| #!/usr/bin/env python2.5 |
| # |
| # Copyright 2008 Google Inc. |
| # |
| # Licensed under the Apache License, Version 2.0 (the "License"); |
| # you may not use this file except in compliance with the License. |
| # You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, software |
| # distributed under the License is distributed on an "AS IS" BASIS, |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| # See the License for the specific language governing permissions and |
| # limitations under the License. |
| |
| """Common utilities. |
| """ |
| |
| import hashlib |
| import struct |
| |
| |
| def Bin2Hex(hash): |
| hexchars = [] |
| for i in struct.unpack('%dB' % (len(hash),), hash): |
| hexchars.append('%02x' % (i,)) |
| return ''.join(hexchars) |
| |
| def GetHash256(expr): |
| return hashlib.sha256(expr).digest() |
| |
| def IsFullHash(expr): |
| return len(expr) == 32 |
