Example usage for java.security DigestInputStream read

Introduction

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

Prototype

public int read(byte b[]) throws IOException 

Source Link

Document

Reads up to b.length bytes of data from this input stream into an array of bytes.

Usage

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;
    try {/*from  w w  w . j  a  v a2 s.  c o m*/
        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

public static String getMD5(String file) {
    String md5 = "";

    try {/*from w  ww  .  ja  v a2  s  .  com*/
        MessageDigest md = MessageDigest.getInstance("MD5");
        InputStream is;
        is = new FileInputStream(file);

        DigestInputStream dis = new DigestInputStream(is, md);
        byte data[] = new byte[1024];
        @SuppressWarnings("unused")
        int count;
        while ((count = dis.read(data)) != -1) {

        }
        byte[] digest = md.digest();

        for (int i = 0; i < digest.length; i++) {
            md5 += Integer.toString((digest[i] & 0xff) + 0x100, 16).substring(1);
        }
        return md5;
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return md5;
}

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From source file:cz.muni.fi.xklinec.zipstream.Utils.java

/**
 * Computes SHA256 hash of a given file.
 * @param b/*from  w  w w . j av a  2 s  .  co  m*/
 * @return 
 */
public static String sha256(byte[] b) {
    try {
        MessageDigest sha = MessageDigest.getInstance("SHA-256");
        InputStream fis = new ByteArrayInputStream(b);
        DigestInputStream dis = new DigestInputStream(fis, sha);

        byte[] buffer = new byte[65536]; // 64kB buffer
        while (dis.read(buffer) != -1) {
        }

        byte[] hash = sha.digest();
        return new String(Base64.encode(hash));

    } catch (Exception e) {
        throw new IllegalArgumentException("Cannot compute SHA256 digest of the file", e);
    }
}

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

public static byte[] computeFileDigest(final String fileName) throws IOException {
    try {//from w ww . ja  va  2  s.co m
        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;
}

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From source file:hudson.plugins.ec2.EC2AxisPrivateKey.java

static String digest(PrivateKey k) throws IOException {
    try {//from ww w.j  a  v a2  s. co m
        MessageDigest md5 = MessageDigest.getInstance("SHA1");

        DigestInputStream in = new DigestInputStream(new ByteArrayInputStream(k.getEncoded()), md5);
        try {
            while (in.read(new byte[128]) > 0)
                ; // simply discard the input
        } finally {
            in.close();
        }
        StringBuilder buf = new StringBuilder();
        char[] hex = Hex.encodeHex(md5.digest());
        for (int i = 0; i < hex.length; i += 2) {
            if (buf.length() > 0)
                buf.append(':');
            buf.append(hex, i, 2);
        }
        return buf.toString();
    } catch (NoSuchAlgorithmException e) {
        throw new AssertionError(e);
    }
}

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From source file:Main.java

public static boolean checkMd5sum(File file, String checkCode) throws IOException {
    DigestInputStream dInput = null;
    try {//from w w w  . j  a v  a  2 s.c  om
        FileInputStream fInput = new FileInputStream(file);
        dInput = new DigestInputStream(fInput, getMd5Instance());
        byte[] buf = new byte[8192];
        while (dInput.read(buf) > 0) {
        }
        byte[] bytes = dInput.getMessageDigest().digest();
        return bytes2hex(bytes).equals(checkCode);
    } finally {
        closeQuietly(dInput);
    }
}

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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 www.j a va  2 s . c  o  m
        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));
}

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From source file:hudson.plugins.ec2.EC2PrivateKey.java

static String digestOpt(Key k, String dg) throws IOException {
    try {/*from   w  w  w.j  a va  2  s. c o  m*/
        MessageDigest md5 = MessageDigest.getInstance(dg);

        DigestInputStream in = new DigestInputStream(new ByteArrayInputStream(k.getEncoded()), md5);
        try {
            while (in.read(new byte[128]) > 0)
                ; // simply discard the input
        } finally {
            in.close();
        }
        StringBuilder buf = new StringBuilder();
        char[] hex = Hex.encodeHex(md5.digest());
        for (int i = 0; i < hex.length; i += 2) {
            if (buf.length() > 0)
                buf.append(':');
            buf.append(hex, i, 2);
        }
        return buf.toString();
    } catch (NoSuchAlgorithmException e) {
        throw new AssertionError(e);
    }
}

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From source file:Main.java

public static String md5(InputStream in) {
    int bufferSize = 256 * 1024;
    DigestInputStream digestInputStream = null;
    try {/* w  w  w .  java 2s  .c o  m*/
        MessageDigest messageDigest = MessageDigest.getInstance("MD5");
        digestInputStream = new DigestInputStream(in, messageDigest);
        byte[] buffer = new byte[bufferSize];
        while (digestInputStream.read(buffer) > 0)
            ;
        messageDigest = digestInputStream.getMessageDigest();
        byte[] resultByteArray = messageDigest.digest();
        char[] hexDigits = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
        char[] resultCharArray = new char[resultByteArray.length * 2];
        int index = 0;
        for (byte b : resultByteArray) {
            resultCharArray[index++] = hexDigits[b >>> 4 & 0xf];
            resultCharArray[index++] = hexDigits[b & 0xf];
        }
        return new String(resultCharArray);
    } catch (NoSuchAlgorithmException e) {
        return null;
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        try {
            if (digestInputStream != null)
                digestInputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    return null;
}

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From source file:Main.java

public static String encode(InputStream in) {
    int bufferSize = 256 * 1024;
    DigestInputStream digestInputStream = null;
    try {//from w ww .  j a va  2 s. c  o m
        MessageDigest messageDigest = MessageDigest.getInstance("MD5");
        digestInputStream = new DigestInputStream(in, messageDigest);
        byte[] buffer = new byte[bufferSize];
        while (digestInputStream.read(buffer) > 0)
            ;
        messageDigest = digestInputStream.getMessageDigest();
        byte[] resultByteArray = messageDigest.digest();
        char[] hexDigits = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
        char[] resultCharArray = new char[resultByteArray.length * 2];
        int index = 0;
        for (byte b : resultByteArray) {
            resultCharArray[index++] = hexDigits[b >>> 4 & 0xf];
            resultCharArray[index++] = hexDigits[b & 0xf];
        }
        return new String(resultCharArray);
    } catch (NoSuchAlgorithmException e) {
        return null;
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        try {
            if (digestInputStream != null)
                digestInputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    return null;
}

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