diff options
Diffstat (limited to 'crypto/src/math/ec/custom/sec/SecP224R1Field.cs')
| -rw-r--r-- | crypto/src/math/ec/custom/sec/SecP224R1Field.cs | 29 |
1 files changed, 26 insertions, 3 deletions
diff --git a/crypto/src/math/ec/custom/sec/SecP224R1Field.cs b/crypto/src/math/ec/custom/sec/SecP224R1Field.cs index 3f9f79fc3..17c9b92a5 100644 --- a/crypto/src/math/ec/custom/sec/SecP224R1Field.cs +++ b/crypto/src/math/ec/custom/sec/SecP224R1Field.cs @@ -101,7 +101,7 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec long cc = 0; cc += (long)xx[0] - t0; - z[0] = (uint)cc; + long z0 = (uint)cc; cc >>= 32; cc += (long)xx[1] - t1; z[1] = (uint)cc; @@ -110,7 +110,7 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec z[2] = (uint)cc; cc >>= 32; cc += (long)xx[3] + t0 - xx10; - z[3] = (uint)cc; + long z3 = (uint)cc; cc >>= 32; cc += (long)xx[4] + t1 - xx11; z[4] = (uint)cc; @@ -125,7 +125,30 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec Debug.Assert(cc >= 0); - Reduce32((uint)cc, z); + z3 += cc; + + z0 -= cc; + z[0] = (uint)z0; + cc = z0 >> 32; + if (cc != 0) + { + cc += (long)z[1]; + z[1] = (uint)cc; + cc >>= 32; + cc += (long)z[2]; + z[2] = (uint)cc; + z3 += cc >> 32; + } + z[3] = (uint)z3; + cc = z3 >> 32; + + Debug.Assert(cc == 0 || cc == 1); + + if ((cc != 0 && Nat.IncAt(7, z, 4) != 0) + || (z[6] == P6 && Nat224.Gte(z, P))) + { + AddPInvTo(z); + } } public static void Reduce32(uint x, uint[] z) |