diff options
Diffstat (limited to 'crypto/src/math/ec/Mod.cs')
| -rw-r--r-- | crypto/src/math/ec/Mod.cs | 24 |
1 files changed, 17 insertions, 7 deletions
diff --git a/crypto/src/math/ec/Mod.cs b/crypto/src/math/ec/Mod.cs index 37958e57e..80534ca9f 100644 --- a/crypto/src/math/ec/Mod.cs +++ b/crypto/src/math/ec/Mod.cs @@ -49,9 +49,9 @@ namespace Org.BouncyCastle.Math.EC if (Nat.Gte(len, u, v)) { - Nat.Sub(len, u, v, u); + Nat.SubFrom(len, v, u); Debug.Assert((u[0] & 1) == 0); - ac += Nat.Sub(len, a, b, a) - bc; + ac += Nat.SubFrom(len, b, a) - bc; InversionStep(p, u, uvLen, a, ref ac); if (Nat.IsOne(len, u)) { @@ -61,9 +61,9 @@ namespace Org.BouncyCastle.Math.EC } else { - Nat.Sub(len, v, u, v); + Nat.SubFrom(len, u, v); Debug.Assert((v[0] & 1) == 0); - bc += Nat.Sub(len, b, a, b) - ac; + bc += Nat.SubFrom(len, a, b) - ac; InversionStep(p, v, uvLen, b, ref bc); if (Nat.IsOne(len, v)) { @@ -99,13 +99,23 @@ namespace Org.BouncyCastle.Math.EC return s; } + public static void Add(uint[] p, uint[] x, uint[] y, uint[] z) + { + int len = p.Length; + uint c = Nat.Add(len, x, y, z); + if (c != 0) + { + Nat.SubFrom(len, p, z); + } + } + public static void Subtract(uint[] p, uint[] x, uint[] y, uint[] z) { int len = p.Length; int c = Nat.Sub(len, x, y, z); if (c != 0) { - Nat.Add(len, z, p, z); + Nat.AddTo(len, p, z); } } @@ -146,11 +156,11 @@ namespace Org.BouncyCastle.Math.EC { if (xc < 0) { - xc += (int)Nat.Add(len, x, p, x); + xc += (int)Nat.AddTo(len, p, x); } else { - xc += Nat.Sub(len, x, p, x); + xc += Nat.SubFrom(len, p, x); } } |