| package org.bouncycastle.math.ec.custom.sec; |
| |
| import java.math.BigInteger; |
| |
| import org.bouncycastle.math.ec.ECCurve; |
| import org.bouncycastle.math.ec.ECCurve.AbstractF2m; |
| import org.bouncycastle.math.raw.Nat448; |
| import org.bouncycastle.math.ec.ECFieldElement; |
| import org.bouncycastle.math.ec.ECLookupTable; |
| import org.bouncycastle.math.ec.ECPoint; |
| import org.bouncycastle.util.encoders.Hex; |
| |
| public class SecT409R1Curve extends AbstractF2m |
| { |
| private static final int SecT409R1_DEFAULT_COORDS = COORD_LAMBDA_PROJECTIVE; |
| |
| protected SecT409R1Point infinity; |
| |
| public SecT409R1Curve() |
| { |
| super(409, 87, 0, 0); |
| |
| this.infinity = new SecT409R1Point(this, null, null); |
| |
| this.a = fromBigInteger(BigInteger.valueOf(1)); |
| this.b = fromBigInteger(new BigInteger(1, Hex.decode("0021A5C2C8EE9FEB5C4B9A753B7B476B7FD6422EF1F3DD674761FA99D6AC27C8A9A197B272822F6CD57A55AA4F50AE317B13545F"))); |
| this.order = new BigInteger(1, Hex.decode("010000000000000000000000000000000000000000000000000001E2AAD6A612F33307BE5FA47C3C9E052F838164CD37D9A21173")); |
| this.cofactor = BigInteger.valueOf(2); |
| |
| this.coord = SecT409R1_DEFAULT_COORDS; |
| } |
| |
| protected ECCurve cloneCurve() |
| { |
| return new SecT409R1Curve(); |
| } |
| |
| public boolean supportsCoordinateSystem(int coord) |
| { |
| switch (coord) |
| { |
| case COORD_LAMBDA_PROJECTIVE: |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| public int getFieldSize() |
| { |
| return 409; |
| } |
| |
| public ECFieldElement fromBigInteger(BigInteger x) |
| { |
| return new SecT409FieldElement(x); |
| } |
| |
| protected ECPoint createRawPoint(ECFieldElement x, ECFieldElement y, boolean withCompression) |
| { |
| return new SecT409R1Point(this, x, y, withCompression); |
| } |
| |
| protected ECPoint createRawPoint(ECFieldElement x, ECFieldElement y, ECFieldElement[] zs, boolean withCompression) |
| { |
| return new SecT409R1Point(this, x, y, zs, withCompression); |
| } |
| |
| public ECPoint getInfinity() |
| { |
| return infinity; |
| } |
| |
| public boolean isKoblitz() |
| { |
| return false; |
| } |
| |
| public int getM() |
| { |
| return 409; |
| } |
| |
| public boolean isTrinomial() |
| { |
| return true; |
| } |
| |
| public int getK1() |
| { |
| return 87; |
| } |
| |
| public int getK2() |
| { |
| return 0; |
| } |
| |
| public int getK3() |
| { |
| return 0; |
| } |
| |
| public ECLookupTable createCacheSafeLookupTable(ECPoint[] points, int off, final int len) |
| { |
| final int FE_LONGS = 7; |
| |
| final long[] table = new long[len * FE_LONGS * 2]; |
| { |
| int pos = 0; |
| for (int i = 0; i < len; ++i) |
| { |
| ECPoint p = points[off + i]; |
| Nat448.copy64(((SecT409FieldElement)p.getRawXCoord()).x, 0, table, pos); pos += FE_LONGS; |
| Nat448.copy64(((SecT409FieldElement)p.getRawYCoord()).x, 0, table, pos); pos += FE_LONGS; |
| } |
| } |
| |
| return new ECLookupTable() |
| { |
| public int getSize() |
| { |
| return len; |
| } |
| |
| public ECPoint lookup(int index) |
| { |
| long[] x = Nat448.create64(), y = Nat448.create64(); |
| int pos = 0; |
| |
| for (int i = 0; i < len; ++i) |
| { |
| long MASK = ((i ^ index) - 1) >> 31; |
| |
| for (int j = 0; j < FE_LONGS; ++j) |
| { |
| x[j] ^= table[pos + j] & MASK; |
| y[j] ^= table[pos + FE_LONGS + j] & MASK; |
| } |
| |
| pos += (FE_LONGS * 2); |
| } |
| |
| return createRawPoint(new SecT409FieldElement(x), new SecT409FieldElement(y), false); |
| } |
| }; |
| } |
| } |