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Java String encryption and decryption without special charectors

Posted on 2013-06-17
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Last Modified: 2013-06-17
How can we encrypt a string without any special characters.

For example xw8rD/uTSW0=, here without / and = .

I am using Base64Encoder.
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Question by:sasidhar1229
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6 Comments
 
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Expert Comment

by:mccarl
ID: 39253279
I am using Base64Encoder.
Well, the Base64 spec DOES use    / + =   so you can't have a string that is both Base64 AND does not have those characters.

The only "standard" base-n encoding that contains only alphanumeric characters is Base16 but that results in a much larger representation on the input. Check this link for the details of each scheme, http://www.ietf.org/rfc/rfc4648.txt

Can you explain your requirement for not wanting the special characters? That may help us further to understand what you are trying to do.
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Expert Comment

by:CEHJ
ID: 39253956
I am using Base64Encoder.
... which is actually not much to do with encryption. The purpose of that is to encode arbitrary data such that it can be represented as a String
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Author Comment

by:sasidhar1229
ID: 39255187
Can you explain your requirement for not wanting the special characters?

I am using UrlRewriteFilter for clean url in struts.

This is the rule pattern in urlrewrite.xml

<rule>
        <from>search/(.*)</from>
        <to>/searchAction?keyword=$1</to>
</rule>

Now the sample url is :

 search/xw8rD/uTSW0=

Here the extra / in keyword breaking the rule. And it is not forwarding to the searchAction.

in jsp I encrypted the keyword, even though it's not working.

search/xw8rD%2FuTSW0%3D .
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Accepted Solution

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mccarl earned 500 total points
ID: 39255206
By Base64Encoder, are you referring to "sun.misc.Base64Encoder"?

If so, apart from the fact that you shouldn't really use internal classes, you probably should change to a more full featured encoder. Have a look at Apache Commons version...

http://commons.apache.org/proper/commons-codec/apidocs/org/apache/commons/codec/binary/Base64.html

It has methods (such as "encodeBase64URLSafeString") that use - and _ instead of + and /   and also don't add extra padding (ie. the = at the end). The purpose of these methods are for exactly what you are trying to do!
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Author Comment

by:sasidhar1229
ID: 39255211
Hi,

Exactly what I found just now.

 public String encrypt(String str) {
        try {
            // Encode the string into bytes using utf-8
            byte[] utf8 = str.getBytes("UTF8");

            // Encrypt
            byte[] enc = ecipher.doFinal(utf8);

            // Encode bytes to base64 to get a string
            //return new sun.misc.BASE64Encoder().encode(enc);
           
            return Base64.encodeBase64URLSafeString(enc);

        } catch (javax.crypto.BadPaddingException e) {
        } catch (IllegalBlockSizeException e) {
        } catch (UnsupportedEncodingException e) {
        } catch (java.io.IOException e) {
        }
        return null;
    }

Thanks for your reply.
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LVL 35

Expert Comment

by:mccarl
ID: 39255214
Not a problem, glad to help!
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