I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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#include <time.h>
#include <stdio.h>
#include <cryptopp/sha.h>
#include <cryptopp/osrng.h>
#include <cryptopp/dh.h>
#include <cryptopp/dsa.h>
#include "CryptoConst.h"
#include "Identity.h"
namespace i2p
{
namespace data
{
Identity& Identity::operator=(const Keys& keys)
{
// copy public and signing keys together
memcpy (publicKey, keys.publicKey, sizeof (publicKey) + sizeof (signingKey));
memset (certificate, 0, sizeof (certificate));
return *this;
}
IdentHash CalculateIdentHash (const Identity& identity)
{
IdentHash hash;
CryptoPP::SHA256().CalculateDigest((uint8_t *)hash, (uint8_t *)&identity, sizeof (Identity));
return hash;
}
Keys CreateRandomKeys ()
{
Keys keys;
CryptoPP::AutoSeededRandomPool rnd;
// encryption
CryptoPP::DH dh (i2p::crypto::elgp, i2p::crypto::elgg);
dh.GenerateKeyPair(rnd, keys.privateKey, keys.publicKey);
// signing
CryptoPP::DSA::PrivateKey privateKey;
CryptoPP::DSA::PublicKey publicKey;
privateKey.Initialize (rnd, i2p::crypto::dsap, i2p::crypto::dsaq, i2p::crypto::dsag);
privateKey.MakePublicKey (publicKey);
privateKey.GetPrivateExponent ().Encode (keys.signingPrivateKey, 20);
publicKey.GetPublicElement ().Encode (keys.signingKey, 128);
return keys;
}
RoutingKey CreateRoutingKey (const IdentHash& ident)
{
uint8_t buf[41]; // ident + yyyymmdd
memcpy (buf, (const uint8_t *)ident, 32);
time_t t = time (nullptr);
struct tm tm;
gmtime_r (&t, &tm);
sprintf ((char *)(buf + 32),"%4i%2i%2i", tm.tm_year, tm.tm_mon, tm.tm_mday);
RoutingKey key;
CryptoPP::SHA256().CalculateDigest(key.hash, buf, 40);
return key;
}
XORMetric operator^(const RoutingKey& key1, const RoutingKey& key2)
{
// TODO: implementation depends on CPU
XORMetric m;
((uint64_t *)m.metric)[0] = ((uint64_t *)key1.hash)[0] ^ ((uint64_t *)key2.hash)[0];
((uint64_t *)m.metric)[1] = ((uint64_t *)key1.hash)[1] ^ ((uint64_t *)key2.hash)[1];
((uint64_t *)m.metric)[2] = ((uint64_t *)key1.hash)[2] ^ ((uint64_t *)key2.hash)[2];
((uint64_t *)m.metric)[3] = ((uint64_t *)key1.hash)[3] ^ ((uint64_t *)key2.hash)[3];
return m;
}
}
}