100 lines
2.3 KiB
Dart
100 lines
2.3 KiB
Dart
import 'dart:typed_data';
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import 'x509_certificate.dart';
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import 'asn1_identifier.dart';
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import 'oid.dart';
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class ASN1Object {
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/// This property contains the DER encoded object
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Uint8List encoded;
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/// This property contains the decoded Swift object whenever is possible
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dynamic value;
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ASN1Identifier identifier;
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List<ASN1Object> sub;
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ASN1Object parent;
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ASN1Object subAtIndex(int index) {
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if (sub != null && index >= 0 && index < sub.length) {
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return sub[index];
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}
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return null;
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}
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ASN1Object firstSub() {
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if (subCount() > 0) {
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return sub.first;
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}
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return null;
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}
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ASN1Object lastSub() {
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if (subCount() > 0) {
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return sub.last;
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}
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return null;
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}
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int subCount() {
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return sub?.length ?? 0;
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}
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ASN1Object findOid({OID oid, String oidValue}) {
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oidValue = oid != null ? oid.toValue() : oidValue;
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for (var child in (sub ?? <ASN1Object>[])) {
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if (child.identifier?.tagNumber() ==
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ASN1IdentifierTagNumber.OBJECT_IDENTIFIER) {
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if (child.value == oidValue) {
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return child;
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}
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} else {
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var result = child.findOid(oidValue: oidValue);
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if (result != null) {
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return result;
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}
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}
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}
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return null;
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}
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String get description {
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return printAsn1();
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}
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String printAsn1({insets = ""}) {
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var output = insets;
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output += identifier?.description?.toUpperCase() ?? "";
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output += (value != null ? ": $value" : "");
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if (identifier?.typeClass() == ASN1IdentifierClass.UNIVERSAL &&
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identifier?.tagNumber() == ASN1IdentifierTagNumber.OBJECT_IDENTIFIER) {
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var descr = OID.fromValue(value?.toString() ?? "")?.name();
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if (descr != null) {
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output += " ($descr)";
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}
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}
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output += sub != null && sub.length > 0 ? " {" : "";
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output += "\n";
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for (var item in (sub ?? <ASN1Object>[])) {
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output += item.printAsn1(insets: insets + " ");
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}
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output += sub != null && sub.length > 0 ? "}\n" : "";
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return output;
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}
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@override
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String toString() {
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return description;
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}
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ASN1Object atIndex(X509BlockPosition x509blockPosition) {
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if (sub != null && x509blockPosition.index < sub.length) {
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return sub[x509blockPosition.index];
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}
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return null;
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}
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}
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