1 files changed, 34 insertions, 0 deletions
diff --git a/crypto/src/math/ec/rfc7748/X25519Field.cs b/crypto/src/math/ec/rfc7748/X25519Field.cs
index ffede563b..d0b835226 100644
--- a/crypto/src/math/ec/rfc7748/X25519Field.cs
+++ b/crypto/src/math/ec/rfc7748/X25519Field.cs
@@ -48,6 +48,23 @@ namespace Org.BouncyCastle.Math.EC.Rfc7748
}
}
+ public static int AreEqual(int[] x, int[] y)
+ {
+ int d = 0;
+ for (int i = 0; i < Size; ++i)
+ {
+ d |= x[i] ^ y[i];
+ }
+ d |= d >> 16;
+ d &= 0xFFFF;
+ return (d - 1) >> 31;
+ }
+
+ public static bool AreEqualVar(int[] x, int[] y)
+ {
+ return 0 != AreEqual(x, y);
+ }
+
public static void Carry(int[] z)
{
int z0 = z[0], z1 = z[1], z2 = z[2], z3 = z[3], z4 = z[4];
@@ -258,6 +275,23 @@ namespace Org.BouncyCastle.Math.EC.Rfc7748
Decode(u, 0, z);
}
+ public static int IsOne(int[] x)
+ {
+ int d = x[0] ^ 1;
+ for (int i = 1; i < Size; ++i)
+ {
+ d |= x[i];
+ }
+ d |= d >> 16;
+ d &= 0xFFFF;
+ return (d - 1) >> 31;
+ }
+
+ public static bool IsOneVar(int[] x)
+ {
+ return 0 != IsOne(x);
+ }
+
public static int IsZero(int[] x)
{
int d = 0;
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