diff options
Diffstat (limited to 'crypto/src/math/ec/custom/sec/SecT113R2Curve.cs')
-rw-r--r-- | crypto/src/math/ec/custom/sec/SecT113R2Curve.cs | 28 |
1 files changed, 24 insertions, 4 deletions
diff --git a/crypto/src/math/ec/custom/sec/SecT113R2Curve.cs b/crypto/src/math/ec/custom/sec/SecT113R2Curve.cs index efe422806..84b20e026 100644 --- a/crypto/src/math/ec/custom/sec/SecT113R2Curve.cs +++ b/crypto/src/math/ec/custom/sec/SecT113R2Curve.cs @@ -10,6 +10,7 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec { private const int SECT113R2_DEFAULT_COORDS = COORD_LAMBDA_PROJECTIVE; private const int SECT113R2_FE_LONGS = 2; + private static readonly ECFieldElement[] SECT113R2_AFFINE_ZS = new ECFieldElement[] { new SecT113FieldElement(BigInteger.One) }; protected readonly SecT113R2Point m_infinity; @@ -114,7 +115,7 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec } private class SecT113R2LookupTable - : ECLookupTable + : AbstractECLookupTable { private readonly SecT113R2Curve m_outer; private readonly ulong[] m_table; @@ -127,12 +128,12 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec this.m_size = size; } - public virtual int Size + public override int Size { get { return m_size; } } - public virtual ECPoint Lookup(int index) + public override ECPoint Lookup(int index) { ulong[] x = Nat128.Create64(), y = Nat128.Create64(); int pos = 0; @@ -150,7 +151,26 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec pos += (SECT113R2_FE_LONGS * 2); } - return m_outer.CreateRawPoint(new SecT113FieldElement(x), new SecT113FieldElement(y), false); + return CreatePoint(x, y); + } + + public override ECPoint LookupVar(int index) + { + ulong[] x = Nat128.Create64(), y = Nat128.Create64(); + int pos = index * SECT113R2_FE_LONGS * 2; + + for (int j = 0; j < SECT113R2_FE_LONGS; ++j) + { + x[j] = m_table[pos + j]; + y[j] = m_table[pos + SECT113R2_FE_LONGS + j]; + } + + return CreatePoint(x, y); + } + + private ECPoint CreatePoint(ulong[] x, ulong[] y) + { + return m_outer.CreateRawPoint(new SecT113FieldElement(x), new SecT113FieldElement(y), SECT113R2_AFFINE_ZS, false); } } } |