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~~ 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
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~~ specific language governing permissions and limitations
~~ under the License.

  ------
  Require Files Checksum
  ------
  Edward Samson, Lyubomyr Shaydariv
  ------
  February 2016
  ------

Require Files Checksum

  This rule checks that the specified file has an given checksum.


   The following parameters are supported by this rule:

   * message - an optional message to the user if the rule fails.

   * file - A file to check.

   * checksum - Expected file checksum.

   * type - Type of hashing algorithm to calculate the checksum. May be one of "md5", "sha1", "sha256", "sha384", or "sha512".

   []


  Sample Plugin Configuration:

+---+
<project>
  [...]
  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-enforcer-plugin</artifactId>
        <version>${project.version}</version>
        <executions>
          <execution>
            <id>enforce-checksum</id>
            <goals>
              <goal>enforce</goal>
            </goals>
            <configuration>
              <rules>
                <requireFileChecksum>
                  <file>${project.build.outputDirectory}/foo.txt</file>
                  <checksum>d41d8cd98f00b204e9800998ecf8427e</checksum>
                  <type>md5</type>
                </requireFileChecksum>
                <requireFileChecksum>
                  <file>${project.build.outputDirectory}/bar.txt</file>
                  <checksum>da39a3ee5e6b4b0d3255bfef95601890afd80709</checksum>
                  <type>sha1</type>
                </requireFileChecksum>
                <requireFileChecksum>
                  <file>${project.build.outputDirectory}/baz.txt</file>
                  <checksum>e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855</checksum>
                  <type>sha256</type>
                </requireFileChecksum>
                <requireFileChecksum>
                  <file>${project.build.outputDirectory}/qux.txt</file>
                  <checksum>38b060a751ac96384cd9327eb1b1e36a21fdb71114be07434c0cc7bf63f6e1da274edebfe76f65fbd51ad2f14898b95b</checksum>
                  <type>sha384</type>
                </requireFileChecksum>
                <requireFileChecksum>
                  <file>${project.build.outputDirectory}/quux.txt</file>
                  <checksum>cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e</checksum>
                  <type>sha512</type>
                </requireFileChecksum>
              </rules>
              <fail>true</fail>
            </configuration>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>
  [...]
</project>
+---+