Extensions are represented as a sequence of the extension identifier (Object Identifier), a boolean flag stating whether the extension is to be treated as being critical and the extension value itself (this is again a DER encoding of the extension value).
The ASN.1 syntax for this is:
SubjectAltName ::= GeneralNames GeneralNames ::= SEQUENCE SIZE (1..MAX) OF GeneralName@author Amit Kapoor @author Hemma Prafullchandra @see Extension @see CertAttrSet
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