diff options
Diffstat (limited to 'crypto/src/math/ec/custom/sec/SecP192K1Field.cs')
| -rw-r--r-- | crypto/src/math/ec/custom/sec/SecP192K1Field.cs | 11 |
1 files changed, 3 insertions, 8 deletions
diff --git a/crypto/src/math/ec/custom/sec/SecP192K1Field.cs b/crypto/src/math/ec/custom/sec/SecP192K1Field.cs index 30c107c86..9da3c0257 100644 --- a/crypto/src/math/ec/custom/sec/SecP192K1Field.cs +++ b/crypto/src/math/ec/custom/sec/SecP192K1Field.cs @@ -12,7 +12,7 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec 0x00000000, 0xFFFFDC6E, 0xFFFFFFFD, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF }; private const uint PExt11 = 0xFFFFFFFF; private const ulong PInv = 0x00000001000011C9L; - private const uint PInvLow = 0x11C9; + private const uint PInv33 = 0x11C9; public static void Add(uint[] x, uint[] y, uint[] z) { @@ -86,13 +86,8 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec public static void Reduce(uint[] tt, uint[] z) { - long extra = -(long)tt[6]; - extra += (long)Nat192.MulWordAddExt(PInvLow, tt, 6, tt, 0); - extra += (long)Nat192.AddToExt(tt, 6, tt, 1) << 32; - extra += (long)tt[6]; - - ulong c = Nat192.MulWordDwordAdd(PInvLow, (ulong)extra, tt, 0); - c += Nat192.AddDWord((ulong)extra, tt, 1); + ulong c = Nat192.Mul33AddExt(PInv33, tt, 6, tt, 0); + c = Nat192.Mul33DWordAdd(PInv33, c, tt, 0); Debug.Assert(c == 0 || c == 1); |