violette/crypto2
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

main: small changes, inling and auto mac hijacking

Browse source
This commit is contained in:
theBigBlase 2023-10-06 21:37:28 -04:00
parent 8a6ffdedb1
commit c744b597c4
2 changed files with 28 additions and 26 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
Makefile
View file

@ -5,7 +5,7 @@ OJB = $(SRC:.c=.o)
OUT = build
CC = /usr/bin/gcc
CFLAGS = -ansi -Wall -std=c99 -O0
CFLAGS = -ansi -Wall -fsanitize=address -std=c99 -O0
CFDEBUG = -ansi -Wall -g -std=c99
RM = /bin/rm -fr
TEST = -D TEST_TECH

52
src/main.c
View file

@ -27,15 +27,13 @@ struct eve {
uint32_t tag;
};
static uint32_t mac(uint32_t, uint32_t);
static char verif(uint32_t, uint32_t, uint32_t);
static inline uint32_t mac(uint32_t, uint32_t);
static inline char verif(uint32_t, uint32_t, uint32_t);
static inline uint32_t gen();
static uint32_t char_arr_to_uint32(char *);
static inline uint32_t char_arr_to_uint32(char *);
static struct eve eve_shenanigans(struct eve);
static char * uint32_to_char_arr(uint32_t n);
static void print_hex(char *);
int
main(int argc, char *argv[])
{
@ -72,8 +70,12 @@ main(int argc, char *argv[])
printf("%u\n", msg);
#endif
char *msg_char = uint32_to_char_arr(msg);
printf("as char *: %s\nas uint32: %u\n",
uint32_to_char_arr(msg), msg);
msg_char, msg);
free(msg_char);
uint32_t tag = mac(msg, key);
printf("--- TAG ---\n%d \n", tag);
@ -97,13 +99,16 @@ main(int argc, char *argv[])
printf("knows key: %u\n", key);
char res = verif(msg, tag, key);
printf("verifies: %s\n", res ? "TRUE" : "FALSE");
if (res)
printf("msg as char *: %s\n", uint32_to_char_arr(msg));
if (res) {
msg_char = uint32_to_char_arr(msg);
printf("msg as char *: %s\n", msg_char);
free(msg_char);
}
return 0;
}
static uint32_t
static inline uint32_t
gen()
{
/* rand is between 0 and UINT32_MAX - 1 / 2 (because sign) */
@ -114,31 +119,39 @@ static struct eve
eve_shenanigans(struct eve str)
{
#ifdef EVE_NAME
uint32_t old_msg = str.msg;
str.msg = *(uint32_t *)"eve";
str.tag = str.tag ^ (*(uint32_t *)"bob") ^ str.msg;
str.tag = str.tag ^ old_msg ^ str.msg;
#endif
#ifdef EVE_ZERO
uint32_t old_msg = str.msg;
str.msg = 0;
str.tag = str.tag ^ old_msg ^ str.msg;
#endif
#ifdef EVE_MAX
uint32_t old_msg = str.msg;
str.msg = UINT32_MAX;
str.tag = str.tag ^ 0 ^ str.msg;
str.tag = str.tag ^ old_msg ^ str.msg;
#endif
return str;
}
static char
static inline char
verif(uint32_t key, uint32_t msg, uint32_t tag)
{
return (key ^ msg) == tag;
}
static uint32_t
static inline uint32_t
mac(uint32_t key, uint32_t msg)
{
return msg ^ key;
}
static uint32_t
static inline uint32_t
char_arr_to_uint32(char *arr)
{
return *(uint32_t *)arr;
@ -155,14 +168,3 @@ uint32_to_char_arr(uint32_t n)
return res;
}
static void
print_hex(char *str)
{
short k = 0;
while (str[k] != '\0') {
printf("%02X ", str[k] & 0xff);
++k;
}
printf("\n");
}