This class represents an X.509 Certificate Pair object, which is primarily used to hold a pair of cross certificates issued between Certification Authorities. The ASN.1 structure is listed below. The forward certificate of the CertificatePair contains a certificate issued to this CA by another CA. The reverse certificate of the CertificatePair contains a certificate issued by this CA to another CA. When both the forward and the reverse certificates are present in the CertificatePair, the issuer name in one certificate shall match the subject name in the other and vice versa, and the subject key in one certificate shall be capable of verifying the digital signature on the other certificate and vice versa. If a subject key in one certificate does not contain required key algorithm parameters, then the signature check involving that key is not done.<p>