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

   * @return      HASH结果
   */
  private static byte[] digest(String type, byte[] bytes)
  {
        try {
         MessageDigest dist = MessageDigest.getInstance(type);
        return dist.digest(bytes);
        } catch (NoSuchAlgorithmException e) {
        throw new IllegalArgumentException("Cannot find digest:"+type, e);
        }
  }

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         return f.toString();
      }


      protected static byte[] internalCreateHash(String pathName) throws NoSuchAlgorithmException
      {
         MessageDigest digest = getDigest();
         try
         {
            // update
            digest.update(pathName.getBytes());
            // return
            return digest.digest();
         }
         finally
         {
            // reset
            digest.reset();
         }
      }

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  /**
   * Creates a md5 encoded in base64 for given input.
   */
  public static String md5(byte[] input) {
    try {
      MessageDigest md5 = MessageDigest.getInstance("MD5");
      md5.reset();
      md5.update(input);
      return jfix.util.Base64.encodeBytes(md5.digest());
    } catch (Exception e) {
      throw new RuntimeException(e);
    }
  }

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   * @return MD5 encrypted string
   */
  public static String encrypt(String s) {
    byte[] inbytes = s.getBytes();
    try {
      MessageDigest md5Helper = MessageDigest.getInstance(HASH_ALGORITHM);
      byte[] outbytes = md5Helper.digest(inbytes);
      String out = md5Encoder.encode(outbytes);
      return out;
    } catch (NoSuchAlgorithmException e) {
      throw new AssertException("Cannot load MD5 Message Digest ," + HASH_ALGORITHM + " not supported");
    }

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        }
        return buf.toString();
    }


    public static String encodeSha1(String text) {
        MessageDigest md;
        try {
            md = MessageDigest.getInstance("SHA-1");
        } catch (NoSuchAlgorithmException e) {
            try {
                md = MessageDigest.getInstance("MD5");
            } catch (NoSuchAlgorithmException e1) {
                throw new RuntimeException(e1);
            }
        }


        byte[] sha1hash = new byte[40];


        md.update(text.getBytes(), 0, text.length());


        sha1hash = md.digest();


        return convertToHex(sha1hash);
    }

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    return res.toArray(new BaseAuthorization[res.size()]);
  }


  private String encode(String plaintext) {
    try {
      MessageDigest md = MessageDigest.getInstance("MD5");
      md.update(plaintext.getBytes("UTF-8"));
      return Base64.encodeBytes(md.digest());
    } catch (NoSuchAlgorithmException e) {
      log.error(e.getMessage(), e);
    } catch (UnsupportedEncodingException e) {
      log.error(e.getMessage(), e);
    }

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      }
      String username = args[0];
      String realm = args[1];
      String password = args[2];
      String A1 = username + ":" + realm + ":" + password;
      MessageDigest digest = MessageDigest.getInstance("MD5");
      String hA1 = H(A1, digest);
      System.out.println("RFC2617 A1 hash: " + hA1);
   }

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    */
   protected synchronized MessageDigest getDigest()
   {
      if (this.digest == null)
      {
         MessageDigest d = null;
         try
         {
            d = MessageDigest.getInstance(algorithm);
         }
         catch (NoSuchAlgorithmException e)

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      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;
   }

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      byte[] nb = CryptoUtil.trim(B.toByteArray());
      // clientHash = H(N) xor H(g) | H(U) | s | A
      clientHash.update(ab);
      if( log.isTraceEnabled() )
      {
         MessageDigest tmp = CryptoUtil.copy(clientHash);
         log.trace("H[H(N) xor H(g) | H(U) | s | A]: "+CryptoUtil.tob64(tmp.digest()));
      }
      // clientHash = H(N) xor H(g) | H(U) | A | B
      clientHash.update(nb);
      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()));
      }
      // serverHash = A
      serverHash.update(ab);
      // Calculate u as the first 32 bits of H(B)
      byte[] hB = CryptoUtil.newDigest().digest(nb);
      byte[] ub =
      {hB[0], hB[1], hB[2], hB[3]};
      // Calculate S = (A * v^u) ^ b % N
      BigInteger A = new BigInteger(1, ab);
      if( log.isTraceEnabled() )
         log.trace("A: "+CryptoUtil.tob64(A.toByteArray()));
      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 A_v2u = A.multiply(v.modPow(u, N)).mod(N);
      if( log.isTraceEnabled() )
         log.trace("A * v^u: "+CryptoUtil.tob64(A_v2u.toByteArray()));
      BigInteger S = A_v2u.modPow(b, 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);
      if( log.isTraceEnabled() )
      {
         MessageDigest tmp = CryptoUtil.copy(clientHash);
         log.trace("H[H(N) xor H(g) | H(U) | s | A | B | K]: "+CryptoUtil.tob64(tmp.digest()));
      }
   }

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