public static (GarlicAESBlock, I2PSessionKey) EGDecryptGarlic(
GarlicMessage garlic,
I2PPrivateKey privkey)
{
var cipher = new CbcBlockCipher(new AesEngine());
var egdata = garlic.EGData;
var egbuf = new BufLen(egdata, 0, 514);
var egheader = ElGamalCrypto.Decrypt(egbuf, privkey, true);
var sessionkey = new I2PSessionKey(new BufLen(egheader, 0, 32));
var preiv = new BufLen(egheader, 32, 32);
var egpadding = new BufLen(egheader, 64, 158);
var aesbuf = new BufLen(egdata, 514);
var pivh = I2PHashSHA256.GetHash(preiv);
cipher.Init(false, sessionkey.Key.ToParametersWithIV(new BufLen(pivh, 0, 16)));
cipher.ProcessBytes(aesbuf);
GarlicAESBlock aesblock =
new GarlicAESBlock(new BufRefLen(aesbuf));
if (!aesblock.VerifyPayloadHash())
{
throw new ChecksumFailureException("AES block hash check failed!");
}
return(aesblock, sessionkey);
}
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 void TestEGCompatibilityDecode()
{
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 decr = ElGamalCrypto.Decrypt(
new BufLen(FreenetBase64.Decode(ENCRYPTED[i])),
priv,
true);
var clear = new BufLen(Encoding.UTF8.GetBytes(UNENCRYPTED[i]));
Assert.IsTrue(decr == clear);
}
}
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 BuildRequestRecord Decrypt(I2PPrivateKey pkey)
{
return(new BuildRequestRecord(new BufRef(ElGamalCrypto.Decrypt(EncryptedData, pkey, false))));
}
public void TestEGDecrypt()
{
var mi =
"niPls-Doz1DJ3ua4pQDwstMeqnmznBCU~qaxIidv" +
"jTW~ohDDpq3BatYwTSM-fIr-eEy4Amdl-tWJTXRO" +
"2UzftkuD1-t-Ix9EfED26KrUxnwx2fC74Haykj9L" +
"oytqFTFbYj34kMCUDDbhAqv6Ep3EDY8Am7WYqSJL" +
"stXXV4tUFZ~mteCm1qfNUbbl6itCUId7zcgkW6SX" +
"rwdkno3Ul4H~WVDtmewlxdDbT-rYyOJTnp4Y39Mo" +
"8B1ojtMuGCgtbk-LS4gJmlXeCJh~1kHiM-nLIB9W" +
"rtq8O4weJ~-R36obERZofGOV3D3kSKSoawXVcq4V" +
"BlQOHTn24LkTHYLh3O~0SZlT0KfU5WrqTZtu8jZ~" +
"B0q-cvrfqqWcmCFCoKW3WSJ5D0qZi1e9sLMebM96" +
"asSRFZvlOUp8xZm84Z-au~m3EmkAaF4QlAzufA~L" +
"~1RFaepKpfng0eWfWG73H1daoL3c2e3Pt~5m07FR" +
"ZMr6TZoj1IsuI7J-QXRGfvbuMjJqB-tMBQAEAAcA" +
"ADJtDgiK2OMz6qSmopA~cLUMW~zQesBqsoYx9AEc" +
"sOIkp4g8YgRK2jJhfY46h7aj76ftkV-5uF6xoDUG" +
"kbIQGH3rjneTQ2wspOz2WRpQk0MW6Ugd0H~5vYK2" +
"ekploxq2gOil0Ad1rz~uobpE2bBKYK9B-EEkRKEP" +
"-GTX6DSyosFXxMC1I5cwLDWmXktdNVuzt56AxfcL" +
"Nzh9gd1R4l903-aFRiY~VXFHg1NjWBPcjCCz6fpL" +
"U0XIdg6hf~DNMnd5D4C27HYujxUi6tj42sikDCPu" +
"P6CBGAH~j7vzqkDxW2wker91lwwp~6N8jN4xcvme" +
"-EI27LPGnOICvpzxdVrKtpc0Ib4dOe8SFkvxSR4x" +
"PDSGWFF-~vAELzyHTYiE07ahNw==";
var myinfo = FreenetBase64.Decode(mi);
var ed =
"AAAOggAE3uf0930YRPZqauUGNYgj5Ix7aoMz0ZO8" +
"OIYpRS9zFi6CHe-SXOCeZMgOSxdkp320s70lnAJ9" +
"2Z0fjP9WbBeKuCPjZSyMa-MQ4Bq5Sv~iXK-5T~ui" +
"m9WTMnwzWIltbt2Toncx-9aAGsIgoABUpzQ1yjsG" +
"-DwSEazn1ZsGAxGXI74SqokXGBggerXCtAhpTOTJ" +
"MsFteib29WhURmPxLXPxtoCqav8hEUjEyBy2pnPE" +
"h-3fcZPhxfK5FI0h0vZO0ZATZx~0RDV9NyxwaAMy" +
"llav8iG2nFmVd7hkvWSVdcaRp2gpZuDcM9aXb2yo" +
"xIagerhVF8Dyfbib3YX8GP9tvOhBAGWSRlvNIW6i" +
"ImwOHJPuCbD4f2Ombp2VENYfKH~Tc4JP53DOnLs0" +
"1pMze3xLaK0LsoPwR2LgYfamxbGDINa8KNB0PXC7" +
"l7zcO6vDuC~mlVgs6VkkC-kirW8QMpO9t7v49l3y" +
"tqlHBLU~khJwBFYuQEoB78bt~RQANw6R6V12yRIE" +
"oW8dGJh5P1eGAFgO24oHyfLdKB-vfm1SZQB5MVyU" +
"Ec6Hv4AKDBsxFqzFbThSgURqWk~AL9v-LuMhz034" +
"jq-fGZtUY3l~ogz12IxdJIJVsjvJ2jWE-8NyFzC5" +
"NhCSYV8jgdbL56ISMNPT9PRuiIyMHJ1w1NfypZ3c" +
"aHKEnIjBzpj6R-9~~8PjLvdNO9cVaur5OLOGf4Q3" +
"ABbqj9rg5uMJYIrFgddB4uETzb97Iue8BJr8XTRh" +
"mwihpOLabG9r1b4-X1Z1HpBZxp8ml3xlZ-Lw6zp3" +
"rQj2O84fSr0pxQh04Q-gIPBq7d4fS74uHMhN6rMx" +
"bydEq0QQe4cqHDlGO-WZuTmK0tN-vMkwgHRXlz18" +
"AdFFTf4caSoYerKPCk07neOWn0Vop1ni3DTRL~Tv" +
"k04ZxNLnuuuor8gBh~jVFS-S9EnKkLcWJtJFcVbY" +
"y9ZK-4caSvFGz1-Qf0elJKA-cpx7-ivKIQLQEuhx" +
"5U6FrnJvchbY4JaZq2QzXVRF8s7X04kYOWWmAPXt" +
"C3xE58e9s4-5MJhLNjdsjXoJ0R9jBleMWF-RsVwy" +
"QNlTtabQDtDUzVeEQNRAHu9nVc0mJ18NH04KFMbH" +
"jTWpgY1wDFB9566C9OOKzK-gkTjzO5RlSwDn5sgN" +
"iejCOqM0-4JzMlFQNCuhMvmYAglRG8dLDZ3WjYck" +
"NiRqHP2iKMyGQThwIS~TCzc-i5WgNzjLKPnWhhKm" +
"1uvsZiWdnVAn9IOsFuOYvuR5NBnRJb~lYWI~zlvT" +
"8riNkMIrnCE4CF380NEPfulMM6~98XVtmuMTY-Im" +
"Zut2O1kz0OCBvCiYClrFlSlVDVoYEbVmkyoBKjiq" +
"dGdPtLC5FnX6eC2bcUNGFOOY32ozF3UUsaRWVMrC" +
"Y824xhPxcCt2yiJ~rSXAEBN2qtVW90wYzamz9pw6" +
"XiNUdhshjLrOb-qVAnC33Kak89wbPtMGh6uXljR4" +
"YxZ3gW2Tl9LIu4~5QP~sS7plo19-bdRfL8uAZ63j" +
"gy-fY71std81WBfthqlOTFJMf~c-EU8xj90O408z" +
"qYfFty-wgBBfYeeHdyWAWrqbfwLCMlHGGN0M-dbV" +
"SjzwgSeLTYbdPrX1Dr6NHxSnJ9br0sXfoFUao1xa" +
"4FN556lbolHjV0ns~6IbOVWElDNNecsLxjTWKgdA" +
"CrLdh2ZMFL9M56H2Xdz4Adsm5vY1K6kCcLPgbpgb" +
"~~gl-Qq4AEc~-nV6fxpu7pmH3HfTXIm0aDtR1KG7" +
"kEHv-MreoFvmWvnVCj6tqJr5LAOKCDTvm7cw5fYc" +
"27gsskqG~SM~1TyPkF5sb5~xX1EkAYm9PC0pA9WG" +
"1~M4640pRCzbVl7jWqf1B~RPc7FRs3wMZqHu6SJW" +
"kDRfvupQeNU6TXTkVPwJZcfTElH9ajcu23ucNXP-" +
"Glp-00AZZA2fwOzdJe8AlzBIReLRyWKza5hLqmAy" +
"paI1e5wSFDgXH027-tXLCYw-l2rsHl2aDO-M0Psj" +
"OOA4GhdBUlLZWdy6OAI1~vpssgFY9CUErqR6m7LA" +
"mLa9NaBFtTt~ZUYgc0TyrYfXjecl-jxUcPnYEo3u" +
"YiBx3kk73LQWI-jj4IqKxUf1Rjp6b~Vhw77NFQPr" +
"vqe91ICRuo9XTMavCQP8R1Lg2R7CwljE2qLJ0qxM" +
"UN34gUfOIdQzBi~ApnG~aLoRwwro2U2MA63RMKkZ" +
"OoXpjAmPj1xGqsQ73bI3lpfpHFLbWm3Ax37t2aud" +
"c7-nPoaKoNvNIC0~28jROr35UGCKNMSNmqrifhHB" +
"wsIqqMrubLjjmts-ELHWZF~1AZEDKMGrF3j-zGVg" +
"LAhaSCvG3CNjaHTiAkPXc5zRwFLi5XTof1QipptG" +
"u~j6-0Kpcwb5aWUD4q0JFxJPd0pt5p8N8r8Y04RR" +
"TSzzyQsC8iGUDsmQyAnsquvMBpMBoCd3pOsSwYu3" +
"d0A7UAoEI0S3Cp4JPndz2waXB4RhJzmHQu3JYv3A" +
"IzYNfKvLwkZVdky-e7MqHtrSJU6HErb7JE7CgtW1" +
"Gv-WYaCGZZR5qt3x-43CCYN9qnLpSIOXL17yK6P1" +
"wsc2lXnAj6IYzppaH6~CtP3WnrsiEzh6lznkQbDx" +
"pFygHfhvQQBJbhfjLL6-0RWG52oVsurXnT4og0oW" +
"0itSdrP2tFjKc3aFkG4toWyDpfEOS427cPxRRNv6" +
"6uEq-giDYHxVuk5k4TQ9bBp4HaWSKS55vr-oz5FF" +
"SjT~p3-7WViVeoSO4wbcO7x2djkaQ7rWm6eiggut" +
"NKw3WVNTG-oEQWuauwWp7mHwbDmTC7i-j4dvxMfz" +
"k4gRWFOZpOEXIuiVBp20Ljy53fqZaSmijYqJwpRi" +
"l~g6h-gvc43GMdoC48ryj0ClTN209Ua20YN54lg~" +
"izHnl6X-VnmgPr298LKe0COK0xlDLKj~tu2CIzi3" +
"mNwe4eLWfsmKRGrcXMwfz7F2SfOfNpqXbpgAV9AZ" +
"Qy-SPuqFxNTcmclIzWKudDECoUqADHu3-tLijV0m" +
"uer990OtbKeSrW9ICCVpjrbh5aPezOLNXcDkfxGB" +
"S~yLpUgLn1aCFQv6Bz1htwfEpeKfqQvwVfD17SoW" +
"-8XBA2ORSqXGOL9x93tzmt1pspsfgehXTqEVerH9" +
"H9qCAECvRtyHu7jh-DNxFtnA-w5PTg7sf0uKKMOf" +
"qtvIrpJulVuPl~JX89aigeihJXAQoc-QD5aMBVYC" +
"n55mgrYUEKfe4~yYYYdkJCG0zwD5mADMA-elcNUI" +
"ojXYff~X4eJwm1upbS5LpVyH4D-F57JMJKBFOUA4" +
"Z6i1qTjQInIDYeinHKRThB9hz3EIB18TvroAz5Yl" +
"UdE-BmdrXsXHztucbfw4GQ5LamIGHeYrapJ4QkRm" +
"s~a5kdy78FrTV4drRuqoGWlpB9MORKyUVKZbQJND" +
"6ncPyrRLaVTXy4m~L2MZoi4mPifkH6JdCUtyHK4f" +
"Z0Ch1CSjHBr~kN3FoQRW4fJ9SazZ7sreYJLHOBhf" +
"IdJTlu6ZX~nVwDzBZSg-kDj0phD7iWSAy9tI-qjq" +
"nLkoZZj7oDt~L1Z-M~pXgsZkfIYN2nfoC3JV~HFl" +
"W7DB3HEphkpU2cCzr2-BBFGGftNup6O1rohh1OSD" +
"1T9OOACf-VvRk~z1motf5Y9oboEljWgrsqXSgDWM" +
"Nsmk7WBv0e8H8SaNiKwoRiT4Y6EVjIe5Ft5pw7r7" +
"7s3RhsGA6EcmRT8POELuJz5Q7qK7rYbDw1Ooil9v" +
"ebQ7Zo9m~FpTAGAnuIgcPvmFfcgdI9Y46SV1JK4f" +
"N91F5dm~7BXZcstbE3cinOV7VEiUEUUPiZaW6dXv" +
"7dEwrELbD0gFStVy5IGuy1gqsygVxCvQwXFZ2j0N" +
"EpYr0NTIwEOWKol17u3UTBSY6zhhajSPxl1f0QeF" +
"yybEcw41IHy1fDZ3RfihzHIislrcDYHQ3mr~kdYC" +
"oUlK83CKpQL2NJPKtLXsx0ATPjSYOg9Q25rf9v8c" +
"joNrHERzhbDgqeCIXmSF5nLEpys~yRKLYpl7RLPS" +
"fptt5gLOVNLmp~Z4CAKjLN-aqMYNopmy92-u74fb" +
"u-d7UftyaZHNgT2QNP7TDrwYfivNKRS6detKwTYH" +
"fxVpGRDT2HIHXZE3xCfZa6YmfPCrl0kAKAt1NB4i" +
"VBb~TJ0p43CuaMnT~Mu7vXkwGVKJtZ3bGQfUtEhJ" +
"xh61nVfh3k1F3EuczB~f1ekAZDMa9qhkp-Rv67~S" +
"97ASXgyz673QLIoksK2udHB0iHPL6H2pJlBpv4oH" +
"4YnA0o4ejTUy5vLgret0ItpMao4waezWK8TMHAzD" +
"STd76eOIacKbIYkuorpx2atQrHizDQ9vPSIvurH7" +
"8gMHJ03JnYoh60zIvZIqDajTS9vrqIvvu5HaB2re" +
"bqmfMx2XKEvjqEBA7hPdqXR6n9typIcj1tqdHK-h" +
"9iOYkQ81u64y6SgYMxuXNd38AFTUUouh1OQp2jVv" +
"pnLLR-vUT1-G-lO8Xw5wrlwx6G4BA3peKmaMIxBu" +
"iJA0qLUc336-oFXvThUh2JwT9RshrKclS7vp-zc9" +
"8dzAXxATuxKakXZaJGQ91xWyTkz8lFzuGnfWK5HF" +
"CgNiOa2F8nbR5kzofCXyYHyRbp9pT8Ek1xAK0Ayp" +
"FYwqfcVFZnhe0TXcup5UDgdFlroirzfJaDIbQKBz" +
"O4cS68Kd4YV9HPgu2de84dz~PfIgredg-A-rKon8" +
"1ZhGylOgaXCDNNag9mjdF7B5nFjddYytaOgFCTDR" +
"G0ntFV8mMDIwxW9GZtt6MSJQSJqjdOM1ywFdPrdX" +
"GDKnib~NO247LxGLa05wUZPMvg92~mPgg9SkD9v4" +
"-g008LITmMajbpE8~0t-jijMKJkPCQxOaBsH5-fn" +
"uToqxg-xm0d9wg48Xr5BmirS5UbC7pS-U9pKI1E8" +
"vp~DWbxxRpulZYhgNq2-cR2w7ie01mDleoUv-tdk" +
"T9L1erdyTAhHrw2YNe0SD8OmyvW4aPPsjAGMeg==";
var egdata = FreenetBase64.Decode(ed);
var di = new I2PDestinationInfo(new BufRefLen(myinfo));
var decr = ElGamalCrypto.Decrypt(new BufLen(egdata, 4, 514), di.PrivateKey, true);
}
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));
}
public Garlic DecryptMessage(EGGarlic message)
{
lock ( SessionTags )
{
var old = SessionTags.Where(p => p.Key.Created.DeltaToNow.ToMinutes > (I2PSessionTag.TagLifetimeMinutes + 2)).ToArray();
foreach (var one in old)
{
SessionTags.Remove(one.Key);
}
}
var egdata = message.EGData;
var tag = new I2PSessionTag(new BufRefLen(egdata, 0, 32));
I2PSessionKey sessionkey;
bool found;
lock ( SessionTags )
{
found = SessionTags.TryGetValue(tag, out sessionkey);
}
BufLen aesbuf;
if (found)
{
aesbuf = new BufLen(egdata, 32);
lock ( SessionTags )
{
SessionTags.Remove(tag);
}
#if LOG_ALL_TUNNEL_TRANSFER
DebugUtils.LogDebug("ReceivedSessions: Working tag found for EGarlic.");
#endif
var pivh = I2PHashSHA256.GetHash(tag.Value);
Cipher.Init(false, sessionkey.Key.ToParametersWithIV(new BufLen(pivh, 0, 16)));
Cipher.ProcessBytes(aesbuf);
}
else
{
BufLen egheader;
try
{
var egbuf = new BufLen(egdata, 0, 514);
egheader = ElGamalCrypto.Decrypt(egbuf, Key, true);
}
catch (Exception ex)
{
DebugUtils.Log("ReceivedSessions", ex);
return(null);
}
#if LOG_ALL_TUNNEL_TRANSFER
DebugUtils.LogDebug("ReceivedSessions: Using ElGamal to decrypt.");
#endif
sessionkey = new I2PSessionKey(new BufLen(egheader, 0, 32));
var preiv = new BufLen(egheader, 32, 32);
var egpadding = new BufLen(egheader, 64);
aesbuf = new BufLen(egdata, 514);
var pivh = I2PHashSHA256.GetHash(preiv);
Cipher.Init(false, sessionkey.Key.ToParametersWithIV(new BufLen(pivh, 0, 16)));
Cipher.ProcessBytes(aesbuf);
}
GarlicAESBlock aesblock;
try
{
aesblock = new GarlicAESBlock(new BufRefLen(aesbuf));
}
catch (Exception ex)
{
DebugUtils.Log("ReceivedSessions", ex);
return(null);
}
if (!aesblock.VerifyPayloadHash())
{
DebugUtils.LogDebug("ReceivedSessions: DecryptMessage: AES block SHA256 check failed.");
return(null);
}
#if LOG_ALL_TUNNEL_TRANSFER
DebugUtils.LogDebug("ReceivedSessions: Working Aes block received. " + SessionTags.Count.ToString() + " tags available.");
#endif
if (aesblock.Tags.Count > 0)
{
#if LOG_ALL_TUNNEL_TRANSFER
DebugUtils.LogDebug("ReceivedSessions: " + aesblock.Tags.Count.ToString() + " new tags received.");
#endif
lock ( SessionTags )
{
foreach (var onetag in aesblock.Tags.ToArray())
{
SessionTags[new I2PSessionTag(new BufRef(onetag))] = sessionkey;
}
}
}
return(new Garlic((BufRefLen)aesblock.Payload));
}