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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.receipts;

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

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

public class ServerZkReceiptOperations {

  private final ServerSecretParams serverSecretParams;

  public ServerZkReceiptOperations(ServerSecretParams serverSecretParams) {
    this.serverSecretParams = serverSecretParams;
  }

  public ReceiptCredentialResponse issueReceiptCredential(ReceiptCredentialRequest receiptCredentialRequest, long receiptExpirationTime, long receiptLevel) throws VerificationFailedException {
    return issueReceiptCredential(new SecureRandom(), receiptCredentialRequest, receiptExpirationTime, receiptLevel);
  }

  public ReceiptCredentialResponse issueReceiptCredential(SecureRandom secureRandom, ReceiptCredentialRequest receiptCredentialRequest, long receiptExpirationTime, long receiptLevel) throws VerificationFailedException {
    byte[] random      = new byte[RANDOM_LENGTH];
    secureRandom.nextBytes(random);

    byte[] newContents = Native.ServerSecretParams_IssueReceiptCredentialDeterministic(serverSecretParams.getInternalContentsForJNI(), random, receiptCredentialRequest.getInternalContentsForJNI(), receiptExpirationTime, receiptLevel);

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

  public void verifyReceiptCredentialPresentation(ReceiptCredentialPresentation receiptCredentialPresentation) throws VerificationFailedException {
    Native.ServerSecretParams_VerifyReceiptCredentialPresentation(serverSecretParams.getInternalContentsForJNI(), receiptCredentialPresentation.getInternalContentsForJNI());
  }

}