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How to produce a SHA-1 hash function in vb6 in order to save it to a table

Posted on 2016-11-09
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Last Modified: 2016-11-09
Please help us for a code in vb6 to hash SHA-1 a string before I saving to a table.

Thank you in advance
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Question by:rayluvs
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8 Comments
 
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Expert Comment

by:JesterToo
ID: 41881496
Perhaps you meant "encrypt" instead of "hash" since hashes are one-way and I'd assume you want to decrypt it sometime.  If so, then here is a link that describes hot to accomplish that.

https://support.microsoft.com/en-us/kb/821762
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Author Comment

by:rayluvs
ID: 41881514
Yes, that's what we need, one-way.  We hash sha1 the result save it to table.

Can this be done in vb6?
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LVL 22

Expert Comment

by:JesterToo
ID: 41881517
Ok, take a look at this link.  It has source code that purports to do what you want.

http://vb.wikia.com/wiki/SHA-1.bas
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Accepted Solution

by:
JesterToo earned 2000 total points
ID: 41881525
in the event that code proves to be faulty, search the internet for this phrase...

"vb6 sha1 source code philip ciebiera"
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Author Comment

by:rayluvs
ID: 41881571
Thanx!!! Found a code thet works excellent and we compared it to MS SQL HASHBYTE function is almost the exact!

We say exact because the SQL function always returns "0x" when the vb code doesn't.

For example the has for 'experts-exchange' in

vb6 code is:             9022fc0e1985bb7c0ac60792ee3fbe3029af0424

in SQL is:                 0x9022FC0E1985BB7C0AC60792EE3FBE3029AF0424

                                 notice "0x"

We extract the "0x" from SQL statement result and both SQL & VB results are the same.

Is there a reason for the "0x" and should we be concerned?
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LVL 22

Expert Comment

by:JesterToo
ID: 41881581
yes, that is not actually a part of the hash.  It is there to signify that the remaining characters are hexidecimal. It is safe to just strip it off as you did.
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Author Comment

by:rayluvs
ID: 41881582
Thanx!!! You really helped us!!
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LVL 22

Expert Comment

by:JesterToo
ID: 41881588
You're welcome.
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