diff options
Diffstat (limited to 'tools/certtools.py')
| -rw-r--r-- | tools/certtools.py | 108 |
1 files changed, 99 insertions, 9 deletions
diff --git a/tools/certtools.py b/tools/certtools.py index 6a144c9..31045b9 100644 --- a/tools/certtools.py +++ b/tools/certtools.py @@ -105,6 +105,17 @@ def get_proof_by_hash(baseurl, hash, tree_size): print "ERROR:", e.read() sys.exit(1) +def get_consistency_proof(baseurl, tree_size1, tree_size2): + try: + params = urllib.urlencode({"first":tree_size1, + "second":tree_size2}) + result = \ + urllib2.urlopen(baseurl + "ct/v1/get-sth-consistency?" + params).read() + return json.loads(result)["consistency"] + except urllib2.HTTPError, e: + print "ERROR:", e.read() + sys.exit(1) + def tls_array(data, length_len): length_bytes = struct.pack(">Q", len(data))[-length_len:] return length_bytes + data @@ -340,16 +351,24 @@ def get_certs_from_zipfiles(zipfiles, firstleaf, lastleaf): except KeyError: return -def get_merkle_hash_64k(store, blocknumber, write_to_cache=False): - hashfilename = "%s/%04x.64khash" % (store, blocknumber) - try: - hash = base64.b16decode(open(hashfilename).read()) - assert len(hash) == 32 - return ("hash", hash) - except IOError: - pass +def get_merkle_hash_64k(store, blocknumber, write_to_cache=False, treesize=None): firstleaf = blocknumber * 65536 lastleaf = firstleaf + 65535 + if treesize != None: + assert firstleaf < treesize + usecache = lastleaf < treesize + lastleaf = min(lastleaf, treesize - 1) + else: + usecache = True + + hashfilename = "%s/%04x.64khash" % (store, blocknumber) + if usecache: + try: + hash = base64.b16decode(open(hashfilename).read()) + assert len(hash) == 32 + return ("hash", hash) + except IOError: + pass firstfile = firstleaf / 10000 lastfile = lastleaf / 10000 zipfiles = {} @@ -364,10 +383,81 @@ def get_merkle_hash_64k(store, blocknumber, write_to_cache=False): calculated_hash = tree[-1][0] for zf in zipfiles.values(): zf.close() - if len(layer0) != 65536: + if len(layer0) != lastleaf - firstleaf + 1: return ("incomplete", (len(layer0), calculated_hash)) if write_to_cache: f = open(hashfilename, "w") f.write(base64.b16encode(calculated_hash)) f.close() return ("hash", calculated_hash) + +def get_tree_head(store, treesize): + merkle_64klayer = [] + + for blocknumber in range(0, (treesize / 65536) + 1): + (resulttype, result) = get_merkle_hash_64k(store, blocknumber, treesize=treesize) + if resulttype == "incomplete": + print >>sys.stderr, "Couldn't read until tree size", treesize + (incompletelength, hash) = result + print >>sys.stderr, "Stopped at", blocknumber * 65536 + incompletelength + sys.exit(1) + assert resulttype == "hash" + hash = result + merkle_64klayer.append(hash) + #print >>sys.stderr, print blocknumber * 65536, + sys.stdout.flush() + tree = build_merkle_tree(merkle_64klayer) + calculated_root_hash = tree[-1][0] + return calculated_root_hash + +def get_intermediate_hash(store, treesize, level, index): + if level >= 16: + merkle_64klayer = [] + + levelsize = (2**(level-16)) + + for blocknumber in range(index * levelsize, (index + 1) * levelsize): + if blocknumber * (2 ** 16) >= treesize: + break + #print "looking at block", blocknumber + (resulttype, result) = get_merkle_hash_64k(store, blocknumber, treesize=treesize) + if resulttype == "incomplete": + print >>sys.stderr, "Couldn't read until tree size", treesize + (incompletelength, hash) = result + print >>sys.stderr, "Stopped at", blocknumber * 65536 + incompletelength + sys.exit(1) + assert resulttype == "hash" + hash = result + #print "block hash", base64.b16encode(hash) + merkle_64klayer.append(hash) + #print >>sys.stderr, print blocknumber * 65536, + sys.stdout.flush() + tree = build_merkle_tree(merkle_64klayer) + return tree[-1][0] + else: + levelsize = 2 ** level + firstleaf = index * levelsize + lastleaf = firstleaf + levelsize - 1 + #print "firstleaf", firstleaf + #print "lastleaf", lastleaf + assert firstleaf < treesize + lastleaf = min(lastleaf, treesize - 1) + #print "modified lastleaf", lastleaf + firstfile = firstleaf / 10000 + lastfile = lastleaf / 10000 + #print "files", firstfile, lastfile + zipfiles = {} + for i in range(firstfile, lastfile + 1): + try: + zipfiles[i] = zipfile.ZipFile("%s/%04d.zip" % (store, i)) + except IOError: + break + certs = get_certs_from_zipfiles(zipfiles, firstleaf, lastleaf) + layer0 = [get_hash_from_certfile(cert) for cert in certs] + #print "layer0", repr(layer0) + tree = build_merkle_tree(layer0) + calculated_hash = tree[-1][0] + for zf in zipfiles.values(): + zf.close() + assert len(layer0) == lastleaf - firstleaf + 1 + return calculated_hash |