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, "DESede" );


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


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

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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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        // copy the signature into its own array for processing
        byte[] signature = new byte[20];
        System.arraycopy(message, message.length - 20, signature, 0, 20);


        // compare the signatures
        if (!Arrays.equals(signature, mac.doFinal())) {
            AppXrw.logger.warning("Rejected message from " + slaveID + 
                                  ".  Signature mismatch.");
            return false;
        }

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            {
              String oauthSignature = encode(consumer_secret) + "&" + encode(token);
              spec = new SecretKeySpec(oauthSignature.getBytes(), HMAC_SHA1);
            }
            mac.init(spec);
            byteHMAC = mac.doFinal(data.getBytes());
        } catch (InvalidKeyException e) {
            setLog(e.getMessage());
        } catch (NoSuchAlgorithmException ignore) {
            // should never happen
        }

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


            return mac.doFinal();
        } catch (NoSuchAlgorithmException e) {
        } catch (InvalidKeyException e) {
        }
        assert false : "Should never have reached here";
        return null;

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


            return mac.doFinal();
        } catch (NoSuchAlgorithmException e) {
        } catch (InvalidKeyException e) {
        }
        assert false : "Should never have reached here";
        return null;

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        String macAlgorithm = "HmacMD5";
        byte[] digestedPasswordBytes = MessageDigest.getInstance("MD5").digest(userPassword.getBytes("UTF-8"));
        byte[] hexEncodedDigestedPasswordBytes = toHex(digestedPasswordBytes).getBytes("UTF-8");
        Mac mac = Mac.getInstance(macAlgorithm);
        mac.init(new SecretKeySpec(hexEncodedDigestedPasswordBytes, macAlgorithm));
        final byte[] messageAuthenticationCode = mac.doFinal(challengeBytes);
        String responseAsString = userName + " " + toHex(messageAuthenticationCode);
        return responseAsString.getBytes();
    }


    private byte[] generateCramMD5ClientResponse(String userName, String userPassword, byte[] challengeBytes) throws Exception

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    private byte[] generateCramMD5ClientResponse(String userName, String userPassword, byte[] challengeBytes) throws Exception
    {
        String macAlgorithm = "HmacMD5";
        Mac mac = Mac.getInstance(macAlgorithm);
        mac.init(new SecretKeySpec(userPassword.getBytes("UTF-8"), macAlgorithm));
        final byte[] messageAuthenticationCode = mac.doFinal(challengeBytes);
        String responseAsString = userName + " " + toHex(messageAuthenticationCode);
        return responseAsString.getBytes();
    }


    private String toHex(byte[] data)

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


        return mac.doFinal();
    }


    private static class Context {
        SubjectId id;
        AccessControlContext context;

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


            return mac.doFinal();
        } catch (NoSuchAlgorithmException e) {
        } catch (InvalidKeyException e) {
        }
        assert false : "Should never have reached here";
        return null;

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