ADD D1 report

01-VeryEasy3/VE3.rep/idata/00/00000000.prp

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<FILE_INFO>
+    <BASIC_INFO>
+        <STATE NAME="CONTENT_TYPE" TYPE="string" VALUE="Program" />
+        <STATE NAME="PARENT" TYPE="string" VALUE="/" />
+        <STATE NAME="FILE_ID" TYPE="string" VALUE="a2e40c5a22540267163090739" />
+        <STATE NAME="FILE_TYPE" TYPE="int" VALUE="0" />
+        <STATE NAME="READ_ONLY" TYPE="boolean" VALUE="false" />
+        <STATE NAME="NAME" TYPE="string" VALUE="VE3" />
+    </BASIC_INFO>
+</FILE_INFO>

01-VeryEasy3/VE3.rep/idata/~index.bak

@@ -0,0 +1,4 @@
+VERSION=1
+/
+NEXT-ID:0
+MD5:d41d8cd98f00b204e9800998ecf8427e

01-VeryEasy3/VE3.rep/idata/~index.dat

@@ -0,0 +1,5 @@
+VERSION=1
+/
+  00000000:VE3:a2e40c5a22540267163090739
+NEXT-ID:1
+MD5:d41d8cd98f00b204e9800998ecf8427e

01-VeryEasy3/VE3.rep/idata/~journal.bak

@@ -0,0 +1,2 @@
+IADD:00000000:/VE3
+IDSET:/VE3:a2e40c5a22540267163090739

01-VeryEasy3/VE3.rep/project.prp

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<FILE_INFO>
+    <BASIC_INFO>
+        <STATE NAME="OWNER" TYPE="string" VALUE="remi" />
+    </BASIC_INFO>
+</FILE_INFO>

01-VeryEasy3/VE3.rep/projectState

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<PROJECT>
+    <PROJECT_DATA_XML_NAME NAME="DISPLAY_DATA">
+        <SAVE_STATE>
+            <ARRAY NAME="EXPANDED_PATHS" TYPE="string">
+                <A VALUE="VE3:" />
+            </ARRAY>
+            <STATE NAME="SHOW_TABLE" TYPE="boolean" VALUE="false" />
+        </SAVE_STATE>
+    </PROJECT_DATA_XML_NAME>
+    <TOOL_MANAGER ACTIVE_WORKSPACE="Workspace">
+        <WORKSPACE NAME="Workspace" ACTIVE="true" />
+    </TOOL_MANAGER>
+</PROJECT>
+

01-VeryEasy3/VE3.rep/user/00/00000000.prp

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<FILE_INFO>
+    <BASIC_INFO>
+        <STATE NAME="CONTENT_TYPE" TYPE="string" VALUE="ProgramUserData" />
+        <STATE NAME="PARENT" TYPE="string" VALUE="/" />
+        <STATE NAME="FILE_ID" TYPE="string" VALUE="a2e40c594c340888329008539" />
+        <STATE NAME="FILE_TYPE" TYPE="int" VALUE="0" />
+        <STATE NAME="READ_ONLY" TYPE="boolean" VALUE="false" />
+        <STATE NAME="NAME" TYPE="string" VALUE="udf_a2e40c5a22540267163090739" />
+    </BASIC_INFO>
+</FILE_INFO>

01-VeryEasy3/VE3.rep/user/~index.bak

@@ -0,0 +1,4 @@
+VERSION=1
+/
+NEXT-ID:0
+MD5:d41d8cd98f00b204e9800998ecf8427e

01-VeryEasy3/VE3.rep/user/~index.dat

@@ -0,0 +1,5 @@
+VERSION=1
+/
+  00000000:udf_a2e40c5a22540267163090739:a2e40c594c340888329008539
+NEXT-ID:1
+MD5:d41d8cd98f00b204e9800998ecf8427e

01-VeryEasy3/VE3.rep/user/~journal.bak

@@ -0,0 +1,2 @@
+IADD:00000000:/udf_a2e40c5a22540267163090739
+IDSET:/udf_a2e40c5a22540267163090739:a2e40c594c340888329008539

01-VeryEasy3/VE3.rep/versioned/~index.bak

@@ -0,0 +1,4 @@
+VERSION=1
+/
+NEXT-ID:0
+MD5:d41d8cd98f00b204e9800998ecf8427e

01-VeryEasy3/VE3.rep/versioned/~index.dat

@@ -0,0 +1,4 @@
+VERSION=1
+/
+NEXT-ID:0
+MD5:d41d8cd98f00b204e9800998ecf8427e

01-VeryEasy3/VE3.txt

@@ -0,0 +1,8 @@
+1. What is the target platform of this executable?
+ARM32
+
+2. Was this executable stripped?
+no
+
+3. What is the secret password hardcoded into this executable? You must send this value by email to pascal+sre25@mod-p.ch before Mar. 10th, 2025, 12h00 CET to validate this lab and get 1 point.
+33X5yPBehep4

01-VeryEasy3/code.c

@@ -0,0 +1,52 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <string.h>
+#include <sys/types.h>
+
+bool check_password(char *param_1) {
+  bool uVar1;
+  //33X5yPBehep4
+  if (((((param_1[0] == '3') && (param_1[1] == '3')) && (param_1[2] == 'X')) &&
+      ((((param_1[3] == '5' && (param_1[4] == 'y')) &&
+        ((param_1[5] == 'P' && ((param_1[6] == 'B' && (param_1[7] == 'e')))))) &&
+       (param_1[8] == 'h')))) &&
+     (((param_1[9] == 'e' && (param_1[10] == 'p')) && (param_1[11] == '4')))) {
+    uVar1 = true;
+  }
+  else {
+    uVar1 = false;
+  }
+  return uVar1;
+}
+
+uint64_t main(int param_1,char* *param_2) {
+  size_t pw_length;
+  bool pw_correct;
+  uint64_t uVar3;
+
+  if (param_1 == 2) {
+    pw_length = strlen((char *)param_2[1]);
+    if (pw_length == 12) {
+      pw_correct = check_password(param_2[1]);
+      if (pw_correct == false) {
+        fwrite("\nWrong password ! Try again...\n\n",1,0x20,stderr);
+        uVar3 = 1;
+      }
+      else {
+        fprintf(stderr,"\nCongratulations ! The right password is indeed %s :-)\n\n",param_2[1]);
+        uVar3 = 0;
+      }
+    }
+    else {
+      fwrite("\nWrong password ! Try again...\n\n",1,0x20,stderr);
+      uVar3 = 1;
+    }
+  }
+  else {
+    fwrite("\nMSE-SRE Challenge VE3 --- Enjoy !\n",1,0x23,stderr);
+    fprintf(stderr,"\nUsage: %s <password>\n\n",*param_2);
+    uVar3 = 1;
+  }
+  return uVar3;
+}

02-Easy2/E2.rep/user/~index.dat

@@ -1,4 +1,5 @@
 VERSION=1
 /
-NEXT-ID:0
+  00000000:udf_c0a82eeaa7971421479596701:c0a82ee8e31106056027371797
+NEXT-ID:1
 MD5:d41d8cd98f00b204e9800998ecf8427e

02-Easy2/verificateur.c

@@ -0,0 +1,166 @@
+#include <signal.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <time.h>
+#include <string.h>
+
+typedef char char_array[13];
+const char psw[][13] = {
+    "pMuzxQDIgCV9",
+    "xCQzgmCBpqu2",
+    "Dum+EEIenoCD",
+    "MqO4VFBXthjf",
+    "kiv+IpcxMFrY",
+    "uTLfrYO4hRdX",
+    "GBnbBQ8XjL10",
+    "3dXLhhj74SUq",
+    "PBfQujB0JwCk",
+    "vFreTky8MrlW",
+    "Smw6NADYrsTe",
+    "5cDL1pbwkLA1",
+    "i3GK7GP+1+pj",
+    "cPgNAuWuMzW1",
+    "TJWgPtgZkaW7",
+    "SUsZXkg8dash",
+    "xfs6xhXloQLP",
+    "dk63xX3Wslbn",
+    "BiR0yzElTLpV",
+    "3SAoecG29oaW",
+    "+Lk+7uiysfeX",
+    "AfxPOnxqaWg+",
+    "vWc9cEJYzMNj",
+    "WxCQAWF1ypbj",
+    "rFLxXmdCEtO1",
+    "bPcTXLuhUCq6",
+    "BfL3NiQzcPzC",
+    "JFc2N+3Ok27w",
+    "WQILiwG1Qyiw",
+    "mssXMUL4OyXf",
+    "oi7gTr2+TDbF",
+    "NahPPldbqRk8",
+    "1XOVgQI19Vam",
+    "miYOZFsnXpM+",
+    "ifN7ACCjGzjW",
+    "iRJKqJejwGH+",
+    "dCUYAVy5JJKf",
+    "syOlpOJTlib2",
+    "uweQVZIpLrK+",
+    "rR20XegMEh2w",
+    "lSXVAeNeBiq9",
+    "eEwKPTvwZNf6",
+    "0BdTkJWu4WT+",
+    "HKA0ECJTbWln",
+    "liyGJbj+ITtf",
+    "+eP25hETqRrl",
+    "WtA5SIepkbCO",
+    "icfFukEtsWD8",
+    "HcI6RJanuvOR",
+    "b1y5L8mYAVsf",
+    "tz4biM6Qrhe9",
+    "4fg+oqIC4HIb",
+    "nckMGQuqFmy6",
+    "dIsiQQAPZGU3",
+    "dNy8AdudJukV",
+    "LYnXVcneueg7",
+    "mtV8FCVEDhgw",
+    "n13jYX70X6cP",
+    "xCr0CQfuTMsO",
+    "nudiMMUTLgV7",
+    "WrRamXQ8UudS",
+    "PMo4xkYuGyQK",
+    "CYxHOhUqcnJ3",
+    "oCmy07pF0+z5",
+    "nPOTiwYfhxq8",
+    "0VlM0kCqobH6",
+    "Ddh5malRFZcm",
+    "kRJBRdWxViz0",
+    "Wa2eMx8YuFm6",
+    "zOiuAuh+TefT",
+    "K9P6h3qoLUFS",
+    "MSBvMhPOodu3",
+    "zM1OXPd0MB2u",
+    "gkuyPlX8XXJK",
+    "HdlZhKJ9OpAi",
+    "En8xcW8EIfg7",
+    "eZdPe0Sqo5P+",
+    "pA+Ihqz5wo6v",
+    "nvlmrNF3sgMT",
+    "ZsemPae0eMgW",
+    "wVgVJa7mRh71",
+    "GQYaLJG1dDyZ",
+    "C9lWfSX6J5Sk",
+    "2lZ40pwtmCJJ",
+    "KPBXBco4flJf",
+    "yQF3pzfUftGl",
+    "8bg+9NfvnsfW",
+    "+WA8qISy5AuK",
+    "rjERNfwmSSU5",
+    "RaQ0otAuRJwO",
+    "zE49Ln2AYtar",
+    "CSj5J5ynf9tQ",
+    "ITzYuBxgSIe4",
+    "oneuxTg+xeeT",
+    "CLfsAQ2RmB3+",
+    "yTq9WfnRAmxa",
+    "Mqd2iTnAKzmy",
+    "HmG3eXvTBjVm",
+    "YIoYAOIxwYA+",
+    "0Kvr1Yt1nMeI",
+};
+
+bool hash(char* str){
+    char* str1 = str;
+    char* str2 = str;
+    uint32_t foo = 0x56253667;
+
+    do {
+        str2 = str1 + 4;
+        foo = foo ^ ((uint8_t)*str1 << 24 | (uint8_t)str1[1] << 16 | (uint8_t)str1[2] << 8 | (uint8_t)str1[3]);
+        str1 = str2;
+    } while (str + 12 != str2);
+    return foo == 0x397a516d ? true : false;
+}
+
+const char list[] = {
+    'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+    'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
+    '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
+    '/', '+'
+};
+char give_char(uint8_t index){
+    if (index >= sizeof(list)) {
+        printf("Error: Index out of bounds, max %zu\n", sizeof(list));
+        exit(1);
+    }
+    return list[index];
+}
+
+
+int main(int argc, char *argv[]) {
+    srand(time(NULL));
+
+    // seed = 0x56253667;
+    // answer = 0x3c3e386b;
+    uint8_t mdw[4] = {0x6F, 0x5F, 0x67, 0x0a};
+    // #define SOURCE_HASH 0x56 25 36 67
+    // #define DESTINATION_HASH 0x39 7a 51 6d
+
+    char password[13];
+    const uint8_t max_char = sizeof(list);
+
+
+    for(uint16_t n = 0; n < 100; n++) {
+        for(uint8_t c = 0; c < 12; c++) {
+            password[c] = psw[n][c];
+        }
+        password[12] = '\0';
+        if (hash(password)) {
+            printf("%s\n", password);
+        } else {
+            printf("Fuck: %s\n", password);
+        }
+    }
+}

02-Easy3/E3.rep/idata/00/00000000.prp

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<FILE_INFO>
+    <BASIC_INFO>
+        <STATE NAME="CONTENT_TYPE" TYPE="string" VALUE="Program" />
+        <STATE NAME="PARENT" TYPE="string" VALUE="/" />
+        <STATE NAME="FILE_ID" TYPE="string" VALUE="a2e40c5a09540945517759134" />
+        <STATE NAME="FILE_TYPE" TYPE="int" VALUE="0" />
+        <STATE NAME="READ_ONLY" TYPE="boolean" VALUE="false" />
+        <STATE NAME="NAME" TYPE="string" VALUE="E3" />
+    </BASIC_INFO>
+</FILE_INFO>

02-Easy3/E3.rep/idata/~index.bak

@@ -0,0 +1,5 @@
+VERSION=1
+/
+  00000000:E3:a2e40c5a09540945517759134
+NEXT-ID:1
+MD5:d41d8cd98f00b204e9800998ecf8427e

02-Easy3/E3.rep/idata/~index.dat

@@ -0,0 +1,5 @@
+VERSION=1
+/
+  00000000:E3:a2e40c5a09540945517759134
+NEXT-ID:1
+MD5:d41d8cd98f00b204e9800998ecf8427e

02-Easy3/E3.rep/project.prp

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<FILE_INFO>
+    <BASIC_INFO>
+        <STATE NAME="OWNER" TYPE="string" VALUE="remi" />
+    </BASIC_INFO>
+</FILE_INFO>

02-Easy3/E3.rep/projectState

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<PROJECT>
+    <PROJECT_DATA_XML_NAME NAME="DISPLAY_DATA">
+        <SAVE_STATE>
+            <ARRAY NAME="EXPANDED_PATHS" TYPE="string">
+                <A VALUE="E3:" />
+            </ARRAY>
+            <STATE NAME="SHOW_TABLE" TYPE="boolean" VALUE="false" />
+        </SAVE_STATE>
+    </PROJECT_DATA_XML_NAME>
+    <TOOL_MANAGER ACTIVE_WORKSPACE="Workspace">
+        <WORKSPACE NAME="Workspace" ACTIVE="true" />
+    </TOOL_MANAGER>
+</PROJECT>
+

02-Easy3/E3.rep/user/00/00000000.prp

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<FILE_INFO>
+    <BASIC_INFO>
+        <STATE NAME="CONTENT_TYPE" TYPE="string" VALUE="ProgramUserData" />
+        <STATE NAME="PARENT" TYPE="string" VALUE="/" />
+        <STATE NAME="FILE_ID" TYPE="string" VALUE="c0a82ee89d758705805429400" />
+        <STATE NAME="FILE_TYPE" TYPE="int" VALUE="0" />
+        <STATE NAME="READ_ONLY" TYPE="boolean" VALUE="false" />
+        <STATE NAME="NAME" TYPE="string" VALUE="udf_a2e40c5a09540945517759134" />
+    </BASIC_INFO>
+</FILE_INFO>

02-Easy3/E3.rep/user/~index.bak

@@ -0,0 +1,4 @@
+VERSION=1
+/
+NEXT-ID:0
+MD5:d41d8cd98f00b204e9800998ecf8427e

02-Easy3/E3.rep/user/~index.dat

@@ -0,0 +1,5 @@
+VERSION=1
+/
+  00000000:udf_a2e40c5a09540945517759134:c0a82ee89d758705805429400
+NEXT-ID:1
+MD5:d41d8cd98f00b204e9800998ecf8427e

02-Easy3/E3.rep/user/~journal.bak

@@ -0,0 +1,2 @@
+IADD:00000000:/udf_a2e40c5a09540945517759134
+IDSET:/udf_a2e40c5a09540945517759134:c0a82ee89d758705805429400

02-Easy3/E3.rep/versioned/~index.bak

@@ -0,0 +1,4 @@
+VERSION=1
+/
+NEXT-ID:0
+MD5:d41d8cd98f00b204e9800998ecf8427e

02-Easy3/E3.rep/versioned/~index.dat

@@ -0,0 +1,4 @@
+VERSION=1
+/
+NEXT-ID:0
+MD5:d41d8cd98f00b204e9800998ecf8427e

02-Easy3/E3.txt

@@ -0,0 +1,110 @@
+1. What is the target platform of this executable?
+ARM64
+
+2. Was this executable stripped?
+yes
+
+3. What is the algorithm used to check the validity of a password?
+A sum
+
+4. Can you break this password checker, i.e., implementing a generator of valid passwords? You must send 16 different valid passwords by email to pascal+sre25@mod-p.ch before Mar. 10th, 2025, 12h00 CET to validate this lab and get 5 points.
+remiPGRz2oEt
+remikljzAME/
+remiYOxms6U2
+remi0eFRgAsu
+remimvApt0L9
+remisnB2BbvN
+remi2KTkcZvN
+remi+SUFTsrk
+remiRfREU/pz
+remilVPBPu5o
+remiHRP0Bsww
+remi8MhIHsak
+remiH9zy7NxL
+remigMB24ytt
+remiY+9atQeu
+remiEtFt+lIj
+remi+R2Lniry
+remiwUUJOgd8
+remiac+ZdwDU
+remiSXlJGapD
+remiIl7m2xBx
+remiEU+jWtUn
+remiaxC+vdk1
+remiHiSw7Bbg
+remilkOGhVOC
+remi0gaHUWzW
+remi8TwmiD4l
+remiNaewP4u9
+remiym1yGVJF
+remiOgHlqnB2
+remitImS5o8d
+remi8LoMz9df
+remiNOHgblLW
+remiAfqSJzFH
+remidpDk9COo
+remihkNOV8pO
+remiAu84iiah
+remi5VGexqVG
+remiTkZCq9uB
+remiuLCxf7KY
+remikfKzVV+P
+remiXWLR1Xox
+remiyZEGxL9a
+remiYIylFB5y
+remijGqFed9S
+remidQBkrcV0
+remiuwrG5GIS
+remic/C0wrVy
+remi2yPCGpag
+remiYjgOhdG1
+remi/Hi2gVtz
+remiX8Ebrrl6
+remi/kzJPaAm
+remiT1OShoKt
+remiiqIX2RtJ
+remisDGFQyAn
+remiZhbYBFUc
+remirboCaPO7
+remiXxhCuLR/
+remiwZ93maz8
+remiQg2N5gxq
+remiZ1bg5dwY
+remiJrg9kFy7
+remiFsWCSSMw
+remi5U1vzkBe
+remid2eZweX4
+remiVLx+JsdW
+remi9hEyHu6k
+remiByJ9AkzY
+remiB27epxnW
+remi6VpV8puN
+remiPACuhfCc
+remicv9OPBXr
+remie10Odvlb
+remi1x0UemzC
+remigEZl+ksB
+remiuLbX0bBn
+remiPPu2GJmx
+remiz5DCyd7s
+remi0otpk2NO
+remiXA5ZhMms
+remix+/QkrUh
+remigZaFyW+Z
+remiaq+xXLcA
+remilSn6AUVn
+remigz8tO4Kb
+remiblkTOX0Y
+remiEeXzs2i3
+remiVtkmnA75
+remiMN0XipuL
+remiiMJE7lfo
+remiFQ4cpzq4
+remiZJG+Ykzi
+remiQTSe6qRg
+remi/WcGuyJU
+remi77NvCekx
+remiHZV2szXN
+remiLCRr7tTk
+remitgnFQNLC
+remiZYpUKKgH

02-Easy3/code.c

@@ -0,0 +1,55 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <string.h>
+#include <sys/types.h>
+
+
+char sum_pw(char *param_1) {
+  return param_1[11] +
+         param_1[10] +
+         param_1[9] +
+         param_1[8] +
+         param_1[7] +
+         param_1[6] +
+         param_1[5] +
+         param_1[4] +
+         param_1[3] +
+         param_1[2] +
+         param_1[1] +
+         param_1[0];
+}
+
+
+
+uint64_t main(int param_1,char* *param_2) {
+  char cVar1;
+  uint64_t ret;
+  size_t pw_length;
+
+  if (param_1 == 2) {
+    pw_length = strlen((char *)param_2[1]);
+    if (pw_length == 12) {
+      cVar1 = sum_pw(param_2[1]);
+      if (cVar1 == 'j') {
+        fprintf(stderr,"\nCongratulations ! A right password is indeed %s :-)\n\n",param_2[1]);
+        ret = 0;
+      }
+      else {
+        fwrite("\nWrong password ! Try again...\n\n",1,0x20,stderr);
+        ret = 1;
+      }
+    }
+    else {
+      fwrite("\nWrong password ! Try again...\n\n",1,0x20,stderr);
+      ret = 1;
+    }
+  }
+  else {
+    fwrite("\nMSE-SRE Challenge E3 --- Enjoy !\n",1,0x22,stderr);
+    fwrite("\nWhat I need is 1024 passwords passing the check!\n",1,0x32,stderr);
+    fprintf(stderr,"\nUsage: %s <password>\n\n",*param_2);
+    ret = 1;
+  }
+  return ret;
+}

02-Easy3/genKey.c

@@ -0,0 +1,82 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <time.h>
+
+const uint16_t NBR_PASSWORDS_REQUESTED = 100;
+const char TARGET = 'j';
+
+const char list[] = {
+    'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+    'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
+    '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
+    '/', '+'
+};
+char give_char(uint8_t index){
+    if (index >= sizeof(list)) {
+        printf("Error: Index out of bounds, max %zu\n", sizeof(list));
+        exit(1);
+    }
+    return list[index];
+}
+
+char sum_pw(char *pw) {
+  return pw[11] +
+  pw[10] +
+  pw[9] +
+  pw[8] +
+  pw[7] +
+  pw[6] +
+  pw[5] +
+  pw[4] +
+  pw[3] +
+  pw[2] +
+  pw[1] +
+  pw[0];
+}
+
+int main(int argc, char *argv[]) {
+    srand(time(NULL));
+
+    char password[13];
+    const uint8_t max_char = sizeof(list);
+
+    password[0] = 'r';
+    password[1] = 'e';
+    password[2] = 'm';
+    password[3] = 'i';
+
+    for(uint16_t n = 0; n < NBR_PASSWORDS_REQUESTED; n++) {
+        password[4] = give_char(rand() % max_char);
+        password[5] = give_char(rand() % max_char);
+        password[6] = give_char(rand() % max_char);
+        password[7] = give_char(rand() % max_char);
+        password[8] = give_char(rand() % max_char);
+        uint16_t i = 0;
+        do {
+            password[9] = give_char(rand() % max_char);
+            password[10] = give_char(rand() % max_char);
+            password[11] = give_char(rand() % max_char);
+            if(i++ > 1000){
+                password[4] = give_char(rand() % max_char);
+                password[5] = give_char(rand() % max_char);
+                password[6] = give_char(rand() % max_char);
+                password[7] = give_char(rand() % max_char);
+                password[8] = give_char(rand() % max_char);
+                i = 0;
+            }
+
+        } while (sum_pw(password) != TARGET);
+
+        password[12] = '\0';
+        if (sum_pw(password) == TARGET) {
+            printf("%s\n", password);
+        } else {
+            printf("Fuck\n");
+        }
+
+    }
+    return 0;
+}

02-Easy4/E4.txt

@@ -0,0 +1,26 @@
+1. Was this executable stripped?
+yes
+
+2. How are the password checking functionalities entangled with the operating system?
+
+
+3. What is the algorithm used to check the validity of a password?
+
+
+4. Can you break this password checker, i.e., implementing a generator of valid passwords? You must send 16 different valid passwords by email to pascal+sre25@mod-p.ch before Mar. 24th, 2025, 12h00 CET to validate this lab and get 5 points.
+3A3A3A3A3A3A
+3A4B5C6D7E8F
+SaSaSaSaSaSa
+SaTbUcVdWeXf
++9+9+9+9+9+9
++99GGUUccq4B
+!//==KKYYggu
+>L3AGUES3AN\
+HVESDRHVESDR
+8F7E6D5C4B3A
+XfWeVdUcTbSa
+4BcqUcGU9G+9
+guYgKY=K/=!/
+N\3AESGU3A>L
+DRESHVDRESHV
+#1HVESLZP^#1

02-Easy4/code.c

@@ -0,0 +1,61 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <string.h>
+#include <sys/types.h>
+#include <signal.h>
+
+static char* input_pw;
+static char return_check_pw;
+
+
+
+void check_pw(void) {
+  uint8_t bVar1;
+  char *pcVar2;
+  char *pcVar3;
+
+  bVar1 = 0;
+  pcVar2 = input_pw;
+  do {
+    pcVar3 = pcVar2 + 2;
+    bVar1 = bVar1 | ((pcVar2[1] - 14) - pcVar2[0]);
+    pcVar2 = pcVar3;
+  } while (input_pw + 12 != pcVar3);
+  return_check_pw = (int)(char)bVar1;
+  return;
+}
+
+void print_check_pw(void) {
+  if (return_check_pw != 0) {
+    fwrite("\nWrong password ! Try again...\n\n",1,0x20,stderr);
+    return;
+  }
+  fprintf(stderr,"\nCongratulations ! A right password is indeed %s :-)\n\n",input_pw);
+  return;
+}
+
+
+uint64_t main(int param_1,char* *param_2) {
+  char *__s;
+  size_t sVar1;
+
+  if (param_1 == 2) {
+    __s = (char *)param_2[1];
+    sVar1 = strlen(__s);
+    if (sVar1 == 12) {
+      input_pw = __s;
+      signal(10,check_pw);
+      signal(12,print_check_pw);
+      kill(0,10);
+      kill(0,12);
+      return 0;
+    }
+    fwrite("\nWrong password ! Try again...\n\n",1,0x20,stderr);
+  } else {
+    fwrite("\nMSE-SRE Challenge E4 --- Enjoy !\n",1,0x22,stderr);
+    fwrite("\nWhat I need is 1024 passwords passing the check!\n",1,0x32,stderr);
+    fprintf(stderr,"\nUsage: %s <password>\n\n",*param_2);
+  }
+  return 1;
+}

02-Easy5/E5.apk.jadx

@@ -0,0 +1,224 @@
+{
+  "projectVersion": 1,
+  "files": [
+    "E5.apk"
+  ],
+  "treeExpansions": [
+    [
+      "Files",
+      "Inputs",
+      "E5.apk"
+    ],
+    [
+      "Source code",
+      "E5.apk"
+    ],
+    [
+      "ch.mod_p.sre24.e5",
+      "Source code",
+      "E5.apk"
+    ],
+    [
+      "data",
+      "ch.mod_p.sre24.e5",
+      "Source code",
+      "E5.apk"
+    ],
+    [
+      "databinding",
+      "ch.mod_p.sre24.e5",
+      "Source code",
+      "E5.apk"
+    ],
+    [
+      "ui.login",
+      "ch.mod_p.sre24.e5",
+      "Source code",
+      "E5.apk"
+    ],
+    [
+      "model",
+      "data",
+      "ch.mod_p.sre24.e5",
+      "Source code",
+      "E5.apk"
+    ],
+    [
+      "ch.mod_p.sre24.e5.data.Result",
+      "data",
+      "ch.mod_p.sre24.e5",
+      "Source code",
+      "E5.apk"
+    ],
+    [
+      "ch.mod_p.sre24.e5.data.model.LoggedInUser",
+      "model",
+      "data",
+      "ch.mod_p.sre24.e5",
+      "Source code",
+      "E5.apk"
+    ],
+    [
+      "ch.mod_p.sre24.e5.R",
+      "ch.mod_p.sre24.e5",
+      "Source code",
+      "E5.apk"
+    ],
+    [
+      "ch.mod_p.sre24.e5.R.string",
+      "ch.mod_p.sre24.e5.R",
+      "ch.mod_p.sre24.e5",
+      "Source code",
+      "E5.apk"
+    ],
+    [
+      "ch.mod_p.sre24.e5.data.LoginDataSource",
+      "data",
+      "ch.mod_p.sre24.e5",
+      "Source code",
+      "E5.apk"
+    ],
+    [
+      "Resources",
+      "E5.apk"
+    ],
+    [
+      "res",
+      "Resources",
+      "E5.apk"
+    ],
+    [
+      "resources.arsc",
+      "Resources",
+      "E5.apk"
+    ],
+    [
+      "assets",
+      "Resources",
+      "E5.apk"
+    ],
+    [
+      "dexopt",
+      "assets",
+      "Resources",
+      "E5.apk"
+    ],
+    [
+      "kotlin",
+      "Resources",
+      "E5.apk"
+    ],
+    [
+      "META-INF",
+      "Resources",
+      "E5.apk"
+    ],
+    [
+      "res",
+      "resources.arsc",
+      "Resources",
+      "E5.apk"
+    ],
+    [
+      "values",
+      "res",
+      "resources.arsc",
+      "Resources",
+      "E5.apk"
+    ]
+  ],
+  "codeData": {
+    "comments": [],
+    "renames": []
+  },
+  "openTabs": [
+    {
+      "type": "class",
+      "tabPath": "ch.mod_p.sre24.e5.data.model.LoggedInUser",
+      "subPath": "java",
+      "caret": 161,
+      "view": {
+        "x": 0,
+        "y": 0
+      },
+      "active": false,
+      "pinned": false,
+      "bookmarked": false,
+      "hidden": false
+    },
+    {
+      "type": "class",
+      "tabPath": "ch.mod_p.sre24.e5.data.LoginDataSource",
+      "subPath": "java",
+      "caret": 363,
+      "view": {
+        "x": 0,
+        "y": 0
+      },
+      "active": true,
+      "pinned": false,
+      "bookmarked": false,
+      "hidden": false
+    },
+    {
+      "type": "class",
+      "tabPath": "ch.mod_p.sre24.e5.R",
+      "subPath": "java",
+      "caret": 280334,
+      "view": {
+        "x": 0,
+        "y": 129469
+      },
+      "active": false,
+      "pinned": false,
+      "bookmarked": false,
+      "hidden": false
+    },
+    {
+      "type": "class",
+      "tabPath": "ch.mod_p.sre24.e5.data.Result",
+      "subPath": "java",
+      "caret": 471,
+      "view": {
+        "x": 0,
+        "y": 0
+      },
+      "active": false,
+      "pinned": false,
+      "bookmarked": false,
+      "hidden": false
+    },
+    {
+      "type": "class",
+      "tabPath": "ch.mod_p.sre24.e5.data.LoginRepository",
+      "subPath": "java",
+      "caret": 1091,
+      "view": {
+        "x": 0,
+        "y": 0
+      },
+      "active": false,
+      "pinned": false,
+      "bookmarked": false,
+      "hidden": false
+    },
+    {
+      "type": "resource",
+      "tabPath": "res/values/strings.xml",
+      "subPath": "",
+      "caret": 12643,
+      "view": {
+        "x": 0,
+        "y": 2224
+      },
+      "active": false,
+      "pinned": false,
+      "bookmarked": false,
+      "hidden": false
+    }
+  ],
+  "cacheDir": "/home/remi/.cache/jadx/projects/E5-ae11e035339100e020829e310de005fa",
+  "enableLiveReload": false,
+  "searchHistory": [],
+  "pluginOptions": {}
+}

02-Easy5/E5.txt

@@ -0,0 +1,9 @@
+1. What programming languages are used to make this Android app?
+
+2. What platforms does this Android app support?
+
+3. What is the username and password verification process?
+
+
+4. To validate this lab and get 5 points, you must send the valid combination of username and password by email to pascal+sre25@mod-p.ch before Apr. 7th, 2025, 12h00 CET.
+user_14@evil.com - O89J7WXEY+HG

02-Easy5/E5/resources/AndroidManifest.xml

@@ -0,0 +1,69 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    android:versionCode="1"
+    android:versionName="1.0"
+    android:compileSdkVersion="34"
+    android:compileSdkVersionCodename="14"
+    package="ch.mod_p.sre24.e5"
+    platformBuildVersionCode="34"
+    platformBuildVersionName="14">
+    <uses-sdk
+        android:minSdkVersion="21"
+        android:targetSdkVersion="34"/>
+    <permission
+        android:name="ch.mod_p.sre24.e5.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION"
+        android:protectionLevel="signature"/>
+    <uses-permission android:name="ch.mod_p.sre24.e5.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION"/>
+    <application
+        android:theme="@style/Theme.E5"
+        android:label="@string/app_name"
+        android:icon="@mipmap/ic_launcher"
+        android:allowBackup="true"
+        android:supportsRtl="true"
+        android:extractNativeLibs="true"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:appComponentFactory="androidx.core.app.CoreComponentFactory">
+        <activity
+            android:label="@string/title_activity_login"
+            android:name="ch.mod_p.sre24.e5.ui.login.LoginActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+        </activity>
+        <provider
+            android:name="androidx.startup.InitializationProvider"
+            android:exported="false"
+            android:authorities="ch.mod_p.sre24.e5.androidx-startup">
+            <meta-data
+                android:name="androidx.emoji2.text.EmojiCompatInitializer"
+                android:value="androidx.startup"/>
+            <meta-data
+                android:name="androidx.lifecycle.ProcessLifecycleInitializer"
+                android:value="androidx.startup"/>
+            <meta-data
+                android:name="androidx.profileinstaller.ProfileInstallerInitializer"
+                android:value="androidx.startup"/>
+        </provider>
+        <receiver
+            android:name="androidx.profileinstaller.ProfileInstallReceiver"
+            android:permission="android.permission.DUMP"
+            android:enabled="true"
+            android:exported="true"
+            android:directBootAware="false">
+            <intent-filter>
+                <action android:name="androidx.profileinstaller.action.INSTALL_PROFILE"/>
+            </intent-filter>
+            <intent-filter>
+                <action android:name="androidx.profileinstaller.action.SKIP_FILE"/>
+            </intent-filter>
+            <intent-filter>
+                <action android:name="androidx.profileinstaller.action.SAVE_PROFILE"/>
+            </intent-filter>
+            <intent-filter>
+                <action android:name="androidx.profileinstaller.action.BENCHMARK_OPERATION"/>
+            </intent-filter>
+        </receiver>
+    </application>
+</manifest>

02-Easy5/E5/resources/META-INF/androidx.activity_activity.version

@@ -0,0 +1 @@
+1.8.0

02-Easy5/E5/resources/META-INF/androidx.annotation_annotation-experimental.version

@@ -0,0 +1 @@
+1.3.0

02-Easy5/E5/resources/META-INF/androidx.appcompat_appcompat-resources.version

@@ -0,0 +1 @@
+1.6.1

02-Easy5/E5/resources/META-INF/androidx.appcompat_appcompat.version

@@ -0,0 +1 @@
+1.6.1

02-Easy5/E5/resources/META-INF/androidx.arch.core_core-runtime.version

@@ -0,0 +1 @@
+task ':arch:core:core-runtime:writeVersionFile' property 'version'

02-Easy5/E5/resources/META-INF/androidx.cardview_cardview.version

@@ -0,0 +1 @@
+1.0.0

02-Easy5/E5/resources/META-INF/androidx.coordinatorlayout_coordinatorlayout.version

@@ -0,0 +1 @@
+1.1.0

02-Easy5/E5/resources/META-INF/androidx.core_core-ktx.version

@@ -0,0 +1 @@
+1.9.0

02-Easy5/E5/resources/META-INF/androidx.core_core.version

@@ -0,0 +1 @@
+1.9.0

02-Easy5/E5/resources/META-INF/androidx.cursoradapter_cursoradapter.version

@@ -0,0 +1 @@
+1.0.0

02-Easy5/E5/resources/META-INF/androidx.customview_customview.version

@@ -0,0 +1 @@
+1.1.0

02-Easy5/E5/resources/META-INF/androidx.databinding_viewbinding.version

@@ -0,0 +1 @@
+8.2.2

02-Easy5/E5/resources/META-INF/androidx.documentfile_documentfile.version

@@ -0,0 +1 @@
+1.0.0

02-Easy5/E5/resources/META-INF/androidx.drawerlayout_drawerlayout.version

@@ -0,0 +1 @@
+1.1.1

02-Easy5/E5/resources/META-INF/androidx.dynamicanimation_dynamicanimation.version

@@ -0,0 +1 @@
+1.0.0

02-Easy5/E5/resources/META-INF/androidx.emoji2_emoji2-views-helper.version

@@ -0,0 +1 @@
+1.2.0

02-Easy5/E5/resources/META-INF/androidx.emoji2_emoji2.version

@@ -0,0 +1 @@
+1.2.0

02-Easy5/E5/resources/META-INF/androidx.fragment_fragment.version

@@ -0,0 +1 @@
+1.3.6

02-Easy5/E5/resources/META-INF/androidx.interpolator_interpolator.version

@@ -0,0 +1 @@
+1.0.0

02-Easy5/E5/resources/META-INF/androidx.legacy_legacy-support-core-utils.version

@@ -0,0 +1 @@
+1.0.0

02-Easy5/E5/resources/META-INF/androidx.lifecycle_lifecycle-livedata-core-ktx.version

@@ -0,0 +1 @@
+2.7.0

02-Easy5/E5/resources/META-INF/androidx.lifecycle_lifecycle-livedata-core.version

@@ -0,0 +1 @@
+2.7.0

02-Easy5/E5/resources/META-INF/androidx.lifecycle_lifecycle-livedata-ktx.version

@@ -0,0 +1 @@
+2.7.0

02-Easy5/E5/resources/META-INF/androidx.lifecycle_lifecycle-livedata.version

@@ -0,0 +1 @@
+2.7.0

02-Easy5/E5/resources/META-INF/androidx.lifecycle_lifecycle-process.version

@@ -0,0 +1 @@
+2.7.0

02-Easy5/E5/resources/META-INF/androidx.lifecycle_lifecycle-runtime.version

@@ -0,0 +1 @@
+2.7.0

02-Easy5/E5/resources/META-INF/androidx.lifecycle_lifecycle-viewmodel-ktx.version

@@ -0,0 +1 @@
+2.7.0

02-Easy5/E5/resources/META-INF/androidx.lifecycle_lifecycle-viewmodel-savedstate.version

@@ -0,0 +1 @@
+2.7.0

02-Easy5/E5/resources/META-INF/androidx.lifecycle_lifecycle-viewmodel.version

@@ -0,0 +1 @@
+2.7.0

02-Easy5/E5/resources/META-INF/androidx.loader_loader.version

@@ -0,0 +1 @@
+1.0.0

02-Easy5/E5/resources/META-INF/androidx.localbroadcastmanager_localbroadcastmanager.version

@@ -0,0 +1 @@
+1.0.0

02-Easy5/E5/resources/META-INF/androidx.print_print.version

@@ -0,0 +1 @@
+1.0.0

02-Easy5/E5/resources/META-INF/androidx.profileinstaller_profileinstaller.version

@@ -0,0 +1 @@
+1.3.0

02-Easy5/E5/resources/META-INF/androidx.recyclerview_recyclerview.version

@@ -0,0 +1 @@
+1.1.0

02-Easy5/E5/resources/META-INF/androidx.savedstate_savedstate.version

@@ -0,0 +1 @@
+1.2.1

02-Easy5/E5/resources/META-INF/androidx.startup_startup-runtime.version

@@ -0,0 +1 @@
+1.1.1

02-Easy5/E5/resources/META-INF/androidx.tracing_tracing.version

@@ -0,0 +1 @@
+1.0.0

02-Easy5/E5/resources/META-INF/androidx.transition_transition.version

@@ -0,0 +1 @@
+1.2.0

02-Easy5/E5/resources/META-INF/androidx.vectordrawable_vectordrawable-animated.version

@@ -0,0 +1 @@
+1.1.0

02-Easy5/E5/resources/META-INF/androidx.vectordrawable_vectordrawable.version

@@ -0,0 +1 @@
+1.1.0

02-Easy5/E5/resources/META-INF/androidx.versionedparcelable_versionedparcelable.version

@@ -0,0 +1 @@
+1.1.1

02-Easy5/E5/resources/META-INF/androidx.viewpager2_viewpager2.version

@@ -0,0 +1 @@
+1.0.0

02-Easy5/E5/resources/META-INF/androidx.viewpager_viewpager.version

@@ -0,0 +1 @@
+1.0.0

02-Easy5/E5/resources/META-INF/com.google.android.material_material.version

@@ -0,0 +1 @@
+1.11.0

02-Easy5/E5/resources/META-INF/com/android/build/gradle/app-metadata.properties

@@ -0,0 +1,2 @@
+appMetadataVersion=1.1
+androidGradlePluginVersion=8.2.2

02-Easy5/E5/resources/META-INF/kotlinx_coroutines_android.version

@@ -0,0 +1 @@
+1.7.1

02-Easy5/E5/resources/META-INF/kotlinx_coroutines_core.version

@@ -0,0 +1 @@
+1.7.1

02-Easy5/E5/resources/META-INF/services/kotlinx.coroutines.CoroutineExceptionHandler

@@ -0,0 +1 @@
+kotlinx.coroutines.android.AndroidExceptionPreHandler

02-Easy5/E5/resources/META-INF/services/kotlinx.coroutines.internal.MainDispatcherFactory

@@ -0,0 +1 @@
+kotlinx.coroutines.android.AndroidDispatcherFactory