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using System;
using Org.BouncyCastle.Math.Raw;
using Org.BouncyCastle.Utilities.Encoders;
namespace Org.BouncyCastle.Math.EC.Custom.GM
{
internal class SM2P256V1Curve
: AbstractFpCurve
{
public static readonly BigInteger q = SM2P256V1FieldElement.Q;
private const int SM2P256V1_DEFAULT_COORDS = COORD_JACOBIAN;
private const int SM2P256V1_FE_INTS = 8;
private static readonly ECFieldElement[] SM2P256V1_AFFINE_ZS = new ECFieldElement[] { new SM2P256V1FieldElement(BigInteger.One) };
protected readonly SM2P256V1Point m_infinity;
public SM2P256V1Curve()
: base(q)
{
this.m_infinity = new SM2P256V1Point(this, null, null);
this.m_a = FromBigInteger(new BigInteger(1,
Hex.DecodeStrict("FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFC")));
this.m_b = FromBigInteger(new BigInteger(1,
Hex.DecodeStrict("28E9FA9E9D9F5E344D5A9E4BCF6509A7F39789F515AB8F92DDBCBD414D940E93")));
this.m_order = new BigInteger(1, Hex.DecodeStrict("FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFF7203DF6B21C6052B53BBF40939D54123"));
this.m_cofactor = BigInteger.One;
this.m_coord = SM2P256V1_DEFAULT_COORDS;
}
protected override ECCurve CloneCurve()
{
return new SM2P256V1Curve();
}
public override bool SupportsCoordinateSystem(int coord)
{
switch (coord)
{
case COORD_JACOBIAN:
return true;
default:
return false;
}
}
public virtual BigInteger Q
{
get { return q; }
}
public override ECPoint Infinity
{
get { return m_infinity; }
}
public override int FieldSize
{
get { return q.BitLength; }
}
public override ECFieldElement FromBigInteger(BigInteger x)
{
return new SM2P256V1FieldElement(x);
}
protected internal override ECPoint CreateRawPoint(ECFieldElement x, ECFieldElement y, bool withCompression)
{
return new SM2P256V1Point(this, x, y, withCompression);
}
protected internal override ECPoint CreateRawPoint(ECFieldElement x, ECFieldElement y, ECFieldElement[] zs, bool withCompression)
{
return new SM2P256V1Point(this, x, y, zs, withCompression);
}
public override ECLookupTable CreateCacheSafeLookupTable(ECPoint[] points, int off, int len)
{
uint[] table = new uint[len * SM2P256V1_FE_INTS * 2];
{
int pos = 0;
for (int i = 0; i < len; ++i)
{
ECPoint p = points[off + i];
Nat256.Copy(((SM2P256V1FieldElement)p.RawXCoord).x, 0, table, pos); pos += SM2P256V1_FE_INTS;
Nat256.Copy(((SM2P256V1FieldElement)p.RawYCoord).x, 0, table, pos); pos += SM2P256V1_FE_INTS;
}
}
return new SM2P256V1LookupTable(this, table, len);
}
private class SM2P256V1LookupTable
: AbstractECLookupTable
{
private readonly SM2P256V1Curve m_outer;
private readonly uint[] m_table;
private readonly int m_size;
internal SM2P256V1LookupTable(SM2P256V1Curve outer, uint[] table, int size)
{
this.m_outer = outer;
this.m_table = table;
this.m_size = size;
}
public override int Size
{
get { return m_size; }
}
public override ECPoint Lookup(int index)
{
uint[] x = Nat256.Create(), y = Nat256.Create();
int pos = 0;
for (int i = 0; i < m_size; ++i)
{
uint MASK = (uint)(((i ^ index) - 1) >> 31);
for (int j = 0; j < SM2P256V1_FE_INTS; ++j)
{
x[j] ^= m_table[pos + j] & MASK;
y[j] ^= m_table[pos + SM2P256V1_FE_INTS + j] & MASK;
}
pos += (SM2P256V1_FE_INTS * 2);
}
return CreatePoint(x, y);
}
public override ECPoint LookupVar(int index)
{
uint[] x = Nat256.Create(), y = Nat256.Create();
int pos = index * SM2P256V1_FE_INTS * 2;
for (int j = 0; j < SM2P256V1_FE_INTS; ++j)
{
x[j] = m_table[pos + j];
y[j] = m_table[pos + SM2P256V1_FE_INTS + j];
}
return CreatePoint(x, y);
}
private ECPoint CreatePoint(uint[] x, uint[] y)
{
return m_outer.CreateRawPoint(new SM2P256V1FieldElement(x), new SM2P256V1FieldElement(y), SM2P256V1_AFFINE_ZS, false);
}
}
}
}
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