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fs: add AesCtrStorage

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This commit is contained in:
Michael Scire 2020-04-06 03:58:52 -07:00
parent 496be5ecd4
commit 0e9974e7b3
9 changed files with 303 additions and 3 deletions
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19
libraries/libstratosphere/source/fssystem/fssystem_utility.cpp
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@ -149,4 +149,23 @@ namespace ams::fssystem {
return EnsureDirectoryRecursivelyImpl(fs, path, false);
}
void AddCounter(void *_counter, size_t counter_size, u64 value) {
u8 *counter = static_cast<u8 *>(_counter);
u64 remaining = value;
u8 carry = 0;
for (size_t i = 0; i < counter_size; i++) {
auto sum = counter[counter_size - 1 - i] + (remaining & 0xFF) + carry;
carry = static_cast<u8>(sum >> BITSIZEOF(u8));
auto sum8 = static_cast<u8>(sum & 0xFF);
counter[counter_size - 1 - i] = sum8;
remaining >>= BITSIZEOF(u8);
if (carry == 0 && remaining == 0) {
break;
}
}
}
}