Decrypt Encrypted Password

[Josef P.]

select HASHBYTES('SHA2_512', N'joseph')
     , convert(varchar(512), HASHBYTES('SHA2_512', N'joseph'), 2)

 

[theDBguy]

I just gave it a try, and this is the result I got.

0x24D6EDB8DBE2BCA27CFEFC1B0682BB7C34A0F5AA23EC6EA2724CC0DBFDBB9EB3D6BC90FEA92B84C0820DB784319ED53E6FB5DE74B19C36FEDE0C594D374792CD

I also experimented a little more, and I think you will be fine.

 

[Josef P.]

varchar:
HASHBYTES('SHA2_512', 'joseph') => 0x24D6EDB8DBE2BCA...

nvarchar:
HASHBYTES('SHA2_512', N'joseph') => 0x866D9B1682FB5DB56DDD86...

Different input generates different output.

 

[TheSearcher]

I see, so what do you get if you simply do something like?

 SELECT HASHBYTES('SHA2_512','joseph')

Just curious...

I get what I would expect:
0x24D6EDB8DBE2BCA27CFEFC1B0682BB7C34A0F5AA23EC6EA2724CC0DBFDBB9EB3D6BC90FEA92B84C0820DB784319ED53E6FB5DE74B19C36FEDE0C594D374792CD

 

[theDBguy]

I get what I would expect:
0x24D6EDB8DBE2BCA27CFEFC1B0682BB7C34A0F5AA23EC6EA2724CC0DBFDBB9EB3D6BC90FEA92B84C0820DB784319ED53E6FB5DE74B19C36FEDE0C594D374792CD

Yes, we all get the same thing, and I think @Josef P. already clarified why that is. Thanks.

 

[TheSearcher]

Yes. That's it. Thank you! One more question.
Why doesn't this work? This is how I would validate the user, correct?

select LoginName from [dbo].[user]
where PasswordHash = '0x866D9B1682FB5DB56DDD860C95D03447B7120B8E66481DA9FE65AC1FA85C0BEB36F0D1C653E3EE97E832C0D753263CBC8140CAD3F0881921A5E18DC8D93DE541'

 

[TheSearcher]

PassWordHash is binary(64) in the table. Just FYI.

 

[sonic8]

Why are they different?

The data types are different Varchar vs. NVarchar. That could cause the difference.

(just on the phone, cannot verify, just a guess.)

 

[TheSearcher]

select LoginName from [dbo].[user]
where PasswordHash = '0x866D9B1682FB5DB56DDD860C95D03447B7120B8E66481DA9FE65AC1FA85C0BEB36F0D1C653E3EE97E832C0D753263CBC8140CAD3F0881921A5E18DC8D93DE541'

This didn't work because I put tics at the beginning and end. I removed the single quotes and now everything is working as it should.
I can't thank you guys enough! I'm new to encryption and this was quite a challenge for me!