http://hg.viff.dk/viff/rev/ecd0f77f5243
changeset: 1146:ecd0f77f5243
user: Marcel Keller <[email protected]>
date: Wed Feb 25 17:16:38 2009 +0100
summary: Cache PRFs.
diffstat:
1 file changed, 20 insertions(+), 10 deletions(-)
viff/config.py | 30 ++++++++++++++++++++----------
diffs (55 lines):
diff -r 58576bfc42e8 -r ecd0f77f5243 viff/config.py
--- a/viff/config.py Wed Feb 25 15:39:34 2009 +0100
+++ b/viff/config.py Wed Feb 25 17:16:38 2009 +0100
@@ -49,6 +49,8 @@
self.seckey = seckey
self.keys = keys
self.dealer_keys = dealer_keys
+ self.prfs_cache = {}
+ self.dealers_cache = {}
def prfs(self, modulus):
"""Retrieve PRSS PRFs.
@@ -60,10 +62,15 @@
Return a mapping from player subsets to :class:`viff.prss.PRF`
instances.
"""
- prfs = {}
- for subset, key in self.keys.iteritems():
- prfs[subset] = PRF(key, modulus)
+ if (modulus in self.prfs_cache):
+ prfs = self.prfs_cache[modulus]
+ else:
+ prfs = {}
+ for subset, key in self.keys.iteritems():
+ prfs[subset] = PRF(key, modulus)
+ self.prfs_cache[modulus] = prfs
# TODO: the PRFs ought to be cached
+ # Yes, they probably should.
return prfs
def dealer_prfs(self, modulus):
@@ -75,13 +82,16 @@
Return a mapping from player subsets to :class:`viff.prss.PRF`
instances.
"""
- dealers = {}
- for dealer, keys in self.dealer_keys.iteritems():
- prfs = {}
- for subset, key in keys.iteritems():
- prfs[subset] = PRF(key, modulus)
- dealers[dealer] = prfs
- # TODO: the PRFs ought to be cached
+ if (modulus in self.dealers_cache):
+ dealers = self.dealers_cache[modulus]
+ else:
+ dealers = {}
+ for dealer, keys in self.dealer_keys.iteritems():
+ prfs = {}
+ for subset, key in keys.iteritems():
+ prfs[subset] = PRF(key, modulus)
+ dealers[dealer] = prfs
+ self.dealers_cache[modulus] = dealers
return dealers
def __repr__(self):
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