Examples of makwa.Makwa$DelegationContext

makwa.Makwa
An instance of this class represents a delegated Makwa computation. It contains the parameters which must be sent to the delegation server: modulus, value to square repeatedly, and number of squarings (the work factor). When the delegation server returns its answer (a big integer), the final hash value can be obtained (as bytes, or as an encoded string).

  }


  private void checkSimple(boolean preHash,
    int postHashLength, int workFactor)
  {
    Makwa mpub = new Makwa(modulus, Makwa.SHA256,
      preHash, postHashLength, workFactor);
    Makwa mpriv = new Makwa(privKey, Makwa.SHA256,
      preHash, postHashLength, workFactor);


    String h1 = mpub.hashNewPassword("test1");
    check(mpub.verifyPassword("test1", h1));
    check(mpriv.verifyPassword("test1", h1));
    check(!mpub.verifyPassword("test2", h1));
    check(!mpriv.verifyPassword("test2", h1));
    String h2 = mpriv.hashNewPassword("test1");
    check(mpub.verifyPassword("test1", h2));
    check(mpriv.verifyPassword("test1", h2));
    check(!mpub.verifyPassword("test2", h2));
    check(!mpriv.verifyPassword("test2", h2));


    // Since each hash value uses its own salt, the strings
    // ought to be different.
    check(!h1.equals(h2));
  }

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    check(!h1.equals(h2));
  }


  private void checkWFChange()
  {
    Makwa mpubSmall = new Makwa(modulus, Makwa.SHA256,
      false, 0, 384);
    Makwa mprivSmall = new Makwa(privKey, Makwa.SHA256,
      false, 0, 384);
    Makwa mpubLarge = new Makwa(modulus, Makwa.SHA256,
      false, 0, 4096);
    Makwa mprivLarge = new Makwa(privKey, Makwa.SHA256,
      false, 0, 4096);


    String hsmall = mpubSmall.hashNewPassword("test1");
    String hlarge = mpubSmall.setNewWorkFactor(hsmall, 4096);
    check(mprivLarge.verifyPassword("test1", hlarge));
    hlarge = mprivSmall.setNewWorkFactor(hsmall, 4096);
    check(mpubLarge.verifyPassword("test1", hlarge));
    hsmall = mprivLarge.setNewWorkFactor(hlarge, 384);
    check(mpubSmall.verifyPassword("test1", hsmall));
  }

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  }


  private void checkUnescrow()
    throws Exception
  {
    Makwa mpub = new Makwa(modulus, Makwa.SHA256,
      false, 0, 3072);
    Makwa mpriv = new Makwa(privKey, Makwa.SHA256,
      false, 0, 3072);


    String h = mpub.hashNewPassword("test1");
    check(equals("test1".getBytes("UTF-8"),
      mpriv.unescrow(h)));
  }

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  {
    MakwaDelegation md = MakwaDelegation.generate(
      PRIV2048, 4096);
    byte[] mdEnc = md.export();
    md = new MakwaDelegation(mdEnc);
    Makwa mpub = new Makwa(modulus, Makwa.SHA256,
      false, 0, 4096);
    Makwa mpriv = new Makwa(privKey, Makwa.SHA256,
      false, 0, 4096);


    Makwa.DelegationContext dc =
      mpub.hashNewPasswordDelegate("test1", md);
    byte[] req = dc.getRequest();
    byte[] ans = Makwa.processDelegationRequest(req);
    String h = dc.doFinalToString(ans);
    check(mpriv.verifyPassword("test1", h));


    dc = mpub.verifyPasswordDelegate("test1", h, md);
    req = dc.getRequest();
    ans = Makwa.processDelegationRequest(req);
    check(dc.doFinalVerify(ans));

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     * is no "PHC-compliant API" in Java. However, we can still
     * check a test vector.
     */
    byte[] salt = new byte[] { 1, 2, 3, 4 };
    byte[] input = "sample for PHC".getBytes("UTF-8");
    Makwa m = new Makwa(PHC_PUB2048, 0, false, 0, 4096);
    byte[] out = m.doHash(input, salt, true, 16, 8192);
    byte[] ref = new byte[] {
      (byte)0x1d, (byte)0x4f, (byte)0x1b, (byte)0x05,
      (byte)0x58, (byte)0xe9, (byte)0x60, (byte)0xce,
      (byte)0x11, (byte)0xad, (byte)0xd5, (byte)0x20,
      (byte)0xca, (byte)0x9e, (byte)0x28, (byte)0xf3

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    check(equals(out, ref));
  }


  private void speedTest()
  {
    Makwa mpub = new Makwa(modulus, Makwa.SHA256,
      false, 0, 4096);
    int wprev = 1;
    int w = 2;
    long ttprev = 0;
    byte[] input = new byte[9];
    for (;;) {
      long begin = System.currentTimeMillis();
      byte[] salt = Makwa.createSalt();
      mpub.doHash(input, salt, true, 16, w);
      long end = System.currentTimeMillis();
      long tt = end - begin;
      if (tt > 4000) {
        System.out.printf("wf/s = %.2f",
          (1000.0 * (w - wprev)) / (tt - ttprev));
        System.out.println();
        break;
      }
      ttprev = tt;
      wprev = w;
      w <<= 1;
    }


    Makwa mpriv = new Makwa(PRIV2048, 0, true, 16, 65536);
    String ref = mpriv.hashNewPassword("speedtest");
    int cc = 2;
    for (;;) {
      long begin = System.currentTimeMillis();
      for (int m = 0; m < cc; m ++) {
        mpriv.verifyPassword("speedtest", ref);
      }
      long end = System.currentTimeMillis();
      long tt = end - begin;
      if (tt > 4000) {
        System.out.printf("priv/s = %.2f",

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    }


    BigInteger mod = MakwaPrivateKey.decodePublic(PUB2048);
    MakwaPrivateKey pkey = new MakwaPrivateKey(PRIV2048);
    check(mod.equals(pkey.getModulus()));
    Makwa mpub = new Makwa(mod, Makwa.SHA256, false, 0, 1024);
    Makwa mpriv = new Makwa(pkey, Makwa.SHA256, false, 0, 1024);


    /*
     * Some KDF test vectors.
     */
    for (int i = 0; i < 200; i ++) {
      byte[] input = new byte[i];
      for (int j = 0; j < i; j ++) {
        input[j] = (byte)(7 * i + 83 * j);
      }
      printKDF("KDF/SHA-256", Makwa.SHA256, input, 100);
      printKDF("KDF/SHA-512", Makwa.SHA512, input, 100);
    }


    /*
     * The detailed test vector from the specification.
     */
    byte[] pi;
    try {
      String pwd = "Gego beshwaji'aaken awe makwa;"
        + " onzaam naniizaanizi.";
      pi = pwd.getBytes("UTF-8");
    } catch (Exception e) {
      throw new Error(e);
    }
    byte[] salt = new byte[] {
      (byte)0xC7, (byte)0x27, (byte)0x03, (byte)0xC2,
      (byte)0x2A, (byte)0x96, (byte)0xD9, (byte)0x99,
      (byte)0x2F, (byte)0x3D, (byte)0xEA, (byte)0x87,
      (byte)0x64, (byte)0x97, (byte)0xE3, (byte)0x92
    };
    byte[] ref = new byte[] {
      (byte)0xC9, (byte)0xCE, (byte)0xA0, (byte)0xE6,
      (byte)0xEF, (byte)0x09, (byte)0x39, (byte)0x3A,
      (byte)0xB1, (byte)0x71, (byte)0x0A, (byte)0x08
    };
    check(equals(ref, mpub.doHash(pi, salt, false, 12, 4096)));
    String detailed = mpub.encodeOutput(salt, false, 12, 4096, ref);
    System.out.println("2048-bit modulus, SHA-256");
    println("input", pi);
    println("salt", salt);
    System.out.println("pre-hashing: false");
    System.out.println("post-hashing: 12");
    println("bin4096", ref);
    System.out.println("str4096: " + detailed);
    System.out.println();


    sha256.update(ref);
    sha256.update(detailed.getBytes("UTF-8"));


    /*
     * A lot of test vectors of various sizes and parameters.
     */
    printKAT("2048-bit modulus, SHA-256", mpub, mpriv);


    mpub = new Makwa(mod, Makwa.SHA512, false, 0, 1024);
    mpriv = new Makwa(pkey, Makwa.SHA512, false, 0, 1024);
    printKAT("2048-bit modulus, SHA-512", mpub, mpriv);


    println("KAT digest", sha256.digest());
  }

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