diff options
Diffstat (limited to 'crypto/src/math/ec/multiplier/FixedPointUtilities.cs')
| -rw-r--r-- | crypto/src/math/ec/multiplier/FixedPointUtilities.cs | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/crypto/src/math/ec/multiplier/FixedPointUtilities.cs b/crypto/src/math/ec/multiplier/FixedPointUtilities.cs index ddce74d31..8a04fcdc1 100644 --- a/crypto/src/math/ec/multiplier/FixedPointUtilities.cs +++ b/crypto/src/math/ec/multiplier/FixedPointUtilities.cs @@ -4,6 +4,12 @@ namespace Org.BouncyCastle.Math.EC.Multiplier { public class FixedPointUtilities { + public static int GetCombSize(ECCurve c) + { + BigInteger order = c.Order; + return order == null ? c.FieldSize + 1 : order.BitLength; + } + public static FixedPointPreCompInfo GetFixedPointPreCompInfo(PreCompInfo preCompInfo) { if ((preCompInfo != null) && (preCompInfo is FixedPointPreCompInfo)) @@ -24,11 +30,7 @@ namespace Org.BouncyCastle.Math.EC.Multiplier if (lookupTable == null || lookupTable.Length != n) { - BigInteger order = c.Order; - if (order == null) - throw new InvalidOperationException("fixed-point precomputation needs the curve order"); - - int bits = order.BitLength; + int bits = GetCombSize(c); int d = (bits + width - 1) / width; ECPoint[] pow2Table = new ECPoint[width]; |