I had a script in Python2 that was working great.
def _generate_signature(data):
return hmac.new('key', data, hashlib.sha256).hexdigest()
Where data was the output of json.dumps
.
Now, if I try to run the same kind of code in Python 3, I get the following:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib/python3.4/hmac.py", line 144, in new
return HMAC(key, msg, digestmod)
File "/usr/lib/python3.4/hmac.py", line 42, in __init__
raise TypeError("key: expected bytes or bytearray, but got %r" %type(key).__name__)
TypeError: key: expected bytes or bytearray, but got 'str'
If I try something like transforming the key to bytes like so:
bytes('key')
I get
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: string argument without an encoding
I'm still struggling to understand the encodings in Python 3.
You can use bytes literal: b'key'
def _generate_signature(data):
return hmac.new(b'key', data, hashlib.sha256).hexdigest()
In addition to that, make sure data
is also bytes. For example, if it is read from file, you need to use binary
mode (rb
) when opening the file.