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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "crypto/aes_ctr.h"
#include <array>
#include <vector>
#include "base/check_op.h"
#include "base/containers/span.h"
#include "third_party/boringssl/src/include/openssl/aes.h"
namespace crypto::aes_ctr {
namespace {
void DoCTR(base::span<const uint8_t> key,
base::span<const uint8_t, kCounterSize> counter,
base::span<const uint8_t> in,
base::span<uint8_t> out) {
AES_KEY aes_key;
CHECK_EQ(AES_set_encrypt_key(key.data(), key.size() * 8, &aes_key), 0);
std::array<uint8_t, kCounterSize> ignored_counter_copy;
std::array<uint8_t, AES_BLOCK_SIZE> ignored_out_ctr;
unsigned int ignored_offset = 0;
base::span(ignored_counter_copy).copy_from(counter);
AES_ctr128_encrypt(in.data(), out.data(), in.size(), &aes_key,
ignored_counter_copy.data(), ignored_out_ctr.data(),
&ignored_offset);
}
} // namespace
void Encrypt(base::span<const uint8_t> key,
base::span<const uint8_t, kCounterSize> counter,
base::span<const uint8_t> in,
base::span<uint8_t> out) {
DoCTR(key, counter, in, out);
}
void Decrypt(base::span<const uint8_t> key,
base::span<const uint8_t, kCounterSize> counter,
base::span<const uint8_t> in,
base::span<uint8_t> out) {
DoCTR(key, counter, in, out);
}
std::vector<uint8_t> Encrypt(base::span<const uint8_t> key,
base::span<const uint8_t, kCounterSize> counter,
base::span<const uint8_t> in) {
std::vector<uint8_t> out(in.size());
Encrypt(key, counter, in, out);
return out;
}
std::vector<uint8_t> Decrypt(base::span<const uint8_t> key,
base::span<const uint8_t, kCounterSize> counter,
base::span<const uint8_t> in) {
std::vector<uint8_t> out(in.size());
Decrypt(key, counter, in, out);
return out;
}
} // namespace crypto::aes_ctr
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