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67 lines
1.9 KiB
Python
67 lines
1.9 KiB
Python
import os.path
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from getopt import getopt
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from sys import argv, exit
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from cryptography.hazmat.backends import default_backend
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from cryptography.hazmat.primitives import serialization
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from cryptography.hazmat.primitives.asymmetric import ec
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"""
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Simple way too to generate an ECDSA key pair using the secp256k1 curve and store it on disk.
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Default output dir = .
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Default key naming = teos_sk.der and teos_pk.der
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The output dir and naming can be changed using the -n and -d command line options, respectively.
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DISCLAIMER: Use this for testing only, using keys generated from this file in production is highly unadvised.
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"""
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def save_sk(sk, filename):
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der = sk.private_bytes(
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encoding=serialization.Encoding.DER,
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format=serialization.PrivateFormat.PKCS8,
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encryption_algorithm=serialization.NoEncryption(),
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)
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with open(filename, "wb") as der_out:
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der_out.write(der)
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def save_pk(pk, filename):
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der = pk.public_bytes(encoding=serialization.Encoding.X962, format=serialization.PublicFormat.CompressedPoint)
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with open(filename, "wb") as der_out:
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der_out.write(der)
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if __name__ == "__main__":
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name = "teos"
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output_dir = "."
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opts, _ = getopt(argv[1:], "n:d:", ["name", "dir"])
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for opt, arg in opts:
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if opt in ["-n", "--name"]:
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name = arg
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if opt in ["-d", "--dir"]:
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output_dir = arg
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if output_dir.endswith("/"):
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output_dir = output_dir[:-1]
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SK_FILE_NAME = "{}/{}_sk.der".format(output_dir, name)
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PK_FILE_NAME = "{}/{}_pk.der".format(output_dir, name)
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if os.path.exists(SK_FILE_NAME):
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print('A key with name "{}" already exists. Aborting.'.format(SK_FILE_NAME))
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exit(1)
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sk = ec.generate_private_key(ec.SECP256K1, default_backend())
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pk = sk.public_key()
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save_sk(sk, SK_FILE_NAME)
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save_pk(pk, PK_FILE_NAME)
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print('Saved private key "{}" and public key "{}".'.format(SK_FILE_NAME, PK_FILE_NAME))
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