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[ctrtool] Rewrote NCCH crypto. "--exefs" is still broken.

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This commit is contained in:
jakcron
2017-06-05 11:32:13 +08:00
parent 56ef8b41d1
commit b8b92d8bfa
4 changed files with 173 additions and 162 deletions
Download Patch File Download Diff File Expand all files Collapse all files
ctrtool/exefs.c
+12 -14
View File
@@ -48,10 +48,10 @@ void exefs_set_encrypted(exefs_context* ctx, u32 encrypted)
ctx->encrypted = encrypted;
}
void exefs_set_keys(exefs_context* ctx, u8 key[16], u8 special_key[16])
void exefs_set_keys(exefs_context* ctx, u8 key0[16], u8 key1[16])
{
memcpy(ctx->key, key, 16);
memcpy(ctx->special_key, special_key, 16);
memcpy(ctx->key[0], key0, 16);
memcpy(ctx->key[1], key1, 16);
}
void exefs_set_counter(exefs_context* ctx, u8 counter[16])
@@ -109,7 +109,7 @@ void exefs_save(exefs_context* ctx, u32 index, u32 flags)
}
fseeko64(ctx->file, ctx->offset + offset, SEEK_SET);
ctr_init_key(&ctx->aes, ctx->key);
ctr_init_key(&ctx->aes, ctx->key[0]);
ctr_init_counter(&ctx->aes, ctx->counter);
ctr_add_counter(&ctx->aes, offset / 0x10);
@@ -132,12 +132,10 @@ void exefs_save(exefs_context* ctx, u32 index, u32 flags)
}
if (ctx->encrypted) {
// .code and .firm use a special key on 7.0+
if (ctx->encrypted & NCCHCRYPTO_SPECIAL_FSES)
ctr_init_key(&ctx->aes, ctx->special_key);
ctr_crypt_counter(&ctx->aes, compressedbuffer, compressedbuffer, compressedsize);
if (ctx->encrypted & NCCHCRYPTO_SPECIAL_FSES)
ctr_init_key(&ctx->aes, ctx->key);
if (strncmp((const char*)section->name, "icon", 8) == 0 || strncmp((const char*)section->name, "banner", 8) == 0)
ctr_init_key(&ctx->aes, ctx->key[0]);
else
ctr_init_key(&ctx->aes, ctx->key[1]);
}
@@ -203,7 +201,7 @@ void exefs_read_header(exefs_context* ctx, u32 flags)
fread(&ctx->header, 1, sizeof(exefs_header), ctx->file);
if (ctx->encrypted) {
ctr_init_key(&ctx->aes, ctx->key);
ctr_init_key(&ctx->aes, ctx->key[0]);
ctr_init_counter(&ctx->aes, ctx->counter);
ctr_crypt_counter(&ctx->aes, (u8*)&ctx->header, (u8*)&ctx->header, sizeof(exefs_header));
}
@@ -261,10 +259,10 @@ int exefs_verify(exefs_context* ctx, u32 index, u32 flags)
return 0;
fseeko64(ctx->file, ctx->offset + offset, SEEK_SET);
if (index == 0 && (ctx->encrypted & NCCHCRYPTO_SPECIAL_FSES))
ctr_init_key(&ctx->aes, ctx->special_key);
if (strncmp((const char*)section->name, "icon", 8) == 0 || strncmp((const char*)section->name, "banner", 8) == 0)
ctr_init_key(&ctx->aes, ctx->key[0]);
else
ctr_init_key(&ctx->aes, ctx->key);
ctr_init_key(&ctx->aes, ctx->key[1]);
ctr_init_counter(&ctx->aes, ctx->counter);
ctr_add_counter(&ctx->aes, offset / 0x10);
ctrtool/exefs.h
+1 -2
View File
@@ -29,8 +29,7 @@ typedef struct
settings* usersettings;
u8 partitionid[8];
u8 counter[16];
u8 key[16];
u8 special_key[16];
u8 key[2][16];
u64 offset;
u64 size;
exefs_header header;
ctrtool/ncch.c
+157 -137
View File
@@ -79,7 +79,7 @@ void ncch_get_counter(ncch_context* ctx, u8 counter[16], u8 type)
}
/* this is broken */
int ncch_extract_prepare(ncch_context* ctx, u32 type, u32 flags)
{
u64 offset = 0;
@@ -93,6 +93,7 @@ int ncch_extract_prepare(ncch_context* ctx, u32 type, u32 flags)
{
offset = ncch_get_exefs_offset(ctx);
size = ncch_get_exefs_size(ctx);
ctr_init_key(&ctx->aes, ctx->key[0]);
}
break;
@@ -100,6 +101,7 @@ int ncch_extract_prepare(ncch_context* ctx, u32 type, u32 flags)
{
offset = ncch_get_romfs_offset(ctx);
size = ncch_get_romfs_size(ctx);
ctr_init_key(&ctx->aes, ctx->key[1]);
}
break;
@@ -107,6 +109,7 @@ int ncch_extract_prepare(ncch_context* ctx, u32 type, u32 flags)
{
offset = ncch_get_exheader_offset(ctx);
size = ncch_get_exheader_size(ctx) * 2;
ctr_init_key(&ctx->aes, ctx->key[0]);
}
break;
@@ -136,7 +139,7 @@ int ncch_extract_prepare(ncch_context* ctx, u32 type, u32 flags)
ctx->extractflags = flags;
fseeko64(ctx->file, offset, SEEK_SET);
ncch_get_counter(ctx, counter, type);
ctr_init_key(&ctx->aes, ctx->key);
ctr_init_counter(&ctx->aes, counter);
return 1;
@@ -351,7 +354,7 @@ void ncch_process(ncch_context* ctx, u32 actions)
exheader_set_programid(&ctx->exheader, ctx->header.programid);
exheader_set_hash(&ctx->exheader, ctx->header.extendedheaderhash);
exheader_set_counter(&ctx->exheader, exheadercounter);
exheader_set_key(&ctx->exheader, ctx->key);
exheader_set_key(&ctx->exheader, ctx->key[0]);
exheader_set_encrypted(&ctx->exheader, ctx->encrypted);
exefs_set_file(&ctx->exefs, ctx->file);
@@ -360,7 +363,7 @@ void ncch_process(ncch_context* ctx, u32 actions)
exefs_set_partitionid(&ctx->exefs, ctx->header.partitionid);
exefs_set_usersettings(&ctx->exefs, ctx->usersettings);
exefs_set_counter(&ctx->exefs, exefscounter);
exefs_set_keys(&ctx->exefs, ctx->key, ctx->special_key);
exefs_set_keys(&ctx->exefs, ctx->key[0], ctx->key[1]);
exefs_set_encrypted(&ctx->exefs, ctx->encrypted);
romfs_set_file(&ctx->romfs, ctx->file);
@@ -368,10 +371,7 @@ void ncch_process(ncch_context* ctx, u32 actions)
romfs_set_size(&ctx->romfs, ncch_get_romfs_size(ctx));
romfs_set_usersettings(&ctx->romfs, ctx->usersettings);
romfs_set_counter(&ctx->romfs, romfscounter);
if (ctx->encrypted & NCCHCRYPTO_SPECIAL_FSES)
romfs_set_key(&ctx->romfs, ctx->special_key);
else
romfs_set_key(&ctx->romfs, ctx->key);
romfs_set_key(&ctx->romfs, ctx->key[1]);
romfs_set_encrypted(&ctx->romfs, ctx->encrypted);
exheader_read(&ctx->exheader, actions);
@@ -392,11 +392,18 @@ void ncch_process(ncch_context* ctx, u32 actions)
if ((actions & ShowKeysFlag) && ctx->encrypted)
{
fprintf(stdout, "Using key(s):\n");
memdump(stdout, " 0x2C: ", ctx->key, 0x10);
if (ctx->encrypted & NCCHCRYPTO_SPECIAL_FSES)
if (ctx->encrypted == NCCHCRYPTO_FIXED)
{
fprintf(stdout, " special (%02x): ", ctx->header.flags[3]);
memdump(stdout, "", ctx->special_key, 0x10);
memdump(stdout, " Key: ", ctx->key[0], 0x10);
}
else
{
memdump(stdout, " 0x2C: ", ctx->key[0], 0x10);
if (memcmp(ctx->key[0], ctx->key[1], 0x10) != 0)
{
fprintf(stdout, " special (%02x): ", ctx->header.flags[3]);
memdump(stdout, "", ctx->key[1], 0x10);
}
}
}
@@ -510,150 +517,163 @@ u64 ncch_get_mediaunit_size(ncch_context* ctx)
void ncch_determine_key(ncch_context* ctx, u32 actions)
{
exheader_header exheader;
u8* key;
u8* seed;
ctr_ncchheader* header = &ctx->header;
u8 exheader_buffer[0x400];
u8 seedbuf[0x20];
u8 seedhash[0x20];
u8 keyX[0x10], keyY[0x10], seedKeyY[0x10];
ctx->encrypted = 0;
memset(ctx->key, 0, 0x10);
if (actions & PlainFlag)
u8* seed;
u8 hash[0x20];
ctr_ncchheader* header = &ctx->header;
struct sNcchKeyslot
{
ctx->encrypted = 0;
u8 x[0x10];
u8 y[0x10];
u8 key[0x10];
} key[2];
// Check if the NCCH is already decrypted, by checking if the exheader hash matches
// Otherwise, use determination rules
fseeko64(ctx->file, ncch_get_exheader_offset(ctx), SEEK_SET);
memset(exheader_buffer, 0, getle32(header->extendedheadersize));
fread(exheader_buffer, 1, getle32(header->extendedheadersize), ctx->file);
ctr_sha_256(exheader_buffer, getle32(header->extendedheadersize), hash);
if (!memcmp(hash, header->extendedheaderhash, 32))
{
// exheader hash matches, so probably decrypted
ctx->encrypted = NCCHCRYPTO_NONE;
if (!(header->flags[7] & 4))
fprintf(stderr, "Warning, exheader is decrypted but the NCCH says it isn't.\n"
"This NCCH will likely break on console.\n");
return;
}
else
// if not plain flag set and not ncch unencrypted flag set
// determine the keys
if (!(actions & PlainFlag) && !(header->flags[7] & 4))
{
// No explicit NCCH key defined, so we try to decide
// In almost all of these scenarios, the normal 0x2C NCCH keyX will be the default,
// except for the old fixedkey crypto, where we'll override it anyway, so let's just
// set the 0x2C keyX first.
key = settings_get_ncchkeyX_old(ctx->usersettings);
if (key)
memcpy(keyX, key, 0x10);
else
fprintf(stderr, "Warning, could not read NCCH base key. Decryption will likely fail.\n");
// The keyY is normally the beginning of the NCCH header signature. In case seed crypto
// changes that, we'll override it below.
memcpy(keyY, header->signature, 0x10);
memcpy(seedKeyY, keyY, 0x10);
// 0x2c crypto is normally used; we override it where necessary
ctr_aes_keygen(keyX, keyY, ctx->key);
// Seed crypto can be used alongside any other crypto type, so we'll need to figure this out early.
if (header->flags[7] & 0x20)
{
ctx->encrypted = NCCHCRYPTO_SEED;
seed = settings_get_seed(ctx->usersettings, getle64(header->partitionid));
if (!seed)
{
fprintf(stderr, "This title uses seed crypto, but no seed is set in seedDB, unable to decrypt.\n"
"Use -p to avoid decryption or use --seeddb=dbfile to specify the seedDB.\n");
ctx->encrypted = NCCHCRYPTO_BROKEN;
return;
}
memcpy(seedbuf, seed, 0x10);
// Assumes running on little endian
memcpy(seedbuf + 0x10, header->programid, sizeof(header->programid));
ctr_sha_256(seedbuf, 0x18, seedhash);
if (memcmp(seedhash, header->seedcheck, sizeof(header->seedcheck))) {
fprintf(stderr, "Seed check mismatch. (Got: %02x%02x%02x%02x, expected: %02x%02x%02x%02x)\n",
seedhash[0], seedhash[1], seedhash[2], seedhash[3],
header->seedcheck[0], header->seedcheck[1], header->seedcheck[2], header->seedcheck[3]);
ctx->encrypted = NCCHCRYPTO_BROKEN;
return;
}
memcpy(seedbuf, header->signature, 0x10);
memcpy(seedbuf + 0x10, seed, 0x10);
ctr_sha_256(seedbuf, 0x20, seedhash);
memcpy(seedKeyY, seedhash, 0x10);
}
// Check if the NCCH is already decrypted, by reading the programid in the exheader
// Otherwise, use determination rules
fseeko64(ctx->file, ncch_get_exheader_offset(ctx), SEEK_SET);
memset(&exheader, 0, sizeof(exheader));
fread(&exheader, 1, sizeof(exheader), ctx->file);
if (!memcmp(exheader.arm11systemlocalcaps.programid, ctx->header.programid, 8))
{
// program id's match, so it's probably not encrypted
ctx->encrypted = NCCHCRYPTO_NONE;
if (!(header->flags[7] & 4))
fprintf(stderr, "Warning, exheader seems decrypted but the NCCH says it isn't.\n"
"This NCCH will likely break on console.\n");
}
else if (header->flags[7] & 4) // no crypto
{
ctx->encrypted = NCCHCRYPTO_NONE;
}
else if (header->flags[7] & 1) // fixed key crypto
// fixed key crypto
if (header->flags[7] & 1)
{
ctx->encrypted = NCCHCRYPTO_FIXED;
if (programid_is_system(header->programid))
{
// fixed system key
key = settings_get_ncch_fixedsystemkey(ctx->usersettings);
if (!key) {
if (settings_get_ncch_fixedsystemkey(ctx->usersettings) == NULL)
{
fprintf(stderr, "Error, could not read system fixed key.\n");
ctx->encrypted = NCCHCRYPTO_BROKEN;
} else {
memcpy(ctx->key, key, 0x10);
return;
}
memcpy(key[0].key, settings_get_ncch_fixedsystemkey(ctx->usersettings), 0x10);
}
else
{
// null key
memset(ctx->key, 0, 0x10);
memset(key[0].key, 0x00, 0x10);
}
memcpy(key[1].key, key[0].key, 0x10);
}
else if (header->flags[3] == 0x01) // 7.0 crypto
{
ctx->encrypted = NCCHCRYPTO_SEVEN;
key = settings_get_ncchkeyX_seven(ctx->usersettings);
if (!key) {
fprintf(stderr, "Error, could not read NCCH 7.0 keyX.\n");
return;
}
ctr_aes_keygen(key, seedKeyY, ctx->special_key);
}
else if (header->flags[3] == 0x0A) // N9.3 crypto
{
ctx->encrypted = NCCHCRYPTO_NINETHREE;
key = settings_get_ncchkeyX_ninethree(ctx->usersettings);
if (!key) {
fprintf(stderr, "Error, could not read NCCH 9.3 keyX.\n");
return;
}
ctr_aes_keygen(key, seedKeyY, ctx->special_key);
}
else if (header->flags[3] == 0x0B) // N9.6 crypto
{
ctx->encrypted = NCCHCRYPTO_NINESIX;
key = settings_get_ncchkeyX_ninesix(ctx->usersettings);
if (!key) {
fprintf(stderr, "Error, could not read NCCH 9.6 keyX.\n");
return;
}
ctr_aes_keygen(key, seedKeyY, ctx->special_key);
}
else if (header->flags[3] != 0) // unknown special crypto
{
fprintf(stderr, "Warning, unknown NCCH crypto method.\n");
ctx->encrypted = NCCHCRYPTO_BROKEN;
}
// secure crypto
else
{
// old/normal NCCH crypto
ctx->encrypted = NCCHCRYPTO_OLD;
ctx->encrypted = NCCHCRYPTO_SECURE;
if (settings_get_ncchkeyX_old(ctx->usersettings) == NULL)
{
fprintf(stderr, "Error, could not read NCCH base keyX.\n");
ctx->encrypted = NCCHCRYPTO_BROKEN;
return;
}
// setup regular keyslot seeds (exheader, exefs:icon|banner)
memcpy(key[0].x, settings_get_ncchkeyX_old(ctx->usersettings), 0x10);
memcpy(key[0].y, header->signature, 0x10);
// setup second keyslot seed (romfs, exefs:!(icon|banner))
// - get keyX
if (header->flags[3] == 0)
{
memcpy(key[1].x, key[0].x, 0x10);
}
else if (header->flags[3] == 1)
{
if (settings_get_ncchkeyX_seven(ctx->usersettings) == NULL)
{
fprintf(stderr, "Error, could not read NCCH 7.0 keyX.\n");
return;
}
memcpy(key[1].x, settings_get_ncchkeyX_seven(ctx->usersettings), 0x10);
}
else if (header->flags[3] == 10)
{
if (settings_get_ncchkeyX_ninethree(ctx->usersettings) == NULL)
{
fprintf(stderr, "Error, could not read NCCH 9.3 keyX.\n");
return;
}
memcpy(key[1].x, settings_get_ncchkeyX_ninethree(ctx->usersettings), 0x10);
}
else if (header->flags[3] == 11)
{
if (settings_get_ncchkeyX_ninesix(ctx->usersettings) == NULL)
{
fprintf(stderr, "Error, could not read NCCH 9.6 keyX.\n");
return;
}
memcpy(key[1].x, settings_get_ncchkeyX_ninesix(ctx->usersettings), 0x10);
}
else
{
fprintf(stderr, "Warning, unknown NCCH crypto method.\n");
ctx->encrypted = NCCHCRYPTO_BROKEN;
return;
}
// - get keyY
if (header->flags[7] & 0x20)
{
seed = settings_get_seed(ctx->usersettings, getle64(header->partitionid));
if (!seed)
{
fprintf(stderr, "This title uses seed crypto, but no seed is set, unable to decrypt.\n"
"Use -p to avoid decryption or use --seeddb=dbfile or --seed=SEEDHERE.\n");
ctx->encrypted = NCCHCRYPTO_BROKEN;
return;
}
memcpy(seedbuf, seed, 0x10);
// Assumes running on little endian
memcpy(seedbuf + 0x10, header->programid, sizeof(header->programid));
ctr_sha_256(seedbuf, 0x18, hash);
if (memcmp(hash, header->seedcheck, sizeof(header->seedcheck))) {
fprintf(stderr, "Seed check mismatch. (Got: %02x%02x%02x%02x, expected: %02x%02x%02x%02x)\n",
hash[0], hash[1], hash[2], hash[3],
header->seedcheck[0], header->seedcheck[1], header->seedcheck[2], header->seedcheck[3]);
ctx->encrypted = NCCHCRYPTO_BROKEN;
return;
}
memcpy(seedbuf, header->signature, 0x10);
memcpy(seedbuf + 0x10, seed, 0x10);
ctr_sha_256(seedbuf, 0x20, hash);
memcpy(key[1].y, hash, 0x10);
}
else
{
memcpy(key[1].y, key[0].y, 0x10);
}
// generate keys
ctr_aes_keygen(key[0].x, key[0].y, key[0].key);
ctr_aes_keygen(key[1].x, key[1].y, key[1].key);
}
// save keys
memcpy(ctx->key[0], key[0].key, 0x10);
memcpy(ctx->key[1], key[1].key, 0x10);
}
else
{
ctx->encrypted = NCCHCRYPTO_NONE;
}
}
ctrtool/ncch.h
+3 -9
View File
@@ -24,13 +24,8 @@ typedef enum
{
NCCHCRYPTO_NONE = 0, //< already decrypted
NCCHCRYPTO_FIXED = 1, //< fixed key crypto, used for SDK-made application titles and very very old system titles
NCCHCRYPTO_OLD = (1<<1), //< crypto used before 7.0
NCCHCRYPTO_SEVEN = (1<<2), //< crypto used starting with 7.0
NCCHCRYPTO_NINETHREE = (1<<3), //< crypto used on N3DS starting with 9.3
NCCHCRYPTO_NINESIX = (1<<4), //< crypto used on N3DS starting with 9.6
NCCHCRYPTO_SEED = (1<<5), //< crypto used starting with 9.6 for preloading titles
NCCHCRYPTO_SPECIAL_FSES = NCCHCRYPTO_SEVEN | NCCHCRYPTO_NINETHREE | NCCHCRYPTO_NINESIX | NCCHCRYPTO_SEED, //< ExeFS and RomFS need new keys
NCCHCRYPTO_BROKEN = 0xFF //< Internal: seed crypto required but no seed set
NCCHCRYPTO_SECURE = (1<<1), //< hardware generated key
NCCHCRYPTO_BROKEN = 0xFF //< Internal: failed to generate key, but encryption still used
} ctr_ncchcryptotype;
typedef struct
@@ -70,8 +65,7 @@ typedef struct
typedef struct
{
FILE* file;
u8 key[16];
u8 special_key[16]; // used with the 7.x+ crypto methods
u8 key[2][16];
u8 seed[16];
u32 encrypted;
u64 offset;