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[makerom] corrected aes keygen code, thanks plutoo.

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This commit is contained in:
jakcron
2016-01-15 21:51:59 +08:00
parent 8420f9dadd
commit fefa25f5ad
5 changed files with 29 additions and 21 deletions
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makerom/aes_keygen.c
+22
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@@ -106,6 +106,7 @@ void n128_xor(const uint8_t *a, const uint8_t *b, uint8_t *out)
}
// keygen algorithm
/*
void n_aes_keygen(const uint8_t *x, uint8_t x_shift, const uint8_t *y, uint8_t y_shift, const uint8_t *keygen_constant, uint8_t *key)
{
// overall algo:
@@ -121,4 +122,25 @@ void n_aes_keygen(const uint8_t *x, uint8_t x_shift, const uint8_t *y, uint8_t y
// Add secret
n128_add(key_xy, keygen_constant, key);
}
*/
void ctr_aes_keygen(const uint8_t *x, const uint8_t *y, uint8_t *key)
{
static const uint8_t KEYGEN_CONST[16] = { 0x1F, 0xF9, 0xE9, 0xAA, 0xC5, 0xFE, 0x04, 0x08, 0x02, 0x45, 0x91, 0xDC, 0x5D, 0x52, 0x76, 0x8A };
// overall algo:
// key = (((x <<< 2) ^ y) + KEYGEN_CONST) >>> 41
uint8_t x_rot[16], key_xy[16], key_xyc[16];
// x_rot = x <<< 2
n128_lrot(x, 2, x_rot);
// key_xy = x_rot ^ y
n128_xor(x_rot, y, key_xy);
// key_xyc = key_xy + KEYGEN_CONST
n128_add(key_xy, KEYGEN_CONST, key);
n128_rrot(key_xyc, 41, key);
}
makerom/aes_keygen.h
+2 -6
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@@ -2,11 +2,7 @@
#include <stdint.h>
/*
AES Key generator for the Nintendo (Handheld) Consoles
BYO keygen constants, and input >>> parameters
key = ((x >>> x_shift) ^ (y >>> y_shift)) + keygen_constant
AES Key generator for the Nintendo 3DS (CTR) Consoles
*/
void n_aes_keygen(const uint8_t *x, uint8_t x_shift, const uint8_t *y, uint8_t y_shift, const uint8_t *keygen_constant, uint8_t *key);
void ctr_aes_keygen(const uint8_t *x, const uint8_t *y, uint8_t *key);
makerom/keyset.c
+1 -10
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@@ -48,15 +48,6 @@ void PrintBadKeySize(char *path, u32 size)
fprintf(stderr,"[KEYSET ERROR] %s has invalid size (0x%x)\n",path,size);
}
u8* AesKeyScrambler(u8 *key, const u8 *keyX, const u8 *keyY)
{
static const uint8_t CTR_KEYGEN_CONST[16] = { 0xEE, 0x2E, 0xA9, 0x3B, 0x45, 0x0F, 0xFC, 0xF4, 0xD5, 0x62, 0xFF, 0x02, 0x04, 0x01, 0x22, 0xC8 };
static const uint8_t CTR_KEYX_SHIFT = 39;
static const uint8_t CTR_KEYY_SHIFT = 41;
n_aes_keygen(keyX, CTR_KEYX_SHIFT, keyY, CTR_KEYY_SHIFT, CTR_KEYGEN_CONST, key);
return key;
}
int SetKeys(keys_struct *keys)
{
int result = 0;
@@ -135,7 +126,7 @@ int LoadKeysFromResources(keys_struct *keys)
// CIA
//for(int i = 0; i < 6; i++){
// keys->aes.commonKey[i] = malloc(16);
// AesKeyScrambler(keys->aes.commonKey[i], ctr_common_etd_keyX_ppki, ctr_common_etd_keyY_ppki[i]);
// ctr_aes_keygen(ctr_common_etd_keyX_ppki, ctr_common_etd_keyY_ppki[i], keys->aes.commonKey[i]);
//}
if(keys->aes.currentCommonKey > 0xff)
SetCurrentCommonKey(keys,0);
makerom/keyset.h
+1 -3
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@@ -96,6 +96,4 @@ void FreeKeys(keys_struct *keys);
int SetCommonKey(keys_struct *keys, const u8 *key, u8 Index);
int SetCurrentCommonKey(keys_struct *keys, u8 Index);
int SetNormalKey(keys_struct *keys, const u8 *key);
int SetSystemFixedKey(keys_struct *keys, const u8 *key);
u8* AesKeyScrambler(u8 *key, const u8 *keyX, const u8 *keyY);
int SetSystemFixedKey(keys_struct *keys, const u8 *key);
makerom/ncch.c
+3 -2
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@@ -1,4 +1,5 @@
#include "lib.h"
#include "aes_keygen.h"
#include "ncch_build.h"
#include "exheader_build.h"
#include "exheader_read.h"
@@ -1043,12 +1044,12 @@ bool SetNcchKeys(keys_struct *keys, ncch_hdr *hdr)
}
if(keys->aes.ncchKeyX[0])
AesKeyScrambler(keys->aes.ncchKey0,keys->aes.ncchKeyX[0],hdr->signature);
ctr_aes_keygen(keys->aes.ncchKeyX[0],hdr->signature,keys->aes.ncchKey0);
else
return false;
if(keys->aes.ncchKeyX[hdr->flags[ncchflag_CONTENT_KEYX]])
AesKeyScrambler(keys->aes.ncchKey1,keys->aes.ncchKeyX[hdr->flags[ncchflag_CONTENT_KEYX]],hdr->signature);
ctr_aes_keygen(keys->aes.ncchKeyX[ncchflag_CONTENT_KEYX], hdr->signature, keys->aes.ncchKey0);
else
return false;