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();
}
int cServer::Init(short a_ListenPort, short a_ConnectPort)
{
m_ConnectPort = a_ConnectPort;
WSAData wsa;
int res = WSAStartup(0x0202, &wsa);
if (res != 0)
{
printf("Cannot initialize WinSock: %d\n", res);
return res;
}
printf("Generating protocol encryption keypair...\n");
time_t CurTime = time(NULL);
RandomPool rng;
rng.Put((const byte *)&CurTime, sizeof(CurTime));
m_PrivateKey.GenerateRandomWithKeySize(rng, 1024);
RSA::PublicKey pk(m_PrivateKey);
m_PublicKey = pk;
m_ListenSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
sockaddr_in local;
memset(&local, 0, sizeof(local));
local.sin_family = AF_INET;
local.sin_addr.s_addr = 0; // All interfaces
local.sin_port = htons(a_ListenPort);
bind(m_ListenSocket, (sockaddr *)&local, sizeof(local));
listen(m_ListenSocket, 1);
printf("Listening on port %d, connecting to localhost:%d\n", a_ListenPort, a_ConnectPort);
return 0;
}
string RSAEncryptString(const char *pubFilename, const char *seed, const char *message)
{
FileSource pubFile(pubFilename, true, new HexDecoder);
RSAES_OAEP_SHA_Encryptor pub(pubFile);
RandomPool randPool;
randPool.Put((byte *)seed, strlen(seed));
string result;
StringSource(message, true, new PK_EncryptorFilter(randPool, pub, new HexEncoder(new StringSink(result))));
return result;
}
void GenerateRSAKey(unsigned int keyLength, const char *privFilename, const char *pubFilename, const char *seed)
{
RandomPool randPool;
randPool.Put((byte *)seed, strlen(seed));
RSAES_PKCS1v15_Decryptor priv(randPool, keyLength);
FileSink privFile(privFilename);
priv.DEREncode(privFile);
privFile.MessageEnd();
RSAES_PKCS1v15_Encryptor pub(priv);
FileSink pubFile(pubFilename);
pub.DEREncode(pubFile);
pubFile.MessageEnd();
}
