ECParameters
ECParameters ::= CHOICE { namedCurve OBJECT IDENTIFIER -- implicitCurve NULL -- specifiedCurve SpecifiedECDomain } -- implicitCurve and specifiedCurve MUST NOT be used in PKIX. -- Details for SpecifiedECDomain can be found in [X9.62]. -- Any future additions to this CHOICE should be coordinated -- with ANSI X9.
Extension
A certificate using system MUST reject the certificate if it encounters a critical extension it does not recognize; however, a non-critical extension may be ignored if it is not recognized.
PublicKeyInfo
this format is not formally defined anywhere but is none-the-less the form you get when you do "openssl rsa -in private.pem -outform PEM -pubout"
RDNSequence
In practice, RDNs containing multiple name-value pairs (called "multivalued RDNs") are rare, but they can be useful at times when either there is no unique attribute in the entry or you want to ensure that the entry's DN contains some useful identifying information.
RelativeDistinguishedName
In practice, RDNs containing multiple name-value pairs (called "multivalued RDNs") are rare, but they can be useful at times when either there is no unique attribute in the entry or you want to ensure that the entry's DN contains some useful identifying information.