TokenInterface interface = generateToken(store);
->
TokenManager::TokenInterface TokenManager::generateToken(const sp<IBase> &interface) {
uint64_t id = ++mTokenIndex;
std::array<uint8_t, EVP_MAX_MD_SIZE> hmac;
uint32_t hmacSize;
uint8_t *hmacOut = HMAC(EVP_sha256(),
mKey.data(), mKey.size(),
(uint8_t*) &id, sizeof(id),
hmac.data(), &hmacSize);
if (hmacOut == nullptr ||
hmacOut != hmac.data()) {
ALOGE("Generating token failed, got %p.", hmacOut);
return { nullptr, TOKEN_ID_NONE, {} };
}
// only care about the first HMAC_SIZE bytes of the HMAC
const hidl_vec<uint8_t> &token = makeToken(id, hmac.data(), hmacSize);
return { interface, id, token };
}
其中
struct TokenInterface {
sp<IBase> interface;
uint64_t id;
hidl_vec<uint8_t> token; // First eight bytes are tokenId. Remaining bytes are hmac.
};
接着
uint64_t id = getTokenId(interface.token);
...
mMap[id] = interface;
