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HASHBYTES


HASHBYTES

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Steve Jones
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Comments posted to this topic are about the item HASHBYTES

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Good one thanks.
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Add the sale string


The SALE string? This confused me! :-P

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Koen Verbeeck
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Good question, had to do a bit of research, but the MSDN link doesn't really back-up the explanation as it doesn't mention salt anywhere.

edit: in this thread, an MVP does the suggestion of adding a salt to the string itself.
http://social.msdn.microsoft.com/Forums/en-US/sqlsecurity/thread/6002f5a4-19a0-4a11-a569-e112375d3efa/


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Michael Riemer
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Have to agree that the SALE string confused me too. Otherwise it was a fairly simple question - Thanks
Stewart "Arturius" Campbell
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Thanks for the question, Steve.
took a fair bit of digging to find this.

One would expect MS to allow an optional parameter for salt to the HASHBYTES function...

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M&M
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No idea about this really. I guessed it and got it wrong :-)

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Raghavendra Mudugal
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For me this question did not made any sense.

the sample code is just concatenating another variable to it, you can name it @salt to @sugar... still the sample code will not make sense to me.

And in your question, you say as SALT parameter, HASHBYTES does not has any salt parameter, you are just concatenating a variable (declares as salt) - which does not makes as parameter to it.

if you just use this, it gives different results

select hashbytes ('SHA1', 'FIRST')
select hashbytes ('SHA1', 'FIRST' + ' SECOND')

in both cases INPUT value is different, so its obvious the HASH return string will be different. (its a known thing)

My only concern is - question and it's answer does not really suites. I dont think SALT is tech word here in SQL, so it does not paints proper picture.

ww; Raghu
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Tom Thomson
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Nice question.

Stewart "Arturius" Campbell (2/9/2012)
One would expect MS to allow an optional parameter for salt to the HASHBYTES function...

Or maybe not - unless perhaps they also provided a parameter to indicate whether the salt should be prepended or appended; Steve's code does the latter, but that's pretty unusual because people who deal with cryptographic matters (like hashing and encryption and key management and secure login and...) are used to prepending a salt (because in front is the only place it's useful in the applications of CBC mode encryption that need a salt).

Tom

michael.kaufmann
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Koen Verbeeck (2/9/2012)
but the MSDN link doesn't really back-up the explanation as it doesn't mention salt anywhere.


I'd second this; it's my understanding that concatenating a fixed string as salt (in Steve's example assigned to a variable) to another string can't be considered a salt parameter, which should be a random value (for increased security). The following query will return the exact same results as Steve's proposed solution in the 'Correct Answer' section of this QotD Cool:

declare @t nvarchar(200)

select @t = N'This is my string'

select
Hashbytes('SHA1', @t)
, Hashbytes('SHA1', @T + N'R@nd0mS!a6lTValue')



I'd say, no matter how many string parts are concatenated, the combined string qualifies as { @input | 'input' } following the HASHBYTES syntax.

Interesting question, though.
Thanks,
Michael
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