98 lines
3.0 KiB
Python
98 lines
3.0 KiB
Python
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# Copyright 2011 Sybren A. Stüvel <sybren@stuvel.eu>
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# https://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Utility functions."""
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import sys
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from optparse import OptionParser
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import rsa.key
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def private_to_public() -> None:
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"""Reads a private key and outputs the corresponding public key."""
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# Parse the CLI options
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parser = OptionParser(
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usage="usage: %prog [options]",
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description="Reads a private key and outputs the "
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"corresponding public key. Both private and public keys use "
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"the format described in PKCS#1 v1.5",
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)
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parser.add_option(
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"-i",
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"--input",
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dest="infilename",
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type="string",
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help="Input filename. Reads from stdin if not specified",
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)
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parser.add_option(
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"-o",
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"--output",
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dest="outfilename",
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type="string",
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help="Output filename. Writes to stdout of not specified",
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)
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parser.add_option(
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"--inform",
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dest="inform",
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help="key format of input - default PEM",
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choices=("PEM", "DER"),
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default="PEM",
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)
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parser.add_option(
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"--outform",
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dest="outform",
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help="key format of output - default PEM",
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choices=("PEM", "DER"),
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default="PEM",
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)
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(cli, cli_args) = parser.parse_args(sys.argv)
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# Read the input data
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if cli.infilename:
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print(
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"Reading private key from %s in %s format" % (cli.infilename, cli.inform),
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file=sys.stderr,
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)
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with open(cli.infilename, "rb") as infile:
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in_data = infile.read()
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else:
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print("Reading private key from stdin in %s format" % cli.inform, file=sys.stderr)
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in_data = sys.stdin.read().encode("ascii")
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assert type(in_data) == bytes, type(in_data)
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# Take the public fields and create a public key
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priv_key = rsa.key.PrivateKey.load_pkcs1(in_data, cli.inform)
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pub_key = rsa.key.PublicKey(priv_key.n, priv_key.e)
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# Save to the output file
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out_data = pub_key.save_pkcs1(cli.outform)
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if cli.outfilename:
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print(
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"Writing public key to %s in %s format" % (cli.outfilename, cli.outform),
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file=sys.stderr,
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)
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with open(cli.outfilename, "wb") as outfile:
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outfile.write(out_data)
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else:
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print("Writing public key to stdout in %s format" % cli.outform, file=sys.stderr)
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sys.stdout.write(out_data.decode("ascii"))
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