diff options
Diffstat (limited to 'crypto/src/math/ec/custom/sec/SecP256K1Field.cs')
| -rw-r--r-- | crypto/src/math/ec/custom/sec/SecP256K1Field.cs | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/crypto/src/math/ec/custom/sec/SecP256K1Field.cs b/crypto/src/math/ec/custom/sec/SecP256K1Field.cs index 527360cf6..6fe575b38 100644 --- a/crypto/src/math/ec/custom/sec/SecP256K1Field.cs +++ b/crypto/src/math/ec/custom/sec/SecP256K1Field.cs @@ -13,7 +13,8 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec 0x00000000, 0x00000000, 0x00000000, 0xFFFFF85E, 0xFFFFFFFD, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF }; private const uint PExt15 = 0xFFFFFFFF; - private static readonly ulong PInv = 0x00000001000003D1UL; + private const ulong PInv = 0x00000001000003D1UL; + private const uint PInvLow = 0x3D1; public static void Add(uint[] x, uint[] y, uint[] z) { @@ -88,11 +89,11 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec public static void Reduce(uint[] tt, uint[] z) { long extra = -(long)tt[8]; - extra += (long)Nat256.MulWordAddExt((uint)PInv, tt, 8, tt, 0); + extra += (long)Nat256.MulWordAddExt(PInvLow, tt, 8, tt, 0); extra += (long)Nat256.AddToExt(tt, 8, tt, 1) << 32; extra += (long)tt[8]; - ulong c = Nat256.MulWordDwordAdd((uint)PInv, (ulong)extra, tt, 0); + ulong c = Nat256.MulWordDwordAdd(PInvLow, (ulong)extra, tt, 0); c += Nat256.AddDWord((ulong)extra, tt, 1); Debug.Assert(c == 0 || c == 1); |