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addr.py: class KeyGeneratorPython cleanups

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- move initialization of curve to __init__()
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The MMGen Project 2018-09-30 15:27:01 +00:00
commit 581ae5c8b2
Signed by: mmgen
GPG key ID: 3F8B1861E32B7DA2
1 changed files with 21 additions and 21 deletions
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mmgen/addr.py
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@ -219,34 +219,34 @@ class KeyGenerator(MMGenObject):
import ecdsa
class KeyGeneratorPython(KeyGenerator):
desc = 'mmgen-python-ecdsa'
# From electrum:
# secp256k1, http://www.oid-info.com/get/1.3.132.0.10
_p = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2FL
_r = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141L
_b = 0x0000000000000000000000000000000000000000000000000000000000000007L
_a = 0x0000000000000000000000000000000000000000000000000000000000000000L
_Gx = 0x79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798L
_Gy = 0x483ada7726a3c4655da4fbfc0e1108a8fd17b448a68554199c47d08ffb10d4b8L
_curve_secp256k1 = ecdsa.ellipticcurve.CurveFp(_p,_a,_b)
_generator_secp256k1 = ecdsa.ellipticcurve.Point(_curve_secp256k1,_Gx,_Gy,_r)
_oid_secp256k1 = (1,3,132,0,10)
_secp256k1 = ecdsa.curves.Curve('secp256k1',_curve_secp256k1,_generator_secp256k1,_oid_secp256k1)
def __init__(self,*args,**kwargs):
# secp256k1: http://www.oid-info.com/get/1.3.132.0.10
p = 0xfffffffffffffffffffffffffffffffffffffffffffffffffffffffefffffc2f
r = 0xfffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141
b = 0x0000000000000000000000000000000000000000000000000000000000000007
a = 0x0000000000000000000000000000000000000000000000000000000000000000
Gx = 0x79be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798
Gy = 0x483ada7726a3c4655da4fbfc0e1108a8fd17b448a68554199c47d08ffb10d4b8
curve_fp = ecdsa.ellipticcurve.CurveFp(p,a,b)
G = ecdsa.ellipticcurve.Point(curve_fp,Gx,Gy,r)
oid = (1,3,132,0,10)
self.secp256k1 = ecdsa.curves.Curve('secp256k1',curve_fp,G,oid)
# devdoc/guide_wallets.md:
# Uncompressed public keys start with 0x04; compressed public keys begin with
# 0x03 or 0x02 depending on whether they're greater or less than the midpoint
# of the curve.
# Uncompressed public keys start with 0x04; compressed public keys begin with 0x03 or
# 0x02 depending on whether they're greater or less than the midpoint of the curve.
def privnum2pubhex(self,numpriv,compressed=False):
pko = ecdsa.SigningKey.from_secret_exponent(numpriv,self._secp256k1)
# pubkey = 32-byte X coord + 32-byte Y coord (unsigned big-endian)
pko = ecdsa.SigningKey.from_secret_exponent(numpriv,self.secp256k1)
# pubkey = x (32 bytes) + y (32 bytes) (unsigned big-endian)
pubkey = hexlify(pko.get_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
p = ('03','02')[pubkey[-1] in '02468ace']
return p+pubkey[:64]
# even y: <0, odd y: >0 -- https://bitcointalk.org/index.php?topic=129652.0
return ('03','02')[pubkey[-1] in '02468ace'] + pubkey[:64]
else:
return '04'+pubkey
return '04' + pubkey
def to_pubhex(self,privhex):
assert type(privhex) == PrivKey