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Full TAD extraction and decryption

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rmc 2024-04-01 21:27:36 -04:00
parent 7c767e5bcf
commit aea4371a6a
No known key found for this signature in database
GPG Key ID: 5633EC10309D77D1
1 changed files with 80 additions and 141 deletions
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223
arm9/src/tad.c
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@ -1,3 +1,10 @@
/*
A lot of this is heavily "inspired" by remaketad.pl in TwlIPL (/tools/bin/remaketad.pl)
That script was made to decrypt + unpack a dev TAD and and rebuild for SystemUpdaters.
https://github.com/rvtr/TwlIPL/blob/trunk/tools/bin/remaketad.pl
*/
#include "tad.h" #include "tad.h"
#include "storage.h" #include "storage.h"
#include "nand/twltool/dsi.h" #include "nand/twltool/dsi.h"
@ -22,9 +29,18 @@
If for whatever reason you want to make TADs, see here: If for whatever reason you want to make TADs, see here:
https://randommeaninglesscharacters.com/dsidev/man/maketad.html https://randommeaninglesscharacters.com/dsidev/man/maketad.html
*/ */
unsigned char devKey[] = {0xA1, 0x60, 0x4A, 0x6A, 0x71, 0x23, 0xB5, 0x29, 0xAE, 0x8B, 0xEC, 0x32, 0xC8, 0x16, 0xFC, 0xAA}; const unsigned char devKey[] = {
unsigned char prodKey[] = {0xAF, 0x1B, 0xF5, 0x16, 0xA8, 0x07, 0xD2, 0x1A, 0xEA, 0x45, 0x98, 0x4F, 0x04, 0x74, 0x28, 0x61}; 0xA1, 0x60, 0x4A, 0x6A, 0x71, 0x23, 0xB5, 0x29,
unsigned char debuggerKey[] = {0xA2, 0xFD, 0xDD, 0xF2 ,0xE4, 0x23, 0x57, 0x4A, 0xE7, 0xED, 0x86, 0x57, 0xB5, 0xAB, 0x19, 0xD3}; 0xAE, 0x8B, 0xEC, 0x32, 0xC8, 0x16, 0xFC, 0xAA
};
const unsigned char prodKey[] = {
0xAF, 0x1B, 0xF5, 0x16, 0xA8, 0x07, 0xD2, 0x1A,
0xEA, 0x45, 0x98, 0x4F, 0x04, 0x74, 0x28, 0x61
};
const unsigned char debuggerKey[] = {
0xA2, 0xFD, 0xDD, 0xF2 ,0xE4, 0x23, 0x57, 0x4A,
0xE7, 0xED, 0x86, 0x57, 0xB5, 0xAB, 0x19, 0xD3
};
typedef struct { typedef struct {
uint32_t hdrSize; uint32_t hdrSize;
uint16_t tadType; uint16_t tadType;
@ -61,98 +77,11 @@ uint32_t round_up( const u32 v, const u32 align )
return r; return r;
} }
/* void decrypt_cbc(const unsigned char* key, const unsigned char* iv, const unsigned char* encryptedData, size_t dataSize, size_t keySize, unsigned char* decryptedData) {
This is SRL decryption. Again, just like WADs:
Common key + title key IV to decrypt title key, title key + content IV to decrypt content
We have to try each possible common key until we find one that works. I don't know a better way to do this
(nothing in the TAD would specify the key needed) so we'll try keys in the order of which ones are more common:
DEV --> DEBUGGER --> PROD
We check for only zerobytes at 0x15-1B to see if the SRL is decrypted properly. (should always be zerobytes)
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, size_t keySize, unsigned char* decryptedData) {
aes_context ctx; aes_context ctx;
unsigned char decryptedBlock[16];
/* ============================================= */
iprintf(" Dev common key...\n");
for (int i = 0; i < keySize; i++) {
iprintf("%02X", key[i]);
}
iprintf("\n");
iprintf(" Title key IV...\n");
for (int i = 0; i < 16; i++) {
iprintf("%02X", iv[i]);
}
iprintf("\n");
iprintf(" Enc title key...\n");
for (int i = 0; i < dataSize; i++) {
iprintf("%02X", encryptedData[i]);
}
iprintf("\n");
iprintf(" Title key size...\n");
iprintf("%u", dataSize);
iprintf("\n");
/* ============================================= */
aes_setkey_dec(&ctx, key, 256);
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_setkey_dec(&ctx, key, 128);
aes_crypt_cbc(&ctx, AES_DECRYPT, sizeof(encryptedData), iv, encryptedData, decryptedBlock); aes_crypt_cbc(&ctx, AES_DECRYPT, dataSize, iv, encryptedData, decryptedData);
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) int decryptTad(char const* src)
{ {
@ -164,12 +93,7 @@ int decryptTad(char const* src)
return 1; return 1;
} }
mkdir("sd:/_nds/tadtests", 0777); mkdir("sd:/_nds/tadtests/tmp", 0777);
// A lot of this is heavily "inspired" by remaketad.pl in TwlIPL (/tools/bin/remaketad.pl)
// That script was made to decrypt + unpack a dev TAD and and rebuild for SystemUpdaters.
//
// https://github.com/rvtr/TwlIPL/blob/trunk/tools/bin/remaketad.pl
/* /*
Please excuse my terrible copy paste coding. I do not know C and I'm translating from other languages Please excuse my terrible copy paste coding. I do not know C and I'm translating from other languages
@ -201,6 +125,7 @@ int decryptTad(char const* src)
There's literally a commit replacing every instance of WAD with TAD in TwlIPL... There's literally a commit replacing every instance of WAD with TAD in TwlIPL...
https://github.com/rvtr/TwlIPL/commit/baca65d35d5d62d815c88e6374b895d5b0755277 https://github.com/rvtr/TwlIPL/commit/baca65d35d5d62d815c88e6374b895d5b0755277
*/ */
Header header; Header header;
fread(&header, sizeof(Header), 1, file); fread(&header, sizeof(Header), 1, file);
iprintf("Parsing TAD header:\n"); iprintf("Parsing TAD header:\n");
@ -236,6 +161,7 @@ int decryptTad(char const* src)
iprintf(" srlOffset: %lu\n", tad.srlOffset); iprintf(" srlOffset: %lu\n", tad.srlOffset);
iprintf(" metaSize: %lu\n", swap_endian_u32(header.metaSize)); iprintf(" metaSize: %lu\n", swap_endian_u32(header.metaSize));
iprintf(" metaOffset: %lu\n", tad.metaOffset); iprintf(" metaOffset: %lu\n", tad.metaOffset);
/* /*
Copy the contents of the TAD to the SD card. Copy the contents of the TAD to the SD card.
@ -244,16 +170,12 @@ int decryptTad(char const* src)
We can skip the cert since that already exists in NAND, and using the TAD's cert could introduce problems like We can skip the cert since that already exists in NAND, and using the TAD's cert could introduce problems like
trying to sign files for dev on a prod console. trying to sign files for dev on a prod console.
*/ */
iprintf("\n--------------------------------\nCopying output files:\n");
// ChatGPT ahh code
// Also more copy pasting because I am a silly idiot!
iprintf(" Copying TMD...\n");
FILE *tmdFile = fopen("sd:/_nds/tadtests/tmd.bin", "wb");
if (tmdFile == NULL) {
iprintf("ERROR: fopen()\n");
}
fseek(file, tad.tmdOffset, SEEK_SET);
iprintf("\n--------------------------------\nCopying output files:\n");
// Sorry for copy pasting, I'll make this a routine later
iprintf(" Copying TMD...\n");
FILE *tmdFile = fopen("sd:/_nds/tadtests/tmp/tmd.srl", "wb");
fseek(file, tad.tmdOffset, SEEK_SET);
for (int i = 0; i < swap_endian_u32(header.tmdSize); i++) { for (int i = 0; i < swap_endian_u32(header.tmdSize); i++) {
char ch = fgetc(file); char ch = fgetc(file);
fputc(ch, tmdFile); fputc(ch, tmdFile);
@ -261,31 +183,22 @@ int decryptTad(char const* src)
fclose(tmdFile); fclose(tmdFile);
iprintf(" Copying ticket...\n"); iprintf(" Copying ticket...\n");
FILE *ticketFile = fopen("sd:/_nds/tadtests/ticket.bin", "wb"); FILE *ticketFile = fopen("sd:/_nds/tadtests/tmp/ticket.srl", "wb");
if (ticketFile == NULL) {
iprintf("ERROR: fopen()\n");
}
fseek(file, tad.ticketOffset, SEEK_SET); fseek(file, tad.ticketOffset, SEEK_SET);
for (int i = 0; i < swap_endian_u32(header.ticketSize); i++) { for (int i = 0; i < swap_endian_u32(header.ticketSize); i++) {
char ch = fgetc(file); char ch = fgetc(file);
fputc(ch, ticketFile); fputc(ch, ticketFile);
} }
fclose(ticketFile); fclose(ticketFile);
/*
iprintf(" Copying SRL...\n");
FILE *srlFile = fopen("sd:/_nds/tadtests/srl_enc.bin", "wb");
if (srlFile == NULL) {
iprintf("ERROR: fopen()\n");
}
fseek(file, tad.srlOffset, SEEK_SET);
iprintf(" Copying SRL...\n");
FILE *srlFile = fopen("sd:/_nds/tadtests/tmp/srl_enc.srl", "wb");
fseek(file, tad.srlOffset, SEEK_SET);
for (int i = 0; i < swap_endian_u32(header.srlSize); i++) { for (int i = 0; i < swap_endian_u32(header.srlSize); i++) {
char ch = fgetc(file); char ch = fgetc(file);
fputc(ch, srlFile); fputc(ch, srlFile);
} }
fclose(srlFile); fclose(srlFile);
*/
fclose(file); fclose(file);
iprintf("\n--------------------------------\n"); iprintf("\n--------------------------------\n");
@ -293,16 +206,15 @@ int decryptTad(char const* src)
/* /*
Get the title key + IV from the ticket. Get the title key + IV from the ticket.
*/ */
iprintf("Decrypting SRL:\n\n"); iprintf("Decrypting SRL:\n\n");
iprintf(" Finding title key...\n"); iprintf(" Finding title key...\n");
FILE *ticket = fopen("sd:/_nds/tadtests/ticket.bin", "rb"); FILE *ticket = fopen("sd:/_nds/tadtests/tmp/ticket.srl", "rb");
unsigned char title_key_enc[16]; unsigned char title_key_enc[16];
fseek(ticket, 447, SEEK_SET); fseek(ticket, 447, SEEK_SET);
fread(title_key_enc, 1, 16, ticket); fread(title_key_enc, 1, 16, ticket);
iprintf(" Title key found!\n"); iprintf(" Title key found!\n");
for (int i = 0; i < 16; i++) { /* for (int i = 0; i < 16; i++) {iprintf("%02X", title_key_enc[i]);} */
iprintf("%02X", title_key_enc[i]);
}
iprintf("\n"); iprintf("\n");
iprintf(" Finding title key IV...\n"); iprintf(" Finding title key IV...\n");
unsigned char title_key_iv[16]; unsigned char title_key_iv[16];
@ -310,31 +222,58 @@ int decryptTad(char const* src)
fread(title_key_iv, 1, 8, ticket); fread(title_key_iv, 1, 8, ticket);
memset(title_key_iv + 8, 0, 8); memset(title_key_iv + 8, 0, 8);
iprintf(" Title key IV found!\n"); iprintf(" Title key IV found!\n");
for (int i = 0; i < 16; i++) { /* for (int i = 0; i < 16; i++) {iprintf("%02X", title_key_iv[i]);} */
iprintf("%02X", title_key_iv[i]);
}
iprintf("\n"); iprintf("\n");
fclose(ticket); fclose(ticket);
/*
This is SRL decryption. AES-CBC.
Common key + title key IV to decrypt title key, title key + content IV to decrypt content
We have to try each possible common key until we find one that works. I don't know a better way to do this
(nothing in the TAD would specify the key needed) so we'll try keys in the order of which ones are more common:
DEV --> DEBUGGER --> PROD
We check for only zerobytes at 0x15-1B to see if the SRL is decrypted properly. (should always be zerobytes)
https://problemkaputt.de/gbatek.htm#dscartridgeheader
https://gist.github.com/rvtr/f1069530129b7a57967e3fc4b30866b4#file-decrypt_tad-py-L84
*/
iprintf(" Decrypting title key...\n"); iprintf(" Decrypting title key...\n");
unsigned char decryptedBlock[16];
/* ============================================= */
iprintf(" Trying dev common key...\n");
for (int i = 0; i < sizeof(devKey); i++) {
printf("%02X", devKey[i]);
}
printf("\n");
/* ============================================= */
unsigned char title_key_dec[16]; unsigned char title_key_dec[16];
decrypt_cbc(devKey, title_key_iv, title_key_enc, sizeof(title_key_enc), sizeof(devKey), 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"); printf(" Title key decrypted!\n");
for (int i = 0; i < sizeof(title_key_dec); i++) { /* for (int i = 0; i < 16; i++) {printf("%02X", title_key_dec[i]);} */
printf("%02X", title_key_dec[i]);
} iprintf("\n Decrypting SRL chunks...\n");
printf("\n"); unsigned char srl_buffer_enc[16];
unsigned char srl_buffer_dec[16];
unsigned char content_iv[] = {
0x00, 0x00, 0x00, 0x00 ,0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
FILE *srlFile_enc = fopen("sd:/_nds/tadtests/tmp/srl_enc.srl", "rb");
fseek(srlFile_enc, 0, SEEK_SET);
FILE *srlFile_dec = fopen("sd:/_nds/tadtests/tmp/tad.srl", "wb");
fseek(srlFile_dec, 0, SEEK_SET);
for (int i = 0; i < swap_endian_u32(header.srlSize);) {
fread(srl_buffer_enc, 1, 16, srlFile_enc);
/* ===== silly debug ===== */
iprintf("%ld - %d / %ld", ftell(file), i, swap_endian_u32(header.srlSize));
/* ===== end of debug ===== */
decrypt_cbc(title_key_dec, content_iv, srl_buffer_enc, 16, 16, srl_buffer_dec);
fwrite(srl_buffer_dec, 1, 16, srlFile_dec);
i=i+16;
}
fclose(srlFile_enc);
fclose(srlFile_dec);
iprintf("\nDone everything!");
testroutine();
//return copyFilePart(src, 0, size, dst); //return copyFilePart(src, 0, size, dst);
return 0; return 0;