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Return values from CMPv2 client
CMPv2 client returns:
either 3 values:
java.security.cert.X509Certificate endCertificate
List <java.security.cert.X509Certificate> extraCerts
List <java.security.cert.X509Certificate> caPubs
Or 2 values:
List <java.security.cert.X509Certificate> certificateChain
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