42 size_t key_len)
const {
43 argon2(output, output_len, password, password_len, salt, salt_len, key, key_len, ad, ad_len);
78 std::chrono::milliseconds msec,
80 std::chrono::milliseconds tune_time)
const {
81 const size_t max_kib = (max_memory == 0) ? 256 * 1024 : max_memory * 1024;
85 const size_t tune_M = (msec >= std::chrono::milliseconds(200) ? 128 : 36) * 1024;
93 auto tune_fn = [&]() {
94 uint8_t output[64] = {0};
95 pwhash->derive_key(output,
sizeof(output),
"test", 4,
nullptr, 0);
98 const uint64_t measured_time =
measure_cost(tune_time, tune_fn) / (tune_M / M);
100 const uint64_t target_nsec = msec.count() *
static_cast<uint64_t
>(1000000);
110 uint64_t est_nsec = measured_time;
112 if(est_nsec < target_nsec && M < max_kib) {
113 const uint64_t desired_cost_increase = (target_nsec + est_nsec - 1) / est_nsec;
114 const uint64_t mem_headroom = max_kib / M;
116 const uint64_t M_mult = std::min(desired_cost_increase, mem_headroom);
117 M *=
static_cast<size_t>(M_mult);
121 if(est_nsec < target_nsec / 2) {
122 const uint64_t desired_cost_increase = (target_nsec + est_nsec - 1) / est_nsec;
123 t *=
static_cast<size_t>(desired_cost_increase);
void derive_key(uint8_t out[], size_t out_len, const char *password, size_t password_len, const uint8_t salt[], size_t salt_len) const override