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大文件如果一次性读入计算,会占用大量内存,可以分块读取、分块计算,效果与一次读取计算相同。代码如下:
import hashlib
import base64
'''
sha1 file with filename (SHA1)
'''
def SHA1FileWithName(fineName, block_size=64 * 1024):
with open(fineName, 'rb') as f:
sha1 = hashlib.sha1()
while True:
data = f.read(block_size)
if not data:
break
sha1.update(data)
retsha1 = base64.b64encode(sha1.digest())
return retsha1
'''
md5 file with filename (MD5)
'''
def MD5FileWithName(fineName, block_size=64 * 1024):
with open(fineName, 'rb') as f:
md5 = hashlib.md5()
while True:
data = f.read(block_size)
if not data:
break
md5.update(data)
retmd5 = base64.b64encode(md5.digest())
return retmd5