on 2021 Dec 09 12:05 PM
Hi,
To store (and use) our users password in the database, we use the couple of function ENCRYPT and DECRYPT.
To encrypt the password we use the following instruction :
UPDATE USR SET UsrPass = ENCRYPT('toto', 'TheVeryLongKey', '(AES256') WHERE ...
Lately we decide to change the key of encryption, so to get all the users password of a database we execute the folowing select :
SELECT UsrID, CAST(DECRYPT(UsrPass, 'TheVeryLongKey, 'AES256') AS LONG NVARCHAR) AS UsrPass FROM USR ORDER BY UsrID"
For most of the our client database we didn't have problems but on two database we have this error : ERROR : -851 08W63 Decryption error: Input must be a multiple of 16 bytes in length for AES
I d'ont understand why we have this error and how to "fix" it.
I finally found the solution : the "usrpass" was not encrypted for only one user in those twoe database !
Thank you all for your responses. I will have a little chit chat with some people on monday :).
Fun fact, when I execute "SELECT UsrID, CAST(DECRYPT(UsrPass, 'TheVeryLongKey', 'AES256') AS LONG NVARCHAR) AS UsrPass FROM USR ORDER BY UsrID" in interactive sql I don't have the error message, it manage to give me a readable string.
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