This example works fine example:
import hashlib
m = hashlib.md5()
m.update(b"Nobody inspects")
r= m.digest()
print(r)
Now, I want to do the same thing but with a variable: var= "hash me this text, please". How could I do it following the same logic of the example ?
The hash.update() method requires bytes, always.
Encode unicode text to bytes first; what you encode to is a application decision, but if all you want to do is fingerprint text for then UTF-8 is a great choice:
m.update(var.encode('utf8'))
The exception you get when you don't is quite clear however:
>>> import hashlib
>>> hashlib.md5().update('foo')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: Unicode-objects must be encoded before hashing
If you are getting the hash of a file, open the file in binary mode instead:
from functools import partial
hash = hashlib.md5()
with open(filename, 'rb') as binfile:
for chunk in iter(binfile, partial(binfile.read, 2048)):
hash.update(chunk)
print hash.hexdigest()
.digest() multiple times, each time with a next chunk. Loop over the file to get lines, pass each line to .digest(), and when the file is done get the digest.Try this. Hope it helps. The variable var has to be utf-8 encoded. If you type in a string i.e. "Donald Duck", the var variable will be b'Donald Duck'. You can then hash the string with hexdigest()
#!/usr/bin/python3
import hashlib
var = input('Input string: ').encode('utf-8')
hashed_var = hashlib.md5(var).hexdigest()
print(hashed_var)
I had the same issue as the OP. I couldn't get either of the previous answers to work for me for some reason, but a combination of both helped come to this solution.
I was originally hashing a string like this;
str = hashlib.sha256(b'hash this text')
text_hashed = str.hexdigest()
print(text_hashed)
Result;d3dba6081b7f171ec5fa4687182b269c0b46e77a78611ad268182d8a8c245b40
My solution to hash a variable;
text = 'hash this text'
str = hashlib.sha256(text.encode('utf-8'))
text_hashed = str.hexdigest()
print(text_hashed)
Result; d3dba6081b7f171ec5fa4687182b269c0b46e77a78611ad268182d8a8c245b40
m.update(var)?hash.update()needs bytes and that therefor your problem was that you got an exception when you tried to use astrvalue instead. Next time include that exception in your question.