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author | Jeffrey Stedfast <jeff@xamarin.com> | 2015-03-28 11:34:48 -0400 |
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committer | Jeffrey Stedfast <jeff@xamarin.com> | 2015-03-28 11:34:48 -0400 |
commit | 393ff28f041de50a02acf45e9c0ba603a08e31b2 (patch) | |
tree | 4e48155cc30595686cf48631dff5f04f9cbfc2a8 /crypto/src/math/raw/Nat512.cs | |
parent | Merge branch 'master' into vs2010 (diff) | |
parent | Improved docs and code cleanup (diff) | |
download | BouncyCastle.NET-ed25519-393ff28f041de50a02acf45e9c0ba603a08e31b2.tar.xz |
Merge branch 'master' into vs2010
Diffstat (limited to 'crypto/src/math/raw/Nat512.cs')
-rw-r--r-- | crypto/src/math/raw/Nat512.cs | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/crypto/src/math/raw/Nat512.cs b/crypto/src/math/raw/Nat512.cs new file mode 100644 index 000000000..a9ef2b3b6 --- /dev/null +++ b/crypto/src/math/raw/Nat512.cs @@ -0,0 +1,46 @@ +using System; +using System.Diagnostics; + +namespace Org.BouncyCastle.Math.Raw +{ + internal abstract class Nat512 + { + public static void Mul(uint[] x, uint[] y, uint[] zz) + { + Nat256.Mul(x, y, zz); + Nat256.Mul(x, 8, y, 8, zz, 16); + + uint c24 = Nat256.AddToEachOther(zz, 8, zz, 16); + uint c16 = c24 + Nat256.AddTo(zz, 0, zz, 8, 0); + c24 += Nat256.AddTo(zz, 24, zz, 16, c16); + + uint[] dx = Nat256.Create(), dy = Nat256.Create(); + bool neg = Nat256.Diff(x, 8, x, 0, dx, 0) != Nat256.Diff(y, 8, y, 0, dy, 0); + + uint[] tt = Nat256.CreateExt(); + Nat256.Mul(dx, dy, tt); + + c24 += neg ? Nat.AddTo(16, tt, 0, zz, 8) : (uint)Nat.SubFrom(16, tt, 0, zz, 8); + Nat.AddWordAt(32, c24, zz, 24); + } + + public static void Square(uint[] x, uint[] zz) + { + Nat256.Square(x, zz); + Nat256.Square(x, 8, zz, 16); + + uint c24 = Nat256.AddToEachOther(zz, 8, zz, 16); + uint c16 = c24 + Nat256.AddTo(zz, 0, zz, 8, 0); + c24 += Nat256.AddTo(zz, 24, zz, 16, c16); + + uint[] dx = Nat256.Create(); + Nat256.Diff(x, 8, x, 0, dx, 0); + + uint[] m = Nat256.CreateExt(); + Nat256.Square(dx, m); + + c24 += (uint)Nat.SubFrom(16, m, 0, zz, 8); + Nat.AddWordAt(32, c24, zz, 24); + } + } +} |