Source code
Revision control
Copy as Markdown
Other Tools
from __future__ import division
from . import der, ecdsa
from .util import orderlen
# orderlen was defined in this module previously, so keep it in __all__,
# will need to mark it as deprecated later
__all__ = ["UnknownCurveError", "orderlen", "Curve", "NIST192p",
"NIST224p", "NIST256p", "NIST384p", "NIST521p", "curves",
"find_curve", "SECP256k1", "BRAINPOOLP160r1", "BRAINPOOLP192r1",
"BRAINPOOLP224r1", "BRAINPOOLP256r1", "BRAINPOOLP320r1",
"BRAINPOOLP384r1", "BRAINPOOLP512r1"]
class UnknownCurveError(Exception):
pass
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)
def __repr__(self):
return self.name
# the NIST curves
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")
BRAINPOOLP160r1 = Curve("BRAINPOOLP160r1",
ecdsa.curve_brainpoolp160r1,
ecdsa.generator_brainpoolp160r1,
(1, 3, 36, 3, 3, 2, 8, 1, 1, 1),
"brainpoolP160r1")
BRAINPOOLP192r1 = Curve("BRAINPOOLP192r1",
ecdsa.curve_brainpoolp192r1,
ecdsa.generator_brainpoolp192r1,
(1, 3, 36, 3, 3, 2, 8, 1, 1, 3),
"brainpoolP192r1")
BRAINPOOLP224r1 = Curve("BRAINPOOLP224r1",
ecdsa.curve_brainpoolp224r1,
ecdsa.generator_brainpoolp224r1,
(1, 3, 36, 3, 3, 2, 8, 1, 1, 5),
"brainpoolP224r1")
BRAINPOOLP256r1 = Curve("BRAINPOOLP256r1",
ecdsa.curve_brainpoolp256r1,
ecdsa.generator_brainpoolp256r1,
(1, 3, 36, 3, 3, 2, 8, 1, 1, 7),
"brainpoolP256r1")
BRAINPOOLP320r1 = Curve("BRAINPOOLP320r1",
ecdsa.curve_brainpoolp320r1,
ecdsa.generator_brainpoolp320r1,
(1, 3, 36, 3, 3, 2, 8, 1, 1, 9),
"brainpoolP320r1")
BRAINPOOLP384r1 = Curve("BRAINPOOLP384r1",
ecdsa.curve_brainpoolp384r1,
ecdsa.generator_brainpoolp384r1,
(1, 3, 36, 3, 3, 2, 8, 1, 1, 11),
"brainpoolP384r1")
BRAINPOOLP512r1 = Curve("BRAINPOOLP512r1",
ecdsa.curve_brainpoolp512r1,
ecdsa.generator_brainpoolp512r1,
(1, 3, 36, 3, 3, 2, 8, 1, 1, 13),
"brainpoolP512r1")
curves = [NIST192p, NIST224p, NIST256p, NIST384p, NIST521p, SECP256k1,
BRAINPOOLP160r1, BRAINPOOLP192r1, BRAINPOOLP224r1, BRAINPOOLP256r1,
BRAINPOOLP320r1, BRAINPOOLP384r1, BRAINPOOLP512r1]
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]))