update varchar data to binary(16)

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SQL-Server-2008

Hello,

I have my password column with varchar(50) datatype. now i have created a new column NewPassword binary(16).
I want to convert password varchar data to binary(16) format in NewPassword column.

How can i do it?

Thanks.

Posted 2-May-14 21:22pm

kk2014

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OriginalGriff · Answer 1 · 2014-05-02T21:42:00

We can't answer that.

Firstly, there is no way to pack 50 characters into 16 bytes: even if you only had A-Z and a couple of other characters in there, you couldn't guarantee to "squash" it down: 26 characters (call it 32 to make the math easy) needs 50 * 5 bits = 250 and 16 bytes only has 128 bits.

Secondly, the only way you will get it in there is to hash it - and since we have no idea what hashing algorithm you are thinking of useing, we can't tell you how to do it in SQL - I wouldn't even if I could, personally as I'd want to use the "real" code to make sure it worked when I checked them.