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/*
* Copyright (c) 2019-2021 David Timber <mieabby@gmail.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "dvault.h"
#include "util_rt.h"
#include "util_ct.h"
#include "endian.h"
#include <string.h>
#include <errno.h>
static uint8_t *m_data;
static const uint8_t *m_mask;
static uint16_t *m_offsets;
static uint8_t *m_unmasked;
static size_t m_unmasked_size;
static uint8_t m_salt;
static void invert_entry (
const prne_data_key_t key,
prne_data_type_t *type,
const uint8_t **data_start,
size_t *len)
{
size_t entry_len;
m_salt = m_data[m_offsets[key]];
m_unmasked = m_data + m_offsets[key] + 1;
prne_dvault_invert_mem(3, m_unmasked, m_salt, 0, m_mask);
*type = (prne_data_type_t)m_unmasked[0];
entry_len = ((size_t)m_unmasked[1] << 8) | ((size_t)m_unmasked[2] << 0);
m_unmasked_size = 3 + entry_len;
*data_start = m_unmasked + 3;
prne_dvault_invert_mem(entry_len, m_unmasked + 3, m_salt, 3, m_mask);
if (len != NULL) {
*len = entry_len;
}
}
const char *prne_data_type_tostr (const prne_data_type_t t) {
switch (t) {
case PRNE_DATA_TYPE_CSTR: return "cstr";
case PRNE_DATA_TYPE_BIN: return "bin";
}
errno = EINVAL;
return NULL;
}
prne_data_type_t prne_data_type_fstr (const char *str) {
if (prne_nstreq(str, prne_data_type_tostr(PRNE_DATA_TYPE_CSTR))) {
return PRNE_DATA_TYPE_CSTR;
}
if (prne_nstreq(str, prne_data_type_tostr(PRNE_DATA_TYPE_BIN))) {
return PRNE_DATA_TYPE_BIN;
}
errno = EINVAL;
return PRNE_DATA_TYPE_NONE;
}
void prne_dvault_invert_mem (
const size_t size,
void *m,
const uint8_t salt,
const size_t salt_ofs,
const uint8_t *mask)
{
size_t i;
for (i = 0; i < size; i += 1) {
((uint8_t*)m)[i] ^= mask[(i + salt_ofs + (size_t)salt) % 256];
}
}
void prne_init_dvault_mask_result (prne_dvault_mask_result_t *r) {
r->result = PRNE_DVAULT_MASK_OK;
r->data = NULL;
r->size = 0;
}
void prne_free_dvault_mask_result (prne_dvault_mask_result_t *r) {
prne_free(r->data);
r->size = 0;
r->data = NULL;
r->result = PRNE_DVAULT_MASK_OK;
}
prne_dvault_mask_result_t prne_dvault_mask (
const prne_data_type_t type,
const uint8_t salt,
const uint8_t *mask,
const size_t data_size,
const uint8_t *data)
{
prne_dvault_mask_result_t ret;
prne_init_dvault_mask_result(&ret);
if (data_size > 0xFFFF - 4) {
ret.result = PRNE_DVAULT_MASK_TOO_LARGE;
return ret;
}
ret.size = data_size + 4;
ret.data = prne_malloc(1, ret.size);
if (ret.data == NULL) {
ret.result = PRNE_DVAULT_MASK_MEM_ERR;
ret.size = 0;
return ret;
}
ret.data[0] = salt;
ret.data[1] = (uint8_t)type;
ret.data[2] = (uint8_t)((0xFF00 & (uint_fast16_t)data_size) >> 8);
ret.data[3] = (uint8_t)((0x00FF & (uint_fast16_t)data_size) >> 0);
memcpy(ret.data + 4, data, data_size);
prne_dvault_invert_mem(ret.size - 1, ret.data + 1, salt, 0, mask);
return ret;
}
const char *prne_dvault_mask_result_tostr (
const prne_dvault_mask_result_code_t code)
{
switch (code) {
case PRNE_DVAULT_MASK_OK: return "ok";
case PRNE_DVAULT_MASK_MEM_ERR: return "memory error";
case PRNE_DVAULT_MASK_TOO_LARGE: return "data too large";
case PRNE_DVAULT_MASK_INVALID_TYPE: return "invalid type";
}
errno = EINVAL;
return NULL;
}
void prne_init_dvault (const void *m) {
prne_dbgast(
m_mask == NULL &&
m_offsets == NULL &&
m_data == NULL &&
m_unmasked == NULL);
m_data = (uint8_t*)m;
m_mask = (uint8_t*)m + 0;
m_offsets = (uint16_t*)((uint8_t*)m + 256);
prne_dvault_invert_mem(NB_PRNE_DATA_KEY * 2, m_offsets, 0, 0, m_mask);
for (prne_data_key_t i = 0; i < NB_PRNE_DATA_KEY; i += 1) {
m_offsets[i] = prne_be16toh(m_offsets[i]);
}
}
void prne_deinit_dvault (void) {
prne_dbgast(m_mask != NULL && m_offsets != NULL && m_data != NULL);
prne_dvault_reset();
for (prne_data_key_t i = 0; i < NB_PRNE_DATA_KEY; i += 1) {
m_offsets[i] = prne_be16toh(m_offsets[i]);
}
prne_dvault_invert_mem(NB_PRNE_DATA_KEY * 2, m_offsets, 0, 0, m_mask);
m_mask = NULL;
m_offsets = NULL;
m_data = NULL;
}
static const uint8_t *dvault_get_bin (
const prne_data_key_t key,
const prne_data_type_t desired,
size_t *len)
{
const uint8_t *data_start;
prne_data_type_t type;
prne_dvault_reset();
invert_entry(key, &type, &data_start, len);
prne_dbgast(type == desired);
return data_start;
}
const char *prne_dvault_get_cstr (const prne_data_key_t key, size_t *len) {
const char *ret = (const char*)dvault_get_bin(
key,
PRNE_DATA_TYPE_CSTR,
len);
if (len != NULL) {
*len -= 1;
}
return ret;
}
const uint8_t *prne_dvault_get_bin (const prne_data_key_t key, size_t *len) {
return dvault_get_bin(key, PRNE_DATA_TYPE_BIN, len);
}
void prne_dvault_reset (void) {
if (m_unmasked != NULL) {
prne_dvault_invert_mem(m_unmasked_size, m_unmasked, m_salt, 0, m_mask);
m_unmasked = NULL;
m_unmasked_size = 0;
}
}
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