add secp128r1

Author: tomato42

src/ecdsa/__init__.py

@@ -21,6 +21,7 @@
     BRAINPOOLP512r1,
     SECP112r1,
     SECP112r2,
+    SECP128r1,
 )
 from .ecdh import (
     ECDH,
@@ -76,5 +77,6 @@
     BRAINPOOLP512r1,
     SECP112r1,
     SECP112r2,
+    SECP128r1,
 ]
 del _hush_pyflakes

src/ecdsa/curves.py

@@ -12,6 +12,7 @@
     "Curve",
     "SECP112r1",
     "SECP112r2",
+    "SECP128r1",
     "NIST192p",
     "NIST224p",
     "NIST256p",
@@ -70,6 +71,15 @@ def __repr__(self):
 )
 
 
+SECP128r1 = Curve(
+    "SECP128r1",
+    ecdsa.curve_128r1,
+    ecdsa.generator_128r1,
+    (1, 3, 132, 0, 28),
+    "secp128r1",
+)
+
+
 # the NIST curves
 NIST192p = Curve(
     "NIST192p",
@@ -205,6 +215,7 @@ def __repr__(self):
     BRAINPOOLP512r1,
     SECP112r1,
     SECP112r2,
+    SECP128r1,
 ]
 
 

src/ecdsa/ecdsa.py

@@ -324,6 +324,21 @@ def point_is_valid(generator, x, y):
 )
 
 
+# secp128r1 curve
+_p = int(remove_whitespace("FFFFFFFD FFFFFFFF FFFFFFFF FFFFFFFF"), 16)
+# S = 000E0D4D 69E6768 75615175 0CC03A44 73D03679
+# _a = -3
+_b = int(remove_whitespace("E87579C1 1079F43D D824993C 2CEE5ED3"), 16)
+_Gx = int(remove_whitespace("161FF752 8B899B2D 0C28607C A52C5B86"), 16)
+_Gy = int(remove_whitespace("CF5AC839 5BAFEB13 C02DA292 DDED7A83"), 16)
+_r = int(remove_whitespace("FFFFFFFE 00000000 75A30D1B 9038A115"), 16)
+_h = 1
+curve_128r1 = ellipticcurve.CurveFp(_p, -3, _b, _h)
+generator_128r1 = ellipticcurve.PointJacobi(
+    curve_128r1, _Gx, _Gy, 1, _r, generator=True
+)
+
+
 # NIST Curve P-192:
 _p = 6277101735386680763835789423207666416083908700390324961279
 _r = 6277101735386680763835789423176059013767194773182842284081

src/ecdsa/test_pyecdsa.py

@@ -28,6 +28,7 @@
 from .curves import (
     SECP112r1,
     SECP112r2,
+    SECP128r1,
     NIST192p,
     NIST224p,
     NIST256p,
@@ -882,6 +883,14 @@ def test_from_openssl_secp112r1(self):
     def test_from_openssl_secp112r2(self):
         return self.do_test_from_openssl(SECP112r2)
 
+    @pytest.mark.skipif(
+        "secp128r1" not in OPENSSL_SUPPORTED_CURVES,
+        reason="system openssl does not support secp128r1",
+    )
+    def test_from_openssl_secp128r1(self):
+        return self.do_test_from_openssl(SECP128r1)
+
+    @pytest.mark.slow
     @pytest.mark.skipif(
         "prime192v1" not in OPENSSL_SUPPORTED_CURVES,
         reason="system openssl does not support prime192v1",
@@ -1060,6 +1069,14 @@ def test_to_openssl_secp112r1(self):
     def test_to_openssl_secp112r2(self):
         self.do_test_to_openssl(SECP112r2)
 
+    @pytest.mark.skipif(
+        "secp128r1" not in OPENSSL_SUPPORTED_CURVES,
+        reason="system openssl does not support secp128r1",
+    )
+    def test_to_openssl_secp128r1(self):
+        self.do_test_to_openssl(SECP128r1)
+
+    @pytest.mark.slow
     @pytest.mark.skipif(
         "prime192v1" not in OPENSSL_SUPPORTED_CURVES,
         reason="system openssl does not support prime192v1",