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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",
"SECP112r1",
"SECP112r2",
"SECP128r1",
"SECP160r1",
"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 * orderlen(curve.p())
self.signature_length = 2 * self.baselen
self.oid = oid
self.encoded_oid = der.encode_oid(*oid)
def __repr__(self):
return self.name
# the SEC curves
SECP112r1 = Curve(
"SECP112r1",
ecdsa.curve_112r1,
ecdsa.generator_112r1,
(1, 3, 132, 0, 6),
"secp112r1",
)
SECP112r2 = Curve(
"SECP112r2",
ecdsa.curve_112r2,
ecdsa.generator_112r2,
(1, 3, 132, 0, 7),
"secp112r2",
)
SECP128r1 = Curve(
"SECP128r1",
ecdsa.curve_128r1,
ecdsa.generator_128r1,
(1, 3, 132, 0, 28),
"secp128r1",
)
SECP160r1 = Curve(
"SECP160r1",
ecdsa.curve_160r1,
ecdsa.generator_160r1,
(1, 3, 132, 0, 8),
"secp160r1",
)
# 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",
)
# no order in particular, but keep previously added curves first
curves = [
NIST192p,
NIST224p,
NIST256p,
NIST384p,
NIST521p,
SECP256k1,
BRAINPOOLP160r1,
BRAINPOOLP192r1,
BRAINPOOLP224r1,
BRAINPOOLP256r1,
BRAINPOOLP320r1,
BRAINPOOLP384r1,
BRAINPOOLP512r1,
SECP112r1,
SECP112r2,
SECP128r1,
SECP160r1,
]
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])
)
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