)

func init() {
	crypto.RegisterHash(crypto.MD5, New)
}

// The size of an MD5 checksum in bytes.
const Size = 16

// The blocksize of MD5 in bytes.
const BlockSize = 64

const (
	init0 = 0x67452301
	init1 = 0xEFCDAB89
	init2 = 0x98BADCFE
	init3 = 0x10325476
)

// digest represents the partial evaluation of a checksum.
type digest struct {
	s   [4]uint32
	x   [BlockSize]byte
	nx  int
	len uint64

        when:
        run "checkDeps"

        then:
        resolve.expectGraph {
            root(":", ":test:") {
                module("org.gradle:test:1.45") {
                    module("org.gradle.dep:dep_module:1.1")
                }
            }
        }

        when:
        server.resetExpectations()
        run "checkDeps"

        then:

            log.trace(
                String.format(
                    "Checksum data %s type %d signature %s",
                    Hexdump.toHexString(checksumData),
                    this.serverSignature.getType(),
                    Hexdump.toHexString(this.serverSignature.getChecksum())));
        }

        byte checksum[] = PacMac.calculateMac(this.serverSignature.getType(), keys, checksumData);

    }

    public File whereIs(K key, String checksum) {
        return new File(baseDir, toPath(key, checksum));
    }

    @Override
    public LocallyAvailableResource add(K key, Action<File> addAction) {
        //We cannot just delegate to the add method as we need the file content for checksum calculation here
        //and reexecuting the action isn't acceptable

            }
        """

        when:
        repositoryInteractions {
            'org:module:1.0' {
                expectResolve()
            }
        }
        run ':checkDeps'

        then:
        outputContains 'Rule from settings applied on org:module:1.0'
    }

    def "can declare component metadata rules in settings using registar"() {
        settingsFile << """

	Settings []BuildSetting
}

// A Module describes a single module included in a build.
type Module struct {
	Path    string  // module path
	Version string  // module version
	Sum     string  // checksum
	Replace *Module // replaced by this module
}

// A BuildSetting is a key-value pair describing one setting that influenced a build.
//
// Defined keys include:
//

        dep.getArtifact().expectGet()

        when:
        succeeds "checkDeps"

        then:
        resolve.expectGraph {
            root(":", ":test:") {
                module("org.gradle:test:1.45")
            }
        }

        when:
        // Need to check twice to use the cached version too
        succeeds "checkDeps"

        then:
        resolve.expectGraph {

            'cglib:cglib-nodep:3.2.5' {
                expectGetMetadata()
            }
            'cglib:cglib:3.2.5' {
                expectGetMetadata()
            }
        }
        fails ':checkDeps'

        then:
        def variant = 'runtime'
        if (!isGradleMetadataPublished() && useIvy()) {
            variant = 'default'
        }

  /**
   * Returns a hash function implementing the CRC-32 checksum algorithm (32 hash bits).
   *
   * <p>To get the {@code long} value equivalent to {@link Checksum#getValue()} for a {@code
   * HashCode} produced by this function, use {@link HashCode#padToLong()}.
   *
   * <p>This function is best understood as a <a
   * href="https://en.wikipedia.org/wiki/Checksum">checksum</a> rather than a true <a

            }

            dependencies {
                implementation libs.my.lib
            }

            tasks.register("checkDeps", CheckDeps) {
                input.from(configurations.runtimeClasspath)
            }

            class CheckDeps extends DefaultTask {
                @InputFiles
                final ConfigurableFileCollection input = project.objects.fileCollection()