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// Crypto/ZipCipher.h
#include "StdAfx.h"
#include "ZipCipher.h"
#include "Windows/Defs.h"
#include "../../Common/StreamUtils.h"
#include "../Hash/RandGen.h"
namespace NCrypto {
namespace NZip {
STDMETHODIMP CEncoder::CryptoSetPassword(const Byte *data, UInt32 size)
{
_cipher.SetPassword(data, size);
return S_OK;
}
STDMETHODIMP CEncoder::CryptoSetCRC(UInt32 crc)
{
_crc = crc;
return S_OK;
}
STDMETHODIMP CEncoder::Init()
{
return S_OK;
}
HRESULT CEncoder::WriteHeader(ISequentialOutStream *outStream)
{
Byte header[kHeaderSize];
g_RandomGenerator.Generate(header, kHeaderSize - 2);
header[kHeaderSize - 1] = Byte(_crc >> 24);
header[kHeaderSize - 2] = Byte(_crc >> 16);
_cipher.EncryptHeader(header);
return WriteStream(outStream, header, kHeaderSize);
}
STDMETHODIMP_(UInt32) CEncoder::Filter(Byte *data, UInt32 size)
{
UInt32 i;
for (i = 0; i < size; i++)
data[i] = _cipher.EncryptByte(data[i]);
return i;
}
STDMETHODIMP CDecoder::CryptoSetPassword(const Byte *data, UInt32 size)
{
_cipher.SetPassword(data, size);
return S_OK;
}
HRESULT CDecoder::ReadHeader(ISequentialInStream *inStream)
{
Byte header[kHeaderSize];
RINOK(ReadStream_FAIL(inStream, header, kHeaderSize));
_cipher.DecryptHeader(header);
return S_OK;
}
STDMETHODIMP CDecoder::Init()
{
return S_OK;
}
STDMETHODIMP_(UInt32) CDecoder::Filter(Byte *data, UInt32 size)
{
UInt32 i;
for (i = 0; i < size; i++)
data[i] = _cipher.DecryptByte(data[i]);
return i;
}
}}
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