64 lines
2.2 KiB
Python
64 lines
2.2 KiB
Python
# SPDX-License-Identifier: MIT
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#
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# Copyright (c) 2017 PySSB contributors (see AUTHORS for more details)
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in all
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# copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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"""Utility functions"""
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from base64 import b64decode, b64encode
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import os
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from typing import Optional, TypedDict
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from nacl.signing import SigningKey, VerifyKey
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import yaml
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class SSBSecret(TypedDict):
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"""Dictionary to hold an SSB identity"""
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keypair: SigningKey
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id: str
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class ConfigException(Exception):
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"""Exception to raise if there is a problem with the configuration data"""
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def tag(key: VerifyKey) -> bytes:
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"""Create tag from public key"""
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return b"@" + b64encode(bytes(key)) + b".ed25519"
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def load_ssb_secret(filename: Optional[str] = None) -> SSBSecret:
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"""Load SSB keys from ``filename`` or, if unset, from ``~/.ssb/secret``"""
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filename = filename or os.path.expanduser("~/.ssb/secret")
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with open(filename, encoding="utf-8") as f:
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config = yaml.load(f, Loader=yaml.SafeLoader)
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if config["curve"] != "ed25519":
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raise ConfigException("Algorithm not known: " + config["curve"])
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server_prv_key = b64decode(config["private"][:-8])
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return {"keypair": SigningKey(server_prv_key[:32]), "id": config["id"]}
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