def _decode_pub_compressed(bytes):
if bytes[0] not in ['\x02', '\x03']:
raise Error('first byte not x02 or \x03')
x = decode_bigint(bytes[1:])
alpha = (x * x * x + curve_secp256k1.a() * x +
curve_secp256k1.b()) % curve_secp256k1.p()
beta = msqr.modular_sqrt(alpha, curve_secp256k1.p())
y = beta if (beta - ord(bytes[0])) % 2 == 0 else curve_secp256k1.p() - beta
return ecdsa.ellipticcurve.Point(curve_secp256k1, x, y, secp256k1.order)
def encode_varint(i):
if i < 0xfd:
return struct.pack('<B', i)
elif i <= 0xffff:
return struct.pack('<BH', 0xfd, i)
elif i <= 0xffffffff:
return struct.pack('<BI', 0xfe, i)
elif i <= 0xffffffffffffffff:
return struct.pack('<BQ', 0xff, i)
else:
raise Error('int too big for varint: %r' % (i, ))
def decode_privkey(priv):
raw = base58_decode_checksum(priv)
version = raw[0]
if version != '\x80':
raise Error('Version (%r) != \x80' % (version, ))
return decode_bigint(raw[1:])
def _decode_pub(bytes):
if bytes[0] != '\x04':
raise Error('byte 0 should be 0x04')
x = decode_bigint(bytes[1:BIGINT_BYTES + 1])
y = decode_bigint(bytes[BIGINT_BYTES + 1:])
return ecdsa.ellipticcurve.Point(curve_secp256k1, x, y, secp256k1.order)
def __init__(self):
raise Error('Unimplemented')