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Modificata data section per allinearla a 4. Pulito server.cpp e decrypt.pstc

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This commit is contained in:
Giulio De Pasquale 2017-05-29 18:20:30 +02:00
parent a0128d323b
commit 394cd5d9c6
4 changed files with 30 additions and 43 deletions
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4
polictf/asms/decrypt.pstc
View File

@ -104,8 +104,4 @@ poop s0
addi s0, 4
cmpr s0, r2
jpbi decrypt
lodi r0, 0
lodi r1, 2
lodi r2, 4
lodi r3, 6
shit

2
polictf/res/decrypteddatasection.txt
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@ -1 +1 @@
TheDataSectionHasBeenEncrypted!WhoAreYouGonnaCall?TheRuNasss!
TheDataSectionHasBeenEncrypted...WhoAreYouGonnaCall...TheRuNasOfCourse..

2
polictf/res/encrypteddatasection
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@ -1 +1 @@
Œê¾ªí Ðk™R%¹æØÿùé’zÅÄ~*ìg2E$ÐLdYí¦xþ­Ñ¼àØ:ùûùùn\RXF<58>UXE!
ŚęľŞí Đk™R%ąćŘ˙ůé’zĹÄ~*ěg2†Ę˙ř<wBă )K4gKÉź©ů ›Š[rdĺŘ\RXFď6v‡ěű]BŽ·G

53
polictf/server/pasticciotto_server.cpp
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@ -1,5 +1,5 @@
#include "../../vm/vm.h"
#include "../../vm/debug.h"
#include "../../vm/vm.h"
#include <fstream>
#include <iostream>
#include <stdint.h>
@ -8,9 +8,19 @@
#include <time.h>
#include <unistd.h>
#define KEYLEN 15
#define OPCODES_KEYLEN 15
#define CODESIZE 0x300
#define DATAKEYLEN 30
#define FLAG_LEN 30
unsigned char EN_DATASECTION[] = {
0x8c, 0xea, 0xbe, 0xaa, 0xed, 0xa0, 0xd0, 0x6b, 0x99, 0x1c, 0x52, 0x25,
0xb9, 0xe6, 0xd8, 0xff, 0xf9, 0xe9, 0x92, 0x7a, 0x1c, 0xc5, 0xc4, 0x7e,
0x2a, 0xec, 0x67, 0x32, 0x86, 0xca, 0xff, 0xf8, 0x3c, 0x1c, 0x77, 0x42,
0xe3, 0x20, 0x29, 0x4b, 0x34, 0x67, 0x4b, 0xc9, 0x9f, 0xa9, 0xf9, 0x0c,
0x0f, 0x9b, 0x8a, 0x5b, 0x72, 0x64, 0xe5, 0xd8, 0x5c, 0x52, 0x58, 0x46,
0xef, 0x36, 0x76, 0x87, 0xec, 0x1e, 0xfb, 0x5d, 0x42, 0x8e, 0xb7, 0x47};
unsigned int DATASECTIONLEN = 72;
void gen_random(uint8_t *s, const int len) {
srand(time(NULL));
@ -24,28 +34,17 @@ void gen_random(uint8_t *s, const int len) {
s[len] = 0;
}
unsigned char encrypted_data[] = {
0x8c, 0xea, 0xbe, 0xaa, 0xed, 0xa0, 0xd0, 0x6b, 0x99, 0x1c, 0x52, 0x25,
0xb9, 0xe6, 0xd8, 0xff, 0xf9, 0xe9, 0x92, 0x7a, 0x1c, 0xc5, 0xc4, 0x7e,
0x2a, 0xec, 0x67, 0x32, 0x1f, 0x45, 0x24, 0xd0, 0x4c, 0x7f, 0x15, 0x64,
0x59, 0xed, 0xa6, 0x78, 0xfe, 0xad, 0xd1, 0xbc, 0xe0, 0xd8, 0x3a, 0xf9,
0xfb, 0xf9, 0xf9, 0x6e, 0x5c, 0x52, 0x58, 0x46, 0x8d, 0x55, 0x58, 0x45,
0x21
};
unsigned int encrypted_data_len = 61;
int main(int argc, char *argv[]) {
uint8_t *key = new uint8_t[KEYLEN], *decdatasec = new uint8_t[encrypted_data_len],
*flag = new uint8_t[DATAKEYLEN];
uint8_t *opcodes_key = new uint8_t[OPCODES_KEYLEN],
*decdatasec = new uint8_t[DATASECTIONLEN],
*flag = new uint8_t[FLAG_LEN];
uint8_t *clientcode;
uint8_t i;
uint32_t clientcodesize, bytesread;
FILE *datap, *flagp;
gen_random(key, KEYLEN);
printf("Use this: \"%s\"\n", key);
fflush(stdout);
gen_random(opcodes_key, OPCODES_KEYLEN);
printf("Use this: \"%s\"\n", opcodes_key);
printf("How much data are you sending me?\n");
fflush(stdout);
scanf("%d", &clientcodesize);
@ -58,12 +57,8 @@ int main(int argc, char *argv[]) {
fflush(stdout);
exit(1);
}
VM vm(key, clientcode, clientcodesize);
vm.as.insData(encrypted_data, encrypted_data_len);
printf("BEFORE:\n");
for (i = 0; i < DATAKEYLEN; i++) {
fprintf(stdout, "buf[%d] = 0x%02x\n", i, vm.as.data[i]);
}
VM vm(opcodes_key, clientcode, clientcodesize);
vm.as.insData(EN_DATASECTION, DATASECTIONLEN);
vm.run();
datap = fopen("../res/decrypteddatasection.txt", "r");
@ -75,13 +70,9 @@ int main(int argc, char *argv[]) {
fscanf(datap, "%s", decdatasec);
fclose(datap);
for (i = 0; i < DATAKEYLEN; i++) {
fprintf(stdout, "buf[%d] = 0x%02x\n", i, vm.as.data[i]);
}
for (i = 0; i < DATAKEYLEN; i++) {
for (i = 0; i < DATASECTIONLEN; i++) {
DBG_INFO(("Checking data[%d]..\n", i));
if (vm.as.data[i] != decdatasec[i]) {
printf("Checking data[%d]..\n", i);
fflush(stdout);
printf("Nope!\n");
fflush(stdout);
exit(1);