add secp112r1

Author: tomato42

src/ecdsa/__init__.py

@@ -19,6 +19,7 @@
     BRAINPOOLP320r1,
     BRAINPOOLP384r1,
     BRAINPOOLP512r1,
+    SECP112r1,
 )
 from .ecdh import (
     ECDH,
@@ -72,5 +73,6 @@
     BRAINPOOLP320r1,
     BRAINPOOLP384r1,
     BRAINPOOLP512r1,
+    SECP112r1,
 ]
 del _hush_pyflakes

src/ecdsa/curves.py

@@ -10,6 +10,7 @@
     "UnknownCurveError",
     "orderlen",
     "Curve",
+    "SECP112r1",
     "NIST192p",
     "NIST224p",
     "NIST256p",
@@ -49,6 +50,16 @@ def __repr__(self):
         return self.name
 
 
+# the SEC curves
+SECP112r1 = Curve(
+    "SECP112r1",
+    ecdsa.curve_112r1,
+    ecdsa.generator_112r1,
+    (1, 3, 132, 0, 6),
+    "secp112r1",
+)
+
+
 # the NIST curves
 NIST192p = Curve(
     "NIST192p",
@@ -167,6 +178,7 @@ def __repr__(self):
 )
 
 
+# no order in particular, but keep previously added curves first
 curves = [
     NIST192p,
     NIST224p,
@@ -181,6 +193,7 @@ def __repr__(self):
     BRAINPOOLP320r1,
     BRAINPOOLP384r1,
     BRAINPOOLP512r1,
+    SECP112r1,
 ]
 
 

src/ecdsa/ecdsa.py

@@ -294,6 +294,21 @@ def point_is_valid(generator, x, y):
     return True
 
 
+# secp112r1 curve
+_p = int(remove_whitespace("DB7C 2ABF62E3 5E668076 BEAD208B"), 16)
+# s = 00F50B02 8E4D696E 67687561 51752904 72783FB1
+_a = int(remove_whitespace("DB7C 2ABF62E3 5E668076 BEAD2088"), 16)
+_b = int(remove_whitespace("659E F8BA0439 16EEDE89 11702B22"), 16)
+_Gx = int(remove_whitespace("09487239 995A5EE7 6B55F9C2 F098"), 16)
+_Gy = int(remove_whitespace("A89C E5AF8724 C0A23E0E 0FF77500"), 16)
+_r = int(remove_whitespace("DB7C 2ABF62E3 5E7628DF AC6561C5"), 16)
+_h = 1
+curve_112r1 = ellipticcurve.CurveFp(_p, _a, _b, _h)
+generator_112r1 = ellipticcurve.PointJacobi(
+    curve_112r1, _Gx, _Gy, 1, _r, generator=True
+)
+
+
 # NIST Curve P-192:
 _p = 6277101735386680763835789423207666416083908700390324961279
 _r = 6277101735386680763835789423176059013767194773182842284081

src/ecdsa/test_pyecdsa.py

@@ -26,6 +26,7 @@
 from .util import number_to_string, encoded_oid_ecPublicKey, MalformedSignature
 from .curves import Curve, UnknownCurveError
 from .curves import (
+    SECP112r1,
     NIST192p,
     NIST224p,
     NIST256p,
@@ -866,6 +867,13 @@ def get_openssl_messagedigest_arg(self, hash_name):
     # vk: 3:OpenSSL->python  4:python->OpenSSL
     # sig: 5:OpenSSL->python 6:python->OpenSSL
 
+    @pytest.mark.skipif(
+        "secp112r1" not in OPENSSL_SUPPORTED_CURVES,
+        reason="system openssl does not support secp112r1",
+    )
+    def test_from_openssl_secp112r1(self):
+        return self.do_test_from_openssl(SECP112r1)
+
     @pytest.mark.skipif(
         "prime192v1" not in OPENSSL_SUPPORTED_CURVES,
         reason="system openssl does not support prime192v1",
@@ -1030,6 +1038,13 @@ def do_test_from_openssl(self, curve, hash_name="SHA1"):
         sk_from_p8 = SigningKey.from_pem(privkey_p8_pem)
         self.assertEqual(sk, sk_from_p8)
 
+    @pytest.mark.skipif(
+        "secp112r1" not in OPENSSL_SUPPORTED_CURVES,
+        reason="system openssl does not support secp112r1",
+    )
+    def test_to_openssl_secp112r1(self):
+        self.do_test_to_openssl(SECP112r1)
+
     @pytest.mark.skipif(
         "prime192v1" not in OPENSSL_SUPPORTED_CURVES,
         reason="system openssl does not support prime192v1",