Examples of javax.crypto.Mac.doFinal()

javax.crypto.Mac.doFinal()
Computes the digest of this MAC based on the data previously specified in {@link #update} calls.
This {@code Mac} instance is reverted to its initial state and can beused to start the next MAC computation with the same parameters or initialized with different parameters. @return the generated digest. @throws IllegalStateException if this MAC is not initialized.

   *//*
   +-------------------------------------------------------------------------*/
   static private String hashKey(String in) throws Exception {
      Mac mac = Mac.getInstance(ALGO);
      mac.init(new SecretKeySpec(paySecret.getBytes(ENC), ALGO));
      return base64Url(mac.doFinal(in.getBytes(ENC)));
   }


   /*----------------------------------------------------------------base64Url-+
   *//**
   *//*

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  private String sign(String data, String key) {
    try {
      SecretKeySpec signingKey = new SecretKeySpec(key.getBytes(ENCODING), SIGNATURE_METHOD);
      Mac mac = Mac.getInstance(SIGNATURE_METHOD);
      mac.init(signingKey);
      byte[] rawHmac = mac.doFinal(data.getBytes(ENCODING));
      return Base64.encodeBytes(rawHmac);
    } catch (Exception e) {
      throw new RuntimeException(e);
    }
  }

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  public static byte[] hmacSha1(SecretKeySpec signingKey, byte[] buffer, int offset, int length) {
    Mac mac = buildHmacSha1(signingKey);


    mac.update(buffer, offset, length);
    byte[] hash = mac.doFinal();
    return hash;
  }


  private static MessageDigest getMessageDigest(String algorithm) {
    try {

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        }
        // Check the hash.
        Mac hmac = Mac.getInstance("HmacSHA256", hmacProvider);
        hmac.init(new SecretKeySpec(cryptoKey, "HmacSHA256"));
        hmac.update(plaintext); // plaintext includes lengthBytes
        byte[] hashCheck = hmac.doFinal();
        if(!Arrays.equals(hash, hashCheck)) {
          throw new CHKDecodeException("HMAC is wrong, wrong decryption key?");
        }
        return Key.decompress(dontCompress ? false : key.isCompressed(), plaintext, size, bf, 
            Math.min(maxLength, CHKBlock.MAX_LENGTH_BEFORE_COMPRESSION), key.compressionAlgorithm, false);

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        // Check the hash.
        Mac hmac = Mac.getInstance("HmacSHA256", hmacProvider);
        hmac.init(new SecretKeySpec(cryptoKey, "HmacSHA256"));
        hmac.update(plaintext);
        hmac.update(lengthBytes);
        byte[] hashCheck = hmac.doFinal();
        if(!Arrays.equals(hash, hashCheck)) {
          throw new CHKDecodeException("HMAC is wrong, wrong decryption key?");
        }
    } catch(GeneralSecurityException e) {
      throw new CHKDecodeException("Problem with JCA, should be impossible!", e);

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        byte[] tmpLen = new byte[] { 
              (byte)(dataLength >> 8), (byte)(dataLength & 0xff)
            };
        hmac.update(data);
        hmac.update(tmpLen);
        byte[] hash = hmac.doFinal();
        byte[] header = new byte[hash.length+2+2];
      if(blockHashAlgorithm == 0) cryptoAlgorithm = KeyBlock.HASH_SHA256;
      if(blockHashAlgorithm != KeyBlock.HASH_SHA256)
        throw new IllegalArgumentException("Unsupported block hash algorithm "+cryptoAlgorithm);
        header[0] = (byte)(blockHashAlgorithm >> 8);

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        byte[] tmpLen = new byte[] { 
              (byte)(dataLength >> 8), (byte)(dataLength & 0xff)
            };
        hmac.update(data);
        hmac.update(tmpLen);
        byte[] hash = hmac.doFinal();
        byte[] header = new byte[hash.length+2+2];
      if(blockHashAlgorithm == 0) cryptoAlgorithm = KeyBlock.HASH_SHA256;
      if(blockHashAlgorithm != KeyBlock.HASH_SHA256)
        throw new IllegalArgumentException("Unsupported block hash algorithm "+cryptoAlgorithm);
        header[0] = (byte)(blockHashAlgorithm >> 8);

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        mac.reset();


        mac.update(message, 0, message.length);


        out = mac.doFinal();


        if (!areEqual(out, output))
        {
            fail("Failed - expected " + new String(Hex.encode(output)) + " got " + new String(Hex.encode(out)));
        }

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        mac.init(kGen.generateKey());


        mac.update(message);


        out = mac.doFinal();
    }


    private void testExceptions()
        throws Exception
    {

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        mac.update(input0, 0, input0.length);


        byte[] out = new byte[mac.getMacLength()];


        mac.doFinal(out, 0);


        if (!areEqual(out, output_k128_m0))
        {
            fail("Failed - expected " + new String(Hex.encode(output_k128_m0))
                + " got " + new String(Hex.encode(out)));

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