void ZIDCacheFile::createZIDFile(char* name) {
zidFile = fopen(name, "wb+");
// New file, generate an associated random ZID and save
// it as first record
if (zidFile != NULL) {
randomZRTP(associatedZid, IDENTIFIER_LEN);
ZIDRecordFile rec;
rec.setZid(associatedZid);
rec.setOwnZIDRecord();
fseek(zidFile, 0L, SEEK_SET);
if (fwrite(rec.getRecordData(), rec.getRecordLength(), 1, zidFile) < 1)
++errors;
fflush(zidFile);
}
}
ZrtpDH::ZrtpDH(const char* type) {
uint8_t random[64];
dhCtx* tmpCtx = new dhCtx;
ctx = static_cast<void*>(tmpCtx);
// Well - the algo type is only 4 char thus cast to int32 and compare
if (*(int32_t*)type == *(int32_t*)dh2k) {
pkType = DH2K;
}
else if (*(int32_t*)type == *(int32_t*)dh3k) {
pkType = DH3K;
}
else if (*(int32_t*)type == *(int32_t*)ec25) {
pkType = EC25;
}
else if (*(int32_t*)type == *(int32_t*)ec38) {
pkType = EC38;
}
else if (*(int32_t*)type == *(int32_t*)e255) {
pkType = E255;
}
else if (*(int32_t*)type == *(int32_t*)e414) {
pkType = E414;
}
else {
return;
}
randomZRTP(random, sizeof(random));
if (!dhinit) {
bnBegin(&two);
bnSetQ(&two, 2);
bnBegin(&bnP2048);
bnInsertBigBytes(&bnP2048, P2048, 0, sizeof(P2048));
bnBegin(&bnP3072);
bnInsertBigBytes(&bnP3072, P3072, 0, sizeof(P3072));
bnBegin(&bnP2048MinusOne);
bnCopy(&bnP2048MinusOne, &bnP2048);
bnSubQ(&bnP2048MinusOne, 1);
bnBegin(&bnP3072MinusOne);
bnCopy(&bnP3072MinusOne, &bnP3072);
bnSubQ(&bnP3072MinusOne, 1);
dhinit = 1;
}
bnBegin(&tmpCtx->privKey);
INIT_EC_POINT(&tmpCtx->pubPoint);
switch (pkType) {
case DH2K:
case DH3K:
bnInsertBigBytes(&tmpCtx->privKey, random, 0, 256/8);
break;
case EC25:
ecGetCurveNistECp(NIST256P, &tmpCtx->curve);
ecGenerateRandomNumber(&tmpCtx->curve, &tmpCtx->privKey);
break;
case EC38:
ecGetCurveNistECp(NIST384P, &tmpCtx->curve);
ecGenerateRandomNumber(&tmpCtx->curve, &tmpCtx->privKey);
break;
case E255:
ecGetCurvesCurve(Curve25519, &tmpCtx->curve);
ecGenerateRandomNumber(&tmpCtx->curve, &tmpCtx->privKey);
break;
case E414:
ecGetCurvesCurve(Curve3617, &tmpCtx->curve);
ecGenerateRandomNumber(&tmpCtx->curve, &tmpCtx->privKey);
break;
}
}