diff options
Diffstat (limited to 'crypto/src/math/ec/custom/sec/SecP224R1Curve.cs')
-rw-r--r-- | crypto/src/math/ec/custom/sec/SecP224R1Curve.cs | 28 |
1 files changed, 24 insertions, 4 deletions
diff --git a/crypto/src/math/ec/custom/sec/SecP224R1Curve.cs b/crypto/src/math/ec/custom/sec/SecP224R1Curve.cs index ec34390aa..bb63ebf5e 100644 --- a/crypto/src/math/ec/custom/sec/SecP224R1Curve.cs +++ b/crypto/src/math/ec/custom/sec/SecP224R1Curve.cs @@ -13,6 +13,7 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec private const int SECP224R1_DEFAULT_COORDS = COORD_JACOBIAN; private const int SECP224R1_FE_INTS = 7; + private static readonly ECFieldElement[] SECP224R1_AFFINE_ZS = new ECFieldElement[] { new SecP224R1FieldElement(BigInteger.One) }; protected readonly SecP224R1Point m_infinity; @@ -94,7 +95,7 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec } private class SecP224R1LookupTable - : ECLookupTable + : AbstractECLookupTable { private readonly SecP224R1Curve m_outer; private readonly uint[] m_table; @@ -107,12 +108,12 @@ 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) { uint[] x = Nat224.Create(), y = Nat224.Create(); int pos = 0; @@ -130,7 +131,26 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec pos += (SECP224R1_FE_INTS * 2); } - return m_outer.CreateRawPoint(new SecP224R1FieldElement(x), new SecP224R1FieldElement(y), false); + return CreatePoint(x, y); + } + + public override ECPoint LookupVar(int index) + { + uint[] x = Nat224.Create(), y = Nat224.Create(); + int pos = index * SECP224R1_FE_INTS * 2; + + for (int j = 0; j < SECP224R1_FE_INTS; ++j) + { + x[j] = m_table[pos + j]; + y[j] = m_table[pos + SECP224R1_FE_INTS + j]; + } + + return CreatePoint(x, y); + } + + private ECPoint CreatePoint(uint[] x, uint[] y) + { + return m_outer.CreateRawPoint(new SecP224R1FieldElement(x), new SecP224R1FieldElement(y), SECP224R1_AFFINE_ZS, false); } } } |