public EGBuildRequestRecord(BufLen dest, BuildRequestRecord src, I2PIdentHash topeer, I2PPublicKey key)
{
Data = dest;
var writer = new BufRefLen(Data);
writer.Write(topeer.Hash16);
var datastart = new BufLen(writer);
ElGamalCrypto.Encrypt(writer, src.Data, key, false);
}
public void TestElGamal()
{
for (int i = 0; i < 20; ++i)
{
var data = new BufLen(BufUtils.RandomBytes(222));
var origdata = data.Clone();
var enc = new BufLen(ElGamalCrypto.Encrypt(data, Public, true));
var decryptdata = ElGamalCrypto.Decrypt(enc, Private, true);
Assert.IsTrue(decryptdata == origdata);
}
}
public void TestElGamalNoPad()
{
for (int i = 0; i < 20; ++i)
{
var egdata = new BufLen(new byte[512]);
var writer = new BufRefLen(egdata);
var data = new BufLen(egdata, 0, 222);
data.Randomize();
var origdata = data.Clone();
ElGamalCrypto.Encrypt(writer, data, Public, false);
var decryptdata = ElGamalCrypto.Decrypt(new BufLen(egdata, 0, 512), Private, false);
Assert.IsTrue(decryptdata == origdata);
}
}
public void TestElGamal2()
{
var buf = new byte[514];
for (int i = 0; i < 20; ++i)
{
var data = new BufLen(BufUtils.RandomBytes(222));
var origdata = data.Clone();
var start = new BufRefLen(buf);
var writer = new BufRefLen(buf);
ElGamalCrypto.Encrypt(writer, data, Public, true);
var enc = new BufLen(start, 0, writer - start);
var decryptdata = ElGamalCrypto.Decrypt(enc, Private, true);
Assert.IsTrue(decryptdata == origdata);
}
}
public void TestElGamal()
{
for (int i = 0; i < 20; ++i)
{
var egdata = new BufLen(new byte[514]);
var writer = new BufRefLen(egdata);
var data = new BufLen(egdata, 0, 222);
data.Randomize();
var origdata = data.Clone();
var eg = new ElGamalCrypto(Public);
eg.Encrypt(writer, data, true);
var decryptdata = ElGamalCrypto.Decrypt(egdata, Private, true);
Assert.IsTrue(decryptdata == origdata);
}
}
public static GarlicMessage EGEncryptGarlic(
Garlic msg,
I2PPublicKey pubkey,
I2PSessionKey sessionkey,
List <I2PSessionTag> newtags)
{
var cipher = new CbcBlockCipher(new AesEngine());
var payload = msg.ToByteArray();
var dest = new BufLen(new byte[65536]);
// Reserve header + 4 bytes for GarlicMessageLength
var writer = new BufRefLen(dest, I2NPMaxHeaderSize + 4);
// ElGamal block
var egbuf = new BufLen(new byte[222]);
var sessionkeybuf = new BufLen(egbuf, 0, 32);
var preivbuf = new BufLen(egbuf, 32, 32);
var egpadding = new BufLen(egbuf, 64, 158);
egpadding.Randomize();
preivbuf.Randomize();
sessionkeybuf.Poke(sessionkey.Key, 0);
var iv = new BufLen(I2PHashSHA256.GetHash(preivbuf), 0, 16);
ElGamalCrypto.Encrypt(writer, egbuf, pubkey, true);
// AES block
var aesstart = new BufLen(writer);
var aesblock = new GarlicAESBlock(writer, newtags, null, new BufRefLen(payload));
cipher.Init(true, sessionkey.Key.ToParametersWithIV(iv));
cipher.ProcessBytes(aesblock.DataBuf);
var length = writer - dest;
dest.PokeFlip32((uint)(length - 4), I2NPMaxHeaderSize);
return(new GarlicMessage(new BufRefLen(dest, I2NPMaxHeaderSize, length)));
}
public void TestEGCompatibilityEncode()
{
var priv = new I2PPrivateKey(
new BufRefLen(FreenetBase64.Decode(PRIVATE_KEY)),
new I2PCertificate());
var pub = new I2PPublicKey(
new BufRefLen(FreenetBase64.Decode(PUBLIC_KEY)),
new I2PCertificate());
for (int i = 0; i < ENCRYPTED.Length; ++i)
{
var clear = new BufLen(Encoding.UTF8.GetBytes(UNENCRYPTED[i]));
var encr = new BufLen(ElGamalCrypto.Encrypt(clear, pub, true));
Assert.IsTrue(encr.Length == 514);
var decr = ElGamalCrypto.Decrypt(encr, priv, true);
Assert.IsTrue(decr == clear);
}
}
GarlicCreationInfo GenerateNewSessionTags(uint trackingid, GarlicCloveDelivery[] cloves)
{
var newtags = new List <I2PSessionTag>();
for (int i = 0; i < 50; ++i)
{
newtags.Add(new I2PSessionTag());
}
lock ( SessionTags )
{
SessionTags.AddRange(newtags);
}
// Add a ACK message
DeliveryStatusMessage ackmsg;
var msg = AddExplAck(cloves, out ackmsg);
var payload = msg.ToByteArray();
var dest = new BufLen(new byte[61000]);
var writer = new BufRefLen(dest, 4); // Reserve 4 bytes for GarlicMessageLength
// ElGamal block
var egbuf = new BufLen(writer, 0, 222);
var sessionkeybuf = new BufLen(egbuf, 0, 32);
var preivbuf = new BufLen(egbuf, 32, 32);
var egpadding = new BufLen(egbuf, 64);
sessionkeybuf.Poke(SessionKey.Key, 0);
preivbuf.Randomize();
egpadding.Randomize();
var preiv = preivbuf.Clone();
var eg = new ElGamalCrypto(Destination.PublicKey);
eg.Encrypt(writer, egbuf, true);
// AES block
var aesstart = new BufLen(writer);
var aesblock = new GarlicAESBlock(writer, newtags, null, new BufRefLen(payload));
var pivh = I2PHashSHA256.GetHash(preiv);
Cipher.Init(true, SessionKey.Key.ToParametersWithIV(new BufLen(pivh, 0, 16)));
Cipher.ProcessBytes(aesblock.DataBuf);
var length = writer - dest;
dest.PokeFlip32((uint)(length - 4), 0);
LatestEGAckMessageId = ackmsg.MessageId;
#if LOG_ALL_TUNNEL_TRANSFER
Logging.LogDebug(() => string.Format(
"DestinationSession: Garlic generated with ElGamal encryption, {0} cloves. {1} tags available. Ack MessageId: {2}.",
msg.Cloves.Count, SessionTags.Count, LatestEGAckMessageId));
#endif
return(new GarlicCreationInfo(
Destination.IdentHash,
cloves,
new EGGarlic(new BufRefLen(dest, 0, length)),
GarlicCreationInfo.KeyUsed.ElGamal,
SessionTags.Count(),
trackingid,
ackmsg.MessageId,
LatestEGAckMessageId));
}
