Linux下計算md5sum，sha1sum，crc：
命令 輸出
$md5sum hello f19dd746bc6ab0f0155808c388be8ff0 hello
$sha1sum hello 79e560a607e3e6e9be2c09a06b7d5062cb5ed566 hello
$crc32 hello 327213a2
Python也能做這個工作，其中md5和sha1需import hashlib, crc32可以import zlib
#test.py
#!/usr/bin/env python
from hashlib import md5, sha1
from zlib import crc32
import sys
def getMd5(filename): #計算md5
mdfive = md5()
with open(filename, ‘rb’) as f:
mdfive.update(f.read())
return mdfive.hexdigest()
def getSha1(filename): #計算sha1
sha1Obj = sha1()
with open(filename, ‘rb’) as f:
sha1Obj.update(f.read())
return sha1Obj.hexdigest()
def getCrc32(filename): #計算crc32
with open(filename, ‘rb’) as f:
return crc32(f.read())
if len(sys.argv) < 2:
print(‘You must enter the file’)
exit(1)
elif len(sys.argv) > 2:
print(‘Only one file is permitted’)
exit(1)
filename = sys.argv[1]
print(’{:8} {}’.format(‘md5:’, getMd5(filename)))
print(’{:8} {}’.format(‘sha1:’, getSha1(filename)))
print(’{:8} {:x}’.format(‘crc32:’, getCrc32(filename)))
$python test.py hello
結果：
md5: f19dd746bc6ab0f0155808c388be8ff0
sha1: 79e560a607e3e6e9be2c09a06b7d5062cb5ed566
crc32: 327213a2