CornedBeef Hash (UDF)

[willichan]

A reasonably speedy and overly simplistic hash generator (definately not a cryptographic hash)
 I had a minor project that I didn't feel like putting in the effort to use any recognized hashing algorithm, so I made this one as a quick and dirty, just "for sh*ts and giggles" algorithm.  Useable, but don't take it seriously.  Maybe just an example of how you can compartmentalize your UDF and avoid using global variables.

CornedBeefHash.au3

Edited October 9, 2023 by willichan
Fixed typo

[TheDcoder]

Have you tested this algorithm for collisions?

[willichan]

It is a quick and dirty hash, but I have not had any issues with it.  I ran a bunch of random Lorem Ipsum paragraphs through it.  Feel free to bash at it with any testing you would like to throw at it.  I would be curious to see what you find.

It boils down to a 4-way 8-bit XOR calculation, so . . .  don't try using it for security hashing purposes.

Edited October 6, 2023 by willichan

[taurus905]

This is a nice example of how to compartmentalize your UDF and avoid using global variables.

I would suggest a simple example script on how to use the six functions.

I'm sure others would like to see it in action.

_CornedBeef_Add
_CornedBeef_Destroy
_CornedBeef_Hash
_CornedBeef_Initialize
_CornedBeef_Read
_CornedBeef_Reset

taurus905

[TheSaint]

Thanks for sharing. Will check it out.  

[willichan]

On 10/6/2023 at 10:18 PM, taurus905 said:

I would suggest a simple example script on how to use the six functions.

I will try to bang out an example script soon.

[spudw2k]

Just a couple of observations to share after playing around:

• Consecutive chars or a repeated strings seem to undo the hash and possibly reveal the seed (unless a different seed is used each time). e.g. "AA" "ABAB" "DEADBEEFDEADBEEF"
• 9223372036854775807 and -9223372036854775807 seem to be the largest positive and lowest negative seed values.  Anything above or below that range generates the same hash max/min seed values.

Edited October 12, 2023 by spudw2k

[willichan]

On 10/11/2023 at 8:55 PM, spudw2k said:

Just a couple of observations to share after playing around:

• Consecutive chars or a repeated strings seem to undo the hash and possibly reveal the seed (unless a different seed is used each time). e.g. "AA" "ABAB" "DEADBEEFDEADBEEF"
• 9223372036854775807 and -9223372036854775807 seem to be the largest positive and lowest negative seed values.  Anything above or below that range generates the same hash max/min seed values.

Thank you.  I appreciate the efforts you put in to testing it out.

This just illustrates why I said that it is not for cryptographic use, is just "for sh*ts and giggles", and that it is "Useable, but don't take it seriously."  🙃

I used this more for making quick file or data comparisons.  It does that in its lazy-man's quick and dirty fashion.