From 54976ab896bb129661061d154e12c4461cb17550 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hanno=20B=C3=B6ck?= <990588+hannob@users.noreply.github.com>
Date: Sun, 26 Oct 2025 14:10:22 +0100
Subject: [PATCH] Add SM2 curve support

---
 lightecc/curves/weierstrass.py | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/lightecc/curves/weierstrass.py b/lightecc/curves/weierstrass.py
index 064d800..67f6e98 100644
--- a/lightecc/curves/weierstrass.py
+++ b/lightecc/curves/weierstrass.py
@@ -928,6 +928,17 @@ class EccFrog512CK2(WeierstrassInterface):
     n = 9149012705592502490164965176888130701548053918699793689672344807772801105830557269123255850915745063541133157503707284048429261692283957712127567713136519
 
 
+class SM2(WeierstrassInterface):
+    a = 0xFFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFC
+    b = 0x28E9FA9E9D9F5E344D5A9E4BCF6509A7F39789F515AB8F92DDBCBD414D940E93
+    p = 0xFFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFF
+    G = (
+        0x32C4AE2C1F1981195F9904466A39C9948FE30BBFF2660BE1715A4589334C74C7,
+        0xBC3736A2F4F6779C59BDCEE36B692153D0A9877CC62A474002DF32E52139F0A0,
+    )
+    n = 0xFFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFF7203DF6B21C6052B53BBF40939D54123
+
+
 class Test_Curve(WeierstrassInterface):
     """
     koclab.cs.ucsb.edu/teaching/ccs130h/2018/04ecc.pdf