md5
— MD5 消息摘要算法
¶
从 2.5 版起弃用：
使用
hashlib
模块代替。
This module implements the interface to RSA’s MD5 message digest algorithm (see also Internet
RFC 1321
). Its use is quite straightforward: use
new()
to create an md5 object. You can now feed this object with arbitrary strings using the
update()
method, and at any point you can ask it for the
digest
(a strong kind of 128-bit checksum, a.k.a. “fingerprint”) of the concatenation of the strings fed to it so far using the
digest()
方法。
For example, to obtain the digest of the string
'Nobody inspects the spammish
repetition'
:
>>> import md5
>>> m = md5.new()
>>> m.update("Nobody inspects")
>>> m.update(" the spammish repetition")
>>> m.digest()
'\xbbd\x9c\x83\xdd\x1e\xa5\xc9\xd9\xde\xc9\xa1\x8d\xf0\xff\xe9'
更浓缩：
>>> md5.new("Nobody inspects the spammish repetition").digest()
'\xbbd\x9c\x83\xdd\x1e\xa5\xc9\xd9\xde\xc9\xa1\x8d\xf0\xff\xe9'
The following values are provided as constants in the module and as attributes of the md5 objects returned by
new()
:
md5.
digest_size
¶
The size of the resulting digest in bytes. This is always
16
.
The md5 module provides the following functions:
md5.
new
(
[
arg
]
)
¶
Return a new md5 object. If
arg
is present, the method call
update(arg)
is made.
md5.
md5
(
[
arg
]
)
¶
For backward compatibility reasons, this is an alternative name for the
new()
函数。
An md5 object has the following methods:
md5.
update
(
arg
)
¶
Update the md5 object with the string
arg
. Repeated calls are equivalent to a single call with the concatenation of all the arguments:
m.update(a);
m.update(b)
相当于
m.update(a+b)
.
md5.
digest
(
)
¶
Return the digest of the strings passed to the
update()
method so far. This is a 16-byte string which may contain non-ASCII characters, including null bytes.
md5.
hexdigest
(
)
¶
像
digest()
except the digest is returned as a string of length 32, containing only hexadecimal digits. This may be used to exchange the value safely in email or other non-binary environments.
md5.
copy
(
)
¶
Return a copy (“clone”) of the md5 object. This can be used to efficiently compute the digests of strings that share a common initial substring.
另请参阅
sha
Similar module implementing the Secure Hash Algorithm (SHA). The SHA algorithm is considered a more secure hash.