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Proper title key decryption but with horrible code

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I don't care that I have duplicate code and stuff that I'm not using. I just want to commit a working version because this took me a whole fucking day.
This commit is contained in:
rmc 2024-03-31 01:02:35 -04:00
parent 5eab2d4e77
commit 7c767e5bcf
No known key found for this signature in database
GPG Key ID: 5633EC10309D77D1
1 changed files with 58 additions and 7 deletions
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65
arm9/src/tad.c
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@ -76,22 +76,22 @@ uint32_t round_up( const u32 v, const u32 align )
https://problemkaputt.de/gbatek.htm#dscartridgeheader
https://gist.github.com/rvtr/f1069530129b7a57967e3fc4b30866b4#file-decrypt_tad-py-L84
*/
void decrypt_title_key(const unsigned char* key, unsigned char* iv, const unsigned char* encryptedData, size_t dataSize, unsigned char* decryptedData) {
void decrypt_title_key(const unsigned char* key, unsigned char* iv, const unsigned char* encryptedData, size_t dataSize, size_t keySize, unsigned char* decryptedData) {
aes_context ctx;
unsigned char decryptedBlock[16];
/* ============================================= */
iprintf(" Dev common key...\n");
for (int i = 0; i < sizeof(key); i++) {
for (int i = 0; i < keySize; i++) {
iprintf("%02X", key[i]);
}
iprintf("\n");
iprintf(" Title key IV...\n");
for (int i = 0; i < sizeof(iv); i++) {
for (int i = 0; i < 16; i++) {
iprintf("%02X", iv[i]);
}
iprintf("\n");
iprintf(" Enc title key...\n");
for (int i = 0; i < sizeof(encryptedData); i++) {
for (int i = 0; i < dataSize; i++) {
iprintf("%02X", encryptedData[i]);
}
iprintf("\n");
@ -100,11 +100,60 @@ void decrypt_title_key(const unsigned char* key, unsigned char* iv, const unsign
iprintf("\n");
/* ============================================= */
aes_setkey_dec(&ctx, key, 256);
aes_crypt_cbc(&ctx, AES_DECRYPT, dataSize, iv, encryptedData, decryptedBlock);
aes_crypt_cbc(&ctx, AES_DECRYPT, 16, iv, encryptedData, decryptedBlock);
memcpy(decryptedData, decryptedBlock, dataSize);
printf(" Title key decrypted!\n");
for (int i = 0; i < sizeof(decryptedBlock); i++) {
printf("%02X", decryptedBlock[i]);
}
printf("\n");
}
int testroutine() {
const unsigned char iv[16] = {
0x00, 0x03, 0x00, 0x17, 0x48, 0x4E, 0x41, 0x41,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
const unsigned char key[16] = {
0xA1, 0x60, 0x4A, 0x6A, 0x71, 0x23, 0xB5, 0x29,
0xAE, 0x8B, 0xEC, 0x32, 0xC8, 0x16, 0xFC, 0xAA
};
const unsigned char encryptedData[16] = {
0x9D, 0x89, 0x45, 0xB6, 0x12, 0xE9, 0xC1, 0x90,
0x48, 0x7C, 0x7A, 0x52, 0xED, 0x83, 0xED, 0xEF
};
unsigned char decryptedData[16];
aes_context ctx;
unsigned char decryptedBlock[16];
aes_setkey_dec(&ctx, key, 128);
aes_crypt_cbc(&ctx, AES_DECRYPT, sizeof(encryptedData), iv, encryptedData, decryptedBlock);
memcpy(decryptedData, decryptedBlock, sizeof(encryptedData));
printf("Decrypted Data: ");
for (int i = 0; i < sizeof(decryptedData); i++) {
printf("%02X", decryptedData[i]);
}
printf("\n");
printf("Decrypted Data: ");
for (int i = 0; i < sizeof(decryptedBlock); i++) {
printf("%02X", decryptedBlock[i]);
}
printf("\n");
return 0;
}
int decryptTad(char const* src)
{
if (!src) return 1;
@ -249,7 +298,7 @@ int decryptTad(char const* src)
FILE *ticket = fopen("sd:/_nds/tadtests/ticket.bin", "rb");
unsigned char title_key_enc[16];
fseek(ticket, 447, SEEK_SET);
fread(title_key_enc, 1, 8, ticket);
fread(title_key_enc, 1, 16, ticket);
iprintf(" Title key found!\n");
for (int i = 0; i < 16; i++) {
iprintf("%02X", title_key_enc[i]);
@ -277,13 +326,15 @@ int decryptTad(char const* src)
printf("\n");
/* ============================================= */
unsigned char title_key_dec[16];
decrypt_title_key(devKey, title_key_iv, title_key_enc, sizeof(title_key_enc), title_key_dec);
decrypt_title_key(devKey, title_key_iv, title_key_enc, sizeof(title_key_enc), sizeof(devKey), title_key_dec);
printf(" Title key decrypted!\n");
for (int i = 0; i < sizeof(title_key_dec); i++) {
printf("%02X", title_key_dec[i]);
}
printf("\n");
testroutine();
//return copyFilePart(src, 0, size, dst);
return 0;