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This commit adds in the actions package. This package will be the
highest-level interface to the fscrypt packages. The public functions
in this package will be called directly from cmd/fscrypt.
The actions added in this commit pertain to creating and reading the
fscrypt global config file "fscrypt.conf". The challenging part about
creating this file is finding the correct hashing parameters for the
desired time target.
The getHashingCosts() function finds the desired costs by doubling the
costs and running the passphrase hash until the target is exceeded.
Then, a cost estimate is obtained using a linear interpolation between
the last two costs (and their time results).
Change-Id: I4a0eaf4856ec4ff49eb4360da3267f7caa9d07b2
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