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Fix OTP decryption (M:/otp_dec.mem)

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This commit is contained in:
d0k3 2017-05-23 00:24:15 +02:00
parent c4c464cf5c
commit 2e011a0db0
1 changed files with 5 additions and 3 deletions
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8
source/virtual/vmem.c
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@ -26,7 +26,7 @@ u8 boot11_sha256[0x20] = {
};
// see: https://github.com/SciresM/CTRAesEngine/blob/8312adc74b911a6b9cb9e03982ba3768b8e2e69c/CTRAesEngine/AesEngine.cs#L672-L688
#define OTP_KEY ((u8*) BOOT9_POS + ((IS_DEVKIT) ? + 0x5710 : 0x56E0))
#define OTP_KEY ((u8*) BOOT9_POS + ((IS_DEVKIT) ? + 0xD700 : 0xD6E0))
#define OTP_IV (OTP_KEY + 0x10)
// see: http://3dbrew.org/wiki/Memory_layout#ARM9
@ -43,7 +43,7 @@ static const VirtualFile vMemFileTemplates[] = {
{ "fcramext.mem" , 0x28000000, 0x08000000, 0xFF, VFLAG_N3DS_ONLY },
{ "dtcm.mem" , 0x30008000, 0x00004000, 0xFF, 0 },
{ "otp.mem" , 0x10012000, 0x00000100, 0xFF, VFLAG_OTP },
// { "otp_dec.mem" , 0x10012000, 0x00000100, 0x11, VFLAG_OTP | VFLAG_BOOT9 },
{ "otp_dec.mem" , 0x10012000, 0x00000100, 0x11, VFLAG_OTP | VFLAG_BOOT9 },
// { "bootrom.mem" , 0xFFFF0000, 0x00010000, 0xFF, 0 },
// { "bootrom_unp.mem" , 0xFFFF0000, 0x00008000, 0xFF, 0 },
{ "godmode9.bin" , 0x23F00000, SELF_MAX_SIZE, 0xFF, VFLAG_PAYLOAD }
@ -75,10 +75,12 @@ bool ReadVMemDir(VirtualFile* vfile, VirtualDir* vdir) { // uses a generic vdir
int ReadVMemFile(const VirtualFile* vfile, u8* buffer, u64 offset, u64 count) {
if ((vfile->flags & VFLAG_OTP) && (vfile->keyslot == 0x11)) {
u8 __attribute__((aligned(32))) otp_local[vfile->size];
u8 __attribute__((aligned(32))) otp_iv[0x10];
u8* otp_mem = (u8*) (u32) vfile->offset;
memcpy(otp_iv, OTP_IV, 0x10);
setup_aeskey(0x11, OTP_KEY);
use_aeskey(0x11);
cbc_decrypt(otp_mem, otp_local, vfile->size, AES_CNT_TITLEKEY_DECRYPT_MODE, OTP_IV);
cbc_decrypt(otp_mem, otp_local, vfile->size / 0x10, AES_CNT_TITLEKEY_DECRYPT_MODE, otp_iv);
memcpy(buffer, otp_local + offset, count);
} else {
u32 foffset = vfile->offset + offset;