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import hashlib
import os
from binascii import hexlify
from collections import defaultdict
from ecdsa import SECP256k1, SigningKey
from ecdsa.util import sigdecode_der, sigencode_der
from cryptography_vectors import open_vector_file
from tests.utils import load_fips_ecdsa_signing_vectors, load_vectors_from_file
HASHLIB_HASH_TYPES = {
"SHA-1": hashlib.sha1,
"SHA-224": hashlib.sha224,
"SHA-256": hashlib.sha256,
"SHA-384": hashlib.sha384,
"SHA-512": hashlib.sha512,
}
class TruncatedHash:
def __init__(self, hasher):
self.hasher = hasher
def __call__(self, data):
self.hasher.update(data)
return self
def digest(self):
return self.hasher.digest()[: 256 // 8]
def build_vectors(fips_vectors):
vectors = defaultdict(list)
for vector in fips_vectors:
vectors[vector["digest_algorithm"]].append(vector["message"])
for digest_algorithm, messages in vectors.items():
if digest_algorithm not in HASHLIB_HASH_TYPES:
continue
yield ""
yield f"[K-256,{digest_algorithm}]"
yield ""
for message in messages:
# Make a hash context
hash_func = TruncatedHash(HASHLIB_HASH_TYPES[digest_algorithm]())
# Sign the message using warner/ecdsa
secret_key = SigningKey.generate(curve=SECP256k1)
public_key = secret_key.get_verifying_key()
signature = secret_key.sign(
message, hashfunc=hash_func, sigencode=sigencode_der
)
r, s = sigdecode_der(signature, None)
yield f"Msg = {hexlify(message)}"
yield f"d = {secret_key.privkey.secret_multiplier:x}"
yield f"Qx = {public_key.pubkey.point.x():x}"
yield f"Qy = {public_key.pubkey.point.y():x}"
yield f"R = {r:x}"
yield f"S = {s:x}"
yield ""
def write_file(lines, dest):
for line in lines:
print(line)
print(line, file=dest)
source_path = os.path.join("asymmetric", "ECDSA", "FIPS_186-3", "SigGen.txt")
dest_path = os.path.join("asymmetric", "ECDSA", "SECP256K1", "SigGen.txt")
fips_vectors = load_vectors_from_file(
source_path, load_fips_ecdsa_signing_vectors
)
with open_vector_file(dest_path, "w") as dest_file:
write_file(build_vectors(fips_vectors), dest_file)
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