declaresChecksums(
                    sha1: getChecksum(foo, "sha1"),
                    sha512: getChecksum(foo, "sha512")
                )
            }
            artifact("foo-1.0.pom") {
                declaresChecksums(
                    sha1: getChecksum(foo, "sha1", "pom"),
                    sha512: getChecksum(foo, "sha512", "pom")
                )
            }
        }
    }

  - On artifact foo-1.0.jar (org:foo:1.0) in repository 'maven': expected a 'sha1' checksum of 'invalid' but was '${getChecksum(foo, "sha1")}'
  - On artifact foo-1.0.pom (org:foo:1.0) in repository 'maven': expected a 'sha1' checksum of 'invalid' but was '${getChecksum(foo, "sha1", "pom")}'

                    this.serverSignature.getType(),
                    Hexdump.toHexString(this.serverSignature.getChecksum())));
        }

        byte checksum[] = PacMac.calculateMac(this.serverSignature.getType(), keys, checksumData);
        if ( !MessageDigest.isEqual(this.serverSignature.getChecksum(), checksum) ) {
            if ( log.isDebugEnabled() ) {
                log.debug(
                    String.format(

        this.baseDir = baseDir;
        this.checksumService = checksumService;
    }

    @Override
    public LocallyAvailableResource move(K key, File source) {
        return markAccessed(delegate.move(toPath(key, getChecksum(source)), source));
    }

    @Override
    public Set<? extends LocallyAvailableResource> search(K key) {
        return delegate.search(toPath(key, "*"));
    }

        this.serializer = serializer;
    }

    long getHashCode(K key) throws Exception {
        serializer.write(encoder, key);
        encoder.flush();
        return digestStream.getChecksum();
    }

    private static class MessageDigestStream extends OutputStream {
        MessageDigest messageDigest;

        private MessageDigestStream() {
            try {

		return errors.ErrCorruptCheckpoint
	}
	return nil
}

// New returns the Checksum of checkpoint data
func New(data interface{}) Checksum {
	return Checksum(getChecksum(data))
}

// Get returns calculated checksum of checkpoint data
func getChecksum(data interface{}) uint64 {
	hash := fnv.New32a()
	hashutil.DeepHashObject(hash, data)
	return uint64(hash.Sum32())

      <component group="org" name="foo" version="1.0">
         <artifact name="foo-1.0.jar">
            <sha256 value="${getChecksum(foo, "sha256")}" origin="Generated by Gradle" reason="A key couldn't be downloaded"/>
         </artifact>
         <artifact name="foo-1.0.pom">
            <sha256 value="${getChecksum(foo, "sha256", "pom")}" origin="Generated by Gradle" reason="A key couldn't be downloaded"/>
         </artifact>
      </component>

        return result;
    }

    ChecksumKind getChecksumKind() {
        return checksumKind;
    }

    public String getChecksum() {
        return checksum;
    }

    public void setChecksum(String checksum) {
        this.checksum = checksum;
    }

    @Override
    int getOrder() {
        return checksumKind.ordinal();
    }

    @Override

            throw new PACDecodingException("Malformed PAC signature", e);
        }
    }


    public int getType () {
        return this.type;
    }


    public byte[] getChecksum () {
        return this.checksum;
    }

            }
            assert md == null: "Didn't expect module $id to be present but it was"
        }
    }

    static String getChecksum(HttpModule module, String algo, String artifactType = 'jar', String classifier = null) {
        def file = module.getArtifact([type: artifactType, classifier: classifier]).file
        def function = Hashing.defaultFunction()