private FileEncryptionProperties()

in parquet-hadoop/src/main/java/org/apache/parquet/crypto/FileEncryptionProperties.java [44:91]
42 lines of code
14 McCabe index (conditional complexity)

  private FileEncryptionProperties(ParquetCipher cipher, 
      byte[] footerKey, byte[] footerKeyMetadata, boolean encryptedFooter,
      byte[] aadPrefix, boolean storeAadPrefixInFile,
      Map<ColumnPath, ColumnEncryptionProperties> columnPropertyMap) {

    if (null == footerKey) {
      throw new IllegalArgumentException("Footer key is null");
    }
    if (! (footerKey.length == 16 || footerKey.length == 24 || footerKey.length == 32)) {
      throw new IllegalArgumentException("Wrong footer key length " + footerKey.length);
    }
    if (null != columnPropertyMap && columnPropertyMap.size() == 0) {
      throw new IllegalArgumentException("No encrypted columns");
    }

    SecureRandom random = new SecureRandom();
    byte[] aadFileUnique = new byte[AAD_FILE_UNIQUE_LENGTH];
    random.nextBytes(aadFileUnique);

    boolean supplyAadPrefix = false;
    if (null == aadPrefix) {
      this.fileAAD = aadFileUnique;
    } else {
      this.fileAAD = AesCipher.concatByteArrays(aadPrefix, aadFileUnique);
      if (!storeAadPrefixInFile) supplyAadPrefix = true;
    }

    this.algorithm = cipher.getEncryptionAlgorithm();

    if (algorithm.isSetAES_GCM_V1()) {
      algorithm.getAES_GCM_V1().setAad_file_unique(aadFileUnique);
      algorithm.getAES_GCM_V1().setSupply_aad_prefix(supplyAadPrefix);
      if (null != aadPrefix && storeAadPrefixInFile) {
        algorithm.getAES_GCM_V1().setAad_prefix(aadPrefix);
      }
    } else {
      algorithm.getAES_GCM_CTR_V1().setAad_file_unique(aadFileUnique);
      algorithm.getAES_GCM_CTR_V1().setSupply_aad_prefix(supplyAadPrefix);
      if (null != aadPrefix && storeAadPrefixInFile) {
        algorithm.getAES_GCM_CTR_V1().setAad_prefix(aadPrefix);
      }
    }

    this.footerKey = footerKey;
    this.footerKeyMetadata = footerKeyMetadata;
    this.encryptedFooter = encryptedFooter;
    this.columnPropertyMap = columnPropertyMap;
  }