> On Feb 8, 2016, at 10:52 PM, Daniel Monteiro Basso <[email protected]>
> wrote:
>
> On Tue, 2016-02-09 at 03:11 +0000, Pitucha, Stanislaw Izaak wrote:
>> You probably need to use hazmat, but it has a pretty nice API.
>> There's a short example in the docs:
>> https://cryptography.io/en/latest/hazmat/primitives/asymmetric/rsa/#s
>> igning
>
> And to build the key he should do something like this:
>
> from cryptography.hazmat.primitives.asymmetric import rsa
> from cryptography.hazmat.backends import default_backend
>
> def generate_key(modulus_b64, exp_b64):
> [...]
> pub_num = rsa.RSAPublicNumbers(exp, mod)
> return pub_num.public_key(default_backend())
Thanks, I think the fog is clearing...
from cryptography.exceptions import InvalidSignature
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.asymmetric import rsa, padding
def generate_key(exp_b64, modulus_b64):
exp = int(b64decode(exp_b64).encode('hex'), 16)
mod = int(b64decode(modulus_b64).encode('hex'), 16)
pub_num = rsa.RSAPublicNumbers(exp, mod)
return pub_num.public_key(default_backend())
def verify(expected_proof, signed_proof, public_key):
verifier = public_key.verifier(
signed_proof, padding.PKCS1v15(), hashes.SHA256())
verifier.update(expected_proof)
try:
verifier.verify()
except InvalidSignature:
return False
return True
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