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add tweak_add, sign, and verify functions to key.py

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jeffthibault
2022-10-20 09:27:46 -04:00
parent 13ed62b989
commit a96a724e93
1 changed files with 15 additions and 0 deletions
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15
nostr/key.py
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@@ -23,6 +23,12 @@ def get_key_pair() -> tuple:
public_key = private_key.pubkey.serialize().hex()
return (private_key.serialize(), public_key[2:])
def tweak_add_private_key(private_key: str, scalar: bytes) -> str:
sk = PrivateKey(bytes.fromhex(private_key))
tweaked_secret = sk.tweak_add(scalar)
new_sk = PrivateKey(tweaked_secret)
return new_sk.serialize()
def compute_shared_secret(sender_private_key: str, receiver_public_key: str) -> str:
public_key = PublicKey(bytes.fromhex("02" + receiver_public_key), True)
return public_key.ecdh(bytes.fromhex(sender_private_key), copy_x).hex()
@@ -55,6 +61,15 @@ def decrypt_message(encoded_message: str, shared_secret: str) -> str:
return unpadded_data.decode()
def sign_message(hash: str, private_key: str) -> str:
sk = PrivateKey(bytes.fromhex(private_key))
sig = sk.schnorr_sign(bytes.fromhex(hash), None, raw=True)
return sig.hex()
def verify_message(hash: str, sig: str, public_key: str) -> bool:
pk = PublicKey(bytes.fromhex("02" + public_key), True)
return pk.schnorr_verify(bytes.fromhex(hash), bytes.fromhex(sig), None, True)
ffi = FFI()
@ffi.callback("int (unsigned char *, const unsigned char *, const unsigned char *, void *)")
def copy_x(output, x32, y32, data):