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SetNcchKey(): Prevent unnecessary usage of SHA registers

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d0k3 2016-12-08 13:06:56 +01:00
parent eff96b3e5b
commit 310159f0cb
1 changed files with 12 additions and 6 deletions
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18
source/game/ncch.c
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@ -172,12 +172,18 @@ u32 SetNcchKey(NcchHeader* ncch, u32 keyid) {
// key Y for seed and non seed
if (keyid && (ncch->flags[7] & 0x20)) { // seed crypto
u8 keydata[16+16];
u8 seedkeyY[16+16];
memcpy(keydata, ncch->signature, 16);
if (GetNcchSeed(keydata + 16, ncch) != 0)
return 1;
sha_quick(seedkeyY, keydata, 32, SHA256_MODE);
static u8 seedkeyY[16+16] = { 0 };
static u8 lsignature[16] = { 0 };
static u64 ltitleId = 0;
if ((memcmp(lsignature, ncch->signature, 16) != 0) || (ltitleId != ncch->programId)) {
u8 keydata[16+16];
memcpy(keydata, ncch->signature, 16);
if (GetNcchSeed(keydata + 16, ncch) != 0)
return 1;
sha_quick(seedkeyY, keydata, 32, SHA256_MODE);
memcpy(lsignature, ncch->signature, 16);
ltitleId = ncch->programId;
}
setup_aeskeyY(keyslot, seedkeyY);
} else { // no seed crypto
setup_aeskeyY(keyslot, ncch->signature);