This a minor cleanup issue but these samples should not validate signature-enveloping-hmac-sha1-40.xml. This signature uses an insecure HMAC truncation length and since release 1.4.3, this signature causes a validation failure. See https://issues.apache.org/bugzilla/show_bug.cgi?id=47526 for more information. If you run the mega-sample target, you will see this exception embedded in the output: [java] org.apache.xml.security.signature.XMLSignatureException: HMACOutputLength must not be less than 160 [java] at org.apache.xml.security.algorithms.implementations.IntegrityHmac.engineVerify(Unknown Source) [java] at org.apache.xml.security.algorithms.SignatureAlgorithm.verify(Unknown Source) [java] at org.apache.xml.security.signature.XMLSignature.checkSignatureValue(Unknown Source) [java] at org.apache.xml.security.samples.signature.VerifyMerlinsExamplesFifteen.verifyHMAC(Unknown Source) [java] at org.apache.xml.security.samples.signature.VerifyMerlinsExamplesFifteen.main(Unknown Source)