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[ d S) a¨ hashlib module - A common interface to many hash functions.
new(name, data=b'') - returns a new hash object implementing the
given hash function; initializing the hash
using the given binary data.
Named constructor functions are also available, these are faster
than using new(name):
md5(), sha1(), sha224(), sha256(), sha384(), and sha512()
More algorithms may be available on your platform but the above are guaranteed
to exist. See the algorithms_guaranteed and algorithms_available attributes
to find out what algorithm names can be passed to new().
NOTE: If you want the adler32 or crc32 hash functions they are available in
the zlib module.
Choose your hash function wisely. Some have known collision weaknesses.
sha384 and sha512 will be slow on 32 bit platforms.
Hash objects have these methods:
- update(arg): Update the hash object with the bytes in arg. Repeated calls
are equivalent to a single call with the concatenation of all
the arguments.
- digest(): Return the digest of the bytes passed to the update() method
so far.
- hexdigest(): Like digest() except the digest is returned as a unicode
object of double length, containing only hexadecimal digits.
- copy(): Return a copy (clone) of the hash object. This can be used to
efficiently compute the digests of strings that share a common
initial substring.
For example, to obtain the digest of the string 'Nobody inspects the
spammish repetition':
>>> import hashlib
>>> m = hashlib.md5()
>>> m.update(b"Nobody inspects")
>>> m.update(b" the spammish repetition")
>>> m.digest()
b'\xbbd\x9c\x83\xdd\x1e\xa5\xc9\xd9\xde\xc9\xa1\x8d\xf0\xff\xe9'
More condensed:
>>> hashlib.sha224(b"Nobody inspects the spammish repetition").hexdigest()
'a4337bc45a8fc544c03f52dc550cd6e1e87021bc896588bd79e901e2'
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