94 lines
2.4 KiB
Dart
94 lines
2.4 KiB
Dart
import 'dart:typed_data';
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import 'package:pointycastle/asn1/asn1_encoding_rule.dart';
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import 'package:pointycastle/asn1/asn1_object.dart';
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import 'package:pointycastle/asn1/asn1_parser.dart';
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import 'package:pointycastle/asn1/asn1_tags.dart';
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import 'package:pointycastle/asn1/unsupported_asn1_encoding_rule_exception.dart';
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class ASN1Set extends ASN1Object {
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///
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/// The decoded string value
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///
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List<ASN1Object>? elements;
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///
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/// Create an [ASN1Set] entity with the given [elements].
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///
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ASN1Set({this.elements, int tag = ASN1Tags.SET}) : super(tag: tag);
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///
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/// Creates an [ASN1Set] entity from the given [encodedBytes].
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///
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ASN1Set.fromBytes(Uint8List super.encodedBytes) : super.fromBytes() {
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elements = [];
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var parser = ASN1Parser(valueBytes);
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while (parser.hasNext()) {
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elements!.add(parser.nextObject());
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}
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}
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///
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/// Encodes this ASN1Object depending on the given [encodingRule]
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///
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/// If no [ASN1EncodingRule] is given, ENCODING_DER will be used.
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///
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/// Supported encoding rules are :
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/// * [ASN1EncodingRule.ENCODING_DER]
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///
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/// Throws an [UnsupportedAsn1EncodingRuleException] if the given [encodingRule] is not supported.
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///
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@override
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Uint8List encode(
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{ASN1EncodingRule encodingRule = ASN1EncodingRule.ENCODING_DER}) {
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if (encodingRule != ASN1EncodingRule.ENCODING_DER) {
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throw UnsupportedAsn1EncodingRuleException(encodingRule);
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}
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valueBytes = Uint8List(0);
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valueByteLength = 0;
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if (elements != null) {
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valueByteLength = _childLength();
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valueBytes = Uint8List(valueByteLength!);
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var i = 0;
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for (var obj in elements!) {
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var b = obj.encode();
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valueBytes!.setRange(i, i + b.length, b);
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i += b.length;
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}
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}
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return super.encode();
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}
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///
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/// Calculate encoded length of all children
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///
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int _childLength() {
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var l = 0;
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for (var obj in elements!) {
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l += obj.encode().length;
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}
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return l;
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}
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///
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/// Adds the given [obj] to the [elements] list.
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///
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void add(ASN1Object obj) {
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elements ??= [];
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elements!.add(obj);
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}
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@override
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String dump({int spaces = 0}) {
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var sb = StringBuffer();
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for (var i = 0; i < spaces; i++) {
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sb.write(' ');
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}
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sb.write('SET (${elements!.length} elem)');
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for (var e in elements!) {
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var dump = e.dump(spaces: spaces + dumpIndent);
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sb.write('\n$dump');
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}
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return sb.toString();
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}
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}
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