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2013-06-28T12:27:47.623
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Unfortunately, I'm not sure that this is going to be possible using Apex. I created a test Java program (which works against the Google API) to observe the differences between what Java produces vs Apex. I noted the signatures generated from the two were different which narrowed it down to the output of the <code>Crypto.sign()</code> method. I found <a href="http://wiki.developerforce.com/index.php?title=Apex_Crypto_Class&action=edit" rel="nofollow">this</a> link which gives the following info: <blockquote> The Apex Crypto class provides support for Digital Signatures with the sign() method. The following considerations apply: <ul> <li>The two algorithms are RSA and RSA-SHA1, which are functionally equivalent. </li> <li>A PKCS8 formatted private key in base64 decoded form is required. This private key should not be hardcoded in the Apex script but should be stored in a protected custom setting or a encrypted fields in a custom table.</li> <li>It is equivalent to the Java Signature.sign() class method using "SHA1withRSA".</li> <li>In C#, it is the equivalent of (1) signing the clear text using SHA1Managed.ComputeHash() and (2) Signing using RSACryptoServiceProvider.ComputeHash() against the resulting hash.</li> <li>Functionally, it will compute a SHA1 digest from clear text and encrypt the digest using RSA with the provided private key.</li> </ul> </blockquote> I have highlighted the key issue here, I believe you need the equivalent of SHA256withRSA which does not seem to be an option with the Crypto class (at least not that I can figure out). So, in summary I think your code is correct but the signature being generated is not.
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1. POForce.com OAuth 2.0 JWT to Google Service Account Fusion Table API 400 Bad Request Invalid_Grant
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1. USPhil Hawthorn
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