question: public static void validateMacTag ( String participantId , String partnerParticipantId , BigInteger gx1 , BigInteger gx2 , BigInteger gx3 , BigInteger gx4 , BigInteger keyingMaterial , Digest digest , BigInteger partnerMacTag ) throws CryptoException { BigInteger expectedMacTag = calculateMacTag ( partnerParticipantId , participantId , gx3 , gx4 , gx1 , gx2 , keyingMaterial , digest ) ; if ( ! expectedMacTag . equals ( partnerMacTag ) ) { throw new CryptoException ( "Partner MacTag validation failed. " + "Therefore, the password, MAC, or digest algorithm of each participant does not match." ) ; } }
target:  Validates the MacTag received from the partner participant.