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

         serverHash.update(M1);
         // serverHash = A | M | K
         serverHash.update(K);
         if( log.isTraceEnabled() )
         {
            MessageDigest tmp = CryptoUtil.copy(serverHash);
            log.trace("H(A | M1 | K)"+CryptoUtil.tob64(tmp.digest()));
         }
         valid = true;
      }
      return valid;
   }

View Full Code Here

      if( log.isTraceEnabled() )
         log.trace("H(N) xor H(g): "+CryptoUtil.tob64(hxg));
      clientHash.update(hxg);
      if( log.isTraceEnabled() )
      {
         MessageDigest tmp = CryptoUtil.copy(clientHash);
         log.trace("H[H(N) xor H(g)]: "+CryptoUtil.tob64(tmp.digest()));
      }
      // clientHash = H(N) xor H(g) | H(U)
      clientHash.update(CryptoUtil.newDigest().digest(username.getBytes()));
      if( log.isTraceEnabled() )
      {
         MessageDigest tmp = CryptoUtil.copy(clientHash);
         log.trace("H[H(N) xor H(g) | H(U)]: "+CryptoUtil.tob64(tmp.digest()));
      }
      // clientHash = H(N) xor H(g) | H(U) | s
      clientHash.update(params.s);
      if( log.isTraceEnabled() )
      {
         MessageDigest tmp = CryptoUtil.copy(clientHash);
         log.trace("H[H(N) xor H(g) | H(U) | s]: "+CryptoUtil.tob64(tmp.digest()));
      }
      K = null;
   }

View Full Code Here

         Abytes = CryptoUtil.trim(A.toByteArray());
         // clientHash = H(N) xor H(g) | H(U) | A
         clientHash.update(Abytes);
         if( log.isTraceEnabled() )
         {
            MessageDigest tmp = CryptoUtil.copy(clientHash);
            log.trace("H[H(N) xor H(g) | H(U) | s | A]: "+CryptoUtil.tob64(tmp.digest()));
         }
         // serverHash = A
         serverHash.update(Abytes);
      }
      return Abytes;

View Full Code Here

   {
      // clientHash = H(N) xor H(g) | H(U) | s | A | B
      clientHash.update(Bbytes);
      if( log.isTraceEnabled() )
      {
         MessageDigest tmp = CryptoUtil.copy(clientHash);
         log.trace("H[H(N) xor H(g) | H(U) | s | A | B]: "+CryptoUtil.tob64(tmp.digest()));
      }
      // Calculate u as the first 32 bits of H(B)
      byte[] hB = CryptoUtil.newDigest().digest(Bbytes);
      byte[] ub =
      {hB[0], hB[1], hB[2], hB[3]};
      // Calculate S = (B - g^x) ^ (a + u * x) % N
      BigInteger B = new BigInteger(1, Bbytes);
      if( log.isTraceEnabled() )
         log.trace("B: "+CryptoUtil.tob64(B.toByteArray()));
      if( B.compareTo(v) < 0 )
         B = B.add(N);
      if( log.isTraceEnabled() )
         log.trace("B': "+CryptoUtil.tob64(B.toByteArray()));
      if( log.isTraceEnabled() )
         log.trace("v: "+CryptoUtil.tob64(v.toByteArray()));
      BigInteger u = new BigInteger(1, ub);
      if( log.isTraceEnabled() )
         log.trace("u: "+CryptoUtil.tob64(u.toByteArray()));
      BigInteger B_v = B.subtract(v);
      if( log.isTraceEnabled() )
         log.trace("B - v: "+CryptoUtil.tob64(B_v.toByteArray()));
      BigInteger a_ux = a.add(u.multiply(x));
      if( log.isTraceEnabled() )
         log.trace("a + u * x: "+CryptoUtil.tob64(a_ux.toByteArray()));
      BigInteger S = B_v.modPow(a_ux, N);
      if( log.isTraceEnabled() )
         log.trace("S: "+CryptoUtil.tob64(S.toByteArray()));
      // K = SessionHash(S)
      MessageDigest sessionDigest = MessageDigest.getInstance(params.hashAlgorithm);
      K = sessionDigest.digest(S.toByteArray());
      if( log.isTraceEnabled() )
         log.trace("K: "+CryptoUtil.tob64(K));
      // clientHash = H(N) xor H(g) | H(U) | A | B | K
      clientHash.update(K);
      byte[] M1 = clientHash.digest();
      if( log.isTraceEnabled() )
         log.trace("M1: H[H(N) xor H(g) | H(U) | s | A | B | K]: "+CryptoUtil.tob64(M1));
      serverHash.update(M1);
      serverHash.update(K);
      if( log.isTraceEnabled() )
      {
         MessageDigest tmp = CryptoUtil.copy(serverHash);
         log.trace("H[A | M1 | K]: "+CryptoUtil.tob64(tmp.digest()));
      }
      return M1;
   }

View Full Code Here

     * @return the encrypted password, or null if encryption failed.
     */
    private String encryptPassword( String password ) {


        try {
            MessageDigest md = MessageDigest.getInstance("SHA");


            //Create the encrypted Byte[]
            md.update( password.getBytes() );
            byte[] hash = md.digest();


            //Convert the byte array into a String


            StringBuffer hashStringBuf = new StringBuffer();
            String byteString;

View Full Code Here

   public static long createHash(String methodDesc)
           throws Exception
   {
      long hash = 0;
      ByteArrayOutputStream bytearrayoutputstream = new ByteArrayOutputStream(512);
      MessageDigest messagedigest = MessageDigest.getInstance("SHA");
      DataOutputStream dataoutputstream = new DataOutputStream(new DigestOutputStream(bytearrayoutputstream, messagedigest));
      dataoutputstream.writeUTF(methodDesc);
      dataoutputstream.flush();
      byte abyte0[] = messagedigest.digest();
      for (int j = 0; j < Math.min(8, abyte0.length); j++)
         hash += (long) (abyte0[j] & 0xff) << j * 8;
      return hash;


   }

View Full Code Here

  }


  public static String hash(String string, String algorithm, String encoding) throws UnsupportedEncodingException{


    try {
      MessageDigest digest = MessageDigest.getInstance(algorithm);


      digest.update(string.getBytes(encoding));


      byte[] encodedPassword = digest.digest();


      return new BigInteger(1, encodedPassword).toString(16);


      //TODO fix if hash starts with zeroes!

View Full Code Here

  public static String hash(File file, String algorithm, ProgressMeter progressMeter) throws IOException{


    FileInputStream fileInputStream = null;


    try {
      MessageDigest digest = MessageDigest.getInstance(algorithm);
      fileInputStream = new FileInputStream(file);


      DigestInputStream digestInputStream = new DigestInputStream(fileInputStream, digest);


      if(progressMeter != null){


        progressMeter.setStartTime();
        progressMeter.setFinish(file.length());
      }


      byte[] buffer = new byte[8192];


      int bytesRead = 1;


      if(progressMeter != null){


        while ((bytesRead = digestInputStream.read(buffer)) != -1){


          progressMeter.incrementCurrentPosition(bytesRead);
        }


      }else{


        while ((bytesRead = digestInputStream.read(buffer)) != -1){}
      }


      byte[] hash = digest.digest();


      if(progressMeter != null){


        progressMeter.setEndTime();
      }

View Full Code Here

  }


  public static String mysqlPasswordHash(String string){


    try {
      MessageDigest digest = MessageDigest.getInstance(HashAlgorithms.SHA1);


      try {
        digest.update(string.getBytes("UTF-8"));


      } catch (UnsupportedEncodingException e) {


        throw new RuntimeException(e);
      }


      byte[] encodedPassword = digest.digest();


      digest.update(encodedPassword);


      encodedPassword = digest.digest();


      String hash = new BigInteger(1, encodedPassword).toString(16).toUpperCase();


      while(hash.length() < 40){

View Full Code Here

        StringBuffer etag = new StringBuffer();
        etag.append('"');


        /* Append the MD5 hash of this resource name */
        try {
            MessageDigest digester = MessageDigest.getInstance("MD5");
            digester.reset();
            digester.update(path.getBytes("UTF8"));
            etag.append(DAVUtilities.toHexString(digester.digest()));
            etag.append('-');
        } catch (Exception e) {
            // If we can't get the MD5 HASH, let's ignore and hope...
        }

View Full Code Here

0 1 2 3 4 5 6 7 8 9

TOP

Related Classes of java.security.MessageDigest

codec.x509.extensions.CertHashExtension

com.afewmoreamps.JitCaskImpl

com.afewmoreamps.MiniCask

com.amazonaws.auth.AbstractAWSSigner

com.atolsystems.atolutilities.MultiPartStore

com.bitsofproof.supernode.common.Hash

com.common.platform.utils.security.DigestUtils

com.dyuproject.util.DigestUtil

com.gentics.cr.template.FileTemplate

com.google.gwt.dev.util.Util

All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.