[OTR-dev] Secure memory

[jvoisin]

Hello,
while playing with compiler optimization and reading the norm to write a
nice wipe_memory(char* mem, size_t len) function, I stumbled upon issue
23[1]. It seems that libgcrypt can now provide secure memory to
application running as non-root. What about using this in libotr instead
of a custom implementation?

I pushed a patch on the `secmem` branch, that you can find attached to
this mail.

Cheers,

1. https://bugs.otr.im/issues/23
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