diff --git a/src/d_main.cpp b/src/d_main.cpp
index 5e21867bbf..6491dc3e35 100644
--- a/src/d_main.cpp
+++ b/src/d_main.cpp
@@ -214,6 +214,7 @@ bool autostart;
 FString StoredWarp;
 bool advancedemo;
 FILE *debugfile;
+FILE *hashfile;
 event_t events[MAXEVENTS];
 int eventhead;
 int eventtail;
@@ -2220,6 +2221,26 @@ void D_DoomMain (void)
 		execLogfile(logfile);
 	}
 
+	if (Args->CheckParm("-hashfiles"))
+	{
+		FString filename = "fileinfo.txt";
+		Printf("Hashing loaded content to: %s\n", filename);
+		hashfile = fopen(filename, "w");
+		if (hashfile)
+		{
+			fprintf(hashfile, "%s version %s (%s)\n", GAMENAME, GetVersionString(), GetGitHash());
+#ifdef __VERSION__
+			fprintf(hashfile, "Compiler version: %s\n", __VERSION__);
+#endif
+			fprintf(hashfile, "Command line:");
+			for (int i = 0; i < Args->NumArgs(); ++i)
+			{
+				fprintf(hashfile, " %s", Args->GetArg(i));
+			}
+			fprintf(hashfile, "\n");
+		}
+	}
+
 	D_DoomInit();
 	PClass::StaticInit ();
 	atterm(FinalGC);
@@ -2289,6 +2310,11 @@ void D_DoomMain (void)
 		pwads.Clear();
 		pwads.ShrinkToFit();
 
+		if (hashfile)
+		{
+			Printf("Notice: File hashing is incredibly verbose. Expect loading files to take much longer then usual.\n");
+		}
+
 		Printf ("W_Init: Init WADfiles.\n");
 		Wads.InitMultipleFiles (allwads);
 		allwads.Clear();
diff --git a/src/doomstat.h b/src/doomstat.h
index 565d15bd61..b1784530fc 100644
--- a/src/doomstat.h
+++ b/src/doomstat.h
@@ -172,6 +172,7 @@ extern	bool	 		playeringame[/*MAXPLAYERS*/];
 
 // File handling stuff.
 extern	FILE*			debugfile;
+extern	FILE*			hashfile;
 
 // if true, load all graphics at level load
 extern	bool	 		precache;
diff --git a/src/w_wad.cpp b/src/w_wad.cpp
index 9455817db4..abbac57636 100644
--- a/src/w_wad.cpp
+++ b/src/w_wad.cpp
@@ -56,6 +56,7 @@
 #include "doomerrors.h"
 #include "resourcefiles/resourcefile.h"
 #include "md5.h"
+#include "doomstat.h"
 
 // MACROS ------------------------------------------------------------------
 
@@ -300,6 +301,56 @@ void FWadCollection::AddFile (const char *filename, FileReader *wadinfo)
 				AddFile(path, embedded);
 			}
 		}
+
+		if (hashfile)
+		{
+			BYTE cksum[16];
+			char cksumout[33];
+			memset(cksumout, 0, sizeof(cksumout));
+
+			FileReader *reader = wadinfo;
+
+			if (reader != NULL)
+			{
+				MD5Context md5;
+				reader->Seek(0, SEEK_SET);
+				md5.Update(reader, reader->GetLength());
+				md5.Final(cksum);
+
+				for (size_t j = 0; j < sizeof(cksum); ++j)
+				{
+					sprintf(cksumout + (j * 2), "%02X", cksum[j]);
+				}
+
+				fprintf(hashfile, "file: %s, hash: %s, size: %d\n", filename, cksumout, reader->GetLength());
+			}
+
+			else
+				fprintf(hashfile, "file: %s, Directory structure\n", filename);
+
+			for (DWORD i = 0; i < resfile->LumpCount(); i++)
+			{
+				FResourceLump *lump = resfile->GetLump(i);
+
+				if (!(lump->Flags & LUMPF_EMBEDDED))
+				{
+					reader = lump->NewReader();
+
+					MD5Context md5;
+					md5.Update(reader, lump->LumpSize);
+					md5.Final(cksum);
+
+					for (size_t j = 0; j < sizeof(cksum); ++j)
+					{
+						sprintf(cksumout + (j * 2), "%02X", cksum[j]);
+					}
+
+					fprintf(hashfile, "file: %s, lump: %s, hash: %s, size: %d\n", filename, lump->FullName ? lump->FullName : lump->Name, cksumout, lump->LumpSize);
+
+					delete reader;
+				}
+			}
+		}
 		return;
 	}
 }