Apache Commons Codec Source Code

Apache Commons Codec library provides implementations of common encoders and decoders such as Base64, Hex, Phonetic and URLs.

Apache Commons Codec Source Code files are provided in both binary packge (commons-codec-3.15-bin.zip) and source package (commons-codec-3.15-src.zip). You can download them at Apache Commons Codec Website.

Apache Commons Codec Source Code has no dependencies. You can compile it to generate your own version of Apache Commons Codec JAR file.

The source code of Apache Commons Codec 1.15 is provided below:

✍: FYIcenter


 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *      http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package org.apache.commons.codec.cli;

import java.io.File;
import java.io.IOException;
import java.nio.charset.Charset;
import java.security.MessageDigest;
import java.util.Arrays;
import java.util.Locale;

import org.apache.commons.codec.binary.Hex;
import org.apache.commons.codec.digest.DigestUtils;
import org.apache.commons.codec.digest.MessageDigestAlgorithms;

 * A minimal command line to run digest over files, directories or a string
 * @see #main(String[])
 * @since 1.11
public class Digest {

     * Runs the digest algorithm in {@code args[0]} on the file in {@code args[1]}. If there is no {@code args[1]}, use
     * standard input.
     * <p>
     * The algorithm can also be {@code ALL} or {@code *} to output one line for each known algorithm.
     * </p>
     * @param args
     *            {@code args[0]} is one of {@link MessageDigestAlgorithms} name,
     *            {@link MessageDigest} name, {@code ALL}, or {@code *}.
     *            {@code args[1+]} is a FILE/DIRECTORY/String.
     * @throws IOException if an error occurs
    public static void main(final String[] args) throws IOException {
        new Digest(args).run();

    private final String algorithm;
    private final String[] args;
    private final String[] inputs;

    private Digest(final String[] args) {
        if (args == null) {
            throw new IllegalArgumentException("args");
        if (args.length == 0) {
            throw new IllegalArgumentException(
                    String.format("Usage: java %s [algorithm] [FILE|DIRECTORY|string] ...", Digest.class.getName()));
        this.args = args;
        algorithm = args[0];
        if (args.length <= 1) {
            inputs = null;
        } else {
            inputs = new String[args.length -1];
            System.arraycopy(args, 1, inputs, 0, inputs.length);

    private void println(final String prefix, final byte[] digest) {
        println(prefix, digest, null);

    private void println(final String prefix, final byte[] digest, final String fileName) {
        // The standard appears to be to print
        // hex, space, then either space or '*' followed by file name
        // where '*' is used for binary files
        // shasum(1) has a -b option which generates " *" separator
        // we don't distinguish binary files at present
        System.out.println(prefix + Hex.encodeHexString(digest) + (fileName != null ? "  " + fileName : ""));

    private void run() throws IOException {
        if (algorithm.equalsIgnoreCase("ALL") || algorithm.equals("*")) {
        final MessageDigest messageDigest = DigestUtils.getDigest(algorithm, null);
        if (messageDigest != null) {
            run("", messageDigest);
        } else {
            run("", DigestUtils.getDigest(algorithm.toUpperCase(Locale.ROOT)));

    private void run(final String[] digestAlgorithms) throws IOException {
        for (final String messageDigestAlgorithm : digestAlgorithms) {
            if (DigestUtils.isAvailable(messageDigestAlgorithm)) {
                run(messageDigestAlgorithm + " ", messageDigestAlgorithm);

    private void run(final String prefix, final MessageDigest messageDigest) throws IOException {
        if (inputs == null) {
            println(prefix, DigestUtils.digest(messageDigest, System.in));
        for (final String source : inputs) {
            final File file = new File(source);
            if (file.isFile()) {
                println(prefix, DigestUtils.digest(messageDigest, file), source);
            } else if (file.isDirectory()) {
                final File[] listFiles = file.listFiles();
                if (listFiles != null) {
                    run(prefix, messageDigest, listFiles);
            } else {
                // use the default charset for the command-line parameter
                final byte[] bytes = source.getBytes(Charset.defaultCharset());
                println(prefix, DigestUtils.digest(messageDigest, bytes));

    private void run(final String prefix, final MessageDigest messageDigest, final File[] files) throws IOException {
        for (final File file : files) {
            if (file.isFile()) {
                println(prefix, DigestUtils.digest(messageDigest, file), file.getName());

    private void run(final String prefix, final String messageDigestAlgorithm) throws IOException {
        run(prefix, DigestUtils.getDigest(messageDigestAlgorithm));

    public String toString() {
        return String.format("%s %s", super.toString(), Arrays.toString(args));



Or download all of them as a single archive file:

File name: commons-codec-1.15-sources.jar
File size: 364441 bytes
Release date: 2020-09-01


Download and Install commons-codec-1.15-bin.zip

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