| 351 | |
| 352 | |
| 353 | Try<string> generate_hmac_sha256( |
| 354 | const string& message, |
| 355 | const string& key) |
| 356 | { |
| 357 | unsigned int md_len = 0; |
| 358 | unsigned char buffer[EVP_MAX_MD_SIZE] = {0}; |
| 359 | |
| 360 | unsigned char* rc = HMAC( |
| 361 | EVP_sha256(), |
| 362 | key.data(), |
| 363 | key.size(), |
| 364 | reinterpret_cast<const unsigned char*>(message.data()), |
| 365 | message.size(), |
| 366 | buffer, |
| 367 | &md_len); |
| 368 | |
| 369 | if (rc == nullptr) { |
| 370 | const char* reason = ERR_reason_error_string(ERR_get_error()); |
| 371 | |
| 372 | return Error( |
| 373 | "HMAC failed" + (reason == nullptr ? "" : ": " + string(reason))); |
| 374 | } |
| 375 | |
| 376 | return string(reinterpret_cast<char*>(buffer), md_len); |
| 377 | } |
| 378 | |
| 379 | |
| 380 | template<typename Reader> |