[1] RFC 5280 - Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile ( 版) <http://tools.ietf.org/html/rfc5280#section-3.2>
Self-issued certificates are CA certificates in which
the issuer and subject are the same entity.
[2] RFC 5280 - Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile ( 版) <http://tools.ietf.org/html/rfc5280#section-4.1.2.4>
If the names in the issuer and subject field in a
certificate match according to the rules specified in Section 7.1,
then the certificate is self-issued.