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Author Topic: OpenSSL ciphers and App Engine  (Read 2551 times)
Gavin Andresen
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October 22, 2010, 04:06:08 PM

I spent way too many hours yesterday trying to figure out why my Google App Engine code couldn't urlfetch from my -rpcssl bitcoin process, so I'm posting this to hopefully save somebody else from the frustration.

I made Bitcoin's HTTPS-JSON-RPC code fussy about what openssl ciphers it supports on purpose; by default, it doesn't accept SSLV1 connections or older, weaker ciphers or hashing algorithms (like single-DES and MD5).

Surprisingly, Google's App Engine urlfetch service currently ONLY supports RC4/DES/MD5/SHA, so, by default, App Engine can't talk via https to Bitcoin.  The workaround is easy (use the -rpcsslciphers= option to override the ciphers bitcoin will accept), and I'll document this on the rpcssl wiki page.

And hopefully Google will get with the program and support better encryption...

How often do you get the chance to work on a potentially world-changing project?
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October 28, 2010, 03:23:37 PM

Thanks for that. You might feel that you're mailing this stuff into a void but I have taken note for my own project and I appreciate not having to work it out for myself.

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