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/*
* EAC Time Types
* (C) 2007 FlexSecure GmbH
* 2008-2009 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/eac_asn_obj.h>
#include <botan/der_enc.h>
#include <botan/ber_dec.h>
#include <botan/charset.h>
#include <botan/parsing.h>
#include <botan/internal/rounding.h>
#include <botan/calendar.h>
namespace Botan {
namespace {
secure_vector<byte> enc_two_digit(u32bit in)
{
secure_vector<byte> result;
in %= 100;
if(in < 10)
result.push_back(0x00);
else
{
u32bit y_first_pos = round_down<u32bit>(in, 10) / 10;
result.push_back(static_cast<byte>(y_first_pos));
}
u32bit y_sec_pos = in % 10;
result.push_back(static_cast<byte>(y_sec_pos));
return result;
}
u32bit dec_two_digit(byte b1, byte b2)
{
u32bit upper = b1;
u32bit lower = b2;
if(upper > 9 || lower > 9)
throw Invalid_Argument("CVC dec_two_digit value too large");
return upper*10 + lower;
}
}
/*
* Create an EAC_Time
*/
EAC_Time::EAC_Time(const std::chrono::system_clock::time_point& time,
ASN1_Tag t) : tag(t)
{
calendar_point cal = calendar_value(time);
year = cal.year;
month = cal.month;
day = cal.day;
}
/*
* Create an EAC_Time
*/
EAC_Time::EAC_Time(const std::string& t_spec, ASN1_Tag t) : tag(t)
{
set_to(t_spec);
}
/*
* Create an EAC_Time
*/
EAC_Time::EAC_Time(u32bit y, u32bit m, u32bit d, ASN1_Tag t) :
year(y), month(m), day(d), tag(t)
{
}
/*
* Set the time with a human readable string
*/
void EAC_Time::set_to(const std::string& time_str)
{
if(time_str == "")
{
year = month = day = 0;
return;
}
std::vector<std::string> params;
std::string current;
for(u32bit j = 0; j != time_str.size(); ++j)
{
if(Charset::is_digit(time_str[j]))
current += time_str[j];
else
{
if(current != "")
params.push_back(current);
current.clear();
}
}
if(current != "")
params.push_back(current);
if(params.size() != 3)
throw Invalid_Argument("Invalid time specification " + time_str);
year = to_u32bit(params[0]);
month = to_u32bit(params[1]);
day = to_u32bit(params[2]);
if(!passes_sanity_check())
throw Invalid_Argument("Invalid time specification " + time_str);
}
/*
* DER encode a EAC_Time
*/
void EAC_Time::encode_into(DER_Encoder& der) const
{
der.add_object(tag, APPLICATION,
encoded_eac_time());
}
/*
* Return a string representation of the time
*/
std::string EAC_Time::as_string() const
{
if(time_is_set() == false)
throw Invalid_State("EAC_Time::as_string: No time set");
return std::to_string(year * 10000 + month * 100 + day);
}
/*
* Return if the time has been set somehow
*/
bool EAC_Time::time_is_set() const
{
return (year != 0);
}
/*
* Return a human readable string representation
*/
std::string EAC_Time::readable_string() const
{
if(time_is_set() == false)
throw Invalid_State("EAC_Time::readable_string: No time set");
std::string output(11, 0);
std::sprintf(&output[0], "%04d/%02d/%02d", year, month, day);
return output;
}
/*
* Do a general sanity check on the time
*/
bool EAC_Time::passes_sanity_check() const
{
if(year < 2000 || year > 2099)
return false;
if(month == 0 || month > 12)
return false;
if(day == 0 || day > 31)
return false;
return true;
}
/*
* modification functions
*/
void EAC_Time::add_years(u32bit years)
{
year += years;
}
void EAC_Time::add_months(u32bit months)
{
year += months/12;
month += months % 12;
if(month > 12)
{
year += 1;
month -= 12;
}
}
/*
* Compare this time against another
*/
s32bit EAC_Time::cmp(const EAC_Time& other) const
{
if(time_is_set() == false)
throw Invalid_State("EAC_Time::cmp: No time set");
const s32bit EARLIER = -1, LATER = 1, SAME_TIME = 0;
if(year < other.year) return EARLIER;
if(year > other.year) return LATER;
if(month < other.month) return EARLIER;
if(month > other.month) return LATER;
if(day < other.day) return EARLIER;
if(day > other.day) return LATER;
return SAME_TIME;
}
/*
* Compare two EAC_Times for in various ways
*/
bool operator==(const EAC_Time& t1, const EAC_Time& t2)
{
return (t1.cmp(t2) == 0);
}
bool operator!=(const EAC_Time& t1, const EAC_Time& t2)
{
return (t1.cmp(t2) != 0);
}
bool operator<=(const EAC_Time& t1, const EAC_Time& t2)
{
return (t1.cmp(t2) <= 0);
}
bool operator>=(const EAC_Time& t1, const EAC_Time& t2)
{
return (t1.cmp(t2) >= 0);
}
bool operator>(const EAC_Time& t1, const EAC_Time& t2)
{
return (t1.cmp(t2) > 0);
}
bool operator<(const EAC_Time& t1, const EAC_Time& t2)
{
return (t1.cmp(t2) < 0);
}
/*
* Decode a BER encoded EAC_Time
*/
void EAC_Time::decode_from(BER_Decoder& source)
{
BER_Object obj = source.get_next_object();
if(obj.type_tag != this->tag)
throw BER_Decoding_Error("Tag mismatch when decoding");
if(obj.value.size() != 6)
{
throw Decoding_Error("EAC_Time decoding failed");
}
try
{
u32bit tmp_year = dec_two_digit(obj.value[0], obj.value[1]);
u32bit tmp_mon = dec_two_digit(obj.value[2], obj.value[3]);
u32bit tmp_day = dec_two_digit(obj.value[4], obj.value[5]);
year = tmp_year + 2000;
month = tmp_mon;
day = tmp_day;
}
catch (Invalid_Argument)
{
throw Decoding_Error("EAC_Time decoding failed");
}
}
/*
* make the value an octet string for encoding
*/
secure_vector<byte> EAC_Time::encoded_eac_time() const
{
secure_vector<byte> result;
result += enc_two_digit(year);
result += enc_two_digit(month);
result += enc_two_digit(day);
return result;
}
}
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