Limit encrypted string length to 20 characters

Hi,
How do I limit encrypted string to 20 characters or 'x' number of characters?
e.g. encrypting "hello" might produce the following out put -> "F1==iI09Poiui7@=1kjuyo" but if I wanted to limit the length 20 characters or less. Is there any
possibility of doing this? If yes, Can someone help me out?
Thanks
Mathew

mathewrond wrote:
There are no constraints on input characters.
I need to encrypt since the input data is confidential.
The resultant encrypted data length can be equal or less than n* 2. This is because we have defined varchar(n*2) as the maximum length for a column in database, so we cannot have encrypted data beyond the length specified in database.You seem to be confusing characters and bytes.
A String of length 'm' is transformed to bytes of length >= 'm' depending on the language and encoding scheme. Let us assume one uses utf-8 encoding then for western languages the length will usually be 'm' or just a bit greater than 'm'. For eastern languages this could be as much as '3*m' bytes but usually closer to '2*m' bytes. So, let as take the multiplier to be 'k' .
Encrypting using a block cipher with a block length 'N' bytes then using PKCS5 padding one will end up with '(k*m/N +1)*N' bytes. If you then Base64 encode these encrypted bytes to convert to characters you will extend the length by a factor of about 4/3 ending up with '(((k*m/N +1)*N + 2)/3)*4' ASCII characters.
Encrypting using a stream cipher you will end up with 'k*m' bytes which after Base64 encoding will become '((k*m+2)/3)*4' ASCII characters. BUT, of course you will need a different key for each value you encrypt. This makes it much more difficult to use and cannot be recommended.
Since you have decided on using a varchar to hold the encrypted data you have to use Base64 encoding (or something similar). If you had chosen varbinary then you could have saved yourself the factor of 4/3 .
Note - all division is assumed to be integer division. e.g. 7/3 == 2

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