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2017-12-16Scrub keys from memory just before scope end.moneromooo-monero1-0/+43
Partially implements #74. Securely erases keys from memory after they are no longer needed. Might have a performance impact, which I haven't measured (perf measurements aren't generally reliable on laptops). Thanks to @stoffu for the suggestion to specialize the pod_to_hex/hex_to_pod functions. Using overloads + SFINAE instead generalizes it so other types can be marked as scrubbed without adding more boilerplate.
2017-11-27add a memwipe functionmoneromooo-monero1-0/+41
It's meant to avoid being optimized out memory_cleanse lifted from bitcoin