gx
dcecd42de4
Snapshot FFmpeg n7.1 (release tag) с применённым patch'ем для cuframes input format. Используется как FFMPEG_REPO_OVERRIDE в NickM-27/FFmpeg-Builds fork для статической сборки patched binary под Frigate (Debian 12 / glibc 2.36). Apply changes: + libavformat/cuframesdec.c (новый — реализация демуксера) M libavformat/Makefile (CONFIG_CUFRAMES_DEMUXER target) M libavformat/allformats.c (extern declaration) M configure (--enable-libcuframes option + dep check) Patch source: https://git.goldix.org/gx/cuframes (filter/ffmpeg-7.1-cuframes-demuxer.patch) History сброшена (snapshot вместо fork) потому что upstream shallow clone не позволял push в gitea. Полная история FFmpeg — на github.com/FFmpeg/FFmpeg n7.1.
132 lines
3.3 KiB
C
132 lines
3.3 KiB
C
/*
|
|
* AES-CTR cipher
|
|
* Copyright (c) 2015 Eran Kornblau <erankor at gmail dot com>
|
|
*
|
|
* 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 <string.h>
|
|
|
|
#include "aes_ctr.h"
|
|
#include "aes.h"
|
|
#include "aes_internal.h"
|
|
#include "macros.h"
|
|
#include "mem.h"
|
|
#include "random_seed.h"
|
|
|
|
#define AES_BLOCK_SIZE (16)
|
|
|
|
typedef struct AVAESCTR {
|
|
uint8_t counter[AES_BLOCK_SIZE];
|
|
uint8_t encrypted_counter[AES_BLOCK_SIZE];
|
|
int block_offset;
|
|
AVAES aes;
|
|
} AVAESCTR;
|
|
|
|
struct AVAESCTR *av_aes_ctr_alloc(void)
|
|
{
|
|
return av_mallocz(sizeof(struct AVAESCTR));
|
|
}
|
|
|
|
void av_aes_ctr_set_iv(struct AVAESCTR *a, const uint8_t* iv)
|
|
{
|
|
memcpy(a->counter, iv, AES_CTR_IV_SIZE);
|
|
memset(a->counter + AES_CTR_IV_SIZE, 0, sizeof(a->counter) - AES_CTR_IV_SIZE);
|
|
a->block_offset = 0;
|
|
}
|
|
|
|
void av_aes_ctr_set_full_iv(struct AVAESCTR *a, const uint8_t* iv)
|
|
{
|
|
memcpy(a->counter, iv, sizeof(a->counter));
|
|
a->block_offset = 0;
|
|
}
|
|
|
|
const uint8_t* av_aes_ctr_get_iv(struct AVAESCTR *a)
|
|
{
|
|
return a->counter;
|
|
}
|
|
|
|
void av_aes_ctr_set_random_iv(struct AVAESCTR *a)
|
|
{
|
|
uint32_t iv[2];
|
|
|
|
iv[0] = av_get_random_seed();
|
|
iv[1] = av_get_random_seed();
|
|
|
|
av_aes_ctr_set_iv(a, (uint8_t*)iv);
|
|
}
|
|
|
|
int av_aes_ctr_init(struct AVAESCTR *a, const uint8_t *key)
|
|
{
|
|
av_aes_init(&a->aes, key, 128, 0);
|
|
|
|
memset(a->counter, 0, sizeof(a->counter));
|
|
a->block_offset = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void av_aes_ctr_free(struct AVAESCTR *a)
|
|
{
|
|
av_free(a);
|
|
}
|
|
|
|
static void av_aes_ctr_increment_be64(uint8_t* counter)
|
|
{
|
|
uint8_t* cur_pos;
|
|
|
|
for (cur_pos = counter + 7; cur_pos >= counter; cur_pos--) {
|
|
(*cur_pos)++;
|
|
if (*cur_pos != 0) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
void av_aes_ctr_increment_iv(struct AVAESCTR *a)
|
|
{
|
|
av_aes_ctr_increment_be64(a->counter);
|
|
memset(a->counter + AES_CTR_IV_SIZE, 0, sizeof(a->counter) - AES_CTR_IV_SIZE);
|
|
a->block_offset = 0;
|
|
}
|
|
|
|
void av_aes_ctr_crypt(struct AVAESCTR *a, uint8_t *dst, const uint8_t *src, int count)
|
|
{
|
|
const uint8_t* src_end = src + count;
|
|
const uint8_t* cur_end_pos;
|
|
uint8_t* encrypted_counter_pos;
|
|
|
|
while (src < src_end) {
|
|
if (a->block_offset == 0) {
|
|
av_aes_crypt(&a->aes, a->encrypted_counter, a->counter, 1, NULL, 0);
|
|
|
|
av_aes_ctr_increment_be64(a->counter + 8);
|
|
}
|
|
|
|
encrypted_counter_pos = a->encrypted_counter + a->block_offset;
|
|
cur_end_pos = src + AES_BLOCK_SIZE - a->block_offset;
|
|
cur_end_pos = FFMIN(cur_end_pos, src_end);
|
|
|
|
a->block_offset += cur_end_pos - src;
|
|
a->block_offset &= (AES_BLOCK_SIZE - 1);
|
|
|
|
while (src < cur_end_pos) {
|
|
*dst++ = *src++ ^ *encrypted_counter_pos++;
|
|
}
|
|
}
|
|
}
|