diff options
Diffstat (limited to 'crypto/src/math/ec/Nat.cs')
| -rw-r--r-- | crypto/src/math/ec/Nat.cs | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/crypto/src/math/ec/Nat.cs b/crypto/src/math/ec/Nat.cs index b0213fb97..819979473 100644 --- a/crypto/src/math/ec/Nat.cs +++ b/crypto/src/math/ec/Nat.cs @@ -59,6 +59,14 @@ namespace Org.BouncyCastle.Math.EC return (uint)c; } + public static uint AddWord(int len, uint x, uint[] z) + { + ulong c = (ulong)x + z[0]; + z[0] = (uint)c; + c >>= 32; + return c == 0 ? 0 : Inc(len, z, 1); + } + public static uint AddWordExt(int len, uint x, uint[] zz, int zzOff) { int extLen = len << 1; @@ -335,6 +343,30 @@ namespace Org.BouncyCastle.Math.EC return c >> 31; } + public static uint ShiftUpBits(int len, uint[] z, int bits, uint c) + { + Debug.Assert(bits > 0 && bits < 32); + for (int i = 0; i < len; ++i) + { + uint next = z[i]; + z[i] = (next << bits) | (c >> -bits); + c = next; + } + return c >> -bits; + } + + public static uint ShiftUpBits(int len, uint[] x, int bits, uint c, uint[] z) + { + Debug.Assert(bits > 0 && bits < 32); + for (int i = 0; i < len; ++i) + { + uint next = x[i]; + z[i] = (next << bits) | (c >> -bits); + c = next; + } + return c >> -bits; + } + public static void Square(int len, uint[] x, uint[] zz) { int extLen = len << 1; |