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fix last commit

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This commit is contained in:
RSDuck 2023-09-02 18:56:58 +02:00
parent 2a3a071216
commit 1aaf22d181
2 changed files with 15 additions and 6 deletions
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4
src/DSi_AES.h
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@ -28,14 +28,14 @@
// NOTE: Yes, the compiler does *not* recognize this code pattern, so it is indeed an optimization.
__attribute((always_inline)) static void Bswap128(void* Dst, void* Src)
{
*(__int128*)&Dst = __builtin_bswap128(*(__int128*)&Src);
*(__int128*)Dst = __builtin_bswap128(*(__int128*)Src);
}
#else
__attribute((always_inline)) static void Bswap128(void* Dst, void* Src)
{
for (int i = 0; i < 16; ++i)
{
((char*)Src)[i] = ((char*)Src)[15 - i];
((u8*)Dst)[i] = ((u8*)Src)[15 - i];
}
}
#endif

17
src/DSi_NAND.cpp
View File

@ -337,13 +337,16 @@ bool ESEncrypt(u8* data, u32 len)
{
u8 rem[16];
Bswap128(rem, &data[coarselen]);
memset(rem, 0, 16);
for (int i = 0; i < remlen; i++)
rem[15-i] = data[coarselen+i];
for (int i = 0; i < 16; i++) mac[i] ^= rem[i];
AES_CTR_xcrypt_buffer(&ctx, rem, sizeof(rem));
AES_ECB_encrypt(&ctx, mac);
Bswap128(&data[coarselen], rem);
for (int i = 0; i < remlen; i++)
data[coarselen+i] = rem[15-i];
}
ctx.Iv[13] = 0x00;
@ -424,14 +427,20 @@ bool ESDecrypt(u8* data, u32 len)
iv[14] = (ivnum >> 8) & 0xFF;
iv[15] = ivnum & 0xFF;
Bswap128(rem, &data[coarselen]);
memset(rem, 0, 16);
AES_ctx_set_iv(&ctx, iv);
AES_CTR_xcrypt_buffer(&ctx, rem, 16);
for (int i = 0; i < remlen; i++)
rem[15-i] = data[coarselen+i];
AES_ctx_set_iv(&ctx, iv);
AES_CTR_xcrypt_buffer(&ctx, rem, 16);
for (int i = 0; i < 16; i++) mac[i] ^= rem[i];
AES_ECB_encrypt(&ctx, mac);
Bswap128(&data[coarselen], rem);
for (int i = 0; i < remlen; i++)
data[coarselen+i] = rem[15-i];
}
ctx.Iv[13] = 0x00;