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proto.secp256k1.keygen: factor out pubkey_format()

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The MMGen Project 2023-12-12 10:19:52 +00:00
commit 21a6e95a10
Signed by: mmgen
GPG key ID: 3F8B1861E32B7DA2
1 changed files with 6 additions and 6 deletions
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12
mmgen/proto/secp256k1/keygen.py
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@ -15,6 +15,11 @@ proto.secp256k1.keygen: secp256k1 public key generation backends for the MMGen s
from ...key import PubKey
from ...keygen import keygen_base
def pubkey_format(vk_bytes,compressed):
# if compressed, discard Y coord, replace with appropriate version byte
# even y: <0, odd y: >0 -- https://bitcointalk.org/index.php?topic=129652.0
return (b'\x02',b'\x03')[vk_bytes[-1] & 1] + vk_bytes[:32] if compressed else b'\x04' + vk_bytes
class backend:
class libsecp256k1(keygen_base):
@ -70,12 +75,7 @@ class backend:
def privnum2pubkey(numpriv,compressed=False):
pk = self.ecdsa.SigningKey.from_secret_exponent(numpriv,curve=self.ecdsa.SECP256k1)
# vk_bytes = x (32 bytes) + y (32 bytes) (unsigned big-endian)
vk_bytes = pk.verifying_key.to_string()
if compressed: # discard Y coord, replace with appropriate version byte
# even y: <0, odd y: >0 -- https://bitcointalk.org/index.php?topic=129652.0
return (b'\x03' if vk_bytes[-1] & 1 else b'\x02') + vk_bytes[:32]
else:
return b'\x04' + vk_bytes
return pubkey_format(pk.verifying_key.to_string(),compressed)
return PubKey(
s = privnum2pubkey( int.from_bytes(privkey,'big'), compressed=privkey.compressed ),