Twisted Edwards curve related parameters

[pygost.git] / pygost / gost3410.py

diff --git a/pygost/gost3410.py b/pygost/gost3410.py
index ed84f3efbd88d5895e10b6eb9c669b6cadf06449..466918909f4b3e5ffa13f6f3389b193f573507c9 100644 (file)
--- a/pygost/gost3410.py
+++ b/pygost/gost3410.py
@@ -1,6 +1,6 @@
 # coding: utf-8
 # PyGOST -- Pure Python GOST cryptographic functions library
-# Copyright (C) 2015-2016 Sergey Matveev <stargrave@stargrave.org>
+# Copyright (C) 2015-2019 Sergey Matveev <stargrave@stargrave.org>
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -94,6 +94,14 @@ CURVE_PARAMS = {
         "0000000000000000000000000000000000000000000000000000000000000000",
         "41ECE55743711A8C3CBF3783CD08C0EE4D4DC440D4641A8F366E550DFDB3BB67",
     ),
+    "GostR3410_2012_TC26_256_ParamSetA": (
+        "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFD97",
+        "400000000000000000000000000000000FD8CDDFC87B6635C115AF556C360C67",
+        "C2173F1513981673AF4892C23035A27CE25E2013BF95AA33B22C656F277E7335",
+        "295F9BAE7428ED9CCC20E7C359A9D41A22FCCD9108E17BF7BA9337A6F8AE9513",
+        "91E38443A5E82C0D880923425712B2BB658B9196932E02C78B2582FE742DAA28",
+        "32879423AB1A0375895786C4BB46E9565FDE0B5344766740AF268ADB32322E5C",
+    ),
     "GostR3410_2012_TC26_ParamSetA": (
         "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFDC7",
         "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF27E69532F48D89116FF22B8D4E0560609B4B38ABFAD2B85DCACDB1411F10B275",
@@ -110,6 +118,14 @@ CURVE_PARAMS = {
         "00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002",
         "1A8F7EDA389B094C2C071E3647A8940F3C123B697578C213BE6DD9E6C8EC7335DCB228FD1EDF4A39152CBCAAF8C0398828041055F94CEEEC7E21340780FE41BD"
     ),
+    "GostR3410_2012_TC26_ParamSetC": (
+        "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFDC7",
+        "3FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFC98CDBA46506AB004C33A9FF5147502CC8EDA9E7A769A12694623CEF47F023ED",
+        "DC9203E514A721875485A529D2C722FB187BC8980EB866644DE41C68E143064546E861C0E2C9EDD92ADE71F46FCF50FF2AD97F951FDA9F2A2EB6546F39689BD3",
+        "B4C4EE28CEBC6C2C8AC12952CF37F16AC7EFB6A9F69F4B57FFDA2E4F0DE5ADE038CBC2FFF719D2C18DE0284B8BFEF3B52B8CC7A5F5BF0A3C8D2319A5312557E1",
+        "E2E31EDFC23DE7BDEBE241CE593EF5DE2295B7A9CBAEF021D385F7074CEA043AA27272A7AE602BF2A7B9033DB9ED3610C6FB85487EAE97AAC5BC7928C1950148",
+        "F5CE40D95B5EB899ABBCCFF5911CB8577939804D6527378B8C108C3D2090FF9BE18E2D33E3021ED2EF32D85822423B6304F726AA854BAE07D0396E9A9ADDC40F",
+    ),
 }
 for c, params in CURVE_PARAMS.items():
     CURVE_PARAMS[c] = [hexdec(param) for param in params]
@@ -162,9 +178,9 @@ class GOST3410Curve(object):
         y = y or self.y
         tx = x
         ty = y
-        degree -= 1
         if degree == 0:
             raise ValueError("Bad degree value")
+        degree -= 1
         while degree != 0:
             if degree & 1 == 1:
                 tx, ty = self._add(tx, ty, x, y)
@@ -173,25 +189,25 @@ class GOST3410Curve(object):
         return tx, ty
 
 
-def public_key(curve, private_key):
+def public_key(curve, prv):
     """ Generate public key from the private one
 
     :param GOST3410Curve curve: curve to use
-    :param long private_key: private key
-    :return: public key's parts, X and Y
+    :param long prv: private key
+    :returns: public key's parts, X and Y
     :rtype: (long, long)
     """
-    return curve.exp(private_key)
+    return curve.exp(prv)
 
 
-def sign(curve, private_key, digest, mode=2001):
+def sign(curve, prv, digest, mode=2001):
     """ Calculate signature for provided digest
 
     :param GOST3410Curve curve: curve to use
-    :param long private_key: private key
+    :param long prv: private key
     :param digest: digest for signing
     :type digest: bytes, 32 or 64 bytes
-    :return: signature
+    :returns: signature
     :rtype: bytes, 64 or 128 bytes
     """
     size = MODE2SIZE[mode]
@@ -207,7 +223,7 @@ def sign(curve, private_key, digest, mode=2001):
         r %= q
         if r == 0:
             continue
-        d = private_key * r
+        d = prv * r
         k *= e
         s = (d + k) % q
         if s == 0:
@@ -260,13 +276,13 @@ def verify(curve, pub, digest, signature, mode=2001):
     return lm == r
 
 
-def prv_unmarshal(private_key):
+def prv_unmarshal(prv):
     """Unmarshal private key
 
-    :param bytes private_key: serialized private key
+    :param bytes prv: serialized private key
     :rtype: long
     """
-    return bytes2long(private_key[::-1])
+    return bytes2long(prv[::-1])
 
 
 def pub_marshal(pub, mode=2001):