Examples of javax.crypto.Mac.update()

javax.crypto.Mac.update()
Updates this {@code Mac} instance with the specified byte. @param input the byte @throws IllegalStateException if this MAC is not initialized.

        }


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


            return mac.doFinal();
        } catch (NoSuchAlgorithmException e) {
            //shouldn't happen
        } catch (InvalidKeyException e) {

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        byte[] b = new byte[20];
        random.nextBytes(b);
        final SecretKey secretKey = new SecretKeySpec(b, HMAC_SHA1);
        final Mac m = Mac.getInstance(HMAC_SHA1);
        m.init(secretKey);
        m.update(UTF_8.getBytes(UTF_8));
        m.doFinal();
    }


    /**
     * @param expires

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        String cookiePayload = String.valueOf(token) + String.valueOf(expires)
            + "@" + userId;
        Mac m = Mac.getInstance(HMAC_SHA1);
        m.init(key);
        m.update(cookiePayload.getBytes(UTF_8));
        String cookieValue = byteToHex(m.doFinal());
        return cookieValue + "@" + cookiePayload;
    }


    /**

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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) {

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            throw new CHKDecodeException("Invalid size: "+size);
        }
        // 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,

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        }
    try {
        // 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?");
        }

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    try {
        // 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) {

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        Mac hmac = Mac.getInstance("HmacSHA256", hmacProvider);
        hmac.init(new SecretKeySpec(encKey, "HmacSHA256"));
        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)

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        hmac.init(new SecretKeySpec(encKey, "HmacSHA256"));
        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);

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        Mac hmac = Mac.getInstance("HmacSHA256", hmacProvider);
        hmac.init(new SecretKeySpec(encKey, "HmacSHA256"));
        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)

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