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Code Issues Releases Activity

make decrypting work for unaligned blocks

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This commit is contained in:
jimzrt 2019-09-25 10:12:15 +02:00
parent 76bfd54fd2
commit 5d6f606925
2 changed files with 171 additions and 111 deletions
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161
source/keys/keys.c
View file

@ -234,38 +234,38 @@ void dump_keys() {
se_aes_crypt_block_ecb(8, 0, master_key[6], master_key_source);
}
if (pkg1_id->kb >= KB_FIRMWARE_VERSION_620) {
// derive all lower master keys in case keyblobs are bad
if (_key_exists(master_key[pkg1_id->kb])) {
for (u32 i = pkg1_id->kb; i > 0; i--) {
se_aes_key_set(8, master_key[i], 0x10);
se_aes_crypt_block_ecb(8, 0, master_key[i-1], mkey_vectors[i]);
}
se_aes_key_set(8, master_key[0], 0x10);
se_aes_crypt_block_ecb(8, 0, temp_key, mkey_vectors[0]);
if (_key_exists(temp_key)) {
EPRINTFARGS("Failed to derive master key. kb = %d", pkg1_id->kb);
}
} else if (_key_exists(master_key[KB_FIRMWARE_VERSION_MAX])) {
// handle sept version differences
for (u32 kb = KB_FIRMWARE_VERSION_MAX; kb >= KB_FIRMWARE_VERSION_620; kb--) {
for (u32 i = kb; i > 0; i--) {
se_aes_key_set(8, master_key[i], 0x10);
se_aes_crypt_block_ecb(8, 0, master_key[i-1], mkey_vectors[i]);
}
se_aes_key_set(8, master_key[0], 0x10);
se_aes_crypt_block_ecb(8, 0, temp_key, mkey_vectors[0]);
if (!_key_exists(temp_key)) {
break;
}
memcpy(master_key[kb-1], master_key[kb], 0x10);
memcpy(master_key[kb], zeros, 0x10);
}
if (_key_exists(temp_key)) {
EPRINTF("Failed to derive master key.");
}
}
}
// if (pkg1_id->kb >= KB_FIRMWARE_VERSION_620) {
// // derive all lower master keys in case keyblobs are bad
// if (_key_exists(master_key[pkg1_id->kb])) {
// for (u32 i = pkg1_id->kb; i > 0; i--) {
// se_aes_key_set(8, master_key[i], 0x10);
// se_aes_crypt_block_ecb(8, 0, master_key[i-1], mkey_vectors[i]);
// }
// se_aes_key_set(8, master_key[0], 0x10);
// se_aes_crypt_block_ecb(8, 0, temp_key, mkey_vectors[0]);
// if (_key_exists(temp_key)) {
// EPRINTFARGS("Failed to derive master key. kb = %d", pkg1_id->kb);
// }
// } else if (_key_exists(master_key[KB_FIRMWARE_VERSION_MAX])) {
// // handle sept version differences
// for (u32 kb = KB_FIRMWARE_VERSION_MAX; kb >= KB_FIRMWARE_VERSION_620; kb--) {
// for (u32 i = kb; i > 0; i--) {
// se_aes_key_set(8, master_key[i], 0x10);
// se_aes_crypt_block_ecb(8, 0, master_key[i-1], mkey_vectors[i]);
// }
// se_aes_key_set(8, master_key[0], 0x10);
// se_aes_crypt_block_ecb(8, 0, temp_key, mkey_vectors[0]);
// if (!_key_exists(temp_key)) {
// break;
// }
// memcpy(master_key[kb-1], master_key[kb], 0x10);
// memcpy(master_key[kb], zeros, 0x10);
// }
// if (_key_exists(temp_key)) {
// EPRINTF("Failed to derive master key.");
// }
// }
// }
u8 *keyblob_block = (u8 *)calloc(NX_EMMC_BLOCKSIZE, 1);
u8 keyblob_mac[0x10] = {0};
@ -387,12 +387,16 @@ void dump_keys() {
gfx_hexdump(0, buffer, sizeof(buffer));
//free(buffer);
verify();
writeClientCertHash();
writeCal0Hash();
// restore();
verify();
// writeClientCertHash();
// writeCal0Hash();
// verify();
// verify();
// free(tmp_copy);
@ -686,11 +690,25 @@ bool writeData(u8 *buffer, u32 offset, u32 length)
bool writeHash(u32 hashOffset, u32 offset, u32 sz)
{
u8 *buffer = (u8 *)malloc(NX_EMMC_BLOCKSIZE);
SHA256_CTX ctx;
sha256_init(&ctx);
u32 newOffset = offset % NX_EMMC_BLOCKSIZE;
if (newOffset > 0 && newOffset + sz >= NX_EMMC_BLOCKSIZE)
{
u32 toRead = NX_EMMC_BLOCKSIZE - newOffset;
readData(buffer, offset, toRead);
// gfx_hexdump(0, buffer + NX_EMMC_BLOCKSIZE - 8, 8);
sha256_update(&ctx, buffer, toRead);
sz -= toRead;
offset += toRead;
}
while (sz > NX_EMMC_BLOCKSIZE)
{
@ -702,8 +720,8 @@ bool writeHash(u32 hashOffset, u32 offset, u32 sz)
offset += NX_EMMC_BLOCKSIZE;
}
if(sz > 0){
if (sz > 0)
{
readData(buffer, offset, sz);
sha256_update(&ctx, buffer, sz);
@ -728,19 +746,32 @@ bool verifyHash(u32 hashOffset, u32 offset, u32 sz)
SHA256_CTX ctx;
sha256_init(&ctx);
while (sz > 64)
u32 newOffset = offset % NX_EMMC_BLOCKSIZE;
if (newOffset > 0 && newOffset + sz >= NX_EMMC_BLOCKSIZE)
{
readData(buffer, offset, 64);
u32 toRead = NX_EMMC_BLOCKSIZE - newOffset;
readData(buffer, offset, toRead);
// gfx_hexdump(0, buffer + NX_EMMC_BLOCKSIZE - 8, 8);
sha256_update(&ctx, buffer, 64);
sha256_update(&ctx, buffer, toRead);
sz -= 64;
offset += 64;
sz -= toRead;
offset += toRead;
}
if(sz > 0){
while (sz > NX_EMMC_BLOCKSIZE)
{
readData(buffer, offset, NX_EMMC_BLOCKSIZE);
// gfx_hexdump(0, buffer + NX_EMMC_BLOCKSIZE - 8, 8);
sha256_update(&ctx, buffer, NX_EMMC_BLOCKSIZE);
sz -= NX_EMMC_BLOCKSIZE;
offset += NX_EMMC_BLOCKSIZE;
}
if (sz > 0)
{
readData(buffer, offset, sz);
sha256_update(&ctx, buffer, sz);
@ -854,23 +885,51 @@ void backup(){
f_open(&fp, "sd:/prodinfoENC.bin", FA_CREATE_NEW | FA_WRITE);
size = 0x3FBC00;
offset = 0;
while(size > NX_EMMC_BLOCKSIZE){
while(size > 0){
nx_emmc_part_read(&storage, prodinfo_part, offset, 1, bufferNX);
f_write(&fp, bufferNX, NX_EMMC_BLOCKSIZE, NULL);
offset ++;
size -= NX_EMMC_BLOCKSIZE;
}
if(size > 0){
nx_emmc_part_read(&storage, prodinfo_part, offset, 1, bufferNX);
f_write(&fp, bufferNX, size, NULL);
}
// if(size > 0){
// nx_emmc_part_read(&storage, prodinfo_part, offset, 1, bufferNX);
// f_write(&fp, bufferNX, size, NULL);
// }
f_close(&fp);
gfx_printf("\n%kBackup encrypted done!", 4);
gfx_printf("\n%kBackup encrypted done!", colors[4]);
}
bool restore(){
FIL fp;
if(f_open(&fp, "sd:/prodinfoENC.bin", FA_READ) != FR_OK){
gfx_printf("\n%Cannot open prodinfEnc.bin!", 4);
return false;
}
u8 bufferNX[NX_EMMC_BLOCKSIZE];
u32 size = 0x3FBC00;
u32 offset = 0;
while(size > 0){
f_read(&fp, bufferNX, NX_EMMC_BLOCKSIZE, NULL);
nx_emmc_part_write(&storage, prodinfo_part, offset, 1, bufferNX);
offset ++;
size -= NX_EMMC_BLOCKSIZE;
}
// if(size > 0){
// f_read(&fp, bufferNX, size, NULL);
// nx_emmc_part_write(&storage, prodinfo_part, offset, 1, bufferNX);
// f_write(&fp, bufferNX, size, NULL);
// }
f_close(&fp);
gfx_printf("\n%Restore encrypted done!", 4);
return true;
}
// bool erase(u32 offset, u32 sz)
// {
// u8 zero = 0;

1
source/keys/keys.h
View file

@ -25,5 +25,6 @@ bool writeData(u8 *buffer, u32 offset, u32 length);
bool writeClientCertHash();
bool writeCal0Hash();
bool verify();
bool restore();
#endif