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CryptHelpers.cpp
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CryptHelpers.cpp
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#include "global.h"
#include "CryptHelpers.h"
#include "RageFile.h"
#include "RageUtil.h"
#include "RageLog.h"
// crypt headers
#include "crypto51/files.h"
#include "crypto51/filters.h"
#include "crypto51/cryptlib.h"
#include "crypto51/files.h"
#include "crypto51/sha.h"
#include "crypto51/rsa.h"
#include "crypto51/osrng.h"
using namespace CryptoPP;
class RageFileStore : public Store, private FilterPutSpaceHelper
{
public:
class Err : public Exception
{
public:
Err(const std::string &s) : Exception(IO_ERROR, s) {}
};
class OpenErr : public Err {public: OpenErr(const std::string &filename) : Err("FileStore: error opening file for reading: " + filename) {}};
struct ReadErr : public Err { ReadErr( const RageFileBasic &f ); };
RageFileStore( RageFileBasic *pFile ); /* pFile will be deleted */
~RageFileStore();
RageFileStore( const RageFileStore &cpy );
RageFileStore(const char *filename)
{StoreInitialize(MakeParameters("InputFileName", filename));}
unsigned long MaxRetrievable() const;
unsigned int TransferTo2(BufferedTransformation &target, unsigned long &transferBytes, const std::string &channel=NULL_CHANNEL, bool blocking=true);
unsigned int CopyRangeTo2(BufferedTransformation &target, unsigned long &begin, unsigned long end=ULONG_MAX, const std::string &channel=NULL_CHANNEL, bool blocking=true) const;
private:
void StoreInitialize(const NameValuePairs ¶meters);
mutable RageFileBasic *m_pFile; // mutable because reading from a file is not a const operation
byte *m_space;
int m_len;
bool m_waiting;
};
class RageFileSource : public SourceTemplate<RageFileStore>
{
public:
typedef FileStore::Err Err;
typedef FileStore::OpenErr OpenErr;
typedef FileStore::ReadErr ReadErr;
RageFileSource( RageFileBasic *pFile, bool pumpAll, BufferedTransformation *attachment = NULL, bool binary=true )
: SourceTemplate<RageFileStore>(attachment,RageFileStore(pFile)) {SourceInitialize(pumpAll, MakeParameters("InputBinaryMode", binary));}
};
RageFileStore::ReadErr::ReadErr( const RageFileBasic &f ):
Err( "RageFileStore read error: " + f.GetError() )
{
}
RageFileStore::RageFileStore( RageFileBasic *pFile )
{
m_pFile = pFile;
m_waiting = false;
}
RageFileStore::~RageFileStore()
{
delete m_pFile;
}
RageFileStore::RageFileStore( const RageFileStore &cpy ):
Store(cpy),
FilterPutSpaceHelper(cpy)
{
if( cpy.m_pFile != NULL )
m_pFile = cpy.m_pFile->Copy();
else
m_pFile = NULL;
ASSERT( !cpy.m_waiting );
m_waiting = false;
}
void RageFileStore::StoreInitialize(const NameValuePairs ¶meters)
{
ASSERT( m_pFile != NULL );
m_waiting = false;
}
unsigned long RageFileStore::MaxRetrievable() const
{
if( m_pFile == NULL || m_pFile->AtEOF() || !m_pFile->GetError().empty() )
return 0;
return m_pFile->GetFileSize() - m_pFile->Tell();
}
unsigned int RageFileStore::TransferTo2(BufferedTransformation &target, unsigned long &transferBytes, const std::string &channel, bool blocking)
{
if( m_pFile == NULL || m_pFile->AtEOF() || !m_pFile->GetError().empty() )
{
transferBytes = 0;
return 0;
}
unsigned long size=transferBytes;
transferBytes = 0;
if( m_waiting )
goto output;
while( size && !m_pFile->AtEOF() )
{
{
unsigned int spaceSize = 1024;
m_space = HelpCreatePutSpace(target, channel, 1, (unsigned int)STDMIN(size, (unsigned long)UINT_MAX), spaceSize);
m_len = m_pFile->Read( (char *)m_space, STDMIN(size, (unsigned long)spaceSize));
if( m_len == -1 )
throw ReadErr( *m_pFile );
}
unsigned int blockedBytes;
output:
blockedBytes = target.ChannelPutModifiable2(channel, m_space, m_len, 0, blocking);
m_waiting = blockedBytes > 0;
if( m_waiting )
return blockedBytes;
size -= m_len;
transferBytes += m_len;
}
return 0;
}
unsigned int RageFileStore::CopyRangeTo2(BufferedTransformation &target, unsigned long &begin, unsigned long end, const std::string &channel, bool blocking) const
{
if( m_pFile == NULL || m_pFile->AtEOF() || !m_pFile->GetError().empty() )
return 0;
if( begin == 0 && end == 1 )
{
int current = m_pFile->Tell();
byte result;
m_pFile->Read( &result, 1 );
m_pFile->Seek( current );
if( m_pFile->AtEOF() )
return 0;
unsigned int blockedBytes = target.ChannelPut( channel, byte(result), blocking );
begin += 1-blockedBytes;
return blockedBytes;
}
// TODO: figure out what happens on cin
// (What does that mean?)
int current = m_pFile->Tell();
int newPosition = current + (streamoff)begin;
if( newPosition >= m_pFile->GetFileSize() )
return 0; // don't try to seek beyond the end of file
m_pFile->Seek( newPosition );
try
{
ASSERT( !m_waiting );
unsigned long copyMax = end-begin;
unsigned int blockedBytes = const_cast<RageFileStore *>(this)->TransferTo2( target, copyMax, channel, blocking );
begin += copyMax;
if( blockedBytes )
{
const_cast<RageFileStore *>(this)->m_waiting = false;
return blockedBytes;
}
}
catch(...)
{
m_pFile->ClearError();
m_pFile->Seek( current );
throw;
}
m_pFile->ClearError();
m_pFile->Seek( current );
return 0;
}
bool CryptHelpers::GenerateRSAKey( unsigned int keyLength, CString sSeed, CString &sPublicKey, CString &sPrivateKey )
{
#ifdef _XBOX
return false;
#else
try
{
NonblockingRng rng;
RSASSA_PKCS1v15_SHA_Signer priv(rng, keyLength);
StringSink privFile( sPrivateKey );
priv.DEREncode(privFile);
privFile.MessageEnd();
RSASSA_PKCS1v15_SHA_Verifier pub(priv);
StringSink pubFile( sPublicKey );
pub.DEREncode(pubFile);
pubFile.MessageEnd();
} catch( const CryptoPP::Exception &s ) {
LOG->Warn( "GenerateRSAKey failed: %s", s.what() );
return false;
}
return true;
#endif
}
bool CryptHelpers::SignFile( RageFileBasic &file, CString sPrivKey, CString &sSignatureOut, CString &sError )
{
#ifdef _XBOX
return false;
#else
try {
StringSource privFile( sPrivKey, true );
RSASSA_PKCS1v15_SHA_Signer priv(privFile);
NonblockingRng rng;
/* RageFileSource will delete the file we give to it, so make a copy. */
RageFileSource f( file.Copy(), true, new SignerFilter(rng, priv, new StringSink(sSignatureOut)) );
} catch( const CryptoPP::Exception &s ) {
LOG->Warn( "SignFileToFile failed: %s", s.what() );
return false;
}
return true;
#endif
}
bool CryptHelpers::VerifyFile( RageFileBasic &file, CString sSignature, CString sPublicKey, CString &sError )
{
try {
StringSource pubFile( sPublicKey, true );
RSASSA_PKCS1v15_SHA_Verifier pub(pubFile);
if( sSignature.size() != pub.SignatureLength() )
{
sError = ssprintf( "Invalid signature length: got %i, expected %i", sSignature.size(), pub.SignatureLength() );
return false;
}
VerifierFilter *verifierFilter = new VerifierFilter(pub);
verifierFilter->Put( (byte *) sSignature.data(), sSignature.size() );
/* RageFileSource will delete the file we give to it, so make a copy. */
RageFileSource f( file.Copy(), true, verifierFilter );
if( !verifierFilter->GetLastResult() )
{
sError = ssprintf( "Signature mismatch" );
return false;
}
return true;
} catch( const CryptoPP::Exception &s ) {
sError = s.what();
return false;
}
}
/*
* (c) 2001-2004 Chris Danford
* All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, and/or sell copies of the Software, and to permit persons to
* whom the Software is furnished to do so, provided that the above
* copyright notice(s) and this permission notice appear in all copies of
* the Software and that both the above copyright notice(s) and this
* permission notice appear in supporting documentation.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF
* THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS
* INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT
* OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
* OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/