CODEWITHSUNDEEP
pythonhmachmacsha1
Fabrizio Demaria
Fabrizio Demaria

Reputation: 473

Python hmac (sha1) calculation

I am trying to calculate the HMAC-SHA1 value in Python, but results don't match with the standard tool I am using as reference (openSSL):

Python

k = "ffffffffffffffffffffffffffffffff"
m = "ffffffffffffffffffffffffffffffff"
key = k.decode("hex")
msg = m.decode("hex")
print xlong(hmac.new(key, msg=msg, digestmod=hashlib.sha1).digest())

Result: 801271609151602865551107406598369208989784139177

OpenSSL

echo -n ‘ffffffffffffffffffffffffffffffff’ | xxd -r -p | openssl dgst -sha1 -mac HMAC -macopt hexkey:ffffffffffffffffffffffffffffffff

Result: 8c5a42f91479bfbaed8dd538db8c4a76b44ee5a9

Upvotes: 2

Views: 2376

Answers (1)

mhawke
mhawke

Reputation: 87054

Try using binascii.hexlify() on the HMAC:

>>> from binascii import hexlify
>>> print hexlify(hmac.new(key, msg=msg, digestmod=hashlib.sha1).digest())
8c5a42f91479bfbaed8dd538db8c4a76b44ee5a9

Or you may just use str.encode('hex'):

>>> print hmac.new(key, msg=msg, digestmod=hashlib.sha1).digest().encode('hex')
8c5a42f91479bfbaed8dd538db8c4a76b44ee5a9

Upvotes: 4

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