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POHow do I handle keys when trying to use TripleDES to encrypt transactions between GWT client and perl server?
 

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  1. POHow do I handle keys when trying to use TripleDES to encrypt transactions between GWT client and perl server?
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    <p>I have a GWT client talking to a perl server via JSON over HTTP. It works great, but there are some privacy issues and I need to encrypt the transactions. After doing a bit a research it seems as though the easiest/best supported option is to user TripleDES, with gwt-crypto for the client and Crypt:CBC for the server. The problem is I can't figure out how to use the same key for both ends, because how you set them up appears to be completely different. On the java/gwt side I am doing the following:</p> <pre><code>_cipher.setKey(Hex.decode("dc7c62768f0d9d514373d520438ff8f8")); // 16 bytes </code></pre> <p>and on the perl side I am doing:</p> <pre><code>my $cipher = Crypt::CBC-&gt;new( -key =&gt; 'dc7c62768f0d9d514373d520438ff8f8', -cipher =&gt; 'DES_EDE3'); </code></pre> <p>I have tried various key schemes, but it seems if I make gwt happy then perl isn't, and vica versa. For example, as far as I can tell the following perl should work, but I get an "Invalid key" error when I try it:</p> <pre><code>my $iv = Crypt::CBC-&gt;random_bytes(8); my $key = pack("H*", 'dc7c62768f0d9d514373d520438ff8f8'); my $cipher = Crypt::CBC-&gt;new( -key =&gt; $key, -literal_key =&gt; 1, -keysize =&gt; 16, -header =&gt; 'none', -padding =&gt; 'standard', -iv =&gt; $iv, -cipher =&gt; 'DES_EDE3' ); </code></pre> <p>So, I think I could eventually figure out the coding issues, what I am having trouble it jumping through the hoops to tell each side what key to use. Any help is greatly appreciated.</p>
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    1. USJames B
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    1. COIs there an architectural reason that the privacy afforded by simlply sending the JSON over HTTPS (SSL) is insufficient?
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      1. USDavid-SkyMesh
    2. CONo, there isn't a hard requirement to encrypt the transactions with anything beyond HTTPS. I just wanted an additional layer to give me a warm fuzzy and brag about.
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      1. POHow do I handle keys when trying to use TripleDES to encrypt transactions between GWT client and perl server?
      1. USJames B
    3. COOh, I forgot to mention that I finally figured out that I needed to use a 24 byte key, and that got me a little farther, but I eventually gave up due to the hashing issue.
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      1. USJames B
 

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