use node cluster workers everywhere.

[jaeh]

using nodejs cluster and running all crypto functions in workers provides a lot of isolation in comparison to function closures (used now).

master:

• wait for request
• spawn a worker on request to sign, encrypt or verify
• send secret to worker

worker

• generate public/private key pair inside the worker, derived from secret
• sign, encrypt and/or verify using the keypair
• overwrite the keypair
• send the signed/encrypted/verified result back to master
• die.

master

• receive returned result, send it to callee.

caveat:

see if performance suffers too much.
time is relative.