private JceMasterKey internalGetMasterKey()

in src/main/java/com/amazonaws/encryptionsdk/jce/KeyStoreProvider.java [104:145]
42 lines of code
10 McCabe index (conditional complexity)

  private JceMasterKey internalGetMasterKey(final String provider, final String keyId) {
    final Entry entry;
    try {
      entry = keystore_.getEntry(keyId, keystore_.isKeyEntry(keyId) ? protection_ : null);
    } catch (NoSuchAlgorithmException | UnrecoverableEntryException | KeyStoreException e) {
      throw new UnsupportedProviderException(e);
    }
    if (entry == null) {
      throw new NoSuchMasterKeyException();
    }
    if (entry instanceof SecretKeyEntry) {
      final SecretKeyEntry skEntry = (SecretKeyEntry) entry;
      if (!skEntry.getSecretKey().getAlgorithm().equals(keyAlgorithm_)) {
        return null;
      }
      return JceMasterKey.getInstance(skEntry.getSecretKey(), provider, keyId, wrappingAlgorithm_);
    } else if (entry instanceof PrivateKeyEntry) {
      final PrivateKeyEntry pkEntry = (PrivateKeyEntry) entry;
      if (!pkEntry.getPrivateKey().getAlgorithm().equals(keyAlgorithm_)) {
        return null;
      }
      return JceMasterKey.getInstance(
          pkEntry.getCertificate().getPublicKey(),
          pkEntry.getPrivateKey(),
          provider,
          keyId,
          wrappingAlgorithm_);
    } else if (entry instanceof TrustedCertificateEntry) {
      final TrustedCertificateEntry certEntry = (TrustedCertificateEntry) entry;
      if (!certEntry.getTrustedCertificate().getPublicKey().getAlgorithm().equals(keyAlgorithm_)) {
        return null;
      }
      return JceMasterKey.getInstance(
          certEntry.getTrustedCertificate().getPublicKey(),
          null,
          provider,
          keyId,
          wrappingAlgorithm_);
    } else {
      throw new NoSuchMasterKeyException();
    }
  }