public static GarlicMessage AESEncryptGarlic( Garlic msg, I2PSessionKey sessionkey, I2PSessionTag tag, 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); // Tag as header writer.Write(tag.Value); // AES block var aesstart = new BufLen(writer); var aesblock = new GarlicAESBlock(writer, newtags, null, new BufRefLen(payload)); var pivh = I2PHashSHA256.GetHash(tag.Value); cipher.Init(true, sessionkey.Key.ToParametersWithIV(new BufLen(pivh, 0, 16))); cipher.ProcessBytes(aesblock.DataBuf); var length = writer - dest; dest.PokeFlip32((uint)(length - 4), I2NPMaxHeaderSize); return(new GarlicMessage(new BufRefLen(dest, I2NPMaxHeaderSize, length))); }
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))); }