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

        final String signature = buffer.toString();


        String serialVersionUID = String.valueOf(0L);
        try
        {
            MessageDigest md = MessageDigest.getInstance("SHA");
            byte[] hashBytes = md.digest(signature.getBytes());


            long hash = 0;
            for (int ctr = Math.min(
                        hashBytes.length,
                        8) - 1; ctr >= 0; ctr--)

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  private static final char[] hexChars = { '0', '1', '2', '3', '4', '5', '6',
      '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };


  public static String MD5(String str) {
    try {
      MessageDigest md = MessageDigest.getInstance("MD5");
      md.update(str.getBytes());
      return hexStringFromBytes(md.digest());
    } catch (Exception e) {
      e.printStackTrace();
      return "";
    }
  }

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    }
  }


  public static String MD5(byte[] source) {
    try {
      MessageDigest md = MessageDigest.getInstance("MD5");
      md.update(source);
      return hexStringFromBytes(md.digest());
    } catch (Exception e) {
      e.printStackTrace();
      return "";
    }
  }

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    }
  }


  public static byte[] MD5bytes(String str) {
    try {
      MessageDigest md = MessageDigest.getInstance("MD5");
      md.update(str.getBytes());
      return md.digest();
    } catch (Exception e) {
      e.printStackTrace();
      return null;
    }
  }

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        else {
            out.println("  " + url);
            try {
                final String algorithm = "MD5";
                byte[] digest;
                MessageDigest md = MessageDigest.getInstance(algorithm);
                DigestInputStream in = new DigestInputStream(url.openStream(), md);
                try {
                    byte[] buf = new byte[8192];
                    int n;
                    do { n = in.read(buf); } while (n > 0);
                    digest = md.digest();
                } finally {
                    in.close();
                }
                StringBuilder sb = new StringBuilder();
                for (byte b: digest)

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  /** */
  private boolean checkIntegrity(File src, File dest) throws IOException, NoSuchAlgorithmException
  {
    BufferedInputStream ins = new BufferedInputStream(new FileInputStream(src));
    BufferedInputStream ind = new BufferedInputStream(new FileInputStream(dest));
    MessageDigest md1 = MessageDigest.getInstance("MD5");
    MessageDigest md2 = MessageDigest.getInstance("MD5");


    int r = 0;
    byte[] buf1 = new byte[BUFFER_SIZE];
    byte[] buf2 = new byte[BUFFER_SIZE];


    while (r !=-1)
    {
      r = ins.read(buf1);
      ind.read(buf2);


      md1.update(buf1);
      md2.update(buf2);
    }


    ins.close();
    ind.close();
    return MessageDigest.isEqual(md1.digest(), md2.digest());
  }

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    testDigest();
  }


  static private void testDigest() {
    try {
      MessageDigest md = MessageDigest.getInstance("MD5");
      Provider p = md.getProvider();
      Set<Provider.Service> services = p.getServices();
      for (Provider.Service service : services) {
        System.out.println("Service="+service);
      }
    } catch (NoSuchAlgorithmException e) {

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   The static initializer of this class will barf if the hash function is not present.
  */
  private static String hash(String aCleartext) {
    String result = null;
    
    MessageDigest sha = null;
    try {
      sha = MessageDigest.getInstance("SHA-1");
    }
    catch (NoSuchAlgorithmException ex){
      fLogger.severe("Cannot find SHA-1 hash function.");
    }


    if (sha != null){
      byte[] digest =  sha.digest( aCleartext.getBytes() );
      result = hexEncode(digest);
    }
    else {
      result = aCleartext;
    }

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    return shift(minId(valueOf(value)));
  }


  public long hashOf(Value value) {
    final long span = 1152921504606846975l;
    MessageDigest digest = md5.get();
    long type = hashLiteralType(digest, value);
    long hash = type * 31 + hash(digest, value.stringValue());
    return hash & span | valueOf(value).index() * (span + 1);
  }

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    if (algorithmID == null) {
      Object[] exArgs = { algorithmURI };
      throw new XMLSignatureException("algorithms.NoSuchMap", exArgs);
    }


      MessageDigest md;
      String provider=JCEMapper.getProviderId();
      try {        
         if (provider==null) {
           md = MessageDigest.getInstance(algorithmID);
         } else {

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