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from __future__ import division
from . import der, ecdsa
class UnknownCurveError(Exception):
pass
def orderlen(order):
return (1+len("%x"%order))//2 # bytes
# the NIST curves
class Curve:
def __init__(self, name, curve, generator, oid, openssl_name=None):
self.name = name
self.openssl_name = openssl_name # maybe None
self.curve = curve
self.generator = generator
self.order = generator.order()
self.baselen = orderlen(self.order)
self.verifying_key_length = 2*self.baselen
self.signature_length = 2*self.baselen
self.oid = oid
self.encoded_oid = der.encode_oid(*oid)
NIST192p = Curve("NIST192p", ecdsa.curve_192, ecdsa.generator_192,
(1, 2, 840, 10045, 3, 1, 1), "prime192v1")
NIST224p = Curve("NIST224p", ecdsa.curve_224, ecdsa.generator_224,
(1, 3, 132, 0, 33), "secp224r1")
NIST256p = Curve("NIST256p", ecdsa.curve_256, ecdsa.generator_256,
(1, 2, 840, 10045, 3, 1, 7), "prime256v1")
NIST384p = Curve("NIST384p", ecdsa.curve_384, ecdsa.generator_384,
(1, 3, 132, 0, 34), "secp384r1")
NIST521p = Curve("NIST521p", ecdsa.curve_521, ecdsa.generator_521,
(1, 3, 132, 0, 35), "secp521r1")
SECP256k1 = Curve("SECP256k1", ecdsa.curve_secp256k1, ecdsa.generator_secp256k1,
(1, 3, 132, 0, 10), "secp256k1")
curves = [NIST192p, NIST224p, NIST256p, NIST384p, NIST521p, SECP256k1]
def find_curve(oid_curve):
for c in curves:
if c.oid == oid_curve:
return c
raise UnknownCurveError("I don't know about the curve with oid %s."
"I only know about these: %s" %
(oid_curve, [c.name for c in curves]))