjectAlternativeName: BasicDerAdapter<List<Pair<DerAdapter<*>, Any?>>> =

distinguished_name = req_distinguished_name
x509_extensions = v3_req
prompt = no

[req_distinguished_name]
C = US
ST = VA
L = Somewhere
O = MyOrg
OU = MyOU
CN = MyServerName

[v3_req]
subjectAltName = @alt_names

[alt_names]
IP.1 = 127.0.0.1
DNS.1 = localhost
```

Run `openssl` by specifying the configuration file and enter a passphrase if prompted:

```sh