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// Crypto/MyAes.cpp
#include "StdAfx.h"
#include "MyAes.h"
namespace NCrypto {
struct CAesTabInit { CAesTabInit() { AesGenTables();} } g_AesTabInit;
CAesCbcCoder::CAesCbcCoder()
{
_offset = ((0 - (unsigned)(ptrdiff_t)_aes) & 0xF) / sizeof(UInt32);
}
STDMETHODIMP CAesCbcCoder::Init() { return S_OK; }
STDMETHODIMP_(UInt32) CAesCbcCoder::Filter(Byte *data, UInt32 size)
{
if (size == 0)
return 0;
if (size < AES_BLOCK_SIZE)
return AES_BLOCK_SIZE;
size >>= 4;
_codeFunc(_aes + _offset, data, size);
return size << 4;
}
STDMETHODIMP CAesCbcCoder::SetKey(const Byte *data, UInt32 size)
{
if ((size & 0x7) != 0 || size < 16 || size > 32)
return E_INVALIDARG;
_setKeyFunc(_aes + _offset + 4, data, size);
return S_OK;
}
STDMETHODIMP CAesCbcCoder::SetInitVector(const Byte *data, UInt32 size)
{
if (size != AES_BLOCK_SIZE)
return E_INVALIDARG;
AesCbc_Init(_aes + _offset, data);
return S_OK;
}
CAesCbcEncoder::CAesCbcEncoder() { _codeFunc = g_AesCbc_Encode; _setKeyFunc = Aes_SetKey_Enc; }
CAesCbcDecoder::CAesCbcDecoder() { _codeFunc = g_AesCbc_Decode; _setKeyFunc = Aes_SetKey_Dec; }
}
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