79 lines
2.7 KiB
Dart
79 lines
2.7 KiB
Dart
import 'dart:convert';
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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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class ASN1GeneralizedTime extends ASN1Object {
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// The decoded date value
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DateTime? dateTimeValue;
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///
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/// Create an [ASN1GeneralizedTime] entity with the given BigInt [dateTimeValue].
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///
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ASN1GeneralizedTime(this.dateTimeValue, {int tag = ASN1Tags.GENERALIZED_TIME})
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: super(tag: tag);
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///
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/// Creates an [ASN1GeneralizedTime] entity from the given [encodedBytes].
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///
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ASN1GeneralizedTime.fromBytes(Uint8List super.bytes) : super.fromBytes() {
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var octets = valueBytes!;
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var stringValue = ascii.decode(octets);
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var year = stringValue.substring(0, 4);
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var month = stringValue.substring(4, 6);
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var day = stringValue.substring(6, 8);
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var hour = stringValue.substring(8, 10);
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var minute = stringValue.substring(10, 12);
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var second = stringValue.substring(12, 14);
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if (stringValue.length > 14) {
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var timeZone = stringValue.substring(14, stringValue.length);
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dateTimeValue =
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DateTime.parse('$year-$month-$day $hour:$minute:$second$timeZone');
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} else {
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dateTimeValue = DateTime.parse('$year-$month-$day $hour:$minute:$second');
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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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var utc = dateTimeValue!.toUtc();
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var year = utc.year.toString();
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var month = utc.month.toString();
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var day = utc.day.toString();
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var hour = utc.hour.toString();
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var minute = utc.minute.toString();
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var second = utc.second.toString();
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// Encode string to YYMMDDhhmm[ss]Z
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var utcString = '$year$month$day$hour$minute${second}Z';
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valueBytes = ascii.encode(utcString);
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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('GENERALIZEDTIME ${dateTimeValue!.toIso8601String()}');
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return sb.toString();
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}
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}
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