我正在使用Crypto ++的SecretSharing类。我想将份额(假设是n个份额)除以SecretSharing划分为n个字符串对象，然后输出结果。但是我的程序总是抛出异常。我该如何避免呢？
#include<iostream>//using cout、cin
#include<filters.h>
#include<files.h>
#include<osrng.h>
#include<ida.h>
#include<channels.h>
#include<randpool.h>
#include<string>
#include<hex.h>
using namespace std;
using namespace CryptoPP;
int main()
{
try
{
AutoSeededRandomPool rng;
string message = "I like Cryptopgraphy.";
string Share1,Share2,Share3,Share4,tmp;
StringSink S1(Share1);
StringSink S2(Share2);
StringSink S3(Share3);
StringSink S4(Share4);
ChannelSwitch* channelSwitch = new ChannelSwitch;
channelSwitch->AddDefaultRoute(S1);
channelSwitch->AddDefaultRoute(S2);
channelSwitch->AddDefaultRoute(S3);
channelSwitch->AddDefaultRoute(S4);
StringSource Src(message,true,new SecretSharing(rng,2,4,channelSwitch));
cout << "Share1:" << Share1 << endl;
cout << "Share2:" << Share2 << endl;
cout << "Share3:" << Share3 << endl;
cout << "Share4:" << Share4 << endl;
}
catch(const Exception& e)
{
cout << e.what() << endl;
}
return 0;
}
异常(exception)是:
unknown: this object doesn't support multiple channels*
我还有一个与
ChannelSwitch相关的SecretSharing的问题。Crypto ++的手册说:“ChannelSwitch可以基于通道ID将输入路由到不同和/或多个通道。”
谁能给我一些有关上述问题的例子。
最佳答案
我找到了这些代码，但我不理解某些代码的含义。
例如，以下代码。
while (strSources[0]->Pump(256))
{
for (unsigned int i=1; i<threshold; i++)
strSources[i]->Pump(256);
}
for (unsigned int i=0; i<threshold; i++)
strSources[i]->PumpAll();
为什么要让每个源泵每次都提供256个字节？为什么不让他们一次抽取所有数据？
// Information Dispesal and Secret Sharing
bool TestSharing()
{
std::cout << "\nInformation Dispersal and Secret Sharing...\n\n";
static const unsigned int INFORMATION_SHARES = 128;
static const unsigned int SECRET_SHARES = 64;
static const unsigned int CHID_LENGTH = 4;
bool pass=true, fail=false;
// ********** Infrmation Dispersal **********//
for (unsigned int shares=3; shares<INFORMATION_SHARES; ++shares)
{
std::string message;
unsigned int len = GlobalRNG().GenerateWord32(4, 0xff);
unsigned int threshold = GlobalRNG().GenerateWord32(2, shares-1);
RandomNumberSource(GlobalRNG(), len, true, new StringSink(message));
ChannelSwitch *channelSwitch = NULLPTR;
StringSource source(message, false, new InformationDispersal(threshold,
shares, channelSwitch = new ChannelSwitch));
std::vector<std::string> strShares(shares);
vector_member_ptrs<StringSink> strSinks(shares);
std::string channel;
// ********** Create Shares
for (unsigned int i=0; i<shares; i++)
{
strSinks[i].reset(new StringSink(strShares[i]));
channel = WordToString<word32>(i);
strSinks[i]->Put((const byte *)channel.data(), CHID_LENGTH);
channelSwitch->AddRoute(channel, *strSinks[i], DEFAULT_CHANNEL);
}
source.PumpAll();
// ********** Randomize shares
GlobalRNG().Shuffle(strShares.begin(), strShares.end());
// ********** Recover secret
try
{
std::string recovered;
InformationRecovery recovery(threshold, new StringSink(recovered));
vector_member_ptrs<StringSource> strSources(threshold);
channel.resize(CHID_LENGTH);
for (unsigned int i=0; i<threshold; i++)
{
strSources[i].reset(new StringSource(strShares[i], false));
strSources[i]->Pump(CHID_LENGTH);
strSources[i]->Get((byte*)&channel[0], CHID_LENGTH);
strSources[i]->Attach(new ChannelSwitch(recovery, channel));
}
while (strSources[0]->Pump(256))
{
for (unsigned int i=1; i<threshold; i++)
strSources[i]->Pump(256);
}
for (unsigned int i=0; i<threshold; i++)
strSources[i]->PumpAll();
fail = (message != recovered);
}
catch (const Exception&)
{
fail = true;
}
pass &= !fail;
}
std::cout << (fail ? "FAILED:" : "passed:") << " " << INFORMATION_SHARES << "
information dispersals\n";
// ********** Secret Sharing **********//
for (unsigned int shares=3; shares<SECRET_SHARES; ++shares)
{
std::string message;
unsigned int len = GlobalRNG().GenerateWord32(4, 0xff);
unsigned int threshold = GlobalRNG().GenerateWord32(2, shares-1);
RandomNumberSource(GlobalRNG(), len, true, new StringSink(message));
ChannelSwitch *channelSwitch = NULLPTR;
StringSource source(message, false, new SecretSharing(GlobalRNG(),
threshold, shares, channelSwitch = new ChannelSwitch));
std::vector<std::string> strShares(shares);
vector_member_ptrs<StringSink> strSinks(shares);
std::string channel;
// ********** Create Shares
for (unsigned int i=0; i<shares; i++)
{
strSinks[i].reset(new StringSink(strShares[i]));
channel = WordToString<word32>(i);
strSinks[i]->Put((const byte *)channel.data(), CHID_LENGTH);
channelSwitch->AddRoute(channel, *strSinks[i], DEFAULT_CHANNEL);
}
source.PumpAll();
// ********** Randomize shares
GlobalRNG().Shuffle(strShares.begin(), strShares.end());
// ********** Recover secret
try
{
std::string recovered;
SecretRecovery recovery(threshold, new StringSink(recovered));
vector_member_ptrs<StringSource> strSources(threshold);
channel.resize(CHID_LENGTH);
for (unsigned int i=0; i<threshold; i++)
{
strSources[i].reset(new StringSource(strShares[i], false));
strSources[i]->Pump(CHID_LENGTH);
strSources[i]->Get((byte*)&channel[0], CHID_LENGTH);
strSources[i]->Attach(new ChannelSwitch(recovery, channel));
}
while (strSources[0]->Pump(256))
{
for (unsigned int i=1; i<threshold; i++)
strSources[i]->Pump(256);
}
for (unsigned int i=0; i<threshold; i++)
strSources[i]->PumpAll();
fail = (message != recovered);
}
catch (const Exception&)
{
fail = true;
}
pass &= !fail;
}
std::cout << (fail ? "FAILED:" : "passed:") << " " << SECRET_SHARES << "
secret sharings\n";
return pass;
}
关于c++ - 未知:使用SecretSharing时，此对象不支持多个 channel ，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/53478054/