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exo2: use N's strategy for randcache, it's better

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Michael Scire 2020-05-13 20:44:13 -07:00 committed by SciresM
parent b7ff9e8fcc
commit 63629b22a1
1 changed files with 7 additions and 9 deletions
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16
exosphere2/program/source/smc/secmon_random_cache.cpp
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@ -86,17 +86,15 @@ namespace ams::secmon::smc {
u8 * const cache = GetRandomBytesCache();
u8 * cur_dst = static_cast<u8 *>(dst);
/* NOTE: Nintendo does not do bounds checking here, and does not do multiple reads when the get would wrap around. */
while (size > 0) {
const size_t copy_size = std::min(size, static_cast<size_t>(GetRandomBytesCacheSize() - g_random_offset_low));
std::memcpy(cur_dst, cache + g_random_offset_low, copy_size);
/* Copy out the requested size. */
std::memcpy(dst, cache + g_random_offset_low, size);
cur_dst += copy_size;
size -= copy_size;
/* Advance. */
g_random_offset_low += size;
if (g_random_offset_low + copy_size >= GetRandomBytesCacheSize()) {
g_random_offset_low = 0;
}
/* Ensure that at all times g_random_offset_low is not within 0x38 bytes of the end of the pool. */
if (g_random_offset_low + MaxRandomBytes >= GetRandomBytesCacheSize()) {
g_random_offset_low = 0;
}
}