void CryptoAlgorithmRSA_OAEP::importKey()

in src/bun.js/bindings/webcrypto/CryptoAlgorithmRSA_OAEP.cpp [105:193]
80 lines of code
39 McCabe index (conditional complexity)

void CryptoAlgorithmRSA_OAEP::importKey(CryptoKeyFormat format, KeyData&& data, const CryptoAlgorithmParameters& parameters, bool extractable, CryptoKeyUsageBitmap usages, KeyCallback&& callback, ExceptionCallback&& exceptionCallback)
{
    using namespace CryptoAlgorithmRSA_OAEPInternal;

    const auto& rsaParameters = downcast<CryptoAlgorithmRsaHashedImportParams>(parameters);

    RefPtr<CryptoKeyRSA> result;
    switch (format) {
    case CryptoKeyFormat::Jwk: {
        JsonWebKey key = WTFMove(std::get<JsonWebKey>(data));

        bool isUsagesAllowed = false;
        if (!key.d.isNull()) {
            isUsagesAllowed = isUsagesAllowed || !(usages ^ CryptoKeyUsageDecrypt);
            isUsagesAllowed = isUsagesAllowed || !(usages ^ CryptoKeyUsageUnwrapKey);
            isUsagesAllowed = isUsagesAllowed || !(usages ^ (CryptoKeyUsageDecrypt | CryptoKeyUsageUnwrapKey));
        } else {
            isUsagesAllowed = isUsagesAllowed || !(usages ^ CryptoKeyUsageEncrypt);
            isUsagesAllowed = isUsagesAllowed || !(usages ^ CryptoKeyUsageWrapKey);
            isUsagesAllowed = isUsagesAllowed || !(usages ^ (CryptoKeyUsageEncrypt | CryptoKeyUsageWrapKey));
        }
        isUsagesAllowed = isUsagesAllowed || !usages;
        if (!isUsagesAllowed) {
            exceptionCallback(SyntaxError);
            return;
        }

        if (usages && !key.use.isNull() && key.use != "enc"_s) {
            exceptionCallback(DataError);
            return;
        }

        bool isMatched = false;
        switch (rsaParameters.hashIdentifier) {
        case CryptoAlgorithmIdentifier::SHA_1:
            isMatched = key.alg.isNull() || key.alg == ALG1;
            break;
        case CryptoAlgorithmIdentifier::SHA_224:
            isMatched = key.alg.isNull() || key.alg == ALG224;
            break;
        case CryptoAlgorithmIdentifier::SHA_256:
            isMatched = key.alg.isNull() || key.alg == ALG256;
            break;
        case CryptoAlgorithmIdentifier::SHA_384:
            isMatched = key.alg.isNull() || key.alg == ALG384;
            break;
        case CryptoAlgorithmIdentifier::SHA_512:
            isMatched = key.alg.isNull() || key.alg == ALG512;
            break;
        default:
            break;
        }
        if (!isMatched) {
            exceptionCallback(DataError);
            return;
        }

        result = CryptoKeyRSA::importJwk(rsaParameters.identifier, rsaParameters.hashIdentifier, WTFMove(key), extractable, usages);
        break;
    }
    case CryptoKeyFormat::Spki: {
        if (usages && (usages ^ CryptoKeyUsageEncrypt) && (usages ^ CryptoKeyUsageWrapKey) && (usages ^ (CryptoKeyUsageEncrypt | CryptoKeyUsageWrapKey))) {
            exceptionCallback(SyntaxError);
            return;
        }
        // FIXME: <webkit.org/b/165436>
        result = CryptoKeyRSA::importSpki(rsaParameters.identifier, rsaParameters.hashIdentifier, WTFMove(std::get<Vector<uint8_t>>(data)), extractable, usages);
        break;
    }
    case CryptoKeyFormat::Pkcs8: {
        if (usages && (usages ^ CryptoKeyUsageDecrypt) && (usages ^ CryptoKeyUsageUnwrapKey) && (usages ^ (CryptoKeyUsageDecrypt | CryptoKeyUsageUnwrapKey))) {
            exceptionCallback(SyntaxError);
            return;
        }
        // FIXME: <webkit.org/b/165436>
        result = CryptoKeyRSA::importPkcs8(parameters.identifier, rsaParameters.hashIdentifier, WTFMove(std::get<Vector<uint8_t>>(data)), extractable, usages);
        break;
    }
    default:
        exceptionCallback(NotSupportedError);
        return;
    }
    if (!result) {
        exceptionCallback(DataError);
        return;
    }

    callback(*result);
}