Yep that was it. Thanks for the help! I have also found a case where a hub
(not google) is sending the signature in capital hex representation, e.g.
7B so I fixed my logic to accept that as well.
--Kireet
On Thursday, June 6, 2013 9:36:27 AM UTC-4, Roman Perepelitsa wrote:
>
> Hi Kireet,
>
> This took a bit longer than expected but I think I know where the problem
> lies.
>
> You have this clause:
>
> if ((calcSignature.length() % 2) != 0) {
> calcSignature = "0" + calcSignature;
> }
>
> It "fixes" signatures that start with one leading zero, such
> as 02c8a97dd9b808f3d2dcce9581fd883ecc5f7f2a, but it's helpless against
> signatures with several leading zeros, such as
> 00c8a97dd9b808f3d2dcce9581fd883ecc5f7f2a. In other
> words, calcSignature.length() can be less than 40 when you return it.
>
> To fix this problem, change your code to the following:
>
> while (calcSignature.length() < 40) {
> calcSignature = "0" + calcSignature;
> }
>
> HTH,
> Roman.
>
> On Sun, May 26, 2013 at 4:31 AM, Kireet <[email protected]
> <javascript:>>wrote:
>
>> I have implemented some PuSH subscription code and usually it works well.
>> But on about 1% of the pushes I get a signature mismatch, especially with
>> this feed, http://feeds.feedburner.com/TechCrunch (wordpress). I have
>> had occasional issues with the google hub also, e.g.
>> http://looksgoodworkswell.blogspot.com/feeds/posts/default
>>
>> My code is below (java). It's a bit hard to debug, I captured the content
>> bytes as a hex string and ran my signature algorithm on it and it matched
>> what my code was doing, but was different than the value produced by the
>> hub. Beyond that I am not sure what to try next.
>>
>> Mac mac = Mac.getInstance("HmacSHA1");
>>
>> String secret = tokenize(feedUri);
>>
>> mac.init(new SecretKeySpec(secret.getBytes(), "HmacSHA1"));
>>
>>
>> byte[] digest = mac.doFinal(payload);
>>
>> BigInteger hash = new BigInteger(1, digest);
>>
>> String calcSignature = hash.toString(16);
>>
>> if ((calcSignature.length() % 2) != 0) {
>>
>> calcSignature = "0" + calcSignature;
>>
>> }
>>
>> return calcSignature;
>>
>>
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>>
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>
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