Thanks, Jeff. I'll be testing it and trying to use over bytes, not
archives, then let's se what we get. I report any success or failure.
Thanks a lot,
Douglas
Jeffrey Walton escreveu:
>Hi Douglas,
>
>Let's try and get you moving... I took the following from Crypto++ 5.2.1.
>
>Jeff
>
>************************************************
>************************************************
>>From Usage (actually, usage.dat):
>
>- To secret share a file (shares will be named file.000, file.001, etc)
> cryptest ss threshold number-of-shares file
>
>- To reconstruct a secret-shared file
> cryptest sr file share1 share2 [....]
> (number of shares given must be equal to threshold)
>
>- To information disperse a file (shares will be named file.000, file.001, etc)
> cryptest id threshold number-of-shares file
>
>- To reconstruct an information-dispersed file
> cryptest ir file share1 share2 [....]
> (number of shares given must be equal to threshold)
>
>************************************************
>************************************************
>And the functions. See test.cpp, lines 491-592
>
>************************************************
>void SecretShareFile(int threshold, int nShares, const char *filename, const
>char *seed)
>{
> assert(nShares<=1000);
>
> RandomPool rng;
> rng.Put((byte *)seed, strlen(seed));
>
> ChannelSwitch *channelSwitch;
> FileSource source(filename, false, new SecretSharing(rng, threshold,
> nShares, channelSwitch = new ChannelSwitch));
>
> vector_member_ptrs<FileSink> fileSinks(nShares);
> string channel;
> for (int i=0; i<nShares; i++)
> {
> char extension[5] = ".000";
> extension[1]='0'+byte(i/100);
> extension[2]='0'+byte((i/10)%10);
> extension[3]='0'+byte(i%10);
> fileSinks[i].reset(new FileSink((string(filename)+extension).c_str()));
>
> channel = WordToString<word32>(i);
> fileSinks[i]->Put((byte *)channel.data(), 4);
> channelSwitch->AddRoute(channel, *fileSinks[i],
> BufferedTransformation::NULL_CHANNEL);
> }
>
> source.PumpAll();
>}
>
>************************************************
>void SecretRecoverFile(int threshold, const char *outFilename, char *const
>*inFilenames)
>{
> assert(threshold<=1000);
>
> SecretRecovery recovery(threshold, new FileSink(outFilename));
>
> vector_member_ptrs<FileSource> fileSources(threshold);
> SecByteBlock channel(4);
> int i;
> for (i=0; i<threshold; i++)
> {
> fileSources[i].reset(new FileSource(inFilenames[i], false));
> fileSources[i]->Pump(4);
> fileSources[i]->Get(channel, 4);
> fileSources[i]->Attach(new ChannelSwitch(recovery, string((char
> *)channel.begin(), 4)));
> }
>
> while (fileSources[0]->Pump(256))
> for (i=1; i<threshold; i++)
> fileSources[i]->Pump(256);
>
> for (i=0; i<threshold; i++)
> fileSources[i]->PumpAll();
>}
>
>************************************************
>void InformationDisperseFile(int threshold, int nShares, const char *filename)
>{
> assert(nShares<=1000);
>
> ChannelSwitch *channelSwitch;
> FileSource source(filename, false, new InformationDispersal(threshold,
> nShares, channelSwitch = new ChannelSwitch));
>
> vector_member_ptrs<FileSink> fileSinks(nShares);
> string channel;
> for (int i=0; i<nShares; i++)
> {
> char extension[5] = ".000";
> extension[1]='0'+byte(i/100);
> extension[2]='0'+byte((i/10)%10);
> extension[3]='0'+byte(i%10);
> fileSinks[i].reset(new FileSink((string(filename)+extension).c_str()));
>
> channel = WordToString<word32>(i);
> fileSinks[i]->Put((byte *)channel.data(), 4);
> channelSwitch->AddRoute(channel, *fileSinks[i],
> BufferedTransformation::NULL_CHANNEL);
> }
>
> source.PumpAll();
>}
>
>************************************************
>void InformationRecoverFile(int threshold, const char *outFilename, char
>*const *inFilenames)
>{
> assert(threshold<=1000);
>
> InformationRecovery recovery(threshold, new FileSink(outFilename));
>
> vector_member_ptrs<FileSource> fileSources(threshold);
> SecByteBlock channel(4);
> int i;
> for (i=0; i<threshold; i++)
> {
> fileSources[i].reset(new FileSource(inFilenames[i], false));
> fileSources[i]->Pump(4);
> fileSources[i]->Get(channel, 4);
> fileSources[i]->Attach(new ChannelSwitch(recovery, string((char
> *)channel.begin(), 4)));
> }
>
> while (fileSources[0]->Pump(256))
> for (i=1; i<threshold; i++)
> fileSources[i]->Pump(256);
>
> for (i=0; i<threshold; i++)
> fileSources[i]->PumpAll();
>}
>
>
>
>
_______________________________________________________
Promoção Yahoo! Acesso Grátis: a cada hora navegada você acumula cupons e
concorre a mais de 500 prêmios! Participe! http://yahoo.fbiz.com.br/
