Example usage for java.security MessageDigest getInstance

List of usage examples for java.security MessageDigest getInstance

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Introduction

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

Prototype

public static MessageDigest getInstance(String algorithm) throws NoSuchAlgorithmException

Source Link

Document

Returns a MessageDigest object that implements the specified digest algorithm.

Usage

From source file:Main.java

public static byte[] copyFile(InputStream is, FileOutputStream os) throws IOException {
    MessageDigest digester = null;
    try {//from ww  w.  ja v a2  s.  c  o  m
        digester = MessageDigest.getInstance("MD5");

        byte[] buffer = new byte[16 * 1024];
        int length;
        while ((length = is.read(buffer)) > 0) {
            os.write(buffer, 0, length);
            digester.update(buffer, 0, length);
        }
        os.flush();
        os.close();

        //os.getFD().sync();
        //Log.d(TAG, "done copying");
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        is.close();
        Log.d(TAG, "done copying");
    }
    if (digester != null) {
        byte[] digest = digester.digest();
        return digest;
    }

    return null;
}

From source file:Main.java

/**
 * Calculates an MD5 hash for a text.//from   w  w  w.jav  a 2 s .c  o  m
 * 
 * @param dataToEncode
 *            The data to encode.
 * @return A text representation of a hexadecimal value of length 32.
 */
public static String messageDigestFive(final String dataToEncode) {
    MessageDigest m;
    try {
        m = MessageDigest.getInstance("MD5");
        byte[] data = dataToEncode.getBytes();
        m.update(data, 0, data.length);
        BigInteger i = new BigInteger(1, m.digest());
        return String.format("%1$032X", i);
    } catch (NoSuchAlgorithmException e) {
        // MD5 Should be supported by the runtime!
        throw new IllegalStateException(e);
    }
}

From source file:Main.java

/**
 * Returns the lowercase string representation of the file's MD5 sum.
 *//*  w w  w .  jav  a 2  s  .c  om*/
public static String getMD5Sum(String file) throws IOException {
    try {
        MessageDigest digest = MessageDigest.getInstance("MD5");
        InputStream is = new FileInputStream(file);
        byte[] buffer = new byte[8192];
        int read = 0;
        while ((read = is.read(buffer)) > 0) {
            digest.update(buffer, 0, read);
        }
        is.close();
        byte[] md5sum = digest.digest();
        BigInteger bigInt = new BigInteger(1, md5sum);
        return bigInt.toString(16);
    } catch (NoSuchAlgorithmException e) {
        return "";
    }
}

From source file:Main.java

public static String MD5(String string) {
    String result = null;/*from  w ww. ja  va 2s.  c  om*/
    try {
        char[] charArray = string.toCharArray();
        byte[] byteArray = new byte[charArray.length];
        for (int i = 0; i < charArray.length; i++) {
            byteArray[i] = (byte) charArray[i];
        }

        StringBuffer hexValue = new StringBuffer();
        byte[] md5Bytes = MessageDigest.getInstance("MD5").digest(byteArray);
        for (int i = 0; i < md5Bytes.length; i++) {
            int val = ((int) md5Bytes[i]) & 0xff;
            if (val < 16) {
                hexValue.append("0");
            }
            hexValue.append(Integer.toHexString(val));
        }

        result = hexValue.toString();
    } catch (Exception e) {
        e.printStackTrace();
    }
    return result;
}

From source file:Main.java

public static String getFileMd5String(File file) {
    if (!file.isFile())
        throw new IllegalArgumentException("only file can calculate MD5 value!");

    MessageDigest digest;//from  w  w w  .ja  v  a  2s.  c  o m
    FileInputStream in = null;
    byte buffer[] = new byte[8192];
    int len;
    try {
        digest = MessageDigest.getInstance("MD5");
        in = new FileInputStream(file);
        while ((len = in.read(buffer)) != -1) {
            digest.update(buffer, 0, len);
        }
        BigInteger bigInt = new BigInteger(1, digest.digest());
        return bigInt.toString(16);
    } catch (Exception e) {
        e.printStackTrace();
        return null;
    } finally {
        try {
            if (in != null)
                in.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

From source file:Main.java

private static String md5(final String s) {
    final String MD5 = "MD5";
    try {//from ww w. j  a  v  a2s. c o m
        MessageDigest digest = MessageDigest.getInstance(MD5);
        digest.update(s.getBytes());
        byte messageDigest[] = digest.digest();

        StringBuilder hexString = new StringBuilder();
        for (byte aMessageDigest : messageDigest) {
            String h = Integer.toHexString(0xFF & aMessageDigest);
            while (h.length() < 2)
                h = "0" + h;
            hexString.append(h);
        }
        return hexString.toString();
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
    }
    return "";
}

From source file:Main.java

public static byte[] getFileSHA1(String path) throws IOException {

    File file = new File(path);
    FileInputStream in = new FileInputStream(file);
    MessageDigest messagedigest;/* w w  w  . ja v a2s.  c  o  m*/
    try {
        messagedigest = MessageDigest.getInstance("SHA-1");

        byte[] buffer = new byte[1024 * 64];
        int len;

        while ((len = in.read(buffer)) > 0) {
            messagedigest.update(buffer, 0, len);
        }

        return messagedigest.digest();
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
    } catch (OutOfMemoryError e) {
        e.printStackTrace();
        throw e;
    } finally {
        in.close();
    }
    return null;
}

From source file:Main.java

public static String smallFileSha1(File file) {
    InputStream inputStream = null;
    try {/*from www .j ava2s .c o m*/
        MessageDigest md = MessageDigest.getInstance("SHA1");
        inputStream = new BufferedInputStream(new FileInputStream(file));
        byte[] buffer = new byte[1024];
        int nRead = 0;
        while ((nRead = inputStream.read(buffer)) != -1) {
            md.update(buffer, 0, nRead);
        }
        byte[] digest = md.digest();
        byte[] blockBytes = ByteBuffer.allocate(4).order(ByteOrder.LITTLE_ENDIAN).putInt(1).array();
        byte[] result = ByteBuffer.allocate(4 + digest.length).put(blockBytes, 0, 4)
                .put(digest, 0, digest.length).array();
        return Base64.encodeToString(result, Base64.URL_SAFE | Base64.NO_WRAP);
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        if (inputStream != null) {
            try {
                inputStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    return null;
}

From source file:Main.java

/**
 * Returns the Md5 hash for the given text.
 * //from   ww w. j  a v  a  2 s  .  com
 * @param text
 *            String whose Md5 hash should be returned.
 * @return Returns the Md5 hash for the given text.
 */
public static String getMd5Hash(String text) {
    StringBuffer result = new StringBuffer(32);
    try {
        MessageDigest md5 = MessageDigest.getInstance("MD5");
        md5.update(text.getBytes());
        Formatter f = new Formatter(result);

        byte[] digest = md5.digest();

        for (int i = 0; i < digest.length; i++) {
            f.format("%02x", new Object[] { new Byte(digest[i]) });
        }
    } catch (NoSuchAlgorithmException ex) {
        ex.printStackTrace();
    }

    return result.toString();
}

From source file:Main.java

/**
 * This method uses MessageDigest class to convert the passed string to
 * SHA-1 hexadecimal text./*from   w  w w .  j  a  v  a  2 s.c  o  m*/
 *
 * @param text Input string
 * @return Return SHA-1 value
 */
public static String convertToSHA1(String text) throws NoSuchAlgorithmException, UnsupportedEncodingException {
    final MessageDigest md = MessageDigest.getInstance("SHA-1");
    byte[] sha1hash = new byte[30];
    md.update(text.getBytes("iso-8859-1"), 0, text.length());
    sha1hash = md.digest();
    return convertToHex(sha1hash);
}