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Jason Aslakson

2008-Apr-21 15:52 UTC

translating Java encoding/hashing code to Ruby in a rails ap

Good Day to all!

I am trying desperately to solve the following problem and need the help
of a Rails/Ruby guru. I am receiving data via a POST request from a
remote web application. The information is composed of 5 fields of data
plus a sixth field  that''s the encoded version of the first 5 bits plus
a shared secret. The problem I am having is converting the sample code I
was given (Java) to Ruby so that I can re-hash the data in my Rails app
to confirm the validity of the data.

The allDataElements string is the same for both sets of code - a string
of key, value pairs from the POST plus the shared secret

"userID=123456&timeStamp=04/21/2008&firstName=myfirstname&lastName=mylastname&firm=G
mycompanyName&sharedSecret=SOMEREALLYCRYPTICTEXT"

Once I hash this text I should be able to compare it to the hashed value
I was passed in the POST request.

Here''s the Java code:
    //Generate hash from profile data in hashmap object
    MessageDigest md = MessageDigest.getInstance("MD5");
    byte[] mashedHash = md.digest(allDataElements.getBytes("UTF-8"));
    BASE64Encoder encoder = new BASE64Encoder();
    //Encode to pass as a printable String to The Hartford website
    yourhashedKey = encoder.encode(mashedHash);

Here''s my ruby code:

    yourhashedKey = Base64.encode64(Digest::MD5.digest(allDataElements))

The return value from my code does not match what I receive from the
Java code. I believe it has to do with teh UTF-8 parameter in the
getBytes function. Can someone help? I''m desperate!!!!

Thank you for your help.
-- 
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Frederick Cheung

2008-Apr-21 16:52 UTC

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Re: translating Java encoding/hashing code to Ruby in a rails ap

On 21 Apr 2008, at 16:52, Jason Aslakson wrote:
>
>
> Once I hash this text I should be able to compare it to the hashed  
> value
> I was passed in the POST request.
>
> Here''s the Java code:
>    //Generate hash from profile data in hashmap object
>    MessageDigest md = MessageDigest.getInstance("MD5");
>    byte[] mashedHash =
md.digest(allDataElements.getBytes("UTF-8"));
>    BASE64Encoder encoder = new BASE64Encoder();
>    //Encode to pass as a printable String to The Hartford website
>    yourhashedKey = encoder.encode(mashedHash);
>
> Here''s my ruby code:
>
>    yourhashedKey = >
Base64.encode64(Digest::MD5.digest(allDataElements))
>
Does it work if all of your data is just plain ascii? in that case the  
utf-8 ness wouldn''t make any difference.
How is allDataElements computed ? (both ruby & java )

Fred> The return value from my code does not match what I receive from the
> Java code. I believe it has to do with teh UTF-8 parameter in the
> getBytes function. Can someone help? I''m desperate!!!!
>
> Thank you for your help.
> -- 
> Posted via http://www.ruby-forum.com/.
>
> >

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Jason Aslakson

2008-Apr-21 17:03 UTC

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Re: translating Java encoding/hashing code to Ruby in a rails ap

Fred,

Thanks for getting back to me on this one. Unfortunately I don''t have 
any insight/ability to test out what happens in the Java code as it''s
on
another company''s system. I have a request into them to try it without 
the UTF-8 part so I''ll have to wait and see on that front.

However, here''s how the allDataElements string is built. Basically, I 
just string together the 5 key/value pairs as if it were a GET request 
and then tack on the sharedSecret value. Here''s the sample Java code I 
received (sytax errors and all). I have verified that only the variables 
listed in allDataElements are included in the hash even though there are 
other variables listed in the sample code.

  String secretKey  = "";       //key we share
  String userID     = "";  //HIFP user id
  String timeStamp  = "";  //timeStamp must be in MM/DD/YYYY
  String firstName = "";
  String lastName = "";
  String firm = "";
  String emailAddress = "";
  String address1 = "";
  String address2 = "";
  String city = "";
  String state = "";
  String zip = "";
  String Phone = "";
  String hashedKey = "";

  String allDataElements = "userID=" + userID
                         + "&timeStamp=" + timeStamp
                         + "&firstName=" + firstName);}
                         + "&lastName=" + lastName);}
                         + "&firm=" + firm);}
                         + "&sharedSecret=" + secretKey);
try
  {
    //Generate hash from profile data in hashmap object
    MessageDigest md = MessageDigest.getInstance("MD5");
    byte[] mashedHash = md.digest(allDataElements.getBytes("UTF-8"));
    BASE64Encoder encoder = new BASE64Encoder();
    //Encode to pass as a printable String to The Hartford website
    yourhashedKey = encoder.encode(mashedHash);
  }
  catch (Exception e)
  {
    System.out.println("EMIvul.jsp - Exception: " + e.toString() );
    yourhashedKey = null;
  }

Somehow I need to turn this into Ruby. I had thought I would be fine 
with Base64.encode64(Digest::MD5.digest(allDataElements)) as I have done 
this type of thing from C# to Ruby before and it seemed to work out. The 
only difference is the getBytes("UTF-8") part.

Thank you for your help. I sincerely appreciate any insight you may have 
to offer.

Frederick Cheung wrote:> On 21 Apr 2008, at 16:52, Jason Aslakson wrote:
> 
>>    BASE64Encoder encoder = new BASE64Encoder();
>>    //Encode to pass as a printable String to The Hartford website
>>    yourhashedKey = encoder.encode(mashedHash);
>>
>> Here''s my ruby code:
>>
>>    yourhashedKey = >>
Base64.encode64(Digest::MD5.digest(allDataElements))
>>
> 
> Does it work if all of your data is just plain ascii? in that case the
> utf-8 ness wouldn''t make any difference.
> How is allDataElements computed ? (both ruby & java )
> 
> Fred
-- 
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Jason Aslakson

2008-Apr-21 17:57 UTC

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Re: translating Java encoding/hashing code to Ruby in a rails ap

Everyone,

So, it turns out that the sample code from the client was wrong. Even 
though I had questioned the naming of the ''firmName'' variable
as ''firm''
I had not tried changing the variable name until just now. I have 
notified the client that they should update their sample code.

I thank Fred for his generous willingness to help and I hope that 
someone finds the code useful down the road as it does turn out that:

    MessageDigest md = MessageDigest.getInstance("MD5");
    byte[] mashedHash = md.digest(allDataElements.getBytes("UTF-8"));
    BASE64Encoder encoder = new BASE64Encoder();
    //Encode to pass as a printable String to The Hartford website
    yourhashedKey = encoder.encode(mashedHash);

can be translated into ruby as

yourhashedKey = Base64.encode64(Digest::MD5.digest(allDataElements))
 You probably want to formalize the code more, but you get the idea.

Best,

Jason
-- 
Posted via http://www.ruby-forum.com/.

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Rails - Apr 2008 - translating Java encoding/hashing code to Ruby in a rails ap

translating Java encoding/hashing code to Ruby in a rails ap

Re: translating Java encoding/hashing code to Ruby in a rails ap

Re: translating Java encoding/hashing code to Ruby in a rails ap

Re: translating Java encoding/hashing code to Ruby in a rails ap