crc32 of a binary file

[wiebe@CARYA]

---

@crossrulz wrote:

---

wiebe@CARYA wrote:

Why not use MD5? There's an OOTB VI for getting a file's MD5... Not technically a CRC, but probably works even better.

---

In my experience, they work the same as long as your file stays under 4GB (the limit of the CRC32 before getting a repeat answer).  It would be interesting to do a performance comparison...

---

I think MD5 will typically be slower, as the MD5 algorithm is a bit more complex as the typical CRC. The data reading is probably the bottleneck though.

The presence of an OOTB MD5 solution would make the choice easy for me.

If a 32 bit number is required, a CRC on the MD5 might do the trick. Or simply using a subset of the MD5 string...

[Mark_Yedinak]

Here is code that I use for calculating CRCs. Code for calculating both CRC-16 and CRC-32 is included. The CRC-32 is the same polynomial used for Ethernet traffic.

[arteitle]

Hopefully the original poster already found an answer to their question, considering their post was from 2009...

[Mark_Yedinak]

I realize that. But the recent discussion was discussing MD5 and CRCs and it was mentioned they would use MD5 because a solution existed. I simply provided one for CRCs too.

[billko]

Plus, there was someone who recently came to this thread on a Google search and complained about people suggesting searching Google as a solution.  Yet, this person hasn't come back to this thread for help, so apparently Googling WAS a solution.

[wiebe@CARYA]

---

@billko wrote:

Plus, there was someone who recently came to this thread on a Google search and complained about people suggesting searching Google as a solution.  Yet, this person hasn't come back to this thread for help, so apparently Googling WAS a solution.

---

Can't figure out who is supposed to "look especially dumb" exactly: the user asking or the one who posts to google? (I'm won't tell who I'd pick):

---

@Jandy wrote:

Telling a user to search is not useful. And looks especially dumb when it is on a google result. Just don’t post if yo don’t provide an answer.

[RavensFan]

You can always do the google search for someone else.

http://www.lmgtfy.com/?q=crc32+of+a+binary+file

[wiebe@CARYA]

---

@RavensFan wrote:

You can always do the google search for someone else.

http://www.lmgtfy.com/?q=crc32+of+a+binary+file

---

That usually doesn't land well either (I tried it).