Identifiers:
   http://www.w3.org/2007/05/xmldsig-more#sha3-224
   http://www.w3.org/2007/05/xmldsig-more#sha3-256
   http://www.w3.org/2007/05/xmldsig-more#sha3-384
   http://www.w3.org/2007/05/xmldsig-more#sha3-512