diff options
Diffstat (limited to 'crypto/src/math/ec/custom/sec/SecT409Field.cs')
| -rw-r--r-- | crypto/src/math/ec/custom/sec/SecT409Field.cs | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/crypto/src/math/ec/custom/sec/SecT409Field.cs b/crypto/src/math/ec/custom/sec/SecT409Field.cs index 84eada96e..861b77aa1 100644 --- a/crypto/src/math/ec/custom/sec/SecT409Field.cs +++ b/crypto/src/math/ec/custom/sec/SecT409Field.cs @@ -165,6 +165,36 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec z[zOff + 6] = z6 & M25; } + 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]); u1 = Interleave.Unshuffle(x[3]); + ulong e1 = (u0 & 0x00000000FFFFFFFFUL) | (u1 << 32); + ulong c1 = (u0 >> 32) | (u1 & 0xFFFFFFFF00000000UL); + + u0 = Interleave.Unshuffle(x[4]); u1 = Interleave.Unshuffle(x[5]); + ulong e2 = (u0 & 0x00000000FFFFFFFFUL) | (u1 << 32); + ulong c2 = (u0 >> 32) | (u1 & 0xFFFFFFFF00000000UL); + + u0 = Interleave.Unshuffle(x[6]); + ulong e3 = (u0 & 0x00000000FFFFFFFFUL); + ulong c3 = (u0 >> 32); + + z[0] = e0 ^ (c0 << 44); + z[1] = e1 ^ (c1 << 44) ^ (c0 >> 20); + z[2] = e2 ^ (c2 << 44) ^ (c1 >> 20); + z[3] = e3 ^ (c3 << 44) ^ (c2 >> 20) ^ (c0 << 13); + z[4] = (c3 >> 20) ^ (c1 << 13) ^ (c0 >> 51); + z[5] = (c2 << 13) ^ (c1 >> 51); + z[6] = (c3 << 13) ^ (c2 >> 51); + + Debug.Assert((c3 >> 51) == 0); + } + public static void Square(ulong[] x, ulong[] z) { ulong[] tt = Nat.Create64(13); @@ -194,6 +224,12 @@ 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 z00 = zz[ 0], z01 = zz[ 1], z02 = zz[ 2], z03 = zz[ 3], z04 = zz[ 4], z05 = zz[ 5], z06 = zz[ 6]; |