72 lines
2.1 KiB
Dart
72 lines
2.1 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_tags.dart';
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import 'package:pointycastle/asn1/unsupported_asn1_encoding_rule_exception.dart';
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import 'package:pointycastle/src/utils.dart';
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class ASN1Integer extends ASN1Object {
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///
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/// The integer value
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///
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BigInt? integer;
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///
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/// Create an [ASN1Integer] entity with the given BigInt [integer].
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///
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ASN1Integer(this.integer, {int tag = ASN1Tags.INTEGER}) : super(tag: tag);
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///
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/// Create an [ASN1Integer] entity with the given int [i].
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///
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ASN1Integer.fromtInt(int i, {int tag = ASN1Tags.INTEGER}) : super(tag: tag) {
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integer = BigInt.from(i);
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}
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///
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/// Creates an [ASN1Integer] entity from the given [encodedBytes].
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///
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ASN1Integer.fromBytes(Uint8List super.encodedBytes) : super.fromBytes() {
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integer = decodeBigInt(valueBytes!);
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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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if (integer!.bitLength == 0) {
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if (integer == BigInt.from(-1)) {
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valueBytes = Uint8List.fromList([0xff]);
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} else {
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valueBytes = Uint8List.fromList([0]);
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}
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} else {
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valueBytes = encodeBigInt(integer);
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}
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valueByteLength = valueBytes!.length;
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return super.encode();
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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('INTEGER ${integer.toString().toUpperCase()}');
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return sb.toString();
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}
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}
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