/arduino8772.cpp Secret
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December 22, 2022 11:52
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#include <Arduino.h> | |
#include <ESP8266WiFi.h> | |
#include <array> | |
namespace { | |
struct KeygenResult { | |
using Buffer = std::array<uint8_t, BR_EC_KBUF_PRIV_MAX_SIZE>; | |
alignas(4) Buffer buf; | |
br_ec_private_key key; | |
bool ok { false }; | |
}; | |
auto keygen_ec(int curve) { | |
KeygenResult out; | |
auto seeder = br_prng_seeder_system(nullptr); | |
if (seeder == nullptr) { | |
return out; | |
} | |
br_hmac_drbg_context rng; | |
br_hmac_drbg_init(&rng, &br_sha256_vtable, nullptr, 0); | |
if (!seeder(&rng.vtable)) { | |
return out; | |
} | |
const auto* impl = br_ec_get_default(); | |
out.ok = 0 != br_ec_keygen( | |
&rng.vtable, impl, | |
&out.key, out.buf.data(), curve); | |
return out; | |
} | |
} // namespace | |
void setup() { | |
Serial.begin(115200); | |
Serial.setDebugOutput(true); | |
delay(1000); | |
const auto result = keygen_ec(BR_EC_secp256r1); | |
if (result.ok) { | |
hexdump(result.key.x, result.key.xlen); | |
} else { | |
puts("-ERROR!"); | |
} | |
} | |
void loop() { | |
} |
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