-//
-// SecCFDER_CFDate.c
-// utilities
-//
-// Created by Michael Brouwer on 7/7/12.
-// Copyright (c) 2012 Apple Inc. All rights reserved.
-//
-
-#include "utilities/SecCFRelease.h"
-#include "utilities/der_date.h"
-#include "utilities/der_plist.h"
-#include "utilities/der_plist_internal.h"
-
-#include <corecrypto/ccder.h>
-#include <CoreFoundation/CoreFoundation.h>
-
-#include <math.h>
-
-#define NULL_TIME NAN
-
-CFAbsoluteTime SecCFGregorianDateGetAbsoluteTime(CFGregorianDate g, CFTimeInterval timeZoneOffset, CFErrorRef *error);
-CFGregorianDate SecCFAbsoluteTimeGetGregorianDate(CFAbsoluteTime at, CFTimeInterval timeZoneOffset, CFErrorRef *error);
-
-/* Cumalitive number of days in the year for months up to month i. */
-static int mdays[13] = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 };
-
-CFAbsoluteTime SecCFGregorianDateGetAbsoluteTime(CFGregorianDate g, CFTimeInterval timeZoneOffset, CFErrorRef *error) {
- int day = g.day;
- int is_leap_year = g.year % 4 == 0 && (g.year % 100 != 0 || g.year % 400 == 0) ? 1 : 0;
- if (g.month < 1 || g.month > 12 || day < 1 || day > 31 || g.hour >= 24 || g.minute >= 60 || g.second >= 60.0
- || (g.month == 2 && day > mdays[g.month] - mdays[g.month - 1] + is_leap_year)
- || (g.month != 2 && day > mdays[g.month] - mdays[g.month - 1])) {
- /* Invalid date. */
- SecCFDERCreateError(-1000, CFSTR("Invalid date."), 0, error);
- return NULL_TIME;
- }
-
- int dy = g.year - 2001;
- if (dy < 0) {
- dy += 1;
- day -= 1;
- }
-
- int leap_days = dy / 4 - dy / 100 + dy / 400;
- day += ((g.year - 2001) * 365 + leap_days) + mdays[g.month - 1] - 1;
- if (g.month > 2)
- day += is_leap_year;
-
-#if 0
- int64_t time = day;
- time *= 24;
- time += g.hour;
- time *= 60;
- time += g.minute;
- time *= 60;
- time += lrint(g.second);
- time -= lrint(timeZoneOffset);
- return time;
-#else
- CFAbsoluteTime absTime = (CFAbsoluteTime)((day * 24 + g.hour) * 60 + g.minute) * 60 + g.second;
- return absTime - timeZoneOffset;
-#endif
-}
-
-CFGregorianDate SecCFAbsoluteTimeGetGregorianDate(CFAbsoluteTime at, CFTimeInterval timeZoneOffset, CFErrorRef *error) {
- CFTimeZoneRef tz = CFTimeZoneCreateWithTimeIntervalFromGMT(0, timeZoneOffset);
- if (!tz) {
- SecCFDERCreateError(-1000, CFSTR("timezone creation failed."), 0, error);
- CFGregorianDate g = {};
- return g;
- } else {
- CFGregorianDate g = CFAbsoluteTimeGetGregorianDate(at, tz);
- CFRelease(tz);
- return g;
- }
-}
-
-
-static int der_get_char(const uint8_t **der_p, const uint8_t *der_end,
- CFErrorRef *error) {
- const uint8_t *der = *der_p;
- if (!der) {
- /* Don't create a new error in this case. */
- return -1;
- }
-
- if (der >= der_end) {
- SecCFDERCreateError(kSecDERErrorUnknownEncoding,
- CFSTR("Unexpected end of datetime"), 0, error);
- *der_p = NULL;
- return -1;
- }
-
- int ch = *der++;
- *der_p = der;
- return ch;
-}
-
-
-static int der_decode_decimal(const uint8_t **der_p, const uint8_t *der_end,
- CFErrorRef *error) {
- char ch = der_get_char(der_p, der_end, error);
- if (ch < '0' || ch > '9') {
- SecCFDERCreateError(kSecDERErrorUnknownEncoding,
- CFSTR("Not a decimal digit"), 0, error);
- *der_p = NULL;
- return -1;
- }
- return ch - '0';
-}
-
-static int der_decode_decimal_pair(const uint8_t **der_p, const uint8_t *der_end,
- CFErrorRef *error) {
- return (10 * der_decode_decimal(der_p, der_end, error))
- + der_decode_decimal(der_p, der_end, error);
-}
-
-static int der_peek_byte(const uint8_t *der, const uint8_t *der_end) {
- if (!der || der >= der_end)
- return -1;
-
- return *der;
-}
-
-static const uint8_t *der_decode_decimal_fraction(double *fraction, CFErrorRef *error,
- const uint8_t* der, const uint8_t *der_end) {
- int ch = der_peek_byte(der, der_end);
- if (ch == -1) {
- der = NULL;
- } else if (ch == '.') {
- uint64_t divisor = 1;
- uint64_t value = 0;
- int last = -1;
- while (++der < der_end) {
- last = ch;
- ch = *der;
- if (ch < '0' || ch > '9') {
- break;
- }
- if (divisor < UINT64_MAX / 10) {
- divisor *= 10;
- value *= 10;
- value += (ch - '0');
- }
- }
- if (der >= der_end)
- der = NULL;
- else if (last == '0') {
- SecCFDERCreateError(kSecDERErrorUnknownEncoding,
- CFSTR("fraction ends in 0"), 0, error);
- der = NULL;
- } else if (last == '.') {
- SecCFDERCreateError(kSecDERErrorUnknownEncoding,
- CFSTR("fraction without digits"), 0, error);
- der = NULL;
- } else {
- *fraction = (double)value / divisor;
- }
- } else {
- *fraction = 0.0;
- }
-
- return der;
-}
-
-static const CFTimeInterval der_decode_timezone_offset(const uint8_t **der_p,
- const uint8_t *der_end,
- CFErrorRef *error) {
- CFTimeInterval timeZoneOffset;
- int ch = der_get_char(der_p, der_end, error);
- if (ch == 'Z') {
- /* Zulu time. */
- timeZoneOffset = 0.0;
- } else {
- /* ZONE INDICATOR */
- int multiplier;
- if (ch == '-')
- multiplier = -60;
- else if (ch == '+')
- multiplier = +60;
- else {
- SecCFDERCreateError(kSecDERErrorUnknownEncoding,
- CFSTR("Invalid datetime character"), 0, error);
- timeZoneOffset = NULL_TIME;
- }
-
- timeZoneOffset = multiplier *
- (der_decode_decimal_pair(der_p, der_end, error)
- * 60 + der_decode_decimal_pair(der_p, der_end, error));
- }
- return timeZoneOffset;
-}
-
-static const uint8_t* der_decode_commontime_body(CFAbsoluteTime *at, CFErrorRef *error, SInt32 year,
- const uint8_t* der, const uint8_t *der_end)
-{
- CFGregorianDate g;
- g.year = year;
- g.month = der_decode_decimal_pair(&der, der_end, error);
- g.day = der_decode_decimal_pair(&der, der_end, error);
- g.hour = der_decode_decimal_pair(&der, der_end, error);
- g.minute = der_decode_decimal_pair(&der, der_end, error);
- g.second = der_decode_decimal_pair(&der, der_end, error);
- double fraction;
- der = der_decode_decimal_fraction(&fraction, error, der, der_end);
-
- CFTimeInterval timeZoneOffset = der_decode_timezone_offset(&der, der_end, error);
-
-#if 0
- secdebug("dateparse",
- "date %.*s year: %04d%02d%02d%02d%02d%02d%+05g",
- length, bytes, g.year, g.month,
- g.day, g.hour, g.minute, g.second,
- timeZoneOffset / 60);
-#endif
-
- if (der) {
- if (der != der_end) {
- SecCFDERCreateError(kSecDERErrorUnknownEncoding,
- CFSTR("trailing garbage at end of datetime"), 0, error);
- return NULL;
- }
-
- *at = SecCFGregorianDateGetAbsoluteTime(g, timeZoneOffset, error) + fraction;
- if (*at == NULL_TIME)
- return NULL;
- }
-
- return der;
-}
-
-const uint8_t* der_decode_generalizedtime_body(CFAbsoluteTime *at, CFErrorRef *error,
- const uint8_t* der, const uint8_t *der_end)
-{
- SInt32 year = 100 * der_decode_decimal_pair(&der, der_end, error) + der_decode_decimal_pair(&der, der_end, error);
- return der_decode_commontime_body(at, error, year, der, der_end);
-}
-
-const uint8_t* der_decode_universaltime_body(CFAbsoluteTime *at, CFErrorRef *error,
- const uint8_t* der, const uint8_t *der_end)
-{
- SInt32 year = der_decode_decimal_pair(&der, der_end, error);
- if (year < 50) {
- /* 0 <= year < 50 : assume century 21 */
- year += 2000;
- } else if (year < 70) {
- /* 50 <= year < 70 : illegal per PKIX */
- SecCFDERCreateError(kSecDERErrorUnknownEncoding,
- CFSTR("Invalid universal time year between 50 and 70"), 0, error);
- der = NULL;
- } else {
- /* 70 < year <= 99 : assume century 20 */
- year += 1900;
- }
-
- return der_decode_commontime_body(at, error, year, der, der_end);
-}
-
-const uint8_t* der_decode_date(CFAllocatorRef allocator, CFOptionFlags mutability,
- CFDateRef* date, CFErrorRef *error,
- const uint8_t* der, const uint8_t *der_end)
-{
- if (NULL == der)
- return NULL;
-
- der = ccder_decode_constructed_tl(CCDER_GENERALIZED_TIME, &der_end, der, der_end);
- CFAbsoluteTime at;
- der = der_decode_generalizedtime_body(&at, error, der, der_end);
- if (der) {
- *date = CFDateCreate(allocator, at);
- if (NULL == *date) {
- SecCFDERCreateError(kSecDERErrorUnderlyingError, CFSTR("Failed to create date"), NULL, error);
- return NULL;
- }
- }
- return der;
-}
-
-extern char *__dtoa(double _d, int mode, int ndigits, int *decpt, int *sign, char **rve);
-extern void __freedtoa(char *);
-
-static size_t ccder_sizeof_nanoseconds(CFAbsoluteTime at) {
- int dotoff;
- int sign;
- char *end;
- char *str = __dtoa(at, 0, 0, &dotoff, &sign, &end);
- ptrdiff_t len = end - str;
- __freedtoa(str);
- return len < dotoff ? 0 : len - dotoff;
- //return len < dotoff ? 0 : len - dotoff > 9 ? 9 : len - dotoff;
-}
-
-size_t der_sizeof_generalizedtime_body(CFAbsoluteTime at, CFErrorRef *error)
-{
- size_t subsec_digits = ccder_sizeof_nanoseconds(at);
-
- /* Generalized zulu time YYYYMMDDhhmmss[.ssss]Z */
- return subsec_digits ? 16 + subsec_digits : 15;
-}
-
-size_t der_sizeof_generalizedtime(CFAbsoluteTime at, CFErrorRef *error)
-{
- return ccder_sizeof(CCDER_GENERALIZED_TIME,
- der_sizeof_generalizedtime_body(at, error));
-}
-
-size_t der_sizeof_date(CFDateRef date, CFErrorRef *error)
-{
- return der_sizeof_generalizedtime(CFDateGetAbsoluteTime(date), error);
-}
-
-
-static uint8_t *ccder_encode_byte(uint8_t byte,
- const uint8_t *der, uint8_t *der_end) {
- if (der + 1 > der_end) {
- return NULL;
- }
- *--der_end = byte;
- return der_end;
-}
-
-static uint8_t *ccder_encode_decimal_pair(int v, const uint8_t *der,
- uint8_t *der_end) {
- if (der + 2 > der_end) {
- return NULL;
- }
- assert(v < 100);
- *--der_end = '0' + v % 10;
- *--der_end = '0' + v / 10;
- return der_end;
-}
-
-static uint8_t *ccder_encode_decimal_quad(int v, const uint8_t *der,
- uint8_t *der_end) {
- return ccder_encode_decimal_pair(v / 100, der,
- ccder_encode_decimal_pair(v % 100, der, der_end));
-}
-
-static uint8_t *ccder_encode_nanoseconds(CFAbsoluteTime at, const uint8_t *der,
- uint8_t *der_end) {
- int dotoff;
- int sign;
- char *end;
- char *str = __dtoa(at, 0, 0, &dotoff, &sign, &end);
- char *begin = str + (dotoff < 0 ? 0 : dotoff);
- // Compute 1.0000000 - fraction in ascii space
- if (at < 0.0 && begin < end) {
- char *p = end - 1;
- // Borrow for last digit
- *p = ('9' + 1) - (*p - '0');
- while (p-- > begin) {
- // Every other digit is a 9 since we borrowed from the last one
- *p = '9' - (*p - '0');
- }
- }
-
- ptrdiff_t len = end - str;
- if (len > dotoff) {
- if (dotoff < 0) {
- assert(-1.0 < at && at < 1.0);
- der_end = ccder_encode_body(len, (const uint8_t *)str, der, der_end);
- der_end = ccder_encode_body_nocopy(-dotoff, der, der_end);
- if (der_end)
- memset(der_end, at < 0.0 ? '9' : '0', -dotoff);
- } else {
- der_end = ccder_encode_body(len - dotoff, (const uint8_t *)(str + dotoff), der, der_end);
- }
- der_end = ccder_encode_byte('.', der, der_end);
- }
- __freedtoa(str);
-
- return der_end;
-}
-
-/* Encode generalized zulu time YYYYMMDDhhmmss[.ssss]Z */
-uint8_t* der_encode_generalizedtime_body(CFAbsoluteTime at, CFErrorRef *error,
- const uint8_t *der, uint8_t *der_end)
-{
- CFGregorianDate g = SecCFAbsoluteTimeGetGregorianDate(floor(at), 0.0, error);
- if (g.year == 0)
- return NULL;
-
- return ccder_encode_decimal_quad(g.year, der,
- ccder_encode_decimal_pair(g.month, der,
- ccder_encode_decimal_pair(g.day, der,
- ccder_encode_decimal_pair(g.hour, der,
- ccder_encode_decimal_pair(g.minute, der,
- ccder_encode_decimal_pair(g.second, der,
- ccder_encode_nanoseconds(at, der,
- ccder_encode_byte('Z', der, der_end))))))));
-}
-
-uint8_t* der_encode_generalizedtime(CFAbsoluteTime at, CFErrorRef *error,
- const uint8_t *der, uint8_t *der_end)
-{
- return ccder_encode_constructed_tl(CCDER_GENERALIZED_TIME, der_end, der,
- der_encode_generalizedtime_body(at, error, der, der_end));
-}
-
-
-uint8_t* der_encode_date(CFDateRef date, CFErrorRef *error,
- const uint8_t *der, uint8_t *der_end)
-{
- return der_encode_generalizedtime(CFDateGetAbsoluteTime(date), error,
- der, der_end);
-}
projects / apple / security.git / blobdiff