1 files changed, 23 insertions, 0 deletions
diff --git a/crypto/src/math/ec/custom/sec/SecT193Field.cs b/crypto/src/math/ec/custom/sec/SecT193Field.cs
index 5154f1e0a..41acb4f94 100644
--- a/crypto/src/math/ec/custom/sec/SecT193Field.cs
+++ b/crypto/src/math/ec/custom/sec/SecT193Field.cs
@@ -132,6 +132,23 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec
z[zOff + 3] = z3 & M01;
}
+ public static void Sqrt(ulong[] x, ulong[] z)
+ {
+ ulong u0, u1;
+ u0 = Interleave.Unshuffle(x[0]); u1 = Interleave.Unshuffle(x[1]);
+ ulong e0 = (u0 & 0x00000000FFFFFFFFUL) | (u1 << 32);
+ ulong c0 = (u0 >> 32) | (u1 & 0xFFFFFFFF00000000UL);
+
+ u0 = Interleave.Unshuffle(x[2]);
+ ulong e1 = (u0 & 0x00000000FFFFFFFFUL) ^ (x[3] << 32);
+ ulong c1 = (u0 >> 32);
+
+ z[0] = e0 ^ (c0 << 8);
+ z[1] = e1 ^ (c1 << 8) ^ (c0 >> 56) ^ (c0 << 33);
+ z[2] = (c1 >> 56) ^ (c1 << 33) ^ (c0 >> 31);
+ z[3] = (c1 >> 31);
+ }
+
public static void Square(ulong[] x, ulong[] z)
{
ulong[] tt = Nat256.CreateExt64();
@@ -161,6 +178,12 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec
}
}
+ public static uint Trace(ulong[] x)
+ {
+ // Non-zero-trace bits: 0
+ return (uint)(x[0]) & 1U;
+ }
+
protected static void ImplCompactExt(ulong[] zz)
{
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];
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