diff options
| -rw-r--r-- | crypto/src/math/ec/ECAlgorithms.cs | 18 | ||||
| -rw-r--r-- | crypto/src/util/Arrays.cs | 16 | ||||
| -rw-r--r-- | crypto/test/src/math/ec/test/TnafTest.cs | 2 |
3 files changed, 30 insertions, 6 deletions
diff --git a/crypto/src/math/ec/ECAlgorithms.cs b/crypto/src/math/ec/ECAlgorithms.cs index a1349a9e0..5d60de40f 100644 --- a/crypto/src/math/ec/ECAlgorithms.cs +++ b/crypto/src/math/ec/ECAlgorithms.cs @@ -10,14 +10,23 @@ namespace Org.BouncyCastle.Math.EC { public static bool IsF2mCurve(ECCurve c) { - IFiniteField field = c.Field; + return IsF2mField(c.Field); + } + + public static bool IsF2mField(IFiniteField field) + { return field.Dimension > 1 && field.Characteristic.Equals(BigInteger.Two) && field is IPolynomialExtensionField; } public static bool IsFpCurve(ECCurve c) { - return c.Field.Dimension == 1; + return IsFpField(c.Field); + } + + public static bool IsFpField(IFiniteField field) + { + return field.Dimension == 1; } public static ECPoint SumOfMultiplies(ECPoint[] ps, BigInteger[] ks) @@ -61,10 +70,9 @@ namespace Org.BouncyCastle.Math.EC Q = ImportPoint(cp, Q); // Point multiplication for Koblitz curves (using WTNAF) beats Shamir's trick - if (cp is F2mCurve) { - F2mCurve f2mCurve = (F2mCurve) cp; - if (f2mCurve.IsKoblitz) + AbstractF2mCurve f2mCurve = cp as AbstractF2mCurve; + if (f2mCurve != null && f2mCurve.IsKoblitz) { return ValidatePoint(P.Multiply(a).Add(Q.Multiply(b))); } diff --git a/crypto/src/util/Arrays.cs b/crypto/src/util/Arrays.cs index abea234a7..1f9711555 100644 --- a/crypto/src/util/Arrays.cs +++ b/crypto/src/util/Arrays.cs @@ -655,5 +655,21 @@ namespace Org.BouncyCastle.Utilities return result; } + + public static int[] Reverse(int[] a) + { + if (a == null) + return null; + + int p1 = 0, p2 = a.Length; + int[] result = new int[p2]; + + while (--p2 >= 0) + { + result[p2] = a[p1++]; + } + + return result; + } } } diff --git a/crypto/test/src/math/ec/test/TnafTest.cs b/crypto/test/src/math/ec/test/TnafTest.cs index c04ae00d2..f5a58e858 100644 --- a/crypto/test/src/math/ec/test/TnafTest.cs +++ b/crypto/test/src/math/ec/test/TnafTest.cs @@ -40,7 +40,7 @@ // { // X9ECParameters x9ECParameters = SecNamedCurves.GetByName(curveName); // -// F2mCurve curve = (F2mCurve)x9ECParameters.Curve; +// AbstractF2mCurve curve = (AbstractF2mCurve)x9ECParameters.Curve; // BigInteger n = curve.N; // // // The generator is multiplied by random b to get random q |