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aes_util: Allow SetIV to be non-allocating

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In a few places, the data to be set as the IV is already within an array.
We shouldn't require this data to be heap-allocated if it doesn't need
to be. This allows certain callers to reduce heap churn.
This commit is contained in:
Lioncash
2020-08-03 14:14:39 -04:00
parent 9b75481755
commit 15660bd857
7 changed files with 36 additions and 27 deletions
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9
src/core/crypto/ctr_encryption_layer.cpp
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@ -2,6 +2,7 @@
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <algorithm>
#include <cstring>
#include "common/assert.h"
#include "core/crypto/ctr_encryption_layer.h"
@ -10,8 +11,7 @@ namespace Core::Crypto {
CTREncryptionLayer::CTREncryptionLayer(FileSys::VirtualFile base_, Key128 key_,
std::size_t base_offset)
: EncryptionLayer(std::move(base_)), base_offset(base_offset), cipher(key_, Mode::CTR),
iv(16, 0) {}
: EncryptionLayer(std::move(base_)), base_offset(base_offset), cipher(key_, Mode::CTR) {}
std::size_t CTREncryptionLayer::Read(u8* data, std::size_t length, std::size_t offset) const {
if (length == 0)
@ -39,9 +39,8 @@ std::size_t CTREncryptionLayer::Read(u8* data, std::size_t length, std::size_t o
return read + Read(data + read, length - read, offset + read);
}
void CTREncryptionLayer::SetIV(const std::vector<u8>& iv_) {
const auto length = std::min(iv_.size(), iv.size());
iv.assign(iv_.cbegin(), iv_.cbegin() + length);
void CTREncryptionLayer::SetIV(const IVData& iv_) {
iv = iv_;
}
void CTREncryptionLayer::UpdateIV(std::size_t offset) const {