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| author | Peter Dettman <peter.dettman@bouncycastle.org> | 2022-10-21 01:00:40 +0700 |
|---|---|---|
| committer | Peter Dettman <peter.dettman@bouncycastle.org> | 2022-10-21 01:00:40 +0700 |
| commit | 975ccde41b51c6ca564f67b678aeca77b51c02a3 (patch) | |
| tree | fb1aa374dc01e588e5ed01431d8808b5e3e28516 | |
| parent | Remove unnecessary special cases (diff) | |
| download | BouncyCastle.NET-ed25519-975ccde41b51c6ca564f67b678aeca77b51c02a3.tar.xz | |
Refactoring in Pqc.Crypto.Cmce (performance)
| -rw-r--r-- | crypto/src/pqc/crypto/cmce/CmceEngine.cs | 50 |
1 files changed, 44 insertions, 6 deletions
diff --git a/crypto/src/pqc/crypto/cmce/CmceEngine.cs b/crypto/src/pqc/crypto/cmce/CmceEngine.cs index 9641cb6fb..10b08e708 100644 --- a/crypto/src/pqc/crypto/cmce/CmceEngine.cs +++ b/crypto/src/pqc/crypto/cmce/CmceEngine.cs @@ -1,4 +1,7 @@ using System; +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER +using System.Runtime.InteropServices; +#endif using Org.BouncyCastle.Asn1.Nist; using Org.BouncyCastle.Crypto; @@ -1482,11 +1485,25 @@ namespace Org.BouncyCastle.Pqc.Crypto.Cmce mask = (byte)(mat_row[i] ^ mat_k[i]); mask >>= j; mask &= 1; - mask = (byte)-mask; - for (c = 0; c < SYS_N / 8; c++) + c = 0; + +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + ulong mask64 = 0UL - mask; + int limit64 = (SYS_N / 8) - 8; + while (c <= limit64) + { + ulong t0 = MemoryMarshal.Read<ulong>(mat_k.AsSpan(c)) & mask64; + ulong t1 = MemoryMarshal.Read<ulong>(mat_row.AsSpan(c)) ^ t0; + MemoryMarshal.Write(mat_row.AsSpan(c), ref t1); + c += 8; + } +#endif + byte maskByte = (byte)-mask; + while (c < SYS_N / 8) { - mat_row[c] ^= (byte)(mat_k[c] & mask); + mat_row[c] ^= (byte)(mat_k[c] & maskByte); + ++c; } } @@ -1505,11 +1522,32 @@ namespace Org.BouncyCastle.Pqc.Crypto.Cmce byte[] mat_k = mat[k]; mask = (byte)(mat_k[i] >> j); mask &= 1; - mask = (byte)-mask; - for (c = 0; c < SYS_N / 8; c++) + //mask = (byte)-mask; + + //for (c = 0; c < SYS_N / 8; c++) + //{ + // mat_k[c] ^= (byte)(mat_row[c] & mask); + //} + + c = 0; + +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + ulong mask64 = 0UL - mask; + int limit64 = (SYS_N / 8) - 8; + while (c <= limit64) + { + ulong t0 = MemoryMarshal.Read<ulong>(mat_row.AsSpan(c)) & mask64; + ulong t1 = MemoryMarshal.Read<ulong>(mat_k.AsSpan(c)) ^ t0; + MemoryMarshal.Write(mat_k.AsSpan(c), ref t1); + c += 8; + } +#endif + byte maskByte = (byte)-mask; + while (c < SYS_N / 8) { - mat_k[c] ^= (byte)(mat_row[c] & mask); + mat_k[c] ^= (byte)(mat_row[c] & maskByte); + ++c; } } } |