diff options
Diffstat (limited to 'crypto/src/math/raw/Nat.cs')
| -rw-r--r-- | crypto/src/math/raw/Nat.cs | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/crypto/src/math/raw/Nat.cs b/crypto/src/math/raw/Nat.cs index cf6516c61..7ca60278a 100644 --- a/crypto/src/math/raw/Nat.cs +++ b/crypto/src/math/raw/Nat.cs @@ -195,6 +195,64 @@ namespace Org.BouncyCastle.Math.Raw return c == 0 ? 0 : IncAt(len, z, zOff, 1); } + public static uint CAdd(int len, int mask, uint[] x, uint[] y, uint[] z) + { + uint MASK = (uint)-(mask & 1); + + ulong c = 0; + for (int i = 0; i < len; ++i) + { + c += (ulong)x[i] + (y[i] & MASK); + z[i] = (uint)c; + c >>= 32; + } + return (uint)c; + } + + public static void CMov(int len, int mask, uint[] x, int xOff, uint[] z, int zOff) + { + uint MASK = (uint)-(mask & 1); + + for (int i = 0; i < len; ++i) + { + uint z_i = z[zOff + i], diff = z_i ^ x[xOff + i]; + z_i ^= (diff & MASK); + z[zOff + i] = z_i; + } + + //uint half = 0x55555555U, rest = half << (-(int)MASK); + + //for (int i = 0; i < len; ++i) + //{ + // uint z_i = z[zOff + i], diff = z_i ^ x[xOff + i]; + // z_i ^= (diff & half); + // z_i ^= (diff & rest); + // z[zOff + i] = z_i; + //} + } + + public static void CMov(int len, int mask, int[] x, int xOff, int[] z, int zOff) + { + mask = -(mask & 1); + + for (int i = 0; i < len; ++i) + { + int z_i = z[zOff + i], diff = z_i ^ x[xOff + i]; + z_i ^= (diff & mask); + z[zOff + i] = z_i; + } + + //int half = 0x55555555, rest = half << (-mask); + + //for (int i = 0; i < len; ++i) + //{ + // int z_i = z[zOff + i], diff = z_i ^ x[xOff + i]; + // z_i ^= (diff & half); + // z_i ^= (diff & rest); + // z[zOff + i] = z_i; + //} + } + public static void Copy(int len, uint[] x, uint[] z) { Array.Copy(x, 0, z, 0, len); @@ -448,6 +506,33 @@ namespace Org.BouncyCastle.Math.Raw } } + public static uint MulAddTo(int len, uint[] x, uint[] y, uint[] zz) + { + ulong zc = 0; + for (int i = 0; i < len; ++i) + { + ulong c = MulWordAddTo(len, x[i], y, 0, zz, i) & M; + c += zc + (zz[i + len] & M); + zz[i + len] = (uint)c; + zc = c >> 32; + } + return (uint)zc; + } + + public static uint MulAddTo(int len, uint[] x, int xOff, uint[] y, int yOff, uint[] zz, int zzOff) + { + ulong zc = 0; + for (int i = 0; i < len; ++i) + { + ulong c = MulWordAddTo(len, x[xOff + i], y, yOff, zz, zzOff) & M; + c += zc + (zz[zzOff + len] & M); + zz[zzOff + len] = (uint)c; + zc = c >> 32; + ++zzOff; + } + return (uint)zc; + } + public static uint Mul31BothAdd(int len, uint a, uint[] x, uint b, uint[] y, uint[] z, int zOff) { ulong c = 0, aVal = (ulong)a, bVal = (ulong)b; |