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/*
* (C) 2017 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_TOTP_H_
#define BOTAN_TOTP_H_
#include <botan/hotp.h>
#include <chrono>
namespace Botan {
/**
* TOTP (time based) one time passwords (RFC 6238)
*/
class BOTAN_PUBLIC_API(2,2) TOTP final
{
public:
/**
* @param key the secret key shared between client and server
* @param hash_algo the hash algorithm to use, should be SHA-1, SHA-256 or SHA-512
* @param digits the number of digits in the OTP (must be 6, 7, or 8)
* @param time_step granularity of OTP in seconds
*/
TOTP(const SymmetricKey& key, const std::string& hash_algo = "SHA-1",
size_t digits = 6, size_t time_step = 30);
/**
* Convert the provided time_point to a Unix timestamp and call generate_totp
*/
uint32_t generate_totp(std::chrono::system_clock::time_point time_point);
/**
* Generate the OTP cooresponding the the provided "Unix timestamp" (ie
* number of seconds since midnight Jan 1, 1970)
*/
uint32_t generate_totp(uint64_t unix_time);
bool verify_totp(uint32_t otp,
std::chrono::system_clock::time_point time,
size_t clock_drift_accepted = 0);
bool verify_totp(uint32_t otp, uint64_t unix_time,
size_t clock_drift_accepted = 0);
private:
HOTP m_hotp;
size_t m_time_step;
std::chrono::system_clock::time_point m_unix_epoch;
};
}
#endif
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