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Fix zero-length Sha256 hash

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This commit is contained in:
Michael Theall 2016-08-25 06:25:06 -05:00
parent 277fc287a1
commit ada9559c11
1 changed files with 24 additions and 0 deletions
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24
libctru/source/services/fs.c
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@ -1203,6 +1203,30 @@ Result FSUSER_GetLegacySubBannerData(u32 bannerSize, FS_MediaType mediaType, u64
Result FSUSER_UpdateSha256Context(const void* data, u32 inputSize, u8* hash) Result FSUSER_UpdateSha256Context(const void* data, u32 inputSize, u8* hash)
{ {
if(!inputSize)
{
// For some reason a zero-size input outputs a garbage hash,
// so bypass the service call and just output it here.
if(hash)
{
static const u8 sha256_empty[32] =
{
0xE3, 0xB0, 0xC4, 0x42,
0x98, 0xFC, 0x1C, 0x14,
0x9A, 0xFB, 0xF4, 0xC8,
0x99, 0x6F, 0xB9, 0x24,
0x27, 0xAE, 0x41, 0xE4,
0x64, 0x9B, 0x93, 0x4C,
0xA4, 0x95, 0x99, 0x1B,
0x78, 0x52, 0xB8, 0x55,
};
memcpy(hash, sha256_empty, 0x20);
}
return 0;
}
u32 *cmdbuf = getThreadCommandBuffer(); u32 *cmdbuf = getThreadCommandBuffer();
cmdbuf[0] = IPC_MakeHeader(0x84E, 13, 2); // 0x84E0342 cmdbuf[0] = IPC_MakeHeader(0x84E, 13, 2); // 0x84E0342