341 lines
11 KiB
C
Executable file
341 lines
11 KiB
C
Executable file
/**
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "encryption_info.h"
|
|
#include "mem.h"
|
|
#include "intreadwrite.h"
|
|
|
|
#define FF_ENCRYPTION_INFO_EXTRA 24
|
|
|
|
// The format of the AVEncryptionInfo side data:
|
|
// u32be scheme
|
|
// u32be crypt_byte_block
|
|
// u32be skip_byte_block
|
|
// u32be key_id_size
|
|
// u32be iv_size
|
|
// u32be subsample_count
|
|
// u8[key_id_size] key_id
|
|
// u8[iv_size] iv
|
|
// {
|
|
// u32be bytes_of_clear_data
|
|
// u32be bytes_of_protected_data
|
|
// }[subsample_count]
|
|
|
|
AVEncryptionInfo *av_encryption_info_alloc(uint32_t subsample_count, uint32_t key_id_size, uint32_t iv_size)
|
|
{
|
|
AVEncryptionInfo *info;
|
|
|
|
info = av_mallocz(sizeof(*info));
|
|
if (!info)
|
|
return NULL;
|
|
|
|
info->key_id = av_mallocz(key_id_size);
|
|
info->key_id_size = key_id_size;
|
|
info->iv = av_mallocz(iv_size);
|
|
info->iv_size = iv_size;
|
|
info->subsamples = av_mallocz_array(subsample_count, sizeof(*info->subsamples));
|
|
info->subsample_count = subsample_count;
|
|
|
|
// Allow info->subsamples to be NULL if there are no subsamples.
|
|
if (!info->key_id || !info->iv || (!info->subsamples && subsample_count)) {
|
|
av_encryption_info_free(info);
|
|
return NULL;
|
|
}
|
|
|
|
return info;
|
|
}
|
|
|
|
AVEncryptionInfo *av_encryption_info_clone(const AVEncryptionInfo *info)
|
|
{
|
|
AVEncryptionInfo *ret;
|
|
|
|
ret = av_encryption_info_alloc(info->subsample_count, info->key_id_size, info->iv_size);
|
|
if (!ret)
|
|
return NULL;
|
|
|
|
ret->scheme = info->scheme;
|
|
ret->crypt_byte_block = info->crypt_byte_block;
|
|
ret->skip_byte_block = info->skip_byte_block;
|
|
memcpy(ret->iv, info->iv, info->iv_size);
|
|
memcpy(ret->key_id, info->key_id, info->key_id_size);
|
|
memcpy(ret->subsamples, info->subsamples, sizeof(*info->subsamples) * info->subsample_count);
|
|
return ret;
|
|
}
|
|
|
|
void av_encryption_info_free(AVEncryptionInfo *info)
|
|
{
|
|
if (info) {
|
|
av_free(info->key_id);
|
|
av_free(info->iv);
|
|
av_free(info->subsamples);
|
|
av_free(info);
|
|
}
|
|
}
|
|
|
|
AVEncryptionInfo *av_encryption_info_get_side_data(const uint8_t* buffer, size_t size)
|
|
{
|
|
AVEncryptionInfo *info;
|
|
uint64_t key_id_size, iv_size, subsample_count, i;
|
|
|
|
if (!buffer || size < FF_ENCRYPTION_INFO_EXTRA)
|
|
return NULL;
|
|
|
|
key_id_size = AV_RB32(buffer + 12);
|
|
iv_size = AV_RB32(buffer + 16);
|
|
subsample_count = AV_RB32(buffer + 20);
|
|
|
|
if (size < FF_ENCRYPTION_INFO_EXTRA + key_id_size + iv_size + subsample_count * 8)
|
|
return NULL;
|
|
|
|
info = av_encryption_info_alloc(subsample_count, key_id_size, iv_size);
|
|
if (!info)
|
|
return NULL;
|
|
|
|
info->scheme = AV_RB32(buffer);
|
|
info->crypt_byte_block = AV_RB32(buffer + 4);
|
|
info->skip_byte_block = AV_RB32(buffer + 8);
|
|
memcpy(info->key_id, buffer + 24, key_id_size);
|
|
memcpy(info->iv, buffer + key_id_size + 24, iv_size);
|
|
|
|
buffer += key_id_size + iv_size + 24;
|
|
for (i = 0; i < subsample_count; i++) {
|
|
info->subsamples[i].bytes_of_clear_data = AV_RB32(buffer);
|
|
info->subsamples[i].bytes_of_protected_data = AV_RB32(buffer + 4);
|
|
buffer += 8;
|
|
}
|
|
|
|
return info;
|
|
}
|
|
|
|
uint8_t *av_encryption_info_add_side_data(const AVEncryptionInfo *info, size_t *size)
|
|
{
|
|
uint8_t *buffer, *cur_buffer;
|
|
uint32_t i;
|
|
|
|
if (UINT32_MAX - FF_ENCRYPTION_INFO_EXTRA < info->key_id_size ||
|
|
UINT32_MAX - FF_ENCRYPTION_INFO_EXTRA - info->key_id_size < info->iv_size ||
|
|
(UINT32_MAX - FF_ENCRYPTION_INFO_EXTRA - info->key_id_size - info->iv_size) / 8 < info->subsample_count) {
|
|
return NULL;
|
|
}
|
|
|
|
*size = FF_ENCRYPTION_INFO_EXTRA + info->key_id_size + info->iv_size +
|
|
(info->subsample_count * 8);
|
|
cur_buffer = buffer = av_malloc(*size);
|
|
if (!buffer)
|
|
return NULL;
|
|
|
|
AV_WB32(cur_buffer, info->scheme);
|
|
AV_WB32(cur_buffer + 4, info->crypt_byte_block);
|
|
AV_WB32(cur_buffer + 8, info->skip_byte_block);
|
|
AV_WB32(cur_buffer + 12, info->key_id_size);
|
|
AV_WB32(cur_buffer + 16, info->iv_size);
|
|
AV_WB32(cur_buffer + 20, info->subsample_count);
|
|
cur_buffer += 24;
|
|
memcpy(cur_buffer, info->key_id, info->key_id_size);
|
|
cur_buffer += info->key_id_size;
|
|
memcpy(cur_buffer, info->iv, info->iv_size);
|
|
cur_buffer += info->iv_size;
|
|
for (i = 0; i < info->subsample_count; i++) {
|
|
AV_WB32(cur_buffer, info->subsamples[i].bytes_of_clear_data);
|
|
AV_WB32(cur_buffer + 4, info->subsamples[i].bytes_of_protected_data);
|
|
cur_buffer += 8;
|
|
}
|
|
|
|
return buffer;
|
|
}
|
|
|
|
// The format of the AVEncryptionInitInfo side data:
|
|
// u32be init_info_count
|
|
// {
|
|
// u32be system_id_size
|
|
// u32be num_key_ids
|
|
// u32be key_id_size
|
|
// u32be data_size
|
|
// u8[system_id_size] system_id
|
|
// u8[key_id_size][num_key_id] key_ids
|
|
// u8[data_size] data
|
|
// }[init_info_count]
|
|
|
|
#define FF_ENCRYPTION_INIT_INFO_EXTRA 16
|
|
|
|
AVEncryptionInitInfo *av_encryption_init_info_alloc(
|
|
uint32_t system_id_size, uint32_t num_key_ids, uint32_t key_id_size, uint32_t data_size)
|
|
{
|
|
AVEncryptionInitInfo *info;
|
|
uint32_t i;
|
|
|
|
info = av_mallocz(sizeof(*info));
|
|
if (!info)
|
|
return NULL;
|
|
|
|
info->system_id = av_mallocz(system_id_size);
|
|
info->system_id_size = system_id_size;
|
|
info->key_ids = key_id_size ? av_mallocz_array(num_key_ids, sizeof(*info->key_ids)) : NULL;
|
|
info->num_key_ids = num_key_ids;
|
|
info->key_id_size = key_id_size;
|
|
info->data = av_mallocz(data_size);
|
|
info->data_size = data_size;
|
|
|
|
// Allow pointers to be NULL if the size is 0.
|
|
if ((!info->system_id && system_id_size) || (!info->data && data_size) ||
|
|
(!info->key_ids && num_key_ids && key_id_size)) {
|
|
av_encryption_init_info_free(info);
|
|
return NULL;
|
|
}
|
|
|
|
if (key_id_size) {
|
|
for (i = 0; i < num_key_ids; i++) {
|
|
info->key_ids[i] = av_mallocz(key_id_size);
|
|
if (!info->key_ids[i]) {
|
|
av_encryption_init_info_free(info);
|
|
return NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
return info;
|
|
}
|
|
|
|
void av_encryption_init_info_free(AVEncryptionInitInfo *info)
|
|
{
|
|
uint32_t i;
|
|
if (info) {
|
|
for (i = 0; i < info->num_key_ids; i++) {
|
|
av_free(info->key_ids[i]);
|
|
}
|
|
av_encryption_init_info_free(info->next);
|
|
av_free(info->system_id);
|
|
av_free(info->key_ids);
|
|
av_free(info->data);
|
|
av_free(info);
|
|
}
|
|
}
|
|
|
|
AVEncryptionInitInfo *av_encryption_init_info_get_side_data(
|
|
const uint8_t *side_data, size_t side_data_size)
|
|
{
|
|
// |ret| tracks the front of the list, |info| tracks the back.
|
|
AVEncryptionInitInfo *ret = NULL, *info, *temp_info;
|
|
uint64_t system_id_size, num_key_ids, key_id_size, data_size, i, j;
|
|
uint64_t init_info_count;
|
|
|
|
if (!side_data || side_data_size < 4)
|
|
return NULL;
|
|
|
|
init_info_count = AV_RB32(side_data);
|
|
side_data += 4;
|
|
side_data_size -= 4;
|
|
for (i = 0; i < init_info_count; i++) {
|
|
if (side_data_size < FF_ENCRYPTION_INIT_INFO_EXTRA) {
|
|
av_encryption_init_info_free(ret);
|
|
return NULL;
|
|
}
|
|
|
|
system_id_size = AV_RB32(side_data);
|
|
num_key_ids = AV_RB32(side_data + 4);
|
|
key_id_size = AV_RB32(side_data + 8);
|
|
data_size = AV_RB32(side_data + 12);
|
|
|
|
// UINT32_MAX + UINT32_MAX + UINT32_MAX * UINT32_MAX == UINT64_MAX
|
|
if (side_data_size - FF_ENCRYPTION_INIT_INFO_EXTRA < system_id_size + data_size + num_key_ids * key_id_size) {
|
|
av_encryption_init_info_free(ret);
|
|
return NULL;
|
|
}
|
|
side_data += FF_ENCRYPTION_INIT_INFO_EXTRA;
|
|
side_data_size -= FF_ENCRYPTION_INIT_INFO_EXTRA;
|
|
|
|
temp_info = av_encryption_init_info_alloc(system_id_size, num_key_ids, key_id_size, data_size);
|
|
if (!temp_info) {
|
|
av_encryption_init_info_free(ret);
|
|
return NULL;
|
|
}
|
|
if (i == 0) {
|
|
info = ret = temp_info;
|
|
} else {
|
|
info->next = temp_info;
|
|
info = temp_info;
|
|
}
|
|
|
|
memcpy(info->system_id, side_data, system_id_size);
|
|
side_data += system_id_size;
|
|
side_data_size -= system_id_size;
|
|
for (j = 0; j < num_key_ids; j++) {
|
|
memcpy(info->key_ids[j], side_data, key_id_size);
|
|
side_data += key_id_size;
|
|
side_data_size -= key_id_size;
|
|
}
|
|
memcpy(info->data, side_data, data_size);
|
|
side_data += data_size;
|
|
side_data_size -= data_size;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
uint8_t *av_encryption_init_info_add_side_data(const AVEncryptionInitInfo *info, size_t *side_data_size)
|
|
{
|
|
const AVEncryptionInitInfo *cur_info;
|
|
uint8_t *buffer, *cur_buffer;
|
|
uint32_t i, init_info_count;
|
|
uint64_t temp_side_data_size;
|
|
|
|
temp_side_data_size = 4;
|
|
init_info_count = 0;
|
|
for (cur_info = info; cur_info; cur_info = cur_info->next) {
|
|
temp_side_data_size += (uint64_t)FF_ENCRYPTION_INIT_INFO_EXTRA + cur_info->system_id_size + cur_info->data_size;
|
|
if (init_info_count == UINT32_MAX || temp_side_data_size > UINT32_MAX) {
|
|
return NULL;
|
|
}
|
|
init_info_count++;
|
|
|
|
if (cur_info->num_key_ids) {
|
|
temp_side_data_size += (uint64_t)cur_info->num_key_ids * cur_info->key_id_size;
|
|
if (temp_side_data_size > UINT32_MAX) {
|
|
return NULL;
|
|
}
|
|
}
|
|
}
|
|
*side_data_size = temp_side_data_size;
|
|
|
|
cur_buffer = buffer = av_malloc(*side_data_size);
|
|
if (!buffer)
|
|
return NULL;
|
|
|
|
AV_WB32(cur_buffer, init_info_count);
|
|
cur_buffer += 4;
|
|
for (cur_info = info; cur_info; cur_info = cur_info->next) {
|
|
AV_WB32(cur_buffer, cur_info->system_id_size);
|
|
AV_WB32(cur_buffer + 4, cur_info->num_key_ids);
|
|
AV_WB32(cur_buffer + 8, cur_info->key_id_size);
|
|
AV_WB32(cur_buffer + 12, cur_info->data_size);
|
|
cur_buffer += 16;
|
|
|
|
memcpy(cur_buffer, cur_info->system_id, cur_info->system_id_size);
|
|
cur_buffer += cur_info->system_id_size;
|
|
for (i = 0; i < cur_info->num_key_ids; i++) {
|
|
memcpy(cur_buffer, cur_info->key_ids[i], cur_info->key_id_size);
|
|
cur_buffer += cur_info->key_id_size;
|
|
}
|
|
if (cur_info->data_size > 0) {
|
|
memcpy(cur_buffer, cur_info->data, cur_info->data_size);
|
|
cur_buffer += cur_info->data_size;
|
|
}
|
|
}
|
|
|
|
return buffer;
|
|
}
|