src/main/java/org/apache/commons/io/input/MessageDigestCalculatingInputStream.java [145:165]:
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    public static class MessageDigestMaintainingObserver extends Observer {
        private final MessageDigest messageDigest;

        /**
         * Constructs an MessageDigestMaintainingObserver for the given MessageDigest.
         *
         * @param messageDigest the message digest to use
         * @throws NullPointerException if messageDigest is null.
         */
        public MessageDigestMaintainingObserver(final MessageDigest messageDigest) {
            this.messageDigest = Objects.requireNonNull(messageDigest, "messageDigest");
        }

        @Override
        public void data(final byte[] input, final int offset, final int length) throws IOException {
            messageDigest.update(input, offset, length);
        }

        @Override
        public void data(final int input) throws IOException {
            messageDigest.update((byte) input);
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src/main/java/org/apache/commons/io/input/MessageDigestInputStream.java [148:169]:
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    public static class MessageDigestMaintainingObserver extends Observer {

        private final MessageDigest messageDigest;

        /**
         * Constructs an MessageDigestMaintainingObserver for the given MessageDigest.
         *
         * @param messageDigest the message digest to use
         * @throws NullPointerException if messageDigest is null.
         */
        public MessageDigestMaintainingObserver(final MessageDigest messageDigest) {
            this.messageDigest = Objects.requireNonNull(messageDigest, "messageDigest");
        }

        @Override
        public void data(final byte[] input, final int offset, final int length) throws IOException {
            messageDigest.update(input, offset, length);
        }

        @Override
        public void data(final int input) throws IOException {
            messageDigest.update((byte) input);
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