Method ReEncryptAndWrite

ui/Services/Patching/Patcher.cs:830–848

(string cachePath, byte[] patchedPayload, byte[] iv)

        }

        void ReEncryptAndWrite(string cachePath, byte[] patchedPayload, byte[] iv)
        {
            // Reuse original IV: SteamTools does the same; new IV would break cache validation.
            Log("  Re-encrypting..");
            using var compMs = new MemoryStream();
            using (var zOut = new ZLibStream(compMs, CompressionLevel.Optimal, leaveOpen: true))
                zOut.Write(patchedPayload, 0, patchedPayload.Length);

            var blob = new byte[4 + compMs.Length];
            BitConverter.TryWriteBytes(blob.AsSpan(0, 4), patchedPayload.Length);
            compMs.GetBuffer().AsSpan(0, (int)compMs.Length).CopyTo(blob.AsSpan(4));

            var newCt = PayloadCrypto.AesCbcEncrypt(blob, AesKey, iv);
            var output = new byte[16 + newCt.Length];
            iv.CopyTo(output, 0);
            newCt.CopyTo(output, 16);
            FileUtils.AtomicWriteAllBytes(cachePath, output);
            _cachedPayload = null;
        }

        // Build the cave with caller-relative displacements.
        static byte[] BuildDynamicCloudRedirectCave(int caveRva, int sendPktRva,