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