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# This file is dual licensed under the terms of the Apache License, Version
# 2.0, and the BSD License. See the LICENSE file in the root of this repository
# for complete details.
from __future__ import absolute_import, division, print_function
import binascii
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.kdf.hkdf import HKDF
IKM = binascii.unhexlify(b"0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b")
L = 1200
OKM = HKDF(
algorithm=hashes.SHA256(), length=L, salt=None, info=None,
backend=default_backend()
).derive(IKM)
def _build_vectors():
output = [
"COUNT = 0",
"Hash = SHA-256",
"IKM = " + binascii.hexlify(IKM).decode("ascii"),
"salt = ", "info = ",
"L = {}".format(L),
"OKM = " + binascii.hexlify(OKM).decode("ascii"),
]
return "\n".join(output)
def _write_file(data, filename):
with open(filename, 'w') as f:
f.write(data)
if __name__ == '__main__':
_write_file(_build_vectors(), 'hkdf.txt')
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