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.

            SecretKey sk = new SecretKeySpec( key, "AES" );


            Mac mac = Mac.getInstance( "HmacSHA1" );
            mac.init( sk );


            return mac.doFinal( data );
        }
        catch ( GeneralSecurityException nsae )
        {
            nsae.printStackTrace();
            return null;

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            SecretKey sk = new SecretKeySpec( key, "DESede" );


            Mac mac = Mac.getInstance( "HmacSHA1" );
            mac.init( sk );


            return mac.doFinal( data );
        }
        catch ( GeneralSecurityException nsae )
        {
            nsae.printStackTrace();
            return null;

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            SecretKey sk = new SecretKeySpec( key, "ARCFOUR" );


            Mac mac = Mac.getInstance( "HmacMD5" );
            mac.init( sk );


            return mac.doFinal( data );
        }
        catch ( GeneralSecurityException nsae )
        {
            nsae.printStackTrace();
            return null;

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    public byte[] calculateIntegrity( byte[] data, byte[] key, KeyUsage usage )
    {
        try
        {
            Mac digester = Mac.getInstance( "HmacMD5" );
            return digester.doFinal( data );
        }
        catch ( NoSuchAlgorithmException nsae )
        {
            return null;
        }

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        KeyGenerator kg = KeyGenerator.getInstance( "HmacMD5" );
        SecretKey sk = kg.generateKey();


        Mac mac = Mac.getInstance( "HmacMD5" );
        mac.init( sk );
        byte[] result = mac.doFinal( "Hello world!".getBytes() );


        assertEquals( "HmacMD5 size", 16, result.length );
    }

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        KeyGenerator kg = KeyGenerator.getInstance( "HmacSHA1" );
        SecretKey sk = kg.generateKey();


        Mac mac = Mac.getInstance( "HmacSHA1" );
        mac.init( sk );
        byte[] result = mac.doFinal( "Hi There".getBytes() );


        assertEquals( "HmacSHA1 size", 20, result.length );
    }

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            //EtM Composition Approach
            int macLenght = mac.getMacLength();
            byte[] secure = new byte[cipher.getOutputSize(insecure.length)+ macLenght];
            int secureCount = cipher.doFinal(insecure,0,insecure.length,secure);
            mac.update(secure, 0, secureCount);
            mac.doFinal(secure, secureCount);
                        
            return secure;
        }
        catch (Exception e)
        {

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            }


            //EtM Composition Approach
            int macLenght = mac.getMacLength();
            mac.update(secure, 0, secure.length-macLenght);
            byte[] signedDigestHash = mac.doFinal();


            boolean isMacEqual = true;
            for (int i = 0; i < signedDigestHash.length; i++)
            {
                if (signedDigestHash[i] != secure[secure.length-macLenght+i])

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        Mac mac = Mac.getInstance(algorithm);
        mac.init(key);
        mac.update(bytes);


        return mac.doFinal();
    }


}

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  public static byte[] hmacSha1(byte[] input, byte[] key) {
    try {
      SecretKey secretKey = new SecretKeySpec(key, HMACSHA1);
      Mac mac = Mac.getInstance(HMACSHA1);
      mac.init(secretKey);
      return mac.doFinal(input);
    } catch (GeneralSecurityException e) {
      throw ExceptionUtils.unchecked(e);
    }
  }

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