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tcp_isn: use ROM APIs for md5 calculations

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This commit is contained in:
Mahavir Jain 2020-10-15 19:09:10 +05:30 committed by bot
parent b8925ab48b
commit 8099dd089d
2 changed files with 19 additions and 16 deletions
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29
components/lwip/port/esp32/tcp_isn/tcp_isn.c
View File

@ -74,17 +74,10 @@
#include "lwip/ip_addr.h"
#include "lwip/sys.h"
#include <string.h>
#include "esp_rom_md5.h"
#ifdef LWIP_HOOK_TCP_ISN
/* pull in md5 of ppp? */
#include "netif/ppp/ppp_opts.h"
#if !PPP_SUPPORT || (!LWIP_USE_EXTERNAL_POLARSSL && !LWIP_USE_EXTERNAL_MBEDTLS)
#undef LWIP_INCLUDED_POLARSSL_MD5
#define LWIP_INCLUDED_POLARSSL_MD5 1
#include "netif/ppp/polarssl/md5.h"
#endif
static u8_t input[64];
static u32_t base_time;
@ -119,7 +112,6 @@ u32_t
lwip_hook_tcp_isn(const ip_addr_t *local_ip, u16_t local_port,
const ip_addr_t *remote_ip, u16_t remote_port)
{
md5_context ctx;
u8_t output[16];
u32_t isn;
@ -167,10 +159,21 @@ lwip_hook_tcp_isn(const ip_addr_t *local_ip, u16_t local_port,
/* The secret and padding are already filled in. */
/* Generate the hash, using MD5. */
md5_starts(&ctx);
md5_update(&ctx, input, sizeof(input));
md5_finish(&ctx, output);
/*
* Generate the hash using ROM MD5 APIs
* This hook is invoked in the context of TCP/IP (tiT) task and
* it is unlikely that its stack would be placed in SPIRAM. Hence
* even with SPIRAM enabled case and ESP32 revision < 3, using ROM
* APIs should not create any issues.
*/
#if CONFIG_SPIRAM_ALLOW_STACK_EXTERNAL_MEMORY
assert(!esp_ptr_external_ram(get_sp()));
#endif
struct MD5Context ctx;
esp_rom_md5_init(&ctx);
esp_rom_md5_update(&ctx, input, sizeof(input));
esp_rom_md5_final(output, &ctx);
/* Arbitrarily take the first 32 bits from the generated hash. */
MEMCPY(&isn, output, sizeof(isn));

6
components/lwip/port/esp32/tcp_isn/tcp_isn.h
View File

@ -27,8 +27,8 @@
* Author: David van Moolenbroek <david@minix3.org>
*/
#ifndef LWIP_HDR_CONTRIB_ADDONS_TCP_ISN_H
#define LWIP_HDR_CONTRIB_ADDONS_TCP_ISN_H
#ifndef LWIP_TCP_ISN_H
#define LWIP_TCP_ISN_H
#include "lwip/opt.h"
#include "lwip/ip_addr.h"
@ -45,4 +45,4 @@ u32_t lwip_hook_tcp_isn(const ip_addr_t *local_ip, u16_t local_port,
}
#endif
#endif /* LWIP_HDR_CONTRIB_ADDONS_TCP_ISN_H */
#endif /* LWIP_TCP_ISN_H */