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Core/Crypto: Allow different AES key lengths

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This commit is contained in:
Shauren
2024-12-18 22:28:34 +01:00
parent 51344bc671
commit f8f7fb58cb
2 changed files with 32 additions and 3 deletions
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27
src/common/Cryptography/AES.cpp
View File

@@ -19,10 +19,26 @@
#include "Errors.h"
#include <limits>
Trinity::Crypto::AES::AES(bool encrypting) : _ctx(EVP_CIPHER_CTX_new()), _encrypting(encrypting)
Trinity::Crypto::AES::AES(bool encrypting, size_t keySizeBits /*= 128*/) : _ctx(EVP_CIPHER_CTX_new()), _encrypting(encrypting)
{
EVP_CIPHER_CTX_init(_ctx);
int status = EVP_CipherInit_ex(_ctx, EVP_aes_128_gcm(), nullptr, nullptr, nullptr, _encrypting ? 1 : 0);
EVP_CIPHER const* cipher = nullptr;
switch (keySizeBits)
{
case 128:
cipher = EVP_aes_128_gcm();
break;
case 192:
cipher = EVP_aes_192_gcm();
break;
case 256:
cipher = EVP_aes_256_gcm();
break;
default:
ASSERT(false, "Invalid AES key size " SZFMTD, keySizeBits);
}
int status = EVP_CipherInit_ex(_ctx, cipher, nullptr, nullptr, nullptr, _encrypting ? 1 : 0);
ASSERT(status);
}
@@ -37,6 +53,13 @@ void Trinity::Crypto::AES::Init(Key const& key)
ASSERT(status);
}
void Trinity::Crypto::AES::Init(std::span<uint8 const> key)
{
ASSERT(key.size() == size_t(EVP_CIPHER_CTX_get_key_length(_ctx)));
int status = EVP_CipherInit_ex(_ctx, nullptr, nullptr, key.data(), nullptr, -1);
ASSERT(status);
}
bool Trinity::Crypto::AES::Process(IV const& iv, uint8* data, size_t length, Tag& tag)
{
ASSERT(length <= static_cast<size_t>(std::numeric_limits<int>::max()));

8
src/common/Cryptography/AES.h
View File

@@ -20,6 +20,7 @@
#include "Define.h"
#include <array>
#include <span>
#include <openssl/evp.h>
namespace Trinity::Crypto
@@ -35,10 +36,15 @@ namespace Trinity::Crypto
using Key = std::array<uint8, KEY_SIZE_BYTES>;
using Tag = uint8[TAG_SIZE_BYTES];
AES(bool encrypting);
AES(bool encrypting, size_t keySizeBits = 128);
AES(AES const&) = delete;
AES(AES&&) = delete;
AES& operator=(AES const&) = delete;
AES& operator=(AES&&) = delete;
~AES();
void Init(Key const& key);
void Init(std::span<uint8 const> key);
bool Process(IV const& iv, uint8* data, size_t length, Tag& tag);
bool ProcessNoIntegrityCheck(IV const& iv, uint8* data, size_t partialLength);