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from __future__ import absolute_import, print_function
import os
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.asymmetric import ec
from cryptography.hazmat.primitives.asymmetric.utils import (
encode_dss_signature
)
from tests.utils import (
load_fips_ecdsa_signing_vectors, load_vectors_from_file
)
CRYPTOGRAPHY_HASH_TYPES = {
"SHA-1": hashes.SHA1,
"SHA-224": hashes.SHA224,
"SHA-256": hashes.SHA256,
"SHA-384": hashes.SHA384,
"SHA-512": hashes.SHA512,
}
def verify_one_vector(vector):
digest_algorithm = vector['digest_algorithm']
message = vector['message']
x = vector['x']
y = vector['y']
signature = encode_dss_signature(vector['r'], vector['s'])
numbers = ec.EllipticCurvePublicNumbers(
x, y,
ec.SECP256K1()
)
key = numbers.public_key(default_backend())
verifier = key.verifier(
signature,
ec.ECDSA(CRYPTOGRAPHY_HASH_TYPES[digest_algorithm]())
)
verifier.update(message)
return verifier.verify()
def verify_vectors(vectors):
for vector in vectors:
assert verify_one_vector(vector)
vector_path = os.path.join("asymmetric", "ECDSA", "SECP256K1", "SigGen.txt")
secp256k1_vectors = load_vectors_from_file(
vector_path,
load_fips_ecdsa_signing_vectors
)
verify_vectors(secp256k1_vectors)