public List<String> getSignatureReferenceDigestMethods() {
        if (signatureReferenceDigestMethods == null) {
            this.signatureReferenceDigestMethods = defaultSignatureSigningConfiguration.getSignatureReferenceDigestMethods();
        }
        return signatureReferenceDigestMethods;
    }
<p>Getter for the field <code>signatureReferenceDigestMethods</code>.</p>

@return a {@link List} object
pac4j-saml/src/main/java/org/pac4j/saml/metadata/BaseSAML2MetadataGenerator.java