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Factored Out ASN1_TIME Encoding and Decoding Methods. (#21489)
Added unit tests.
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| Original file line number | Diff line number | Diff line change |
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| /* | ||
| * | ||
| * Copyright (c) 2022 Project CHIP Authors | ||
| * All rights reserved. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
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| /** | ||
| * @file | ||
| * This file implements Abstract Syntax Notation One (ASN.1) Time functions. | ||
| * | ||
| */ | ||
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| #include <getopt.h> | ||
| #include <inttypes.h> | ||
| #include <limits.h> | ||
| #include <memory> | ||
| #include <stdint.h> | ||
| #include <string.h> | ||
| #include <unistd.h> | ||
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| #include <ctype.h> | ||
| #include <stdio.h> | ||
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| #include <lib/asn1/ASN1.h> | ||
| #include <lib/support/TimeUtils.h> | ||
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| namespace chip { | ||
| namespace ASN1 { | ||
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| namespace { | ||
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| /** | ||
| * @brief Parses the two first characters C-string interpreting its content as a two base-10 digits number. | ||
| * The C-string pointer is advansed by two characters. | ||
| */ | ||
| uint8_t atoi2(const char *& buf) | ||
| { | ||
| uint8_t val = static_cast<uint8_t>((buf[0] - '0') * 10 + (buf[1] - '0')); | ||
| buf += 2; | ||
| return val; | ||
| } | ||
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| /** | ||
| * @brief Converts two low significan base-10 digits of an integer value (val % 100) to a two character C-string. | ||
| * The C-string pointer is advansed by two characters. | ||
| */ | ||
| void itoa2(uint32_t val, char *& buf) | ||
| { | ||
| buf[1] = static_cast<char>('0' + (val % 10)); | ||
| val /= 10; | ||
| buf[0] = static_cast<char>('0' + (val % 10)); | ||
| buf += 2; | ||
| } | ||
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| } // anonymous namespace | ||
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| CHIP_ERROR ASN1UniversalTime::ImportFrom_ASN1_TIME_string(const CharSpan & asn1_time) | ||
| { | ||
| const char * p = asn1_time.data(); | ||
| const size_t size = asn1_time.size(); | ||
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| VerifyOrReturnError(p != nullptr, ASN1_ERROR_INVALID_STATE); | ||
| VerifyOrReturnError(size == kASN1UTCTimeStringLength || size == kASN1GeneralizedTimeStringLength, | ||
| ASN1_ERROR_UNSUPPORTED_ENCODING); | ||
| VerifyOrReturnError(p[size - 1] == 'Z', ASN1_ERROR_UNSUPPORTED_ENCODING); | ||
| for (size_t i = 0; i < size - 1; i++) | ||
| { | ||
| VerifyOrReturnError(isdigit(p[i]), ASN1_ERROR_INVALID_ENCODING); | ||
| } | ||
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| if (size == kASN1GeneralizedTimeStringLength) | ||
| { | ||
| Year = static_cast<uint16_t>(atoi2(p) * 100 + atoi2(p)); | ||
| } | ||
| else | ||
| { | ||
| Year = atoi2(p); | ||
| Year = static_cast<uint16_t>(Year + ((Year >= 50) ? 1900 : 2000)); | ||
| } | ||
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| Month = atoi2(p); | ||
| Day = atoi2(p); | ||
| Hour = atoi2(p); | ||
| Minute = atoi2(p); | ||
| Second = atoi2(p); | ||
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| VerifyOrReturnError(Month > 0 && Month <= kMonthsPerYear, ASN1_ERROR_INVALID_ENCODING); | ||
| VerifyOrReturnError(Day > 0 && Day <= kMaxDaysPerMonth, ASN1_ERROR_INVALID_ENCODING); | ||
| VerifyOrReturnError(Hour < kHoursPerDay, ASN1_ERROR_INVALID_ENCODING); | ||
| VerifyOrReturnError(Minute < kMinutesPerHour, ASN1_ERROR_INVALID_ENCODING); | ||
| VerifyOrReturnError(Second < kSecondsPerMinute, ASN1_ERROR_INVALID_ENCODING); | ||
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| return CHIP_NO_ERROR; | ||
| } | ||
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| CHIP_ERROR ASN1UniversalTime::ExportTo_ASN1_TIME_string(MutableCharSpan & asn1_time) const | ||
| { | ||
| char * p = asn1_time.data(); | ||
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| VerifyOrReturnError(p != nullptr, ASN1_ERROR_INVALID_STATE); | ||
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| // X.509/RFC5280 mandates that times before 2050 UTC must be encoded as ASN.1 UTCTime values, while | ||
| // times equal or greater than 2050 must be encoded as GeneralizedTime values. The only difference | ||
| // (in the context of X.509 DER) is that GeneralizedTimes are encoded with a 4 digit year, while | ||
| // UTCTimes are encoded with a two-digit year. | ||
| if (Year < 1950 || Year >= 2050) | ||
| { | ||
| VerifyOrReturnError(asn1_time.size() >= kASN1GeneralizedTimeStringLength, ASN1_ERROR_UNDERRUN); | ||
| itoa2(Year / 100, p); | ||
| } | ||
| else | ||
| { | ||
| VerifyOrReturnError(asn1_time.size() >= kASN1UTCTimeStringLength, ASN1_ERROR_UNDERRUN); | ||
| } | ||
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| itoa2(Year, p); | ||
| itoa2(Month, p); | ||
| itoa2(Day, p); | ||
| itoa2(Hour, p); | ||
| itoa2(Minute, p); | ||
| itoa2(Second, p); | ||
| *p = 'Z'; | ||
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| asn1_time.reduce_size(static_cast<size_t>(p - asn1_time.data() + 1)); | ||
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| return CHIP_NO_ERROR; | ||
| } | ||
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| } // namespace ASN1 | ||
| } // namespace chip |
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