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17 lines
522 B
Python
17 lines
522 B
Python
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import hashlib
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from .secp256k1 import GE, Scalar
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def ecdh_compressed_in_raw_out(seckey: bytes, pubkey: bytes) -> GE:
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"""TODO"""
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shared_secret = Scalar.from_bytes_checked(seckey) * GE.from_bytes_compressed(pubkey)
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assert not shared_secret.infinity # prime-order group
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return shared_secret
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def ecdh_libsecp256k1(seckey: bytes, pubkey: bytes) -> bytes:
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"""TODO"""
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shared_secret = ecdh_compressed_in_raw_out(seckey, pubkey)
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return hashlib.sha256(shared_secret.to_bytes_compressed()).digest()
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