diff options
Diffstat (limited to 'crypto/src/math/ec/rfc7748/X448Field.cs')
| -rw-r--r-- | crypto/src/math/ec/rfc7748/X448Field.cs | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/crypto/src/math/ec/rfc7748/X448Field.cs b/crypto/src/math/ec/rfc7748/X448Field.cs index ef4fd4627..6d8c60e78 100644 --- a/crypto/src/math/ec/rfc7748/X448Field.cs +++ b/crypto/src/math/ec/rfc7748/X448Field.cs @@ -46,6 +46,23 @@ namespace Org.BouncyCastle.Math.EC.Rfc7748 // } //} + public static int AreEqual(uint[] x, uint[] y) + { + uint d = 0; + for (int i = 0; i < Size; ++i) + { + d |= x[i] ^ y[i]; + } + d |= d >> 16; + d &= 0xFFFF; + return ((int)d - 1) >> 31; + } + + public static bool AreEqualVar(uint[] x, uint[] y) + { + return 0 != AreEqual(x, y); + } + public static void Carry(uint[] z) { uint z0 = z[0], z1 = z[1], z2 = z[2], z3 = z[3], z4 = z[4], z5 = z[5], z6 = z[6], z7 = z[7]; @@ -285,6 +302,23 @@ namespace Org.BouncyCastle.Math.EC.Rfc7748 Decode(u, 0, z); } + public static int IsOne(uint[] x) + { + uint d = x[0] ^ 1; + for (int i = 1; i < Size; ++i) + { + d |= x[i]; + } + d |= d >> 16; + d &= 0xFFFF; + return ((int)d - 1) >> 31; + } + + public static bool IsOneVar(uint[] x) + { + return 0 != IsOne(x); + } + public static int IsZero(uint[] x) { uint d = 0; |