Examples of java.security.MessageDigest

java.security.MessageDigest
This MessageDigest class provides applications the functionality of a message digest algorithm, such as MD5 or SHA. Message digests are secure one-way hash functions that take arbitrary-sized data and output a fixed-length hash value.
A MessageDigest object starts out initialized. The data is processed through it using the {@link #update(byte) update}methods. At any point {@link #reset() reset} can be calledto reset the digest. Once all the data to be updated has been updated, one of the {@link #digest() digest} methods should be called to complete the hash computation.
The digest method can be called once for a given number of updates. After digest has been called, the MessageDigest object is reset to its initialized state.
Implementations are free to implement the Cloneable interface. Client applications can test cloneability by attempting cloning and catching the CloneNotSupportedException:
```
 MessageDigest md = MessageDigest.getInstance("SHA"); try { md.update(toChapter1); MessageDigest tc1 = md.clone(); byte[] toChapter1Digest = tc1.digest(); md.update(toChapter2); ...etc. } catch (CloneNotSupportedException cnse) { throw new DigestException("couldn't make digest of partial content"); } 
```
Note that if a given implementation is not cloneable, it is still possible to compute intermediate digests by instantiating several instances, if the number of digests is known in advance.
Note that this class is abstract and extends from MessageDigestSpi for historical reasons. Application developers should only take notice of the methods defined in this MessageDigest class; all the methods in the superclass are intended for cryptographic service providers who wish to supply their own implementations of message digest algorithms. @author Benjamin Renaud @version 1.82, 09/07/09 @see DigestInputStream @see DigestOutputStream

            try {
                URL url = new URL(sku);
                String host = url.getHost();
                if (host == null) throw new IOException("charding - bad url, host empty: " + sku);
                try {
                    MessageDigest digest = MessageDigest.getInstance("MD5");
                    digest.update(host.getBytes(charsetUTF8));
                    byte[] md5 = digest.digest();
                    return (0xff & md5[0]) % this.dimension;
                } catch (NoSuchAlgorithmException e) {
                    throw new IOException("charding - no md5 available: " + e.getMessage());
                }
            } catch (MalformedURLException e) {

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     * @param string string to hash
     * @return hashed string
     */
    public static String digest(String string) throws NoSuchAlgorithmException, UnsupportedEncodingException {
        byte[] b = string.getBytes();
        MessageDigest md = MessageDigest.getInstance("MD5");
        md.update(b);
        byte[] digest = md.digest();
        return new String(digest);
    }

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      return Base64.encodeBytes(bodyHash);
   }


   private byte[] hash(byte[] body, String hashAlgorithm) throws SignatureException
   {
      MessageDigest digest = null;
      try
      {
         digest = MessageDigest.getInstance(hashAlgorithm);
      }
      catch (Exception e)
      {
         throw new SignatureException(e);
      }


      int length = body.length;


      if (attributes.containsKey(LENGTH))
      {
         length = Integer.parseInt(attributes.get(LENGTH));
      }


      byte[] bodyHash = null;
      digest.update(body, 0, length);
      bodyHash = digest.digest();
      return bodyHash;
   }

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   protected String createHash(byte[] entity)
   {
      try
      {
         MessageDigest messagedigest = MessageDigest.getInstance("MD5");
         byte abyte0[] = messagedigest.digest(entity);
         return byteArrayToHexString(abyte0);
      }
      catch (NoSuchAlgorithmException e)
      {
         throw new RuntimeException(e);

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            '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
    };


    public String hash(String text) {
        try {
            MessageDigest md = MessageDigest.getInstance(hashFunction);
            md.update(text.getBytes(charset));
            byte[] raw = md.digest();
            return new String(encodeHex(raw));
        }
        catch (Exception e) {
            throw new RuntimeException(e);
        }

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    String hashFunction = "MD5";
    String charset      = "UTF-8";
    
    public String hash(String password) {
        try {
            MessageDigest md = MessageDigest.getInstance(hashFunction);
            md.update(password.getBytes(charset));
            byte[] raw = md.digest();
            return new String(Hex.encodeHex(raw));
        } 
        catch (Exception e) {
            throw new RuntimeException(e);        
        }

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        // generate a hex representation from the md5 of a byte-array
        return encodeHex(encodeMD5Raw(b));
    }


    public static byte[] encodeMD5Raw(final String key) {
      MessageDigest digest = null;
      boolean fromPool = true;
      if (digestPool.size() == 0) {
          // if there are no digest objects left, create some on the fly
          // this is not the most effective way but if we wouldn't do that the encoder would block
          try {
                digest = MessageDigest.getInstance("MD5");
                digest.reset();
                fromPool = false;
            } catch (final NoSuchAlgorithmException e) {
            }
      }
        if (digest == null) try {
            digest = digestPool.take();
        } catch (final InterruptedException e) {
          Log.logWarning("Digest", "using generic instead of pooled digest");
          try {
        digest = MessageDigest.getInstance("MD5");
      } catch (final NoSuchAlgorithmException e1) {
          Log.logException(e1);
      }
      digest.reset();
      fromPool = false;
    }
        byte[] keyBytes;
        keyBytes = UTF8.getBytes(key);
        digest.update(keyBytes);
        final byte[] result = digest.digest();
        digest.reset();
        if (fromPool) {
            returntopool: while (true) {
                try {
                    digestPool.put(digest);
                    break returntopool;

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     */
    public static byte[] fastFingerprintRaw(final File file, final boolean includeDate) throws IOException {
        final int mb = 16 * 1024;
        final long fl = file.length();
        if (fl <= 2 * mb) return encodeMD5Raw(file);
        MessageDigest digest;
        try {
            digest = MessageDigest.getInstance("MD5");
        } catch (final NoSuchAlgorithmException e) {
            Log.logException(e);
            return null;
        }
        final RandomAccessFile raf = new RandomAccessFile(file, "r");
        final byte[] a = new byte[mb];
        try {
            raf.seek(0);
            raf.readFully(a, 0, mb);
            digest.update(a, 0, mb);
            raf.seek(fl - mb);
            raf.readFully(a, 0, mb);
            digest.update(a, 0, mb);
            digest.update(NaturalOrder.encodeLong(fl, 8), 0, 8);
            if (includeDate) digest.update(NaturalOrder.encodeLong(file.lastModified(), 8), 0, 8);
        } finally {
            raf.close();
            try {raf.getChannel().close();} catch (final IOException e) {}
        }
        return digest.digest();
    }

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        return digest.digest();
    }


    private static byte[] encodeMD5Raw(final byte[] b) {
        try {
            final MessageDigest digest = MessageDigest.getInstance("MD5");
            digest.reset();
            final InputStream  in = new ByteArrayInputStream(b);
            final byte[] buf = new byte[2048];
            int n;
            while ((n = in.read(buf)) > 0) digest.update(buf, 0, n);
            in.close();
            // now compute the hex-representation of the md5 digest
            return digest.digest();
        } catch (final java.security.NoSuchAlgorithmException e) {
            System.out.println("Internal Error at md5:" + e.getMessage());
        } catch (final java.io.IOException e) {
            System.out.println("byte[] error: " + e.getMessage());
        }

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        buf.putInt(key2);
        buf.putLong(num);
        buf.flip();
        
        try {
            MessageDigest md5 = MessageDigest.getInstance("MD5");
            md5.reset();
            md5.update(buf.array());
            return md5.digest();
        } catch (NoSuchAlgorithmException nse) {
            throw new IOException(nse.toString());
        }
    }

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