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// Copyright Epic Games, Inc. All Rights Reserved.
#include <zencore/crypto.h>
#include <zencore/intmath.h>
#include <zencore/testing.h>
#include <openssl/conf.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <string>
#include <string_view>
#if ZEN_PLATFORM_WINDOWS
# pragma comment(lib, "crypt32.lib")
# pragma comment(lib, "ws2_32.lib")
#endif
namespace zen {
class NullCipher final : public SymmetricCipher
{
public:
NullCipher() = default;
virtual ~NullCipher() = default;
virtual bool Initialize(MemoryView, MemoryView) override final { return true; }
virtual CipherSettings Settings() override final { return {}; }
virtual MemoryView Encrypt(MemoryView Data, MutableMemoryView) override final { return Data; }
virtual MemoryView Decrypt(MemoryView Data, MutableMemoryView) override final { return Data; }
};
std::unique_ptr<SymmetricCipher>
MakeNullCipher()
{
return std::make_unique<NullCipher>();
}
#if ZEN_PLATFORM_WINDOWS
class Aes final : public SymmetricCipher
{
public:
Aes(const EVP_CIPHER* Cipher = EVP_aes_256_cbc()) : m_Cipher(Cipher)
{
ZEN_ASSERT(Cipher);
m_KeySize = static_cast<size_t>(EVP_CIPHER_key_length(m_Cipher));
m_InitVectorSize = static_cast<size_t>(EVP_CIPHER_iv_length(m_Cipher));
m_BlockSize = static_cast<size_t>(EVP_CIPHER_block_size(m_Cipher));
}
virtual ~Aes()
{
if (m_EncryptionCtx)
{
EVP_CIPHER_CTX_free(m_EncryptionCtx);
}
if (m_DecryptionCtx)
{
EVP_CIPHER_CTX_free(m_DecryptionCtx);
}
}
virtual bool Initialize(MemoryView Key, MemoryView InitVector) override final
{
ZEN_ASSERT(m_EncryptionCtx == nullptr && m_DecryptionCtx == nullptr);
ZEN_ASSERT(Key.GetSize() == m_KeySize);
ZEN_ASSERT(InitVector.GetSize() == m_InitVectorSize);
m_EncryptionCtx = EVP_CIPHER_CTX_new();
m_DecryptionCtx = EVP_CIPHER_CTX_new();
if (int ErrorCode = EVP_EncryptInit_ex(m_EncryptionCtx,
m_Cipher,
nullptr,
reinterpret_cast<const unsigned char*>(Key.GetData()),
reinterpret_cast<const unsigned char*>(InitVector.GetData()));
ErrorCode != 1)
{
return false;
}
if (int ErrorCode = EVP_DecryptInit_ex(m_DecryptionCtx,
m_Cipher,
nullptr,
reinterpret_cast<const unsigned char*>(Key.GetData()),
reinterpret_cast<const unsigned char*>(InitVector.GetData()));
ErrorCode != 1)
{
return false;
}
return true;
}
virtual CipherSettings Settings() override final
{
return {.KeySize = m_KeySize, .InitVectorSize = m_InitVectorSize, .BlockSize = m_BlockSize};
}
virtual MemoryView Encrypt(MemoryView Data, MutableMemoryView EncryptionBuffer)
{
ZEN_ASSERT(m_EncryptionCtx);
const uint64_t InputSize = Data.GetSize();
const uint64_t NeededSize = RoundUp(InputSize, m_BlockSize);
if (NeededSize > EncryptionBuffer.GetSize())
{
return MemoryView();
}
int TotalSize = 0;
int EncryptedSize = 0;
int ErrorCode = EVP_EncryptUpdate(m_EncryptionCtx,
reinterpret_cast<unsigned char*>(EncryptionBuffer.GetData()),
&EncryptedSize,
reinterpret_cast<const unsigned char*>(Data.GetData()),
static_cast<int>(Data.GetSize()));
if (ErrorCode != 1)
{
return MemoryView();
}
TotalSize = EncryptedSize;
MutableMemoryView Remaining = EncryptionBuffer.RightChop(uint64_t(EncryptedSize));
ErrorCode = EVP_EncryptFinal_ex(m_EncryptionCtx, reinterpret_cast<unsigned char*>(Remaining.GetData()), &EncryptedSize);
if (ErrorCode != 1)
{
return MemoryView();
}
TotalSize += EncryptedSize;
return EncryptionBuffer.Left(uint64_t(TotalSize));
}
virtual MemoryView Decrypt(MemoryView Data, MutableMemoryView DecryptionBuffer) override final
{
ZEN_ASSERT(m_DecryptionCtx);
int TotalSize = 0;
int DecryptedSize = 0;
int ErrorCode = EVP_DecryptUpdate(m_DecryptionCtx,
reinterpret_cast<unsigned char*>(DecryptionBuffer.GetData()),
&DecryptedSize,
reinterpret_cast<const unsigned char*>(Data.GetData()),
static_cast<int>(Data.GetSize()));
if (ErrorCode != 1)
{
return MemoryView();
}
TotalSize = DecryptedSize;
MutableMemoryView Remaining = DecryptionBuffer.RightChop(uint64_t(DecryptedSize));
ErrorCode = EVP_DecryptFinal_ex(m_DecryptionCtx, reinterpret_cast<unsigned char*>(Remaining.GetData()), &DecryptedSize);
TotalSize += DecryptedSize;
return DecryptionBuffer.Left(uint64_t(TotalSize));
}
private:
const EVP_CIPHER* m_Cipher = nullptr;
EVP_CIPHER_CTX* m_EncryptionCtx = nullptr;
EVP_CIPHER_CTX* m_DecryptionCtx = nullptr;
size_t m_BlockSize = 0;
size_t m_KeySize = 0;
size_t m_InitVectorSize = 0;
};
std::unique_ptr<SymmetricCipher>
MakeAesCipher()
{
return std::make_unique<Aes>();
}
#endif // ZEN_PLATFORM_WINDOWS
#if ZEN_WITH_TESTS
using namespace std::literals;
void
crypto_forcelink()
{
}
TEST_CASE("crypto.aes")
{
SUBCASE("basic")
{
# if ZEN_PLATFORM_WINDOWS
auto Cipher = std::make_unique<Aes>();
std::string_view PlainText = "The quick brown fox jumps over the lazy dog"sv;
std::vector<uint8_t> Key = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31};
std::vector<uint8_t> Seed = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
std::vector<uint8_t> EncryptionBuffer;
std::vector<uint8_t> DecryptionBuffer;
bool Ok = Cipher->Initialize(MakeMemoryView(Key), MakeMemoryView(Seed));
CHECK(Ok);
EncryptionBuffer.resize(PlainText.size() + Cipher->Settings().BlockSize);
DecryptionBuffer.resize(PlainText.size() + Cipher->Settings().BlockSize);
MemoryView EncryptedView = Cipher->Encrypt(MakeMemoryView(PlainText), MakeMutableMemoryView(EncryptionBuffer));
CHECK(EncryptedView.IsEmpty() == false);
MemoryView DecryptedView = Cipher->Decrypt(EncryptedView, MakeMutableMemoryView(DecryptionBuffer));
CHECK(DecryptedView.IsEmpty() == false);
std::string_view EncryptedDecryptedText =
std::string_view(reinterpret_cast<const char*>(DecryptedView.GetData()), DecryptedView.GetSize());
CHECK(EncryptedDecryptedText == PlainText);
}
# endif
}
#endif
} // namespace zen
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