diff options
Diffstat (limited to 'crypto/src/math/raw/Nat448.cs')
| -rw-r--r-- | crypto/src/math/raw/Nat448.cs | 45 |
1 files changed, 44 insertions, 1 deletions
diff --git a/crypto/src/math/raw/Nat448.cs b/crypto/src/math/raw/Nat448.cs index 898e33199..5189d8936 100644 --- a/crypto/src/math/raw/Nat448.cs +++ b/crypto/src/math/raw/Nat448.cs @@ -98,13 +98,35 @@ namespace Org.BouncyCastle.Math.Raw Nat.AddWordAt(28, c21, zz, 21); } +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + public static void Mul(ReadOnlySpan<uint> x, ReadOnlySpan<uint> y, Span<uint> zz) + { + Nat224.Mul(x, y, zz); + Nat224.Mul(x[7..], y[7..], zz[14..]); + + uint c21 = Nat224.AddToEachOther(zz[7..], zz[14..]); + uint c14 = c21 + Nat224.AddTo(zz, zz[7..], 0U); + c21 += Nat224.AddTo(zz[21..], zz[14..], c14); + + Span<uint> dx = stackalloc uint[7]; + Span<uint> dy = stackalloc uint[7]; + bool neg = Nat224.Diff(x[7..], x, dx) != Nat224.Diff(y[7..], y, dy); + + Span<uint> tt = stackalloc uint[14]; + Nat224.Mul(dx, dy, tt); + + c21 += neg ? Nat.AddTo(14, tt, zz[7..]) : (uint)Nat.SubFrom(14, tt, zz[7..]); + Nat.AddWordAt(28, c21, zz, 21); + } +#endif + public static void Square(uint[] x, uint[] zz) { Nat224.Square(x, zz); Nat224.Square(x, 7, zz, 14); uint c21 = Nat224.AddToEachOther(zz, 7, zz, 14); - uint c14 = c21 + Nat224.AddTo(zz, 0, zz, 7, 0); + uint c14 = c21 + Nat224.AddTo(zz, 0, zz, 7, 0U); c21 += Nat224.AddTo(zz, 21, zz, 14, c14); uint[] dx = Nat224.Create(); @@ -117,6 +139,27 @@ namespace Org.BouncyCastle.Math.Raw Nat.AddWordAt(28, c21, zz, 21); } +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + public static void Square(ReadOnlySpan<uint> x, Span<uint> zz) + { + Nat224.Square(x, zz); + Nat224.Square(x[7..], zz[14..]); + + uint c21 = Nat224.AddToEachOther(zz[7..], zz[14..]); + uint c14 = c21 + Nat224.AddTo(zz, zz[7..], 0U); + c21 += Nat224.AddTo(zz[21..], zz[14..], c14); + + Span<uint> dx = stackalloc uint[7]; + Nat224.Diff(x[7..], x, dx); + + Span<uint> tt = stackalloc uint[14]; + Nat224.Square(dx, tt); + + c21 += (uint)Nat.SubFrom(14, tt, zz[7..]); + Nat.AddWordAt(28, c21, zz, 21); + } +#endif + public static BigInteger ToBigInteger64(ulong[] x) { byte[] bs = new byte[56]; |