applyCipherSuiteOverrides function

void applyCipherSuiteOverrides(String? kex, String? key, String? cipher, String? mac,)

Limits cipher suite support to the specified parameter, if not null.

Implementation

void applyCipherSuiteOverrides(
    String kex, String key, String cipher, String mac) {
  if (kex != null) {
    final int kexOverride = KEX.id(kex);
    if (kexOverride == 0) {
      throw FormatException(
          'unknown kex: $kex, supported: ${KEX.preferenceCsv()}');
    }
    KEX.supported = (int id) => id == kexOverride;
  }
  if (key != null) {
    final int keyOverride = Key.id(key);
    if (keyOverride == 0) {
      throw FormatException(
          'unknown key: $key, supported: ${Key.preferenceCsv()}');
    }
    Key.supported = (int id) => id == keyOverride;
  }
  if (cipher != null) {
    final int cipherOverride = Cipher.id(cipher);
    if (cipherOverride == 0) {
      throw FormatException(
          'unknown cipher: $cipher, supported: ${Cipher.preferenceCsv()}');
    }
    Cipher.supported = (int id) => id == cipherOverride;
  }
  if (mac != null) {
    final int macOverride = MAC.id(mac);
    if (macOverride == 0) {
      throw FormatException(
          'unknown mac: $mac, supported: ${MAC.preferenceCsv()}');
    }
    MAC.supported = (int id) => id == macOverride;
  }
}