thread safety in gnutls [was: Re: Handshake and verification]

[Daniel Kahn Gillmor]

On 12/09/2009 10:29 AM, lfinsto at gwdg.de wrote:
> No, I had actually read this, but forgotten about it.  However, when I
> tried it, i.e.,

 [...]

> I got this error from the call to `generate_rsa_params':
> 
> Ohhhh jeeee: operation is not possible without initialized secure memory
> Aborted

You're probably using a gcrypt version earlier than 1.4.3, when they
added a default initialization of secure memory.  Try adding the
following after the THREAD_CBS, but before the global_init to initialize
gcrypt's secure memory explicitly:

  gcry_control (GCRYCTL_SUSPEND_SECMEM_WARN);
  gcry_control (GCRYCTL_INIT_SECMEM, 32768, 0);
  gcry_control (GCRYCTL_RESUME_SECMEM_WARN);

for further reference, you can read here:

http://www.gnupg.org/documentation/manuals/gcrypt/Initializing-the-library.html

but unfortunately, the documentation for initializing gcrypt isn't
terribly clear.  I've asked for improved documentation on that recently,
but haven't gotten much of a response:

 http://lists.gnupg.org/pipermail/gcrypt-devel/2009-October/001504.html

I'm afraid i don't know the library well enough myself to write improved
documentation for it, though.

	--dkg

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