Example usage for java.util.zip CRC32 CRC32

Introduction

In this page you can find the example usage for java.util.zip CRC32 CRC32.

Prototype

public CRC32() 

Source Link

Document

Creates a new CRC32 object.

Usage

From source file:com.bitbreeds.webrtc.stun.StunMessage.java

public void validate(String pass, byte[] data) {
    StunAttribute fingerprint = this.attributeSet.remove(StunAttributeTypeEnum.FINGERPRINT);
    String finger = new String(fingerprint.getData());
    byte[] fingerprintData = Arrays.copyOfRange(data, 0, data.length - fingerprint.getLength() - 4);
    final CRC32 crc = new CRC32();
    crc.update(fingerprintData);/*  ww  w. ja v  a  2 s .c o  m*/
    String comp = new String(SignalUtil.xor(SignalUtil.fourBytesFromInt((int) crc.getValue()),
            new byte[] { 0x53, 0x54, 0x55, 0x4e }));

    if (!comp.equals(finger)) {
        throw new StunError("Fingerprint bad, computed=" + comp + " sent=" + finger);
    }

    StunAttribute integrity = attributeSet.remove(StunAttributeTypeEnum.MESSAGE_INTEGRITY);

    byte[] integrityData = Arrays.copyOfRange(data, 0,
            data.length - fingerprint.getLength() - integrity.getLength() - 8);
    byte[] lgt = SignalUtil.twoBytesFromInt(fingerprintData.length - 20);
    integrityData[2] = lgt[0];
    integrityData[3] = lgt[1];

    byte[] mac = SignalUtil.hmacSha1(integrityData, pass.getBytes());

    if (!Arrays.equals(mac, integrity.getData())) {
        throw new StunError("Integrity bad, computed=" + Hex.encodeHexString(mac) + " sent="
                + Hex.encodeHexString(integrity.getData()));
    }
}

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From source file:org.smartfrog.services.www.bulkio.client.SunJavaBulkIOClient.java

@Override
public long doDownload(long ioSize) throws IOException, InterruptedException {
    validateURL();//from w  ww.j a  v  a 2  s  .  c om
    URL target = createFullURL(ioSize, format);
    getLog().info("Downloading " + ioSize + " bytes from " + target);
    CRC32 checksum = new CRC32();
    HttpURLConnection connection = openConnection(target);
    connection.setRequestMethod(HttpAttributes.METHOD_GET);
    connection.setDoOutput(false);
    connection.connect();
    checkStatusCode(target, connection, HttpURLConnection.HTTP_OK);
    String contentLengthHeader = connection.getHeaderField(HttpHeaders.CONTENT_LENGTH);
    long contentLength = Long.parseLong(contentLengthHeader);
    if (contentLength != ioSize) {
        throw new IOException("Wrong content length returned from " + target + " - expected " + ioSize
                + " but got " + contentLength);
    }
    String formatHeader = connection.getHeaderField(HttpHeaders.CONTENT_TYPE);
    if (!format.equals(formatHeader)) {
        throw new IOException("Wrong content type returned from " + target + " - expected " + format
                + " but got " + formatHeader);
    }
    InputStream stream = connection.getInputStream();
    long bytes = 0;
    try {
        for (bytes = 0; bytes < ioSize; bytes++) {
            int octet = stream.read();
            checksum.update(octet);
            if (interrupted) {
                throw new InterruptedException(
                        "Interrupted after reading" + bytes + " bytes" + " from " + target);
            }
        }
    } finally {
        closeQuietly(stream);
    }
    long actualChecksum = checksum.getValue();
    getLog().info("Download finished after " + bytes + " bytes, checksum=" + actualChecksum);
    if (bytes != ioSize) {
        throw new IOException("Wrong content length downloaded from " + target + " - requested " + ioSize
                + " but got " + bytes);
    }
    if (expectedChecksumFromGet >= 0 && expectedChecksumFromGet != actualChecksum) {
        throw new IOException("Wrong checksum from download of " + ioSize + " bytes " + " from " + target
                + " expected " + expectedChecksumFromGet + " but got " + actualChecksum);
    }
    return bytes;
}

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From source file:it.jnrpe.net.JNRPEProtocolPacket.java

/**
 * Validates the packet CRC./*from www .j a  v a 2  s . c om*/
 * 
 * @throws BadCRCException
 *             If the CRC can't be validated 
 */
public void validate() throws BadCRCException {
    ByteArrayOutputStream bout = new ByteArrayOutputStream();
    DataOutputStream dout = new DataOutputStream(bout);

    try {
        dout.writeShort(packetVersion);
        dout.writeShort(packetTypeCode);
        dout.writeInt(0); // NO CRC
        dout.writeShort(resultCode);
        dout.write(byteBufferAry);
        dout.write(dummyBytesAry);

        dout.close();

        byte[] vBytes = bout.toByteArray();

        CRC32 crcAlg = new CRC32();
        crcAlg.update(vBytes);

        if (!(((int) crcAlg.getValue()) == crcValue)) {
            throw new BadCRCException("Bad CRC");
        }
    } catch (IOException e) {
        // Never happens...
        throw new IllegalStateException(e.getMessage(), e);
    }
}

---

From source file:org.mariotaku.twidere.util.TwitterContentUtils.java

public static boolean isOfficialKey(final Context context, final String consumerKey,
        final String consumerSecret) {
    if (context == null || consumerKey == null || consumerSecret == null)
        return false;
    final String[] keySecrets = context.getResources()
            .getStringArray(R.array.values_official_consumer_secret_crc32);
    final CRC32 crc32 = new CRC32();
    final byte[] consumerSecretBytes = consumerSecret.getBytes(Charset.forName("UTF-8"));
    crc32.update(consumerSecretBytes, 0, consumerSecretBytes.length);
    final long value = crc32.getValue();
    crc32.reset();//from  www. jav  a  2  s.c  om
    for (final String keySecret : keySecrets) {
        if (Long.parseLong(keySecret, 16) == value)
            return true;
    }
    return false;
}

---

From source file:com.hortonworks.registries.storage.tool.shell.ShellMigrationResolver.java

/**
 * Calculates the checksum of these bytes.
 *
 * @param bytes The bytes to calculate the checksum for.
 * @return The crc-32 checksum of the bytes.
 *///from w  ww.  ja  v a 2 s .co m
private static int calculateChecksum(byte[] bytes) {
    final CRC32 crc32 = new CRC32();
    crc32.update(bytes);
    return (int) crc32.getValue();
}

---

From source file:it.reexon.lib.files.FileUtils.java

/**
 * Utility method for copying file /*from w  ww.j  a v a2s .  c o  m*/
 *  
 * @param srcFile - source file 
 * @param destFile - destination file 
 * @author A. Weinberger
 * 
 * @throws IOException              If the first byte cannot be read for any reason other than the end of the file, if the input stream has been closed, or if some other I/O error occurs.
 * @throws IllegalArgumentException If file are null
 * @throws FileNotFoundException    If srcFile doens't exist
 */
public static void copyFile(File srcFile, File destFile) throws IOException {
    if (srcFile == null || destFile == null)
        throw new IllegalArgumentException("Files cannot be null");
    if (!srcFile.exists())
        throw new FileNotFoundException("Start file must be exists");

    try (final InputStream in = new FileInputStream(srcFile);
            final OutputStream out = new FileOutputStream(destFile);) {
        long millis = System.currentTimeMillis();
        CRC32 checksum;
        if (VERIFY) {
            checksum = new CRC32();
            checksum.reset();
        }
        final byte[] buffer = new byte[BUFFER_SIZE];
        int bytesRead = in.read(buffer);
        while (bytesRead >= 0) {
            if (VERIFY) {
                checksum.update(buffer, 0, bytesRead);
            }
            out.write(buffer, 0, bytesRead);
            bytesRead = in.read(buffer);
        }
        if (CLOCK) {
            millis = System.currentTimeMillis() - millis;
            if (LOGS)
                System.out.println("Copy file '" + srcFile.getPath() + "' on " + millis / 1000L + " second(s)");
        }
    } catch (IOException e) {
        throw e;
    }
}

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From source file:org.apache.isis.objectstore.nosql.db.file.FileServerDb.java

private String checkData(final String data) {
    final String objectData = data.substring(8);

    final CRC32 inputChecksum = new CRC32();
    inputChecksum.update(objectData.getBytes());
    final long actualChecksum = inputChecksum.getValue();

    final String encodedChecksum = data.substring(0, 8);
    final long expectedChecksum = Long.valueOf(encodedChecksum, 16);

    if (actualChecksum != expectedChecksum) {
        throw new NoSqlStoreException("Data integrity error; checksums different");
    }/*  w w w.  j  a  v  a  2  s . com*/

    return objectData;
}

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From source file:org.apache.hadoop.dfs.TestDFSUpgradeFromImage.java

private void verifyDir(DFSClient client, String dir) throws IOException {

    DFSFileInfo[] fileArr = client.listPaths(dir);
    TreeMap<String, Boolean> fileMap = new TreeMap<String, Boolean>();

    for (DFSFileInfo file : fileArr) {
        String path = file.getPath().toString();
        fileMap.put(path, Boolean.valueOf(file.isDir()));
    }/*www.  ja  v  a 2  s.c  o  m*/

    for (Iterator<String> it = fileMap.keySet().iterator(); it.hasNext();) {
        String path = it.next();
        boolean isDir = fileMap.get(path);

        overallChecksum.update(path.getBytes());

        if (isDir) {
            verifyDir(client, path);
        } else {
            // this is not a directory. Checksum the file data.
            CRC32 fileCRC = new CRC32();
            FSInputStream in = client.open(path);
            byte[] buf = new byte[4096];
            int nRead = 0;
            while ((nRead = in.read(buf, 0, buf.length)) > 0) {
                fileCRC.update(buf, 0, nRead);
            }

            verifyChecksum(path, fileCRC.getValue());
        }
    }
}

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From source file:org.nuxeo.template.odt.OOoArchiveModifier.java

protected void writeOOoEntry(ZipOutputStream zipOutputStream, String entryName, File fileEntry, int zipMethod)
        throws IOException {

    if (fileEntry.isDirectory()) {
        entryName = entryName + "/";
        ZipEntry zentry = new ZipEntry(entryName);
        zipOutputStream.putNextEntry(zentry);
        zipOutputStream.closeEntry();/*from  ww w . ja  va 2s  .c om*/
        for (File child : fileEntry.listFiles()) {
            writeOOoEntry(zipOutputStream, entryName + child.getName(), child, zipMethod);
        }
        return;
    }

    ZipEntry zipEntry = new ZipEntry(entryName);
    try (InputStream entryInputStream = new FileInputStream(fileEntry)) {
        zipEntry.setMethod(zipMethod);
        if (zipMethod == ZipEntry.STORED) {
            byte[] inputBytes = IOUtils.toByteArray(entryInputStream);
            CRC32 crc = new CRC32();
            crc.update(inputBytes);
            zipEntry.setCrc(crc.getValue());
            zipEntry.setSize(inputBytes.length);
            zipEntry.setCompressedSize(inputBytes.length);
            zipOutputStream.putNextEntry(zipEntry);
            IOUtils.write(inputBytes, zipOutputStream);
        } else {
            zipOutputStream.putNextEntry(zipEntry);
            IOUtils.copy(entryInputStream, zipOutputStream);
        }
    }
    zipOutputStream.closeEntry();
}

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From source file:nl.nn.adapterframework.compression.ZipWriter.java

public void writeEntryWithCompletedHeader(String filename, Object contents, boolean close, String charset)
        throws CompressionException, IOException {
    if (StringUtils.isEmpty(filename)) {
        throw new CompressionException("filename cannot be empty");
    }/* www .  j  a  va 2 s. c o m*/

    byte[] contentBytes = null;
    BufferedInputStream bis = null;
    long size = 0;
    if (contents != null) {
        if (contents instanceof byte[]) {
            contentBytes = (byte[]) contents;
        } else if (contents instanceof InputStream) {
            contentBytes = Misc.streamToBytes((InputStream) contents);
        } else {
            contentBytes = contents.toString().getBytes(charset);
        }
        bis = new BufferedInputStream(new ByteArrayInputStream(contentBytes));
        size = bis.available();
    } else {
        log.warn("contents of zip entry [" + filename + "] is null");
    }

    int bytesRead;
    byte[] buffer = new byte[1024];
    CRC32 crc = new CRC32();
    crc.reset();
    if (bis != null) {
        while ((bytesRead = bis.read(buffer)) != -1) {
            crc.update(buffer, 0, bytesRead);
        }
        bis.close();
    }
    if (contents != null) {
        bis = new BufferedInputStream(new ByteArrayInputStream(contentBytes));
    }
    ZipEntry entry = new ZipEntry(filename);
    entry.setMethod(ZipEntry.STORED);
    entry.setCompressedSize(size);
    entry.setSize(size);
    entry.setCrc(crc.getValue());
    getZipoutput().putNextEntry(entry);
    if (bis != null) {
        while ((bytesRead = bis.read(buffer)) != -1) {
            getZipoutput().write(buffer, 0, bytesRead);
        }
        bis.close();
    }
    getZipoutput().closeEntry();
}

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