diff options
Diffstat (limited to 'crypto/src/math/ec/custom/sec/SecT193Field.cs')
| -rw-r--r-- | crypto/src/math/ec/custom/sec/SecT193Field.cs | 220 |
1 files changed, 206 insertions, 14 deletions
diff --git a/crypto/src/math/ec/custom/sec/SecT193Field.cs b/crypto/src/math/ec/custom/sec/SecT193Field.cs index 3d9937f75..b610bf554 100644 --- a/crypto/src/math/ec/custom/sec/SecT193Field.cs +++ b/crypto/src/math/ec/custom/sec/SecT193Field.cs @@ -9,12 +9,16 @@ using Org.BouncyCastle.Math.Raw; namespace Org.BouncyCastle.Math.EC.Custom.Sec { - internal class SecT193Field + internal static class SecT193Field { private const ulong M01 = 1UL; private const ulong M49 = ulong.MaxValue >> 15; +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + public static void Add(ReadOnlySpan<ulong> x, ReadOnlySpan<ulong> y, Span<ulong> z) +#else public static void Add(ulong[] x, ulong[] y, ulong[] z) +#endif { z[0] = x[0] ^ y[0]; z[1] = x[1] ^ y[1]; @@ -22,7 +26,23 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec z[3] = x[3] ^ y[3]; } +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + public static void AddBothTo(ReadOnlySpan<ulong> x, ReadOnlySpan<ulong> y, Span<ulong> z) +#else + public static void AddBothTo(ulong[] x, ulong[] y, ulong[] z) +#endif + { + z[0] ^= x[0] ^ y[0]; + z[1] ^= x[1] ^ y[1]; + z[2] ^= x[2] ^ y[2]; + z[3] ^= x[3] ^ y[3]; + } + +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + public static void AddExt(ReadOnlySpan<ulong> xx, ReadOnlySpan<ulong> yy, Span<ulong> zz) +#else public static void AddExt(ulong[] xx, ulong[] yy, ulong[] zz) +#endif { zz[0] = xx[0] ^ yy[0]; zz[1] = xx[1] ^ yy[1]; @@ -33,7 +53,11 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec zz[6] = xx[6] ^ yy[6]; } +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + public static void AddOne(ReadOnlySpan<ulong> x, Span<ulong> z) +#else public static void AddOne(ulong[] x, ulong[] z) +#endif { z[0] = x[0] ^ 1UL; z[1] = x[1]; @@ -41,7 +65,11 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec z[3] = x[3]; } +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + public static void AddTo(ReadOnlySpan<ulong> x, Span<ulong> z) +#else public static void AddTo(ulong[] x, ulong[] z) +#endif { z[0] ^= x[0]; z[1] ^= x[1]; @@ -54,9 +82,17 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec return Nat.FromBigInteger64(193, x); } +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + public static void HalfTrace(ReadOnlySpan<ulong> x, Span<ulong> z) +#else public static void HalfTrace(ulong[] x, ulong[] z) +#endif { +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + Span<ulong> tt = stackalloc ulong[8]; +#else ulong[] tt = Nat256.CreateExt64(); +#endif Nat256.Copy64(x, z); for (int i = 1; i < 193; i += 2) @@ -69,15 +105,24 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec } } +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + public static void Invert(ReadOnlySpan<ulong> x, Span<ulong> z) +#else public static void Invert(ulong[] x, ulong[] z) +#endif { if (Nat256.IsZero64(x)) throw new InvalidOperationException(); // Itoh-Tsujii inversion with bases { 2, 3 } +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + Span<ulong> t0 = stackalloc ulong[4]; + Span<ulong> t1 = stackalloc ulong[4]; +#else ulong[] t0 = Nat256.Create64(); ulong[] t1 = Nat256.Create64(); +#endif Square(x, t0); @@ -112,21 +157,55 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec Multiply(t0, t1, z); } +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + public static void Multiply(ReadOnlySpan<ulong> x, ReadOnlySpan<ulong> y, Span<ulong> z) +#else public static void Multiply(ulong[] x, ulong[] y, ulong[] z) +#endif { +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + Span<ulong> tt = stackalloc ulong[8]; +#else ulong[] tt = Nat256.CreateExt64(); +#endif ImplMultiply(x, y, tt); Reduce(tt, z); } +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + public static void MultiplyAddToExt(ReadOnlySpan<ulong> x, ReadOnlySpan<ulong> y, Span<ulong> zz) +#else public static void MultiplyAddToExt(ulong[] x, ulong[] y, ulong[] zz) +#endif { +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + Span<ulong> tt = stackalloc ulong[8]; +#else ulong[] tt = Nat256.CreateExt64(); +#endif ImplMultiply(x, y, tt); AddExt(zz, tt, zz); } +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + public static void MultiplyExt(ReadOnlySpan<ulong> x, ReadOnlySpan<ulong> y, Span<ulong> zz) +#else + public static void MultiplyExt(ulong[] x, ulong[] y, ulong[] zz) +#endif + { +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + zz[..8].Fill(0UL); +#else + Array.Clear(zz, 0, 8); +#endif + ImplMultiply(x, y, zz); + } + +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + public static void Reduce(ReadOnlySpan<ulong> xx, Span<ulong> z) +#else public static void Reduce(ulong[] xx, ulong[] z) +#endif { ulong x0 = xx[0], x1 = xx[1], x2 = xx[2], x3 = xx[3], x4 = xx[4], x5 = xx[5], x6 = xx[6]; @@ -157,7 +236,11 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec z[zOff + 3] = z3 & M01; } +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + public static void Sqrt(ReadOnlySpan<ulong> x, Span<ulong> z) +#else public static void Sqrt(ulong[] x, ulong[] z) +#endif { ulong c0 = Interleave.Unshuffle(x[0], x[1], out ulong e0); ulong c1 = Interleave.Unshuffle(x[2] , out ulong e1); @@ -169,30 +252,58 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec z[3] = (c1 >> 31); } +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + public static void Square(ReadOnlySpan<ulong> x, Span<ulong> z) +#else public static void Square(ulong[] x, ulong[] z) +#endif { +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + Span<ulong> tt = stackalloc ulong[8]; +#else ulong[] tt = Nat256.CreateExt64(); +#endif ImplSquare(x, tt); Reduce(tt, z); } +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + public static void SquareAddToExt(ReadOnlySpan<ulong> x, Span<ulong> zz) +#else public static void SquareAddToExt(ulong[] x, ulong[] zz) +#endif { +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + Span<ulong> tt = stackalloc ulong[8]; +#else ulong[] tt = Nat256.CreateExt64(); +#endif ImplSquare(x, tt); AddExt(zz, tt, zz); } +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + public static void SquareExt(ReadOnlySpan<ulong> x, Span<ulong> zz) +#else public static void SquareExt(ulong[] x, ulong[] zz) +#endif { ImplSquare(x, zz); } +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + public static void SquareN(ReadOnlySpan<ulong> x, int n, Span<ulong> z) +#else public static void SquareN(ulong[] x, int n, ulong[] z) +#endif { Debug.Assert(n > 0); +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + Span<ulong> tt = stackalloc ulong[8]; +#else ulong[] tt = Nat256.CreateExt64(); +#endif ImplSquare(x, tt); Reduce(tt, z); @@ -203,13 +314,21 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec } } +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + public static uint Trace(ReadOnlySpan<ulong> x) +#else public static uint Trace(ulong[] x) +#endif { // Non-zero-trace bits: 0 return (uint)(x[0]) & 1U; } - protected static void ImplCompactExt(ulong[] zz) +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + private static void ImplCompactExt(Span<ulong> zz) +#else + private static void ImplCompactExt(ulong[] zz) +#endif { ulong z0 = zz[0], z1 = zz[1], z2 = zz[2], z3 = zz[3], z4 = zz[4], z5 = zz[5], z6 = zz[6], z7 = zz[7]; zz[0] = z0 ^ (z1 << 49); @@ -224,7 +343,11 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec zz[7] = 0; } - protected static void ImplExpand(ulong[] x, ulong[] z) +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + private static void ImplExpand(ReadOnlySpan<ulong> x, Span<ulong> z) +#else + private static void ImplExpand(ulong[] x, ulong[] z) +#endif { ulong x0 = x[0], x1 = x[1], x2 = x[2], x3 = x[3]; z[0] = x0 & M49; @@ -233,7 +356,8 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec z[3] = ((x2 >> 19) ^ (x3 << 45)); } - protected static void ImplMultiply(ulong[] x, ulong[] y, ulong[] zz) +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + private static void ImplMultiply(ReadOnlySpan<ulong> x, ReadOnlySpan<ulong> y, Span<ulong> zz) { #if NETCOREAPP3_0_OR_GREATER if (Pclmulqdq.IsSupported) @@ -277,6 +401,56 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec ulong[] u = new ulong[8]; + ImplMulwAcc(u, f[0], g[0], zz[0..]); + ImplMulwAcc(u, f[1], g[1], zz[1..]); + ImplMulwAcc(u, f[2], g[2], zz[2..]); + ImplMulwAcc(u, f[3], g[3], zz[3..]); + + // U *= (1 - t^n) + for (int i = 5; i > 0; --i) + { + zz[i] ^= zz[i - 1]; + } + + ImplMulwAcc(u, f[0] ^ f[1], g[0] ^ g[1], zz[1..]); + ImplMulwAcc(u, f[2] ^ f[3], g[2] ^ g[3], zz[3..]); + + // V *= (1 - t^2n) + for (int i = 7; i > 1; --i) + { + zz[i] ^= zz[i - 2]; + } + + // Double-length recursion + { + ulong c0 = f[0] ^ f[2], c1 = f[1] ^ f[3]; + ulong d0 = g[0] ^ g[2], d1 = g[1] ^ g[3]; + ImplMulwAcc(u, c0 ^ c1, d0 ^ d1, zz[3..]); + Span<ulong> t = stackalloc ulong[3]; + ImplMulwAcc(u, c0, d0, t[0..]); + ImplMulwAcc(u, c1, d1, t[1..]); + ulong t0 = t[0], t1 = t[1], t2 = t[2]; + zz[2] ^= t0; + zz[3] ^= t0 ^ t1; + zz[4] ^= t2 ^ t1; + zz[5] ^= t2; + } + + ImplCompactExt(zz); + } +#else + private static void ImplMultiply(ulong[] x, ulong[] y, ulong[] zz) + { + /* + * "Two-level seven-way recursion" as described in "Batch binary Edwards", Daniel J. Bernstein. + */ + + ulong[] f = new ulong[4], g = new ulong[4]; + ImplExpand(x, f); + ImplExpand(y, g); + + ulong[] u = new ulong[8]; + ImplMulwAcc(u, f[0], g[0], zz, 0); ImplMulwAcc(u, f[1], g[1], zz, 1); ImplMulwAcc(u, f[2], g[2], zz, 2); @@ -314,8 +488,13 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec ImplCompactExt(zz); } +#endif - protected static void ImplMulwAcc(ulong[] u, ulong x, ulong y, ulong[] z, int zOff) +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + private static void ImplMulwAcc(Span<ulong> u, ulong x, ulong y, Span<ulong> z) +#else + private static void ImplMulwAcc(ulong[] u, ulong x, ulong y, ulong[] z, int zOff) +#endif { Debug.Assert(x >> 49 == 0); Debug.Assert(y >> 49 == 0); @@ -330,17 +509,17 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec u[7] = u[6] ^ y; uint j = (uint)x; - ulong g, h = 0, l = u[j & 7] - ^ (u[(j >> 3) & 7] << 3); + ulong g, h = 0, l = u[(int)j & 7] + ^ (u[(int)(j >> 3) & 7] << 3); int k = 36; do { j = (uint)(x >> k); - g = u[j & 7] - ^ u[(j >> 3) & 7] << 3 - ^ u[(j >> 6) & 7] << 6 - ^ u[(j >> 9) & 7] << 9 - ^ u[(j >> 12) & 7] << 12; + g = u[(int)j & 7] + ^ u[(int)(j >> 3) & 7] << 3 + ^ u[(int)(j >> 6) & 7] << 6 + ^ u[(int)(j >> 9) & 7] << 9 + ^ u[(int)(j >> 12) & 7] << 12; l ^= (g << k); h ^= (g >> -k); } @@ -348,13 +527,22 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec Debug.Assert(h >> 33 == 0); +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + z[0] ^= l & M49; + z[1] ^= (l >> 49) ^ (h << 15); +#else z[zOff ] ^= l & M49; z[zOff + 1] ^= (l >> 49) ^ (h << 15); +#endif } - protected static void ImplSquare(ulong[] x, ulong[] zz) +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + private static void ImplSquare(ReadOnlySpan<ulong> x, Span<ulong> zz) +#else + private static void ImplSquare(ulong[] x, ulong[] zz) +#endif { - zz[6] = (x[3] & M01); + zz[6] = x[3] & M01; #if NETCOREAPP3_0_OR_GREATER if (Bmi2.X64.IsSupported) @@ -369,7 +557,11 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec } #endif +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + Interleave.Expand64To128(x[..3], zz[..6]); +#else Interleave.Expand64To128(x, 0, 3, zz, 0); +#endif } } } |