sas2026/vm
3
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

fix: make printed messages clearer

Browse Source
This commit is contained in:
Michael
2026-05-14 19:33:25 +02:00
parent 9dcb7d3b13
commit 54600f6c00
1 changed files with 12 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files

28
src/main.c
View File

@@ -13,7 +13,7 @@
#include <string.h> #include <string.h>
#include <stdlib.h> #include <stdlib.h>
#define MESSAGE_UNAUTHORIZED "You are not authorized to use this software!\n"
#define MAX_STEPS 1024u #define MAX_STEPS 1024u
@@ -32,9 +32,9 @@ int main(){
return 1; return 1;
} }
fprintf(stderr, "HWINFO: %s\n", hw_info_flatten(hwinfo)); // fprintf(stderr, "HWINFO: %s\n", hw_info_flatten(hwinfo));
fprintf(stderr, "Key: "); fprintf(stderr, "[Info] Unique hardware key: ");
for (int i = 0; i < 16; i++) for (int i = 0; i < 16; i++)
fprintf(stderr, "%02X", key[i]); fprintf(stderr, "%02X", key[i]);
fprintf(stderr, "\n"); fprintf(stderr, "\n");
@@ -53,7 +53,7 @@ int main(){
} }
if (license == NULL) { if (license == NULL) {
fprintf(stderr, "Could not find license file\n"); fprintf(stderr, "[Error] Could not find license file\n");
return 1; return 1;
} }
@@ -66,10 +66,6 @@ int main(){
fread(buf, 1, license_size, license); fread(buf, 1, license_size, license);
// void AES_init_ctx(struct AES_ctx* ctx, const uint8_t* key);
// void AES_init_ctx_iv(struct AES_ctx* ctx, const uint8_t* key, const uint8_t* iv);
// void AES_CTR_xcrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, size_t length);
AES_init_ctx(&ctx, key); AES_init_ctx(&ctx, key);
AES_init_ctx_iv(&ctx, key, nonce); AES_init_ctx_iv(&ctx, key, nonce);
AES_CTR_xcrypt_buffer(&ctx, buf, license_size); AES_CTR_xcrypt_buffer(&ctx, buf, license_size);
@@ -83,12 +79,12 @@ int main(){
fread(begin, 1, sizeof(begin), decrypted_license); fread(begin, 1, sizeof(begin), decrypted_license);
if(memcmp(begin, expected, sizeof(begin)) != 0) { if(memcmp(begin, expected, sizeof(begin)) != 0) {
// This happens when decryption fails // This happens when decryption fails
printf("You are not authorized to use this software!\n"); printf(MESSAGE_UNAUTHORIZED);
return 1; return 1;
} }
const int maxninput = 255; const int maxninput = 255;
printf("Please enter the flag: "); printf("Please enter your authorization code: ");
fflush(stdout); fflush(stdout);
char userinput[maxninput]; char userinput[maxninput];
fgets(userinput, sizeof(userinput), stdin); fgets(userinput, sizeof(userinput), stdin);
@@ -110,9 +106,9 @@ int main(){
// Load elf, keep 512 bytes as safe buffer // Load elf, keep 512 bytes as safe buffer
int load_status = load_elf_object_sections(decrypted_license, memory, cpu.mem_size - SIZE_USERDATA); int load_status = load_elf_object_sections(decrypted_license, memory, cpu.mem_size - SIZE_USERDATA);
if (load_status != LOAD_OK) { if (load_status != LOAD_OK) {
fprintf(stderr, "ELF load failed with code %d for decrypted license\n", load_status); fprintf(stderr, "[Error] ELF load failed with code %d for decrypted license\n", load_status);
fflush(stderr); fflush(stderr);
printf("ELF load failed with code %d\n", load_status); printf("[Error] ELF load failed with code %d\n", load_status);
fflush(stdout); fflush(stdout);
return 1; return 1;
} }
@@ -121,7 +117,7 @@ int main(){
int symbol_status = resolve_elf_symbol_memory_offset( int symbol_status = resolve_elf_symbol_memory_offset(
decrypted_license, EMU_ENTRY_SYMBOL, cpu.mem_size, &entry_offset); decrypted_license, EMU_ENTRY_SYMBOL, cpu.mem_size, &entry_offset);
if (symbol_status != LOAD_OK) { if (symbol_status != LOAD_OK) {
fprintf(stderr, "Entry symbol '%s' resolve failed with code %d\n", fprintf(stderr, "[Error] Entry symbol '%s' resolve failed with code %d\n",
EMU_ENTRY_SYMBOL, symbol_status); EMU_ENTRY_SYMBOL, symbol_status);
return 2; return 2;
} }
@@ -139,16 +135,16 @@ int main(){
} }
if (steps == MAX_STEPS) { if (steps == MAX_STEPS) {
fprintf(stderr, "Execution did not halt within %u steps\n", MAX_STEPS); fprintf(stderr, "[Error] Execution did not halt within %u steps\n", MAX_STEPS);
return 2; return 2;
} }
uint32_t result = (uint32_t)cpu.x[10]; uint32_t result = (uint32_t)cpu.x[10];
if(result == 1) { if(result == 1) {
printf("Congrats! That's the flag!\n"); printf("License activated successfully!\n");
} else { } else {
printf("Nope, sorry, that's incorrect!\n"); printf(MESSAGE_UNAUTHORIZED);
} }
return 0; return 0;