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MAC differs 1.3 vs 1.4

 
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I am creating an MD5 Message Authentication Code to exchange with a third-party application. I need to get the MD5 token for the url string I pass to them. When I use JDK 1.4.2.01 the third-party accepts my security token. However; when I use JDK 1.3.1.09 and the optional JCE 1.2.2, the token is different for the same string, and gets rejected by the third-party.

Here is my 1.4.2 code:




Here is my 1.3.1 code



The byte array produced by the following line:
byte[] digest = mac.doFinal(dataBytes);
is apparantly incorrect with 1.3.1, but okay with 1.4.2.
Can anyone help me with this?
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