48 lines
1.6 KiB
Python
48 lines
1.6 KiB
Python
from base64 import b64decode, b64encode
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from hashlib import sha3_224
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from functools import cache
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from cryptography.hazmat.primitives.asymmetric.ed25519 import Ed25519PrivateKey
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from cryptography.hazmat.primitives.serialization import Encoding, PrivateFormat, PublicFormat, NoEncryption
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@cache
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def generate_ed25519_key_pair(secret):
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privkey_bytes = Ed25519PrivateKey.from_private_bytes(secret)
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# PRIVATE KEY
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nondeterministic_privatekey = privkey_bytes.private_bytes(
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encoding=Encoding.PEM,
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format=PrivateFormat.OpenSSH,
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encryption_algorithm=NoEncryption()
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).decode()
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# get relevant lines from string
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nondeterministic_bytes = b64decode(''.join(nondeterministic_privatekey.split('\n')[1:-2]))
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# sanity check
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if nondeterministic_bytes[98:102] != nondeterministic_bytes[102:106]:
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raise Exception("checksums should be the same: whats going on here?")
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# replace random bytes with deterministic values
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random_bytes = sha3_224(secret).digest()[0:4]
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deterministic_bytes = nondeterministic_bytes[:98] + random_bytes + random_bytes + nondeterministic_bytes[106:]
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# reassemble file
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deterministic_privatekey = '\n'.join([
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'-----BEGIN OPENSSH PRIVATE KEY-----',
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b64encode(deterministic_bytes).decode(),
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'-----END OPENSSH PRIVATE KEY-----',
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])
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# PUBLIC KEY
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public_key = privkey_bytes.public_key().public_bytes(
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encoding=Encoding.OpenSSH,
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format=PublicFormat.OpenSSH,
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).decode()
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# RETURN
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return (deterministic_privatekey, public_key)
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