Example usage for java.security DigestInputStream DigestInputStream

Introduction

In this page you can find the example usage for java.security DigestInputStream DigestInputStream.

Prototype

public DigestInputStream(InputStream stream, MessageDigest digest) 

Source Link

Document

Creates a digest input stream, using the specified input stream and message digest.

Usage

From source file:MainClass.java

static private String computeDigest(MessageDigest algorithm, String filename) {
    String returnValue = "";
    try {/*from   w ww . ja v a 2 s  . co m*/
        algorithm.reset();
        FileInputStream fis = new FileInputStream(filename);
        BufferedInputStream bis = new BufferedInputStream(fis);
        DigestInputStream dis = new DigestInputStream(bis, algorithm);
        int ch;
        while ((ch = dis.read()) != -1)
            ;
        StringBuffer hexString = new StringBuffer();
        byte digest[] = algorithm.digest();
        int digestLength = digest.length;
        for (int i = 0; i < digestLength; i++) {
            hexString.append(hexDigit(digest[i]));
            hexString.append(" ");
        }
        returnValue = hexString.toString();
    } catch (IOException e) {
        System.err.println("Error generating digest for: " + filename);
    }
    return returnValue;
}

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From source file:Main.java

public static String calcHash(File file, String algo) throws Exception {
    MessageDigest digester = MessageDigest.getInstance(algo);

    FileInputStream is = new FileInputStream(file);
    DigestInputStream dis;/*w w  w.  j  a  v a 2s.c  o m*/
    try {
        dis = new DigestInputStream(is, digester);

        for (byte[] buffer = new byte[1024 * 4]; dis.read(buffer) >= 0;) {
            // just read it
        }
    } finally {
        is.close();
    }

    byte[] digest = digester.digest();

    StringBuffer hash = new StringBuffer(digest.length * 2);

    for (int i = 0; i < digest.length; i++) {
        int b = digest[i] & 0xFF;

        if (b < 0x10) {
            hash.append('0');
        }

        hash.append(Integer.toHexString(b));
    }

    return hash.toString();
}

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From source file:Main.java

private static String computeHash(InputStream dataStream) throws IOException, NoSuchAlgorithmException {
    MessageDigest messageDigest = null;
    DigestInputStream digestInputStream = null;
    try {//from  w w  w .j a  v a 2s .c om
        messageDigest = MessageDigest.getInstance("SHA-256");
        digestInputStream = new DigestInputStream(dataStream, messageDigest);
        byte[] byteBuffer = new byte[1024 * 8];
        while (digestInputStream.read(byteBuffer) != -1)
            ;
    } finally {
        try {
            if (digestInputStream != null)
                digestInputStream.close();
            if (dataStream != null)
                dataStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    byte[] hash = messageDigest.digest();
    return String.format("%064x", new java.math.BigInteger(1, hash));
}

---

From source file:org.m1theo.apt.repo.utils.Utils.java

/**
 * Compute the given message digest for a file.
 * // w  ww  .  j a  v a2s .com
 * @param hashType algorithm to be used (as {@code String})
 * @param file File to compute the digest for (as {@code File}).
 * @return A {@code String} for the hex encoded digest.
 * @throws AptRepoException
 */
public static String getDigest(String hashType, File file) throws AptRepoException {
    try {
        FileInputStream fis = new FileInputStream(file);
        BufferedInputStream bis = new BufferedInputStream(fis);
        MessageDigest digest = MessageDigest.getInstance(hashType);
        DigestInputStream dis = new DigestInputStream(bis, digest);
        @SuppressWarnings("unused")
        int ch;
        while ((ch = dis.read()) != -1)
            ;
        String hex = new String(Hex.encodeHex(digest.digest()));
        fis.close();
        bis.close();
        dis.close();
        return hex;
    } catch (NoSuchAlgorithmException e) {
        throw new AptRepoException("could not create digest", e);
    } catch (FileNotFoundException e) {
        throw new AptRepoException("could not create digest", e);
    } catch (IOException e) {
        throw new AptRepoException("could not create digest", e);
    }
}

---

From source file:com.codemarvels.ant.aptrepotask.utils.Utils.java

/**
 * Compute the given message digest for a file.
 * //from   ww w  .  jav  a  2 s  . c o  m
 * @param hashType algorithm to be used (as {@code String})
 * @param file File to compute the digest for (as {@code File}).
 * @return A {@code String} for the hex encoded digest.
 * @throws MojoExecutionException
 */
public static String getDigest(String hashType, File file) {
    try {
        FileInputStream fis = new FileInputStream(file);
        BufferedInputStream bis = new BufferedInputStream(fis);
        MessageDigest digest = MessageDigest.getInstance(hashType);
        DigestInputStream dis = new DigestInputStream(bis, digest);
        @SuppressWarnings("unused")
        int ch;
        while ((ch = dis.read()) != -1)
            ;
        String hex = new String(Hex.encodeHex(digest.digest()));
        fis.close();
        bis.close();
        dis.close();
        return hex;
    } catch (NoSuchAlgorithmException e) {
        throw new RuntimeException("could not create digest", e);
    } catch (FileNotFoundException e) {
        throw new RuntimeException("could not create digest", e);
    } catch (IOException e) {
        throw new RuntimeException("could not create digest", e);
    }
}

---

From source file:org.apache.sling.distribution.util.impl.DigestUtils.java

public static DigestInputStream openDigestInputStream(InputStream mainInputStream, String digestAlgorithm) {
    return new DigestInputStream(mainInputStream, getDigest(digestAlgorithm));
}

---

From source file:com.amazonaws.encryptionsdk.internal.TestIOUtils.java

public static byte[] computeFileDigest(final String fileName) throws IOException {
    try {//from  ww w. ja v a2s  .  c om
        final FileInputStream fis = new FileInputStream(fileName);
        final MessageDigest md = MessageDigest.getInstance("SHA-256");
        final DigestInputStream dis = new DigestInputStream(fis, md);

        final int readLen = 128;
        final byte[] readBytes = new byte[readLen];
        while (dis.read(readBytes) != -1) {
        }
        dis.close();

        return md.digest();
    } catch (NoSuchAlgorithmException e) {
        // shouldn't get here since we hardcode the algorithm.
    }

    return null;
}

---

From source file:org.abstracthorizon.proximity.metadata.FileDigest.java

/**
 * Gets the file digest./*w w  w.j  a v  a2 s.c  o m*/
 * 
 * @param file the file
 * @param alg the alg
 * 
 * @return the file digest
 */
public static byte[] getFileDigest(File file, String alg) {
    byte[] result;
    try {
        MessageDigest dalg = MessageDigest.getInstance(alg);
        FileInputStream fis = null;
        DigestInputStream dis = null;
        try {
            fis = new FileInputStream(file);
            DevNullOutputStream fos = new DevNullOutputStream();
            dis = new DigestInputStream(fis, dalg);
            IOUtils.copy(dis, fos);
            result = dalg.digest();
        } finally {
            if (dis != null) {
                dis.close();
            }
            if (fis != null) {
                fis.close();
            }
        }
        return result;
    } catch (Exception ex) {
        return null;
    }
}

---

From source file:edu.ku.brc.specify.plugins.ipadexporter.MD5Checksum.java

/**
 * @param file// w  w  w  .j  av a2 s.c  om
 * @return
 * @throws Exception
 */
public static String getMD5Checksum(final File file) throws Exception {
    MessageDigest md = MessageDigest.getInstance("MD5");
    md.reset();
    InputStream fis = new FileInputStream(file);
    try {
        //ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(fis);
        DigestInputStream digestInputStream = new DigestInputStream(fis, md);
        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        int ch;
        while ((ch = digestInputStream.read()) >= 0) {
            byteArrayOutputStream.write(ch);
        }

        byte[] newInput = byteArrayOutputStream.toByteArray();
        return org.apache.commons.codec.digest.DigestUtils.md5Hex(newInput);
    } finally {
        fis.close();
    }
}

---

From source file:pl.nask.hsn2.service.Md5HashGenerator.java

private static String md5hashFromFile(BufferedInputStream bufferedInputStream) throws IOException {
    bufferedInputStream.reset();/*  ww w. j a  v  a2 s.  c o m*/
    String result = null;
    MessageDigest md;
    try {
        md = MessageDigest.getInstance("MD5");
        md.reset();
        try (InputStream dis = new DigestInputStream(new WhiteListFileInputStream(bufferedInputStream), md)) {
            while (dis.read() != -1) {
                // Nothing to do.
            }
            char[] md5 = Hex.encodeHex(md.digest());
            result = String.valueOf(md5);
        }
    } catch (NoSuchAlgorithmException e) {
        LOGGER.error("Could not create MD5 hash for whitelisting.\n{}", e);
        result = "";
    }
    return result;
}

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