Florian Apolloner 37aea82b1c [1.6.x] Fixed #21253 -- PBKDF2 with cached HMAC key
This gives a 2x speed increase compared to the existing implementation.

Thanks to Steve Thomas for the initial patch and Tim Graham for finishing it.

Backport of 1e4f53a6eb8d1816e51eb8bd8f95e704f6b89ead from master.
2013-10-21 19:55:28 +02:00
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