Extension.fromAsn1 constructor

Extension.fromAsn1(ASN1Sequence sequence)

Creates a Extension from an ASN1Sequence.

The ASN.1 definition is:

Extension ::= SEQUENCE { extnID OBJECT IDENTIFIER, critical BOOLEAN DEFAULT FALSE, extnValue OCTET STRING -- contains the DER encoding of an ASN.1 value -- corresponding to the extension type identified -- by extnID }

Implementation

factory Extension.fromAsn1(ASN1Sequence sequence) {
  var id = toDart(sequence.elements[0]);
  var critical = false;
  var octetIndex = 1;
  if (sequence.elements.length > 2) {
    critical = toDart(sequence.elements[1]);
    octetIndex = 2;
  }
  return Extension(
      extnId: id,
      isCritical: critical,
      extnValue: ExtensionValue.fromAsn1(
          ASN1Parser(sequence.elements[octetIndex].contentBytes()!)
              .nextObject(),
          id));
}