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.

            key = this.key;
        }
        Mac mac = Mac.getInstance(MAC_NAME);
        mac.init(key);
        byte[] text = baseString.getBytes(ENCODING);
        return mac.doFinal(text);
    }


    /** ISO-8859-1 or US-ASCII would work, too. */
    private static final String ENCODING = OAuth.ENCODING;

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    String message = "/" + restInvocation.getPath() + "\000" + restInvocation.getRequestBody();


    Mac mac = getMac();
    mac.update(message.getBytes());


    return Base64.encodeBytes((String.format("%064x", new BigInteger(1, mac.doFinal())).getBytes()));
  }
}

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    byte[] key = secret.getBytes();
    SecretKey hmacKey = new SecretKeySpec(key, "HMACSHA256");
    Mac mac = Mac.getInstance("HMACSHA256");
    mac.init(hmacKey);
    byte[] digest = mac.doFinal(encoded_envelope.getBytes());


    return envelope;


  }

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            // Create the message authentication code (MAC)
            Mac mac = Mac.getInstance("HmacSHA1");
            mac.init(signingKey);


            // Compute the HMAC value
            result = mac.doFinal(source.getBytes());
        } catch (NoSuchAlgorithmException nsae) {
            throw new RuntimeException(
                    "Could not find the SHA-1 algorithm. HMac conversion failed.",
                    nsae);
        } catch (InvalidKeyException ike) {

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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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        key.setTryWrongPKCS12Zero(wrongPkcs12Zero);


        Mac mac = Mac.getInstance(oid.getId(), "BC");
        mac.init(key, defParams);
        mac.update(data);
        return mac.doFinal();
    }
    
    public static class BCPKCS12KeyStore
        extends JDKPKCS12KeyStore
    {

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


        out = mac.doFinal();


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

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        try {
            SecretKeySpec signingKey = new SecretKeySpec(stringToBytes(key),
                    SIGNATURE_METHOD);
            Mac mac = Mac.getInstance(SIGNATURE_METHOD);
            mac.init(signingKey);
            byte[] rawSignature = mac.doFinal(stringToBytes(data));
            result = bytesToString(encode(rawSignature));
            result = result.trim();
        } catch (Exception e) {
            throw new SignatureException("Failed to generate HMAC : "
                    + e.getMessage());

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            mac.init(key);


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


            byte[] out = mac.doFinal();
            if (!areEqual(out, ref))
            {
                fail("Failed - expected " + new String(Hex.encode(ref)) + " got " + new String(Hex.encode(out)));
            }
        }

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