tahoe-lafs/src/allmydata/util/hashutil.py

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from allmydata.Crypto.Hash import SHA256
def netstring(s):
return "%d:%s," % (len(s), s,)
def tagged_hash(tag, val):
s = SHA256.new()
s.update(netstring(tag))
s.update(val)
return s.digest()
def tagged_pair_hash(tag, val1, val2):
s = SHA256.new()
s.update(netstring(tag))
s.update(netstring(val1))
s.update(netstring(val2))
return s.digest()