http://hg.viff.dk/viff/rev/e810a006c2bf
changeset: 1100:e810a006c2bf
user: Martin Geisler <[email protected]>
date: Mon Feb 09 10:50:57 2009 +0100
summary: Better documentation for shamir_share method.
diffstat:
1 file changed, 26 insertions(+)
viff/passive.py | 26 ++++++++++++++++++++++++++
diffs (36 lines):
diff -r cc706ddd9376 -r e810a006c2bf viff/passive.py
--- a/viff/passive.py Wed Feb 04 23:40:56 2009 +0100
+++ b/viff/passive.py Mon Feb 09 10:50:57 2009 +0100
@@ -440,6 +440,32 @@
unless there is only one inputter in which case the
share is returned directly.
+ In code it is used like this::
+
+ a, b, c = runtime.shamir_share([1, 2, 3], Zp, x)
+
+ where ``Zp`` is a field and ``x`` is a Python integer holding
+ the input of each player (three inputs in total).
+
+ If only a subset of the players provide input it looks like
+ this::
+
+ if runtime.id == 1:
+ a = runtime.shamir_share([1], Zp, x)
+ else:
+ a = runtime.shamir_share([1], Zp)
+
+ Instead of branching when calling :meth:`shamir_share`, one
+ can give ``None`` as input::
+
+ if runtime.id == 1:
+ x = int(raw_input("Input x: "))
+ else:
+ x = None
+ a = runtime.shamir_share([1], Zp, x)
+
+ which might be practical in some cases.
+
Communication cost: n elements transmitted.
"""
assert number is None or self.id in inputters
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