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Signal Protocol cryptography library for Java

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//
// Copyright 2020-2021 Signal Messenger, LLC.
// SPDX-License-Identifier: AGPL-3.0-only
//

package org.signal.zkgroup.groups;

import java.security.SecureRandom;
import org.signal.zkgroup.InvalidInputException;
import org.signal.zkgroup.internal.ByteArray;
import org.signal.client.internal.Native;

import static org.signal.zkgroup.internal.Constants.RANDOM_LENGTH;

public final class GroupSecretParams extends ByteArray {

  public static GroupSecretParams generate() {
    return generate(new SecureRandom());
  }

  public static GroupSecretParams generate(SecureRandom secureRandom) {
    byte[] random      = new byte[RANDOM_LENGTH];
    secureRandom.nextBytes(random);

    byte[] newContents = Native.GroupSecretParams_GenerateDeterministic(random);

    try {
      return new GroupSecretParams(newContents);
    } catch (IllegalArgumentException e) {
      throw new AssertionError(e);
    } 
  }

  public static GroupSecretParams deriveFromMasterKey(GroupMasterKey groupMasterKey) {
    byte[] newContents = Native.GroupSecretParams_DeriveFromMasterKey(groupMasterKey.getInternalContentsForJNI());

    try {
      return new GroupSecretParams(newContents);
    } catch (IllegalArgumentException e) {
      throw new AssertionError(e);
    } 
  }

  public GroupSecretParams(byte[] contents)  {
    super(contents);
    Native.GroupSecretParams_CheckValidContents(contents);
  }

  public GroupMasterKey getMasterKey() {
    byte[] newContents = Native.GroupSecretParams_GetMasterKey(contents);

    try {
      return new GroupMasterKey(newContents);
    } catch (InvalidInputException e) {
      throw new AssertionError(e);
    }
  }

  public GroupPublicParams getPublicParams() {
    byte[] newContents = Native.GroupSecretParams_GetPublicParams(contents);

    try {
      return new GroupPublicParams(newContents);
    } catch (InvalidInputException e) {
      throw new AssertionError(e);
    }
  }

  public byte[] serialize() {
    return contents.clone();
  }

}