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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 = [] output.append("COUNT = 0") output.append("Hash = SHA-256") output.append("IKM = " + binascii.hexlify(IKM).decode("ascii")) output.append("salt = ") output.append("info = ") output.append("L = {}".format(L)) output.append("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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