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// Crypto/MyAes.cpp
#include "StdAfx.h"
#include "../../../C/CpuArch.h"
#include "MyAes.h"
namespace NCrypto {
static struct CAesTabInit { CAesTabInit() { AesGenTables();} } g_AesTabInit;
CAesCoder::CAesCoder(bool encodeMode, unsigned keySize, bool ctrMode):
_keySize(keySize),
_keyIsSet(false),
_encodeMode(encodeMode),
_ctrMode(ctrMode),
_aes(AES_NUM_IVMRK_WORDS * 4 + AES_BLOCK_SIZE * 2)
{
// _offset = ((0 - (unsigned)(ptrdiff_t)_aes) & 0xF) / sizeof(UInt32);
memset(_iv, 0, AES_BLOCK_SIZE);
/*
// we can use the following code to test 32-bit overflow case for AES-CTR
for (unsigned i = 0; i < 16; i++) _iv[i] = (Byte)(i + 1);
_iv[0] = 0xFE; _iv[1] = _iv[2] = _iv[3] = 0xFF;
*/
SetFunctions(0);
}
STDMETHODIMP CAesCoder::Init()
{
AesCbc_Init(Aes(), _iv);
return _keyIsSet ? S_OK : E_NOTIMPL; // E_FAIL
}
STDMETHODIMP_(UInt32) CAesCoder::Filter(Byte *data, UInt32 size)
{
if (!_keyIsSet)
return 0;
if (size == 0)
return 0;
if (size < AES_BLOCK_SIZE)
{
#ifndef _SFX
if (_ctrMode)
{
// use that code only for last block !!!
Byte *ctr = (Byte *)(Aes() + AES_NUM_IVMRK_WORDS);
memset(ctr, 0, AES_BLOCK_SIZE);
memcpy(ctr, data, size);
_codeFunc(Aes(), ctr, 1);
memcpy(data, ctr, size);
return size;
}
#endif
return AES_BLOCK_SIZE;
}
size >>= 4;
_codeFunc(Aes(), data, size);
return size << 4;
}
STDMETHODIMP CAesCoder::SetKey(const Byte *data, UInt32 size)
{
if ((size & 0x7) != 0 || size < 16 || size > 32)
return E_INVALIDARG;
if (_keySize != 0 && size != _keySize)
return E_INVALIDARG;
AES_SET_KEY_FUNC setKeyFunc = (_ctrMode | _encodeMode) ? Aes_SetKey_Enc : Aes_SetKey_Dec;
setKeyFunc(Aes() + 4, data, size);
_keyIsSet = true;
return S_OK;
}
STDMETHODIMP CAesCoder::SetInitVector(const Byte *data, UInt32 size)
{
if (size != AES_BLOCK_SIZE)
return E_INVALIDARG;
memcpy(_iv, data, size);
CAesCoder::Init(); // don't call virtual function here !!!
return S_OK;
}
#ifndef _SFX
#ifdef MY_CPU_X86_OR_AMD64
#define USE_HW_AES
#elif defined(MY_CPU_ARM_OR_ARM64) && defined(MY_CPU_LE)
#if defined(__clang__)
#if (__clang_major__ >= 8) // fix that check
#define USE_HW_AES
#endif
#elif defined(__GNUC__)
#if (__GNUC__ >= 6) // fix that check
#define USE_HW_AES
#endif
#elif defined(_MSC_VER)
#if _MSC_VER >= 1910
#define USE_HW_AES
#endif
#endif
#endif
#endif
bool CAesCoder::SetFunctions(UInt32
#ifndef _SFX
algo
#endif
)
{
_codeFunc = g_AesCbc_Decode;
#ifdef _SFX
return true;
#else
if (_ctrMode)
_codeFunc = g_AesCtr_Code;
else if (_encodeMode)
_codeFunc = g_AesCbc_Encode;
if (algo < 1)
return true;
if (algo == 1)
{
_codeFunc = AesCbc_Decode;
#ifndef _SFX
if (_ctrMode)
_codeFunc = AesCtr_Code;
else if (_encodeMode)
_codeFunc = AesCbc_Encode;
#endif
return true;
}
#ifdef USE_HW_AES
// if (CPU_IsSupported_AES())
{
if (algo == 2)
if (g_Aes_SupportedFunctions_Flags & k_Aes_SupportedFunctions_HW)
{
_codeFunc = AesCbc_Decode_HW;
#ifndef _SFX
if (_ctrMode)
_codeFunc = AesCtr_Code_HW;
else if (_encodeMode)
_codeFunc = AesCbc_Encode_HW;
#endif
return true;
}
#if defined(MY_CPU_X86_OR_AMD64)
if (algo == 3)
if (g_Aes_SupportedFunctions_Flags & k_Aes_SupportedFunctions_HW_256)
{
_codeFunc = AesCbc_Decode_HW_256;
#ifndef _SFX
if (_ctrMode)
_codeFunc = AesCtr_Code_HW_256;
else if (_encodeMode)
_codeFunc = AesCbc_Encode_HW;
#endif
return true;
}
#endif
}
#endif
return false;
#endif
}
#ifndef _SFX
STDMETHODIMP CAesCoder::SetCoderProperties(const PROPID *propIDs, const PROPVARIANT *coderProps, UInt32 numProps)
{
UInt32 algo = 0;
for (UInt32 i = 0; i < numProps; i++)
{
const PROPVARIANT &prop = coderProps[i];
if (propIDs[i] == NCoderPropID::kDefaultProp)
{
if (prop.vt != VT_UI4)
return E_INVALIDARG;
if (prop.ulVal > 3)
return E_NOTIMPL;
algo = prop.ulVal;
}
}
if (!SetFunctions(algo))
return E_NOTIMPL;
return S_OK;
}
#endif
}
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