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WIP cryptographic design

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This commit is contained in:
jaseg 2020-03-09 22:10:46 +01:00
parent b0a5232487
commit 6880468862
9 changed files with 292 additions and 6 deletions
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48
controller/fw/src/crypto.c Normal file
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@ -0,0 +1,48 @@
#include <unistd.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <aes.h>
#include "crypto.h"
#include "simulation.h"
void debug_hexdump(const char *name, uint8_t *buf, size_t len);
void debug_hexdump(const char *name, uint8_t *buf, size_t len) {
DEBUG_PRINTN("%20s: ", name);
for (size_t i=0; i<len;) {
for (size_t j=0; j<8 && i<len; i++, j++)
DEBUG_PRINTN("%02x ", buf[i]);
DEBUG_PRINTN(" ");
}
DEBUG_PRINTN("\n");
}
int oob_message_received(uint8_t msg[static OOB_TRIGGER_LEN]) {
struct AES_ctx ctx;
uint8_t buf[crypto_sign_BYTES];
for (size_t serial=0; serial<PRESIG_STORE_SIZE; serial++) {
for (size_t dom=0; dom<_TRIGGER_DOMAIN_COUNT; dom++) {
DEBUG_PRINT("Trying domain %zd serial %zd", dom, serial);
debug_hexdump("oob_presig_iv", oob_presig_iv, sizeof(oob_presig_iv));
memcpy(buf, presig_store[dom][serial], crypto_sign_BYTES);
debug_hexdump("presig", buf, sizeof(buf));
AES_init_ctx_iv(&ctx, msg, oob_presig_iv);
AES_CBC_decrypt_buffer(&ctx, buf, crypto_sign_BYTES);
debug_hexdump("decrypted", buf, sizeof(buf));
if (!crypto_sign_verify_detached(buf, presig_messages[dom][serial], PRESIG_MSG_LEN, oob_trigger_pubkey)) {
oob_trigger_activated(dom, presig_first_serial + serial);
return 1;
}
DEBUG_PRINTN("\n");
}
}
return 0;
}

33
controller/fw/src/crypto.h Normal file
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@ -0,0 +1,33 @@
#ifndef __CRYPTO_H__
#define __CRYPTO_H__
#include <stdint.h>
#include <sodium.h>
#define OOB_TRIGGER_LEN 16
#define PRESIG_MSG_LEN 16
enum trigger_domain {
TRIGGER_DOMAIN_ALL,
TRIGGER_DOMAIN_VENDOR,
TRIGGER_DOMAIN_SERIES,
TRIGGER_DOMAIN_COUNTRY,
TRIGGER_DOMAIN_REGION,
_TRIGGER_DOMAIN_COUNT
};
extern uint8_t presig_store[_TRIGGER_DOMAIN_COUNT][PRESIG_STORE_SIZE][crypto_sign_BYTES];
extern uint8_t oob_trigger_pubkey[crypto_sign_PUBLICKEYBYTES];
extern uint8_t presig_messages[_TRIGGER_DOMAIN_COUNT][PRESIG_STORE_SIZE][PRESIG_MSG_LEN];
extern uint8_t oob_presig_iv[16];
extern int presig_first_serial;
extern void oob_trigger_activated(enum trigger_domain domain, int serial);
int oob_message_received(uint8_t msg[static OOB_TRIGGER_LEN]);
#endif /* __CRYPTO_H__ */

2
controller/fw/src/dsss_demod.c
View file

@ -248,7 +248,6 @@ void group_received(struct dsss_demod_state *st) {
/* If we found empty entries, replace one by a new decoding starting at this group */
if (empty_idx >= 0) {
DEBUG_PRINT("Writing to %zd", empty_idx);
assert(0 <= empty_idx && empty_idx < DSSS_MATCHER_CACHE_SIZE);
st->matcher_cache[empty_idx].last_phase = group_phase;
st->matcher_cache[empty_idx].candidate_score = base_score;
@ -261,7 +260,6 @@ void group_received(struct dsss_demod_state *st) {
/* If the weakest decoding in cache is weaker than a new decoding starting here, replace it */
} else if (min_score < base_score && min_idx >= 0) {
DEBUG_PRINT("Writing to %zd", min_idx);
assert(0 <= min_idx && min_idx < DSSS_MATCHER_CACHE_SIZE);
st->matcher_cache[min_idx].last_phase = group_phase;
st->matcher_cache[min_idx].candidate_score = base_score;

2
controller/fw/src/dsss_demod.h
View file

@ -63,7 +63,7 @@ struct dsss_demod_state {
};
extern void handle_dsss_received(uint8_t data[TRANSMISSION_SYMBOLS]);
extern void handle_dsss_received(uint8_t data[static TRANSMISSION_SYMBOLS]);
void dsss_demod_init(struct dsss_demod_state *st);
void dsss_demod_step(struct dsss_demod_state *st, float new_value, uint64_t ts);