9#include <botan/internal/calendar.h>
14 std::string_view hash_algo,
15 size_t digits,
size_t time_step)
16 : m_hotp(key, key_len, hash_algo, digits)
17 , m_time_step(time_step)
18 , m_unix_epoch(
calendar_point(1970, 1, 1, 0, 0, 0).to_std_timepoint())
24 BOTAN_ARG_CHECK(m_time_step > 0 && m_time_step < 300,
"Invalid TOTP time step");
29 const uint64_t unix_time =
30 std::chrono::duration_cast<std::chrono::seconds>(current_time - m_unix_epoch).count();
40 size_t clock_drift_accepted)
42 const uint64_t unix_time =
43 std::chrono::duration_cast<std::chrono::seconds>(current_time - m_unix_epoch).count();
44 return verify_totp(otp, unix_time, clock_drift_accepted);
48 size_t clock_drift_accepted)
50 uint64_t t = unix_time / m_time_step;
52 for(
size_t i = 0; i <= clock_drift_accepted; ++i)
#define BOTAN_ARG_CHECK(expr, msg)
uint32_t generate_hotp(uint64_t counter)
uint32_t generate_totp(std::chrono::system_clock::time_point time_point)
TOTP(const SymmetricKey &key, std::string_view hash_algo="SHA-1", size_t digits=6, size_t time_step=30)
bool verify_totp(uint32_t otp, std::chrono::system_clock::time_point time, size_t clock_drift_accepted=0)