system/serenity
system/serenity
1
0
Fork 0
mirror of https://github.com/SerenityOS/serenity synced 2024-10-14 20:03:29 +00:00
Code Issues Packages Projects Releases Wiki Activity

LibCrypto: Implement UTCTime and GeneralizedTime parsers

Browse source
This commit is contained in:
AnotherTest 2021-04-18 13:44:36 +04:30 committed by Andreas Kling
parent 39997e2ab1
commit 13abbc5ea8
2 changed files with 118 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

114
Userland/Libraries/LibCrypto/ASN1/ASN1.cpp
View file

@ -92,4 +92,118 @@ String type_name(Type type)
return "InvalidType";
}
Optional<Core::DateTime> parse_utc_time(const StringView& time)
{
// YYMMDDhhmm[ss]Z or YYMMDDhhmm[ss](+|-)hhmm
GenericLexer lexer(time);
auto year_in_century = lexer.consume(2).to_uint();
auto month = lexer.consume(2).to_uint();
auto day = lexer.consume(2).to_uint();
auto hour = lexer.consume(2).to_uint();
auto minute = lexer.consume(2).to_uint();
Optional<unsigned> seconds, offset_hours, offset_minutes;
[[maybe_unused]] bool negative_offset = false;
if (!lexer.next_is('Z')) {
if (!lexer.next_is(is_any_of("+-"))) {
seconds = lexer.consume(2).to_uint();
if (!seconds.has_value()) {
return {};
}
}
if (lexer.next_is(is_any_of("+-"))) {
negative_offset = lexer.consume() == '-';
offset_hours = lexer.consume(2).to_uint();
offset_minutes = lexer.consume(2).to_uint();
if (!offset_hours.has_value() || !offset_minutes.has_value()) {
return {};
}
} else {
lexer.consume();
}
} else {
lexer.consume();
}
if (!year_in_century.has_value() || !month.has_value() || !day.has_value() || !hour.has_value() || !minute.has_value()) {
return {};
}
auto full_year = (Core::DateTime::now().year() / 100) * 100 + year_in_century.value();
auto full_seconds = seconds.value_or(0);
// FIXME: Handle offsets!
if (offset_hours.has_value() || offset_minutes.has_value())
dbgln("FIXME: Implement UTCTime with offset!");
return Core::DateTime::create(full_year, month.value(), day.value(), hour.value(), minute.value(), full_seconds);
}
Optional<Core::DateTime> parse_generalized_time(const StringView& time)
{
// YYYYMMDDhh[mm[ss[.fff]]] or YYYYMMDDhh[mm[ss[.fff]]]Z or YYYYMMDDhh[mm[ss[.fff]]](+|-)hhmm
GenericLexer lexer(time);
auto year = lexer.consume(4).to_uint();
auto month = lexer.consume(2).to_uint();
auto day = lexer.consume(2).to_uint();
auto hour = lexer.consume(2).to_uint();
Optional<unsigned> minute, seconds, miliseconds, offset_hours, offset_minutes;
[[maybe_unused]] bool negative_offset = false;
if (!lexer.is_eof()) {
if (lexer.consume_specific('Z'))
goto done_parsing;
if (!lexer.next_is(is_any_of("+-"))) {
minute = lexer.consume(2).to_uint();
if (!minute.has_value()) {
return {};
}
if (lexer.consume_specific('Z'))
goto done_parsing;
}
if (!lexer.next_is(is_any_of("+-"))) {
seconds = lexer.consume(2).to_uint();
if (!seconds.has_value()) {
return {};
}
if (lexer.consume_specific('Z'))
goto done_parsing;
}
if (lexer.consume_specific('.')) {
miliseconds = lexer.consume(3).to_uint();
if (!miliseconds.has_value()) {
return {};
}
if (lexer.consume_specific('Z'))
goto done_parsing;
}
if (lexer.next_is(is_any_of("+-"))) {
negative_offset = lexer.consume() == '-';
offset_hours = lexer.consume(2).to_uint();
offset_minutes = lexer.consume(2).to_uint();
if (!offset_hours.has_value() || !offset_minutes.has_value()) {
return {};
}
} else {
lexer.consume();
}
}
done_parsing:;
if (!year.has_value() || !month.has_value() || !day.has_value() || !hour.has_value()) {
return {};
}
// FIXME: Handle offsets!
if (offset_hours.has_value() || offset_minutes.has_value())
dbgln("FIXME: Implement GeneralizedTime with offset!");
// Unceremonially drop the miliseconds on the floor.
return Core::DateTime::create(year.value(), month.value(), day.value(), hour.value(), minute.value_or(0), seconds.value_or(0));
}
}

4
Userland/Libraries/LibCrypto/ASN1/ASN1.h
View file

@ -27,6 +27,7 @@
#pragma once
#include <AK/Types.h>
#include <LibCore/DateTime.h>
#include <LibCrypto/BigInt/UnsignedBigInteger.h>
namespace Crypto::ASN1 {
@ -71,4 +72,7 @@ String kind_name(Kind);
String class_name(Class);
String type_name(Type);
Optional<Core::DateTime> parse_utc_time(const StringView&);
Optional<Core::DateTime> parse_generalized_time(const StringView&);
}