add secp112r2

Author: tomato42

src/ecdsa/__init__.py

@@ -20,6 +20,7 @@
     BRAINPOOLP384r1,
     BRAINPOOLP512r1,
     SECP112r1,
+    SECP112r2,
 )
 from .ecdh import (
     ECDH,
@@ -74,5 +75,6 @@
     BRAINPOOLP384r1,
     BRAINPOOLP512r1,
     SECP112r1,
+    SECP112r2,
 ]
 del _hush_pyflakes

src/ecdsa/curves.py

@@ -11,6 +11,7 @@
     "orderlen",
     "Curve",
     "SECP112r1",
+    "SECP112r2",
     "NIST192p",
     "NIST224p",
     "NIST256p",
@@ -60,6 +61,15 @@ def __repr__(self):
 )
 
 
+SECP112r2 = Curve(
+    "SECP112r2",
+    ecdsa.curve_112r2,
+    ecdsa.generator_112r2,
+    (1, 3, 132, 0, 7),
+    "secp112r2",
+)
+
+
 # the NIST curves
 NIST192p = Curve(
     "NIST192p",
@@ -194,6 +204,7 @@ def __repr__(self):
     BRAINPOOLP384r1,
     BRAINPOOLP512r1,
     SECP112r1,
+    SECP112r2,
 ]
 
 

src/ecdsa/ecdsa.py

@@ -309,6 +309,21 @@ def point_is_valid(generator, x, y):
 )
 
 
+# secp112r2 curve
+_p = int(remove_whitespace("DB7C 2ABF62E3 5E668076 BEAD208B"), 16)
+# s = 022757A1 114D69E 67687561 51755316 C05E0BD4
+_a = int(remove_whitespace("6127 C24C05F3 8A0AAAF6 5C0EF02C"), 16)
+_b = int(remove_whitespace("51DE F1815DB5 ED74FCC3 4C85D709"), 16)
+_Gx = int(remove_whitespace("4BA30AB5 E892B4E1 649DD092 8643"), 16)
+_Gy = int(remove_whitespace("ADCD 46F5882E 3747DEF3 6E956E97"), 16)
+_r = int(remove_whitespace("36DF 0AAFD8B8 D7597CA1 0520D04B"), 16)
+_h = 4
+curve_112r2 = ellipticcurve.CurveFp(_p, _a, _b, _h)
+generator_112r2 = ellipticcurve.PointJacobi(
+    curve_112r2, _Gx, _Gy, 1, _r, generator=True
+)
+
+
 # NIST Curve P-192:
 _p = 6277101735386680763835789423207666416083908700390324961279
 _r = 6277101735386680763835789423176059013767194773182842284081

src/ecdsa/test_pyecdsa.py

@@ -27,6 +27,7 @@
 from .curves import Curve, UnknownCurveError
 from .curves import (
     SECP112r1,
+    SECP112r2,
     NIST192p,
     NIST224p,
     NIST256p,
@@ -874,6 +875,13 @@ def get_openssl_messagedigest_arg(self, hash_name):
     def test_from_openssl_secp112r1(self):
         return self.do_test_from_openssl(SECP112r1)
 
+    @pytest.mark.skipif(
+        "secp112r2" not in OPENSSL_SUPPORTED_CURVES,
+        reason="system openssl does not support secp112r2",
+    )
+    def test_from_openssl_secp112r2(self):
+        return self.do_test_from_openssl(SECP112r2)
+
     @pytest.mark.skipif(
         "prime192v1" not in OPENSSL_SUPPORTED_CURVES,
         reason="system openssl does not support prime192v1",
@@ -1045,6 +1053,13 @@ def do_test_from_openssl(self, curve, hash_name="SHA1"):
     def test_to_openssl_secp112r1(self):
         self.do_test_to_openssl(SECP112r1)
 
+    @pytest.mark.skipif(
+        "secp112r2" not in OPENSSL_SUPPORTED_CURVES,
+        reason="system openssl does not support secp112r2",
+    )
+    def test_to_openssl_secp112r2(self):
+        self.do_test_to_openssl(SECP112r2)
+
     @pytest.mark.skipif(
         "prime192v1" not in OPENSSL_SUPPORTED_CURVES,
         reason="system openssl does not support prime192v1",