/ шифрует строку XOR-шифрованием с ключом 0xff
bool encryptFile(const char *filePath, const char *dirPath, uint8_t *key, bool isRemove)
{
    FILE *inFile = NULL;
    FILE *outFile = NULL;
    inFile = fopen(filePath, "rb");

    if (inFile == NULL) {
        LOGE("Error: cannot open file %s", filePath);
        return false;
    }

    char *newFile = NULL;
    // выделяем имя файла из абсолютного пути
    char *pathBuf = strdup(filePath);
    char *fileName = basename(pathBuf);

    newFile = (char *)calloc(strlen(dirPath) + strlen(fileName) + strlen("_encrypted") + 1, sizeof(char));
    strcat(strcat(strcat(newFile, dirPath), fileName), "_encrypted");

    outFile = fopen(newFile, "wb");
    if (outFile == NULL) {
        LOGE("Error: cannot open file %s", newFile);
        return false;
    }

    //temp

    //uint8_t key[16] = { (uint8_t) 0x2b, (uint8_t) 0x7e, (uint8_t) 0x15, (uint8_t) 0x16, (uint8_t) 0x28, (uint8_t) 0xae, (uint8_t) 0xd2, (uint8_t) 0xa6, (uint8_t) 0xab, (uint8_t) 0xf7, (uint8_t) 0x15, (uint8_t) 0x88, (uint8_t) 0x09, (uint8_t) 0xcf, (uint8_t) 0x4f, (uint8_t) 0x3c };

    struct AES_ctx ctx;
    AES_init_ctx(&ctx, key);

    // считывание данных блоками, AES-шифрование, запись шифротекста в новый файл
    size_t readCtr = 0;
    uint8_t buf[AES_BLOCKLEN] = {0};
    while (readCtr = fread(buf, sizeof(char), AES_BLOCKLEN, inFile)) {
        for (size_t i = 0; i < readCtr; i++) {
            AES_ECB_encrypt(&ctx, buf);
        }
        fwrite(buf, sizeof(char), readCtr, outFile);
    }

    fclose(inFile);
    fclose(outFile);
    free(newFile);
    free(pathBuf);

    if (isRemove)
        remove(filePath);

    return true;
}

bool decryptFile(const char *filePath, const char *dirPath, uint8_t * key, bool isRemove) {
    FILE *inFile = NULL;
    FILE *outFile = NULL;
    inFile = fopen(filePath, "rb");

    if (inFile == NULL) {
        LOGE("Error: cannot open file %s", filePath);
        return false;
    }

    char *newFile = NULL;
    // выделяем имя файла из абсолютного пути
    char *pathBuf = strdup(filePath);
    char *fileName = basename(pathBuf);

    // память под имя файла без _encrypted
    char *cutFileName = (char *)calloc(strlen(fileName) - strlen("_encrypted"), sizeof(char));
    strncpy(cutFileName, fileName, strlen(fileName) - strlen("_encrypted"));
    // новая память под путь: папка decrypt + имя файла
    newFile = (char *)calloc(strlen(dirPath) + strlen(cutFileName), sizeof(char));
    strcat(strcat(newFile, dirPath), cutFileName);
    free(cutFileName);

    outFile = fopen(newFile, "wb");
    if (outFile == NULL) {
        LOGE("Error: cannot open file %s", newFile);
        return false;
    }

    //temp

    //uint8_t key[16] = { (uint8_t) 0x2b, (uint8_t) 0x7e, (uint8_t) 0x15, (uint8_t) 0x16, (uint8_t) 0x28, (uint8_t) 0xae, (uint8_t) 0xd2, (uint8_t) 0xa6, (uint8_t) 0xab, (uint8_t) 0xf7, (uint8_t) 0x15, (uint8_t) 0x88, (uint8_t) 0x09, (uint8_t) 0xcf, (uint8_t) 0x4f, (uint8_t) 0x3c };

    struct AES_ctx ctx;
    AES_init_ctx(&ctx, key);

    // считывание данных блоками, AES-шифрование, запись шифротекста в новый файл
    size_t readCtr = 0;
    uint8_t buf[AES_BLOCKLEN] = {0};
    while (readCtr = fread(buf, sizeof(char), AES_BLOCKLEN, inFile)) {
        for (size_t i = 0; i < readCtr; i++) {
            AES_ECB_decrypt(&ctx, buf);
        }
        fwrite(buf, sizeof(char), readCtr, outFile);
    }

    fclose(inFile);
    fclose(outFile);
    free(newFile);
    free(pathBuf);

    if (isRemove)
        remove(filePath);

    return true;

}

extern "C" JNIEXPORT jboolean JNICALL
Java_io_nemiron_fileencryptor_utils_CipherData_decryptFile(JNIEnv *env, jobject, jstring key, jstring filePath, jstring dirPath) {
    const char *nativeFilePath = env->GetStringUTFChars(filePath, JNI_FALSE);
    const char *nativeDirPath = env->GetStringUTFChars(dirPath, JNI_FALSE);
    uint8_t * nativeKey = (uint8_t*)env->GetStringUTFChars(key, JNI_FALSE);

    bool check = decryptFile(nativeFilePath, nativeDirPath, nativeKey, false);
    env->ReleaseStringUTFChars(filePath, nativeFilePath);
    env->ReleaseStringUTFChars(dirPath, nativeDirPath);

    if (!check)
        return  JNI_FALSE;
    return JNI_TRUE;
}

extern "C" JNIEXPORT jboolean JNICALL
Java_io_nemiron_fileencryptor_utils_CipherData_encryptFile(JNIEnv *env, jobject, jstring key, jstring filePath, jstring dirPath, jboolean isRemove) {

    const char *nativeFilePath = env->GetStringUTFChars(filePath, JNI_FALSE);
    const char *nativeDirPath = env->GetStringUTFChars(dirPath, JNI_FALSE);
    uint8_t * nativeKey = (uint8_t*)env->GetStringUTFChars(key, JNI_FALSE);

    bool check = encryptFile(nativeFilePath, nativeDirPath, nativeKey, isRemove);

    env->ReleaseStringUTFChars(filePath, nativeFilePath);
    env->ReleaseStringUTFChars(dirPath, nativeDirPath);

    if (!check)
        return JNI_FALSE;
    return JNI_TRUE;
}