def encrypt(self, req, receiver='<STR_LIT>', iss='<STR_LIT>', lifetime=<NUM_LIT:0>,<EOL>enc_enc="<STR_LIT>", enc_alg="<STR_LIT>", aud=None):
return self.pack(req=req, receiver=receiver, iss=iss, lifetime=lifetime,<EOL>sign=False, encrypt=True, enc_enc=enc_enc,<EOL>enc_alg=enc_alg)<EOL>
:param req: Original metadata statement as a
    :py:class:`MetadataStatement` instance
:param receiver: The intended audience for the JWS
:param iss:
:param lifetime:
:param enc_alg:
:param enc_enc:
:param aud: The audience, a list of receivers.
:return: A dictionary with a signed JWT as value with the key 'sms'