Acore::Crypto::TOTP Struct Reference

#include "TOTP.h"

Public Types
using	Secret = std::vector< uint8 >

Static Public Member Functions
static uint32	GenerateToken (Secret const &key, time_t timestamp)
static bool	ValidateToken (Secret const &key, uint32 token)

Static Public Attributes
static constexpr std::size_t	RECOMMENDED_SECRET_LENGTH = 20

Detailed Description

Member Typedef Documentation

Secret

using Acore::Crypto::TOTP::Secret = std::vector<uint8>

Member Function Documentation

GenerateToken()

uint32 Acore::Crypto::TOTP::GenerateToken ( Secret const &  key, time_t  timestamp  )

static

{
    timestamp /= TOTP_INTERVAL;
    unsigned char challenge[8];
    for (int i = 8; i--; timestamp >>= 8)
        challenge[i] = timestamp;
 
    unsigned char digest[HMAC_RESULT_SIZE];
    uint32 digestSize = HMAC_RESULT_SIZE;
    HMAC(EVP_sha1(), secret.data(), secret.size(), challenge, 8, digest, &digestSize);
 
    uint32 offset = digest[19] & 0xF;
    uint32 truncated = (digest[offset] << 24) | (digest[offset + 1] << 16) | (digest[offset + 2] << 8) | (digest[offset + 3]);
    truncated &= 0x7FFFFFFF;
    return (truncated % 1000000);
}

References HMAC_RESULT_SIZE, and TOTP_INTERVAL.

ValidateToken()

bool Acore::Crypto::TOTP::ValidateToken ( Secret const &  key, uint32  token  )

static

{
    time_t now = GetEpochTime().count();
    return (
        (token == GenerateToken(secret, now - TOTP_INTERVAL)) ||
        (token == GenerateToken(secret, now)) ||
        (token == GenerateToken(secret, now + TOTP_INTERVAL))
    );
}

References GetEpochTime(), and TOTP_INTERVAL.

Referenced by account_commandscript::HandleAccount2FARemoveCommand(), account_commandscript::HandleAccount2FASetupCommand(), and AuthSession::HandleLogonProof().

Member Data Documentation

RECOMMENDED_SECRET_LENGTH

constexpr std::size_t Acore::Crypto::TOTP::RECOMMENDED_SECRET_LENGTH = 20

staticconstexpr

Referenced by account_commandscript::HandleAccount2FASetupCommand().