Convert base64-encoded string into hex int

I have a base64-encoded nonce as a 24-character string:

nonce = "azRzAi5rm1ry/l0drnz1vw==" 

And I want a 16-byte int:

0x6b3473022e6b9b5af2fe5d1dae7cf5bf 

My best attempt:

from base64 import b64decode b64decode(nonce) >> b'k4s\x02.k\x9bZ\xf2\xfe]\x1d\xae|\xf5\xbf' 

How can I get an integer from the base64 string?

2 Answers

To get an integer from the string, you can do:

Code:

# Python 3 decoded = int.from_bytes(b64decode(nonce), 'big') # Python 2 decoded = int(b64decode(nonce).encode('hex'), 16) 

Test Code:

nonce = "azRzAi5rm1ry/l0drnz1vw==" nonce_hex = 0x6b3473022e6b9b5af2fe5d1dae7cf5bf from base64 import b64decode decoded = int.from_bytes(b64decode(nonce), 'big') # PY 2 # decoded = int(b64decode(nonce).encode('hex'), 16) assert decoded == nonce_hex print(hex(decoded)) 

Results:

0x6b3473022e6b9b5af2fe5d1dae7cf5bf 

You can convert like this:

>>> import codecs >>> decoded = base64.b64decode(nonce) >>> b_string = codecs.encode(decoded, 'hex') >>> b_string b'6b3473022e6b9b5af2fe5d1dae7cf5bf'