CODEWITHSUNDEEP
pythonecdsa
jsstuball
jsstuball

Reputation: 4951

Python ECDSA, sign with private key with curve secp224k1

I'm really having a hard time getting to get to grips with this 3rd party Python module. I'm trying to sign a 28-byte SHA-224 digest using a 28-byte SHA-224 digest private key under secp224k1.

My attempt:

import ecdsa

private_key = int("b89ea7fcd22cc059c2673dc24ff40b978307464686560d0ad7561b83", 16).to_bytes(28, byteorder='big')
digest_msg = int("d8af940293347bc348df1896b0d93bf3952399702cef4fbf199d1cf4", 16).to_bytes(28, byteorder='big')

sk = SigningKey.generate(private_key, curve=ecdsa.secp224k1) 
sig = sk.sign_digest(digest_msg)

>> AttributeError: module 'ecdsa' has no attribute 'secp224k1'

Hopelessly, I can't even google my way out of this error.

Upvotes: 1

Views: 2363

Answers (1)

Kyrylo
Kyrylo

Reputation: 651

I suggest using the fastecdsa for doing this type of task.

As far as I know, ecdsa does not support secp224k1 curve.

fastecdsa does not support importing the key from a string, but you can export it to a pem format and import it using keys.import_key(). Check it here.

from fastecdsa import keys, curve, ecdsa

#generating the private key over secp224k1 curve
private_key = keys.gen_private_key(curve=curve.secp224k1)

#get the public key from the corresponding private key
public_key = keys.get_public_key(private_key, curve=curve.secp224k1)

msg = "Sign this message with secp224k1"

r, s = ecdsa.sign(msg, private_key, curve.secp224k1)

print(ecdsa.verify((r, s), msg, public_key, curve.secp224k1))

Output:

True

Upvotes: 1

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