| 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.ec.ECFieldElement; |
| import org.bouncycastle.math.ec.ECLookupTable; |
| import org.bouncycastle.math.ec.ECMultiplier; |
| import org.bouncycastle.math.ec.ECPoint; |
| import org.bouncycastle.math.ec.WTauNafMultiplier; |
| import org.bouncycastle.math.raw.Nat256; |
| import org.bouncycastle.util.encoders.Hex; |
| |
| public class SecT233K1Curve extends AbstractF2m |
| { |
| private static final int SecT233K1_DEFAULT_COORDS = COORD_LAMBDA_PROJECTIVE; |
| |
| protected SecT233K1Point infinity; |
| |
| public SecT233K1Curve() |
| { |
| super(233, 74, 0, 0); |
| |
| this.infinity = new SecT233K1Point(this, null, null); |
| |
| this.a = fromBigInteger(BigInteger.valueOf(0)); |
| this.b = fromBigInteger(BigInteger.valueOf(1)); |
| this.order = new BigInteger(1, Hex.decode("8000000000000000000000000000069D5BB915BCD46EFB1AD5F173ABDF")); |
| this.cofactor = BigInteger.valueOf(4); |
| |
| this.coord = SecT233K1_DEFAULT_COORDS; |
| } |
| |
| protected ECCurve cloneCurve() |
| { |
| return new SecT233K1Curve(); |
| } |
| |
| public boolean supportsCoordinateSystem(int coord) |
| { |
| switch (coord) |
| { |
| case COORD_LAMBDA_PROJECTIVE: |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| protected ECMultiplier createDefaultMultiplier() |
| { |
| return new WTauNafMultiplier(); |
| } |
| |
| public int getFieldSize() |
| { |
| return 233; |
| } |
| |
| public ECFieldElement fromBigInteger(BigInteger x) |
| { |
| return new SecT233FieldElement(x); |
| } |
| |
| protected ECPoint createRawPoint(ECFieldElement x, ECFieldElement y, boolean withCompression) |
| { |
| return new SecT233K1Point(this, x, y, withCompression); |
| } |
| |
| protected ECPoint createRawPoint(ECFieldElement x, ECFieldElement y, ECFieldElement[] zs, boolean withCompression) |
| { |
| return new SecT233K1Point(this, x, y, zs, withCompression); |
| } |
| |
| public ECPoint getInfinity() |
| { |
| return infinity; |
| } |
| |
| public boolean isKoblitz() |
| { |
| return true; |
| } |
| |
| public int getM() |
| { |
| return 233; |
| } |
| |
| public boolean isTrinomial() |
| { |
| return true; |
| } |
| |
| public int getK1() |
| { |
| return 74; |
| } |
| |
| public int getK2() |
| { |
| return 0; |
| } |
| |
| public int getK3() |
| { |
| return 0; |
| } |
| |
| public ECLookupTable createCacheSafeLookupTable(ECPoint[] points, int off, final int len) |
| { |
| final int FE_LONGS = 4; |
| |
| final long[] table = new long[len * FE_LONGS * 2]; |
| { |
| int pos = 0; |
| for (int i = 0; i < len; ++i) |
| { |
| ECPoint p = points[off + i]; |
| Nat256.copy64(((SecT233FieldElement)p.getRawXCoord()).x, 0, table, pos); pos += FE_LONGS; |
| Nat256.copy64(((SecT233FieldElement)p.getRawYCoord()).x, 0, table, pos); pos += FE_LONGS; |
| } |
| } |
| |
| return new ECLookupTable() |
| { |
| public int getSize() |
| { |
| return len; |
| } |
| |
| public ECPoint lookup(int index) |
| { |
| long[] x = Nat256.create64(), y = Nat256.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 SecT233FieldElement(x), new SecT233FieldElement(y), false); |
| } |
| }; |
| } |
| } |