diff options
Diffstat (limited to 'crypto/src/math/ec/custom/sec/Nat256.cs')
| -rw-r--r-- | crypto/src/math/ec/custom/sec/Nat256.cs | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/crypto/src/math/ec/custom/sec/Nat256.cs b/crypto/src/math/ec/custom/sec/Nat256.cs index c846f56fb..aa6f4e5eb 100644 --- a/crypto/src/math/ec/custom/sec/Nat256.cs +++ b/crypto/src/math/ec/custom/sec/Nat256.cs @@ -781,6 +781,23 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec return c == 0 ? 0 : Inc(z, zOff + 4); } + public static uint Mul33WordAdd(uint x, uint y, uint[] z, int zOff) + { + Debug.Assert(x >> 31 == 0); + Debug.Assert(zOff <= 5); + ulong c = 0, yVal = y; + c += yVal * x + z[zOff + 0]; + z[zOff + 0] = (uint)c; + c >>= 32; + c += yVal + z[zOff + 1]; + z[zOff + 1] = (uint)c; + c >>= 32; + c += z[zOff + 2]; + z[zOff + 2] = (uint)c; + c >>= 32; + return c == 0 ? 0 : Inc(z, zOff + 3); + } + public static uint MulWordDwordAdd(uint x, ulong y, uint[] z, int zOff) { Debug.Assert(zOff <= 5); |