Klagarge/SRE
1
0
Fork 0
Code Issues Pull Requests Actions Releases Activity

ADD A3 solution, miss report

Browse Source
This commit is contained in:
Rémi Heredero 2025-04-13 15:00:04 +02:00
parent bf645048e6
commit 1e7895f21a
Signed by: Klagarge
GPG Key ID: 735B36B074A65F0F
9 changed files with 30225 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

0
03-Average3/A3 Normal file → Executable file
View File

6
03-Average3/A3.txt Normal file
View File

@ -0,0 +1,6 @@
1. What is the algorithm used to check the validity of a password?
2. This program relies on a specific trick. How does it work?
3. Can you recover the secret password? You must send 1 the valid password by email to pascal+sre25@mod-p.ch before Apr. 28th, 2025, 12h00 CET to validate this lab and get 10 points.
JFuzhFSI4YShfqE7

30153
03-Average3/code.c Normal file
View File

File diff suppressed because it is too large Load Diff

52
03-Average3/pw.c Normal file
View File

@ -0,0 +1,52 @@
#include <stdio.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include <sys/types.h>
#include <signal.h>
#include <sys/ptrace.h>
// uVar4 = 1396505404 = 0x533CFB3C
// uVar5 = 2294410125 = 0x88C1EB8D
// uVar6 = 2929865363 = 0xAEA23293
uint8_t main(int argc, char** argv) {
char* list = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ+-";
uint32_t uVar4 = 1396505404;
uint32_t uVar5 = 929308192;
uint32_t uVar6 = 2929865363;
char password[17];
password[16] = '\0';
password[0] = list[uVar6 >> 0x1a];
password[1] = list[uVar6 >> 0x14 & 0x3f];
password[2] = list[uVar6 >> 0xe & 0x3f];
// [uVar6 >> 8 & 0x3f] ^ password[3] |
password[3] = list[uVar6 >> 8 & 0x3f];
// [uVar6 >> 2 & 0x3f] ^ password[4] |
password[4] = list[uVar6 >> 2 & 0x3f];
// [(uVar6 & 3) << 4 | uVar4 >> 0x1c] ^ password[5] |
password[5] = list[(uVar6 & 3) << 4 | uVar4 >> 0x1c];
// [uVar4 >> 0x16 & 0x3f] ^ password[6] |
password[6] = list[uVar4 >> 0x16 & 0x3f];
// [uVar4 >> 0x10 & 0x3f] ^ password[7] |
password[7] = list[uVar4 >> 0x10 & 0x3f];
// [uVar4 >> 10 & 0x3f] ^ password[8] |
password[8] = list[uVar4 >> 10 & 0x3f];
// [uVar4 >> 4 & 0x3f] ^ password[9] |
password[9] = list[uVar4 >> 4 & 0x3f];
// [uVar5 >> 0x1e | (uVar4 & 0xf) << 2] ^ password[10] |
password[10] = list[uVar5 >> 0x1e | (uVar4 & 0xf) << 2];
// [uVar5 >> 0x18 & 0x3f] ^ password[11] |
password[11] = list[uVar5 >> 0x18 & 0x3f];
// [uVar5 >> 0x12 & 0x3f] ^ password[12] |
password[12] = list[uVar5 >> 0x12 & 0x3f];
// [uVar5 >> 0xc & 0x3f] ^ password[13] |
password[13] = list[uVar5 >> 0xc & 0x3f];
// [uVar5 >> 6 & 0x3f] ^ password[14] |
password[14] = list[uVar5 >> 6 & 0x3f];
// [uVar5 & 0x3f] ^ password[15]
password[15] = list[uVar5 & 0x3f];
printf("%s\n", password);
return 0;
}

4
SRE.rep/idata/~index.bak
View File

@ -1,10 +1,12 @@
VERSION=1
/
00000001:A1:a801f6f89b95769364193802
00000006:A3:a801f56ab658487152928151
00000007:D1:c0a82d69e3b15562440310963
00000000:E4:a801f6f84bf5726727918611
00000002:HelloRust:c0a82f6ac5f11262297970056
00000005:liba2.so:c0a82678bad57470710627698
/E5.apk
00000004:DebugProbesKt.bin:a947c5a05d160355288677079
NEXT-ID:6
NEXT-ID:8
MD5:d41d8cd98f00b204e9800998ecf8427e

3
SRE.rep/idata/~index.dat
View File

@ -2,10 +2,11 @@ VERSION=1
/
00000001:A1:a801f6f89b95769364193802
00000006:A3:a801f56ab658487152928151
00000007:D1:c0a82d69e3b15562440310963
00000000:E4:a801f6f84bf5726727918611
00000002:HelloRust:c0a82f6ac5f11262297970056
00000005:liba2.so:c0a82678bad57470710627698
/E5.apk
00000004:DebugProbesKt.bin:a947c5a05d160355288677079
NEXT-ID:7
NEXT-ID:8
MD5:d41d8cd98f00b204e9800998ecf8427e

3
SRE.rep/user/~index.bak
View File

@ -3,6 +3,7 @@ VERSION=1
00000000:udf_a801f6f84bf5726727918611:a801f6f835112597744365961
00000001:udf_a801f6f89b95769364193802:c0a82ee829520057231966697
00000003:udf_a947c5a05d160355288677079:a947c5b473161854856522726
00000004:udf_c0a82678bad57470710627698:c0a82679e4158658428888916
00000002:udf_c0a82f6ac5f11262297970056:a801f2faf4d101904923747351
NEXT-ID:4
NEXT-ID:5
MD5:d41d8cd98f00b204e9800998ecf8427e

4
SRE.rep/user/~index.dat
View File

@ -1,9 +1,11 @@
VERSION=1
/
00000005:udf_a801f56ab658487152928151:c0a82d6804915544445885584
00000000:udf_a801f6f84bf5726727918611:a801f6f835112597744365961
00000001:udf_a801f6f89b95769364193802:c0a82ee829520057231966697
00000003:udf_a947c5a05d160355288677079:a947c5b473161854856522726
00000004:udf_c0a82678bad57470710627698:c0a82679e4158658428888916
00000006:udf_c0a82d69e3b15562440310963:c0a82d68fef15936786772401
00000002:udf_c0a82f6ac5f11262297970056:a801f2faf4d101904923747351
NEXT-ID:5
NEXT-ID:7
MD5:d41d8cd98f00b204e9800998ecf8427e

6
SRE.rep/user/~journal.bak
View File

@ -1,2 +1,4 @@
IADD:00000004:/udf_c0a82678bad57470710627698
IDSET:/udf_c0a82678bad57470710627698:c0a82679e4158658428888916
IADD:00000005:/udf_a801f56ab658487152928151
IDSET:/udf_a801f56ab658487152928151:c0a82d6804915544445885584
IADD:00000006:/udf_c0a82d69e3b15562440310963
IDSET:/udf_c0a82d69e3b15562440310963:c0a82d68fef15936786772401