/** Do the initialization - especially create a random seed and get your own PeerID
* Must be called first.
* Gets the name of this peer (for example "Ulrich Norbisrath's peer") and the public key */
F2FPeer * f2fInit( const F2FString myName, const F2FString myPublicKey )
{
#define MAXBUFFERSIZE 1024
char buffer[MAXBUFFERSIZE+1]; // Buffer for concatenation of name and key
buffer [MAXBUFFERSIZE]=0; // Make sure this is 0 terminated
F2FSize buffersize;
F2FWord32 seeds[ MT_STATE_SIZE ];
// First create the seed for the mersenne twister
srand( time(NULL) ); // Initialize the poor randomizer of C itself
// copy name and publickey in buffer (this copy should be secure)
strncpy( buffer, myName, MAXBUFFERSIZE );
buffersize = strlen( buffer );
strncpy( buffer + buffersize, myPublicKey, MAXBUFFERSIZE - buffersize );
buffersize = strlen( buffer );
if (buffersize < 4) // not enough data to create seed
{
globalError = F2FErrNotEnoughSeed;
return NULL;
}
// iterate over seed
int seedCell;
for (seedCell = 0; seedCell < MT_STATE_SIZE; ++seedCell)
{
// Xor a random number with a random 4 byte pair out of th ebuffer
seeds[ seedCell ] = rand() ^ *( (F2FWord32 *) (buffer + ( rand()%(buffersize-3) ) ) );
}
mts_seedfull( &randomnessState, seeds ); // activate the seed
/* Create a new peer with random uid */
F2FPeer *newpeer = f2fPeerListNew( mts_lrand( &randomnessState ), mts_lrand( &randomnessState ) );
if (newpeer == NULL)
{
globalError = F2FErrListFull;
return NULL;
}
/* initialize buffers */
sendBuffer.size = 0;
/* Init was successfull */
initWasCalled = 1;
myself = newpeer;
myself->activeprovider = F2FProviderMyself;
return newpeer;
}
/*
* Initialize a Mersenne Twist RNG from a 624-int seed.
*
* See mts_seedfull for full commentary.
*/
void mt_seedfull(
uint32_t seeds[MT_STATE_SIZE])
{
mts_seedfull(&mt_default_state, seeds);
}
/*
* Initialize a Mersenne Twist RNG from a 624-long seed.
*
* See mts_seedfull for full commentary.
*/
void mt_seedfull(
unsigned long seeds[MT_STATE_SIZE])
{
mts_seedfull(&mt_default_state, seeds);
}