Example usage for java.util Random nextBytes

Introduction

In this page you can find the example usage for java.util Random nextBytes.

Prototype

public void nextBytes(byte[] bytes) 

Source Link

Document

Generates random bytes and places them into a user-supplied byte array.

Usage

From source file:de.tavendo.autobahn.WebSocketConnection.java

/**
 * Create new key for WebSockets handshake.
 *
 * @return WebSockets handshake key (Base64 encoded).
 *///from ww  w .j a  v  a2 s .  c o  m
private String newHandshakeKey() {
    final Random mRng = new Random();

    final byte[] ba = new byte[16];
    mRng.nextBytes(ba);
    return Base64.encodeToString(ba, Base64.NO_WRAP);
}

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From source file:org.cesecore.util.PKIXCertRevocationStatusChecker.java

/**
 * Checks the revocation status of 'cert'; first by sending on OCSP request. If that fails for any reason, then through a CRL
 *///from w  w w  . ja va 2  s  . c  o  m
@Override
public void check(Certificate cert, Collection<String> unresolvedCritExts) throws CertPathValidatorException {

    clearResult();
    Certificate cacert = getCaCert(cert);
    if (cacert == null) {
        final String msg = "No issuer CA certificate was found. An issuer CA certificate is needed to create an OCSP request and to get the right CRL";
        log.info(msg);
        throw new CertPathValidatorException(msg);
    }

    ArrayList<String> ocspurls = getOcspUrls(cert);
    if (!ocspurls.isEmpty()) {
        BigInteger certSerialnumber = CertTools.getSerialNumber(cert);
        byte[] nonce = new byte[16];
        final Random randomSource = new Random();
        randomSource.nextBytes(nonce);
        OCSPReq req = null;
        try {
            req = getOcspRequest(cacert, certSerialnumber, nonce);
        } catch (CertificateEncodingException | OCSPException e) {
            if (log.isDebugEnabled()) {
                log.debug("Failed to create OCSP request. " + e.getLocalizedMessage());
            }
            fallBackToCrl(cert, CertTools.getSubjectDN(cacert));
            return;

        }

        SingleResp ocspResp = null;
        for (String url : ocspurls) {
            ocspResp = getOCSPResponse(url, req, cert, nonce, OCSPRespBuilder.SUCCESSFUL, 200);
            if (ocspResp != null) {
                log.info("Obtained OCSP response from " + url);
                break;
            } else {
                if (log.isDebugEnabled()) {
                    log.debug("Failed to obtain an OCSP reponse from " + url);
                }
            }
        }

        if (ocspResp == null) {
            log.info(
                    "Failed to check certificate revocation status using OCSP. Falling back to check using CRL");
            fallBackToCrl(cert, CertTools.getSubjectDN(cacert));
        } else {
            CertificateStatus status = ocspResp.getCertStatus();
            this.ocspResponse = ocspResp;
            if (log.isDebugEnabled()) {
                log.debug("The certificate status is: " + (status == null ? "Good" : status.toString()));
            }
            if (status != null) { // status==null -> certificate OK
                throw new CertPathValidatorException("Certificate with serialnumber "
                        + CertTools.getSerialNumberAsString(cert) + " was revoked");
            }

            if (unresolvedCritExts != null) {
                unresolvedCritExts.remove(Extension.authorityInfoAccess.getId());
            }
        }

    } else {
        fallBackToCrl(cert, CertTools.getSubjectDN(cacert));

        if (unresolvedCritExts != null) {
            unresolvedCritExts.remove(Extension.cRLDistributionPoints.getId());
        }
    }

}

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From source file:edu.unc.lib.dl.admin.collect.DepositBinCollectorTest.java

private void populateFile(File file, long numberBytes) throws Exception {
    int byteLength = 512;

    Random random = new Random();
    long bytesRemaining = numberBytes;

    try (OutputStream fos = new FileOutputStream(file)) {
        for (; bytesRemaining > byteLength; bytesRemaining = bytesRemaining - byteLength) {
            byte bytes[] = new byte[byteLength];
            random.nextBytes(bytes);
            fos.write(bytes);//from www. ja v  a  2  s  . com
        }

        if (bytesRemaining > 0) {
            byte bytes[] = new byte[(int) bytesRemaining];
            random.nextBytes(bytes);
            fos.write(bytes);
        }
    }
}

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From source file:jetbrains.buildServer.clouds.azure.connector.AzureApiConnector.java

public AzureApiConnector(@NotNull final String subscriptionId, @NotNull final String managementCertificate)
        throws InvalidCertificateException {
    mySubscriptionId = subscriptionId;/*w w w  .  jav a 2  s  .c o m*/
    myKeyStoreType = KeyStoreType.pkcs12;
    FileOutputStream fOut;
    final String base64pw;
    final File tempFile;
    try {
        tempFile = File.createTempFile("azk", null);
        fOut = new FileOutputStream(tempFile);
        Random r = new Random();
        byte[] pwdData = new byte[4];
        r.nextBytes(pwdData);
        base64pw = Base64.encode(pwdData).substring(0, 6);
    } catch (IOException e) {
        LOG.warn("An exception while trying to create an API connector", e);
        throw new RuntimeException(e);
    }

    try {
        createKeyStorePKCS12(managementCertificate, fOut, base64pw);
    } catch (Exception e) {
        throw new InvalidCertificateException(e);
    }
    initClient(tempFile, base64pw);

}

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From source file:com.google.cloud.dataflow.sdk.io.CompressedSourceTest.java

/**
 * Generate byte array of given size./*w ww .ja  va  2  s. co  m*/
 */
private byte[] generateInput(int size) {
    // Arbitrary but fixed seed
    Random random = new Random(285930);
    byte[] buff = new byte[size];
    random.nextBytes(buff);
    return buff;
}

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From source file:org.apache.flink.runtime.state.DuplicatingCheckpointOutputStreamTest.java

/**
 * Test that all writes are duplicated to both streams and that the state reflects what was written.
 */// ww w .  ja  v a2  s. co m
@Test
public void testDuplicatedWrite() throws Exception {
    int streamCapacity = 1024 * 1024;
    TestMemoryCheckpointOutputStream primaryStream = new TestMemoryCheckpointOutputStream(streamCapacity);
    TestMemoryCheckpointOutputStream secondaryStream = new TestMemoryCheckpointOutputStream(streamCapacity);
    TestMemoryCheckpointOutputStream referenceStream = new TestMemoryCheckpointOutputStream(streamCapacity);
    DuplicatingCheckpointOutputStream duplicatingStream = new DuplicatingCheckpointOutputStream(primaryStream,
            secondaryStream, 64);
    Random random = new Random(42);
    for (int i = 0; i < 500; ++i) {
        int choice = random.nextInt(3);
        if (choice == 0) {
            int val = random.nextInt();
            referenceStream.write(val);
            duplicatingStream.write(val);
        } else {
            byte[] bytes = new byte[random.nextInt(128)];
            random.nextBytes(bytes);
            if (choice == 1) {
                referenceStream.write(bytes);
                duplicatingStream.write(bytes);
            } else {
                int off = bytes.length > 0 ? random.nextInt(bytes.length) : 0;
                int len = bytes.length > 0 ? random.nextInt(bytes.length - off) : 0;
                referenceStream.write(bytes, off, len);
                duplicatingStream.write(bytes, off, len);
            }
        }
        Assert.assertEquals(referenceStream.getPos(), duplicatingStream.getPos());
    }

    StreamStateHandle refStateHandle = referenceStream.closeAndGetHandle();
    StreamStateHandle primaryStateHandle = duplicatingStream.closeAndGetPrimaryHandle();
    StreamStateHandle secondaryStateHandle = duplicatingStream.closeAndGetSecondaryHandle();

    Assert.assertTrue(CommonTestUtils.isSteamContentEqual(refStateHandle.openInputStream(),
            primaryStateHandle.openInputStream()));

    Assert.assertTrue(CommonTestUtils.isSteamContentEqual(refStateHandle.openInputStream(),
            secondaryStateHandle.openInputStream()));

    refStateHandle.discardState();
    primaryStateHandle.discardState();
    secondaryStateHandle.discardState();
}

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From source file:info.jtrac.JtracImpl.java

/**
 * this has not been factored into the util package or a helper class
 * because it depends on the PasswordEncoder configured
 *///w  ww  . ja  v a 2s.c  om
public String generatePassword() {
    byte[] ab = new byte[1];
    Random r = new Random();
    r.nextBytes(ab);
    return passwordEncoder.encodePassword(new String(ab), null).substring(24);
}

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From source file:org.mn.z80util.testbench.MZ80TestBench.java

public void run() {

    /*//ww w.  j  ava  2 s .  c o  m
     * 0x00-0xff   Normal commands.
     * 0x100-0x1ff   IX-prefixed commands.
     * 0x200-0x2ff   IY-prefixed commands.
     * 0x300-0x3ff   CBh-prefixed commands.
     * 0x400-0x4ff   IX/CBh
     * 0x500-0x5ff   IY/CBh
     * 0x600-0x6ff   EDh-prefixed commands.
     */
    for (cmdno = 0x00; cmdno < 0x6c0; cmdno++) {
        commandselect: {
            /* Omissions */
            switch (cmdno) {
            case 0xcb:
            case 0xdd:
            case 0xed:
            case 0xfd:
            case 0x1cb:
            case 0x1dd:
            case 0x1ed:
            case 0x1fd:
            case 0x2cb:
            case 0x2dd:
            case 0x2ed:
            case 0x2fd:
            case 0x65f: // to avoid messing with R-register
            case 0x677:
            case 0x67f:
                break commandselect;
            }

            /* To avoid illegal EDh zeroth page */
            if ((cmdno >= 0x600) && (cmdno < 0x640)) {
                break commandselect;
            }

            /* To avoid illegal commands on EDh second page */
            if ((cmdno >= 0x680) && (cmdno < 0x6c0) && (((cmdno & 7) >= 4) || (((cmdno & 0070) >> 3) < 4))) {
                break commandselect;
            }

            for (int j = 0; j < sameCommandRounds; j++) {
                byte[] memory = ula.getMemory();
                Random rand = new Random(System.nanoTime());
                rand.nextBytes(memory);
                processor1.reset();
                processor1.setRegPair(TestZ80.PC, (short) 0x8000);
                processor1.setRegPair(TestZ80.SP, (short) 0x7ffe);

                /* Sets up the command to be tested. */
                if (cmdno < 0x100) {
                    ula.setByte((short) 0x8000, (byte) cmdno);
                } else if (cmdno < 0x200) {
                    ula.setByte((short) 0x8000, (byte) 0xdd);
                    ula.setByte((short) 0x8001, (byte) cmdno);
                } else if (cmdno < 0x300) {
                    ula.setByte((short) 0x8000, (byte) 0xfd);
                    ula.setByte((short) 0x8001, (byte) cmdno);
                } else if (cmdno < 0x400) {
                    ula.setByte((short) 0x8000, (byte) 0xcb);
                    ula.setByte((short) 0x8001, (byte) cmdno);
                } else if (cmdno < 0x500) {
                    ula.setByte((short) 0x8000, (byte) 0xdd);
                    ula.setByte((short) 0x8001, (byte) 0xcb);
                    ula.setByte((short) 0x8003, (byte) cmdno);
                } else if (cmdno < 0x600) {
                    ula.setByte((short) 0x8000, (byte) 0xfd);
                    ula.setByte((short) 0x8001, (byte) 0xcb);
                    ula.setByte((short) 0x8003, (byte) cmdno);
                } else {
                    ula.setByte((short) 0x8000, (byte) 0xed);
                    ula.setByte((short) 0x8001, (byte) cmdno);
                }

                dar = Disassembler.disassemble(ula.getMemory(), (short) 0x8000);

                /* Takes snapshot as this setup is to be applied to the other
                 * processor also. */
                byte[] initialBackup = createSnap(processor1, ula);

                /* Executes the command on both processors and collects results. */
                processor1.setHaltState(false);
                processor1.executeNextCommand();
                result1 = createSnap(processor1, ula);
                applySnap(initialBackup, processor2, ula);
                processor2.setHaltState(false);
                processor2.executeNextCommand();
                result2 = createSnap(processor2, ula);

                if (wantGui) {
                    reportResultsToGUI();
                } else {
                    reportResults();
                }

                if (fail_this) {
                    return;
                }

            } // for j=...
        } // commandselect

        switch ((cmdno & 0x700) >> 8) {
        case 0:
            msgString = "Testing normal commands";
            break;
        case 1:
            msgString = "Testing IX-prefixed commands.";
            break;
        case 2:
            msgString = "Testing IY-prefixed commands.";
            break;
        case 3:
            msgString = "Testing CBh-prefixed commands.";
            break;
        case 4:
            msgString = "Testing IX-CBh-prefixed commands.";
            break;
        case 5:
            msgString = "Testing IY-CBh-prefixed commands.";
            break;
        case 6:
            msgString = "Testing EDh-prefixed commands.";
            break;
        }

        if (wantGui) {
            SwingUtilities.invokeLater(new Runnable() {
                public void run() {
                    progressBar.setValue(cmdno);
                    statusMessage.setText(msgString);
                }
            });
        } else if ((cmdno & 7) == 0) {
            if ((cmdno & 0xff) == 0) {
                System.out.println();
                System.out.println(msgString);
            }
            System.out.print(".");
        }
    } // for cmdno=...

    if (wantGui) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                statusMessage.setText("Processors are compatible with each other.");
                okCancelButton.setText("OK");
            }
        });
    } else {
        System.out.println("\nOK.");
    }
}

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From source file:org.cryptomator.crypto.aes256.Aes256Cryptor.java

/**
 * Creates a new Cryptor with the given PRNG.<br/>
 * <strong>DO NOT USE IN PRODUCTION</strong>. This constructor must only be used in in unit tests. Do not change method visibility.
 * //from   w w w.  jav  a  2s.  co  m
 * @param prng Fast, possibly insecure PRNG.
 */
Aes256Cryptor(Random prng) {
    byte[] bytes = new byte[AES_KEY_LENGTH_IN_BITS / Byte.SIZE];
    try {
        prng.nextBytes(bytes);
        this.primaryMasterKey = new SecretKeySpec(bytes, AES_KEY_ALGORITHM);

        prng.nextBytes(bytes);
        this.hMacMasterKey = new SecretKeySpec(bytes, HMAC_KEY_ALGORITHM);
    } finally {
        Arrays.fill(bytes, (byte) 0);
    }
}

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From source file:org.apache.jackrabbit.core.data.TestCaseBase.java

/**
 * Test {@link MultiDataStoreAware#deleteRecord(DataIdentifier)}.
 *//*from w w w. ja  v a  2 s. c  om*/
protected void doDeleteRecordTest() throws Exception {
    ds = createDataStore();
    Random random = randomGen;
    byte[] data1 = new byte[dataLength];
    random.nextBytes(data1);
    DataRecord rec1 = ds.addRecord(new ByteArrayInputStream(data1));

    byte[] data2 = new byte[dataLength];
    random.nextBytes(data2);
    DataRecord rec2 = ds.addRecord(new ByteArrayInputStream(data2));

    byte[] data3 = new byte[dataLength];
    random.nextBytes(data3);
    DataRecord rec3 = ds.addRecord(new ByteArrayInputStream(data3));

    ds.deleteRecord(rec2.getIdentifier());

    assertNull("rec2 should be null", ds.getRecordIfStored(rec2.getIdentifier()));
    assertEquals(new ByteArrayInputStream(data1), ds.getRecord(rec1.getIdentifier()).getStream());
    assertEquals(new ByteArrayInputStream(data3), ds.getRecord(rec3.getIdentifier()).getStream());
    ds.close();
}

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