What type of checksum is this?

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What type of checksum is this?

Postby PrinceOfFunky » Tue May 07, 2019 3:15 am

UnrealScript gives me this checksum:
Code: Select all
b73132acdd7c95469ac52f4e2264cb3d

for the file "UWeb.dll" that is found inside the "System" folder, can you tell what type of checksum it is?
It has 32 characters so I thought it was an MD5, but the MD5 for that file is:
Code: Select all
59CE64CC09E8F412635B3CF2CD5C61DC

UnrealScript creates a temp file of the original file, in this case the MD5 was:
Code: Select all
D41D8CD98F00B204E9800998ECF8427E

So I'm not sure if the first checksum I posted is not an MD5 or it is the MD5 performed when the file was on a different state.
Pheraps I did this procedure twice and the checksum was the same.

EDIT: Looks like that checksum is the only one that I get for every file, so now i wonder if that is the checksum of the file I specify or of another file.
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Re: What type of checksum is this?

Postby sektor2111 » Wed Jul 17, 2019 5:47 pm

Bump, later indeed because I didn't see any reply
Perhaps is MD5 but... it's pretty useless for me, I'm not interested about stat-logs any and their checksums, and because source-code was pointed already in forum let me list what I could see:
Code: Select all
void AStatLogFile::execGetChecksum( FFrame& Stack, RESULT_DECL )
{
   guard(AStatLogFile::execGetChecksum);
   P_GET_STR_REF(Checksum);
   P_FINISH;

   BYTE Secret[16];   // Must be bytes.  Used by MD5.
   Secret[0] = 'M';
   Secret[5] = 'p';
   Secret[2] = 'y';
   Secret[3] = 'f';
   Secret[1] = '4';
   Secret[11] = 'd';
   Secret[7] = '9';
   Secret[4] = 'G';
   Secret[12] = 'D';
   Secret[6] = '6';
   Secret[9] = 'e';
   Secret[10] = 'J';
   Secret[14] = '1';
   Secret[15] = 'q';
   Secret[8] = 'k';
   Secret[13] = 'V';

   BYTE Digest[16];

   appMD5Update( (FMD5Context*) Context, Secret, 16 );
   appMD5Final( Digest, (FMD5Context*) Context ); // Outputs a 16 byte digest.

   // Copy each byte into a string of arbitrary character size. (UNICODE safe.)
   INT i;
   for (i=0; i<16; i++) {
      *Checksum += FString::Printf(TEXT("%02x"), Digest[i]);
   }

   unguardexec;
}
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