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Support importing sm2 curve #723

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Support importing sm2 curve #723

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d9b27bf
Support importing sm2 curve
lonepig Mar 31, 2023
33bf49c
test: test vectors for ecc sm2
lonepig May 9, 2023
9b42483
test: import & export for sm2
lonepig May 9, 2023
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51 changes: 51 additions & 0 deletions lib/Crypto/PublicKey/ECC.py
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Original file line number Diff line number Diff line change
Expand Up @@ -456,6 +456,52 @@ def init_ed448():
del init_ed448


sm2_names = ["sm2", "sm2p256v1"]


def init_sm2p256v1():
p = 0xFFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFF
b = 0x28E9FA9E9D9F5E344D5A9E4BCF6509A7F39789F515AB8F92DDBCBD414D940E93
order = 0xFFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFF7203DF6B21C6052B53BBF40939D54123
Gx = 0x32c4ae2c1f1981195f9904466a39c9948fe30bbff2660be1715a4589334c74c7
Gy = 0xbc3736a2f4f6779c59bdcee36b692153d0a9877cc62a474002df32e52139f0a0

p256_modulus = long_to_bytes(p, 32)
p256_b = long_to_bytes(b, 32)
p256_order = long_to_bytes(order, 32)

ec_p256_context = VoidPointer()
result = _ec_lib.ec_ws_new_context(ec_p256_context.address_of(),
c_uint8_ptr(p256_modulus),
c_uint8_ptr(p256_b),
c_uint8_ptr(p256_order),
c_size_t(len(p256_modulus)),
c_ulonglong(getrandbits(64))
)
if result:
raise ImportError("Error %d initializing sm2p256v1 context" % result)

context = SmartPointer(ec_p256_context.get(), _ec_lib.ec_free_context)
p256 = _Curve(Integer(p),
Integer(b),
Integer(order),
Integer(Gx),
Integer(Gy),
None,
256,
"1.2.156.10197.1.301", # China GM Standards Committee
context,
"sm2p256v1",
None,
"sm2")
global sm2_names
_curves.update(dict.fromkeys(sm2_names, p256))


init_sm2p256v1()
del init_sm2p256v1


class UnsupportedEccFeature(ValueError):
pass

Expand Down Expand Up @@ -701,6 +747,11 @@ def __rmul__(self, left_hand):
_curves.update(dict.fromkeys(ed448_names, ed448))
del ed448_G, ed448, ed448_names

sm2p256_G = EccPoint(_curves['sm2'].Gx, _curves['sm2'].Gy, "sm2")
sm2p256 = _curves['sm2']._replace(G=sm2p256_G)
_curves.update(dict.fromkeys(sm2_names, sm2p256))
del sm2p256_G, sm2p256, sm2_names


class EccKey(object):
r"""Class defining an ECC key.
Expand Down
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