diff options
| author | Peter Dettman <peter.dettman@bouncycastle.org> | 2014-02-27 08:16:31 +0400 |
|---|---|---|
| committer | Peter Dettman <peter.dettman@bouncycastle.org> | 2014-02-27 08:16:31 +0400 |
| commit | 8d7e53b43dbd1316bf4e3035fee35d8bc69bef3b (patch) | |
| tree | 786b6214788ec19e1e73a061b2e9245a82cbd09a /core/src/main/java/org/bouncycastle | |
| parent | 8f9e39574235b64f2003a649e967dd34fabacf01 (diff) | |
Simplify twice()
Diffstat (limited to 'core/src/main/java/org/bouncycastle')
| -rw-r--r-- | core/src/main/java/org/bouncycastle/math/ec/custom/sec/SecP521R1Field.java | 10 |
1 files changed, 3 insertions, 7 deletions
diff --git a/core/src/main/java/org/bouncycastle/math/ec/custom/sec/SecP521R1Field.java b/core/src/main/java/org/bouncycastle/math/ec/custom/sec/SecP521R1Field.java index 1608d406..df353034 100644 --- a/core/src/main/java/org/bouncycastle/math/ec/custom/sec/SecP521R1Field.java +++ b/core/src/main/java/org/bouncycastle/math/ec/custom/sec/SecP521R1Field.java @@ -133,13 +133,9 @@ public class SecP521R1Field public static void twice(int[] x, int[] z) { - int c = Nat.shiftUpBit(16, x, 0, z) | (x[16] << 1); - if (c > P16 || (c == P16 && Nat.eq(16, z, P))) - { - c += Nat.inc(16, z, 0); - c &= P16; - } - z[16] = c; + int x16 = x[16]; + int c = Nat.shiftUpBit(16, x, x16 << 23, z) | (x16 << 1); + z[16] = c & P16; } protected static void implMultiply(int[] x, int[] y, int[] zz) |