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 String generateMarvelHash(String publicKey, String privateKey) {
    String marvelHash = "";
    try {//from   w w w .  jav a2  s . c  o  m
        String timeStamp = getUnixTimeStamp();
        String marvelData = timeStamp + privateKey + publicKey;
        MessageDigest messageDigest = MessageDigest.getInstance("MD5");
        byte[] hash = messageDigest.digest(marvelData.getBytes());
        StringBuilder stringBuilder = new StringBuilder(2 * hash.length);
        for (byte b : hash) {
            stringBuilder.append(String.format("%02x", b & 0xff));
        }
        marvelHash = stringBuilder.toString();
    } catch (NoSuchAlgorithmException e) {
        System.out.println("[DEBUG]" + " MarvelApiUtils generateMarvelHash - " + "NoSuchAlgorithmException");
    }
    return marvelHash;
}

From source file:Main.java

public static String hashStream(InputStream in, String hash) throws IOException {
    MessageDigest md5 = null;/*from ww  w  .j av  a2 s .  co  m*/
    try {
        md5 = MessageDigest.getInstance(hash);
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
    }

    int bsize = 4096;
    byte[] buffer = new byte[bsize];
    int length;

    while ((length = in.read(buffer, 0, bsize)) > 0) {
        md5.update(buffer, 0, length);
    }

    return toHex(md5.digest());
}

From source file:Main.java

public static String generateMarvelHash(String publicKey, String privateKey) {

    String marvelHash = "";

    try {/* w w  w.  j  a v a  2s.  c  o  m*/
        String timeStamp = getUnixTimeStamp();
        String marvelData = timeStamp + privateKey + publicKey;

        MessageDigest messageDigest = MessageDigest.getInstance("MD5");
        byte[] hash = messageDigest.digest(marvelData.getBytes());

        StringBuilder stringBuilder = new StringBuilder(2 * hash.length);

        for (byte b : hash)
            stringBuilder.append(String.format("%02x", b & 0xff));

        marvelHash = stringBuilder.toString();

    } catch (NoSuchAlgorithmException e) {

        System.out.println("[DEBUG]" + " MarvelApiUtils generateMarvelHash - " + "NoSuchAlgorithmException");
    }

    return marvelHash;
}

From source file:Main.java

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

    try {/* w  w w.ja  v  a2 s.  c om*/
        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;
}

From source file:Main.java

/**
 * Returns a String Object which contains the SHA256 Hash value of the input
 *
 * @param input a String object for which SHA256 should be calculated
 * @return SHA256 of the input String/*from ww w  . j a  va 2 s  .c  o  m*/
 */
public static String getSHA256(String input) {
    try {
        MessageDigest digest = MessageDigest.getInstance("SHA-256");
        byte[] hash = digest.digest(input.getBytes("UTF-8"));
        StringBuilder hexString = new StringBuilder();

        for (int i = 0; i < hash.length; i++) {
            String hex = Integer.toHexString(0xff & hash[i]);
            if (hex.length() == 1)
                hexString.append('0');
            hexString.append(hex);
        }
        return hexString.toString();
    } catch (Exception ex) {
        throw new RuntimeException(ex);
    }
}

From source file:Main.java

public static String md5Summary(String str) {

    if (str == null) {
        return null;
    }// w w  w  .j  a v a 2s  .c o m

    MessageDigest messageDigest = null;

    try {
        messageDigest = MessageDigest.getInstance("MD5");
        messageDigest.reset();
        messageDigest.update(str.getBytes("utf-8"));
    } catch (NoSuchAlgorithmException e) {

        return str;
    } catch (UnsupportedEncodingException e) {
        return str;
    }

    byte[] byteArray = messageDigest.digest();

    StringBuffer md5StrBuff = new StringBuffer();

    for (int i = 0; i < byteArray.length; i++) {
        if (Integer.toHexString(0xFF & byteArray[i]).length() == 1)
            md5StrBuff.append("0").append(Integer.toHexString(0xFF & byteArray[i]));
        else
            md5StrBuff.append(Integer.toHexString(0xFF & byteArray[i]));
    }

    return md5StrBuff.toString();
}

From source file:Main.java

/**
 * generates MD5 of input string//from  w  w  w  .j av a 2 s . c o  m
 *
 * @param input string to be hashed
 * @return MD5 hash of string
 */
public static String getMD5(String input) {

    MessageDigest m = null;
    try {
        m = MessageDigest.getInstance("MD5");
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
    }
    m.reset();
    m.update(input.getBytes());
    byte[] digest = m.digest();
    BigInteger bigInt = new BigInteger(1, digest);
    String hashtext = bigInt.toString(16);
    //zero pad to get the full 32 chars.
    while (hashtext.length() < 32) {
        hashtext = "0" + hashtext;
    }
    return hashtext;
}

From source file:Main.java

public static String checkSum(String path) {
    String checksum = null;//from w  ww.j  ava2 s .c o  m
    try {
        FileInputStream fis = new FileInputStream(path);
        MessageDigest md = MessageDigest.getInstance("MD5");

        //Using MessageDigest update() method to provide input
        byte[] buffer = new byte[8192];
        int numOfBytesRead;
        while ((numOfBytesRead = fis.read(buffer)) > 0) {
            md.update(buffer, 0, numOfBytesRead);
        }
        byte[] hash = md.digest();
        checksum = new BigInteger(1, hash).toString(16); //don't use this, truncates leading zero
    } catch (IOException | NoSuchAlgorithmException ignored) {
    }
    assert checksum != null;
    return checksum.trim();
}

From source file:Main.java

public static String getFileMD5(File file) {
    if (!file.isFile()) {
        return null;
    }//from   w  w  w. j a  v  a2s . c  o m
    MessageDigest digest = null;
    FileInputStream in = null;
    byte buffer[] = new byte[1024];
    int len;
    try {
        digest = MessageDigest.getInstance("MD5");
        in = new FileInputStream(file);
        while ((len = in.read(buffer, 0, 1024)) != -1) {
            digest.update(buffer, 0, len);
        }
        in.close();
    } catch (Exception e) {
        e.printStackTrace();
        return null;
    }
    BigInteger bigInt = new BigInteger(1, digest.digest());
    return bigInt.toString(16);
}

From source file:Main.java

public static String getMd5Hash(String buffer) {
    MessageDigest md;/*  w w  w .  j ava  2  s.c  o  m*/
    try {
        md = MessageDigest.getInstance("MD5");
        return bytesToHex(md.digest(buffer.getBytes("UTF-8")));
    } catch (NoSuchAlgorithmException | UnsupportedEncodingException ignore) {
    }
    return "";
}