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| author | Peter Dettman <peter.dettman@bouncycastle.org> | 2022-10-07 20:05:14 +0700 |
|---|---|---|
| committer | Peter Dettman <peter.dettman@bouncycastle.org> | 2022-10-07 20:05:14 +0700 |
| commit | 782382c6f665a022effa71a3f7738cf1e09d9866 (patch) | |
| tree | 66311deab21b35bc671561cbb419a0122c1b14f5 /crypto/src/math/ec/multiplier/FixedPointCombMultiplier.cs | |
| parent | Fix exception type (diff) | |
| download | BouncyCastle.NET-ed25519-782382c6f665a022effa71a3f7738cf1e09d9866.tar.xz | |
Span usage in Math.Raw
Diffstat (limited to 'crypto/src/math/ec/multiplier/FixedPointCombMultiplier.cs')
| -rw-r--r-- | crypto/src/math/ec/multiplier/FixedPointCombMultiplier.cs | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/crypto/src/math/ec/multiplier/FixedPointCombMultiplier.cs b/crypto/src/math/ec/multiplier/FixedPointCombMultiplier.cs index 37e5b5c29..6449e1d8b 100644 --- a/crypto/src/math/ec/multiplier/FixedPointCombMultiplier.cs +++ b/crypto/src/math/ec/multiplier/FixedPointCombMultiplier.cs @@ -28,18 +28,25 @@ namespace Org.BouncyCastle.Math.EC.Multiplier int width = info.Width; int d = (size + width - 1) / width; + int fullComb = d * width; ECPoint R = c.Infinity; - int fullComb = d * width; +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + int KLen = Nat.GetLengthForBits(fullComb); + Span<uint> K = KLen <= 32 + ? stackalloc uint[KLen] + : new uint[KLen]; + Nat.FromBigInteger(fullComb, k, K); +#else uint[] K = Nat.FromBigInteger(fullComb, k); +#endif - int top = fullComb - 1; - for (int i = 0; i < d; ++i) + for (int i = 1; i <= d; ++i) { uint secretIndex = 0; - for (int j = top - i; j >= 0; j -= d) + for (int j = fullComb - i; j >= 0; j -= d) { uint secretBit = K[j >> 5] >> (j & 0x1F); secretIndex ^= secretBit >> 1; |