package org.bouncycastle.jce.spec; import java.math.BigInteger; import java.security.spec.AlgorithmParameterSpec; import org.bouncycastle.math.ec.ECCurve; import org.bouncycastle.math.ec.ECPoint; /** * basic domain parameters for an Elliptic Curve public or private key. */ public class ECParameterSpec implements AlgorithmParameterSpec { private ECCurve curve; private byte[] seed; private ECPoint G; private BigInteger n; private BigInteger h; public ECParameterSpec( ECCurve curve, ECPoint G, BigInteger n) { this.curve = curve; this.G = G; this.n = n; this.h = BigInteger.valueOf(1); this.seed = null; } public ECParameterSpec( ECCurve curve, ECPoint G, BigInteger n, BigInteger h) { this.curve = curve; this.G = G; this.n = n; this.h = h; this.seed = null; } public ECParameterSpec( ECCurve curve, ECPoint G, BigInteger n, BigInteger h, byte[] seed) { this.curve = curve; this.G = G; this.n = n; this.h = h; this.seed = seed; } /** * return the curve along which the base point lies. */ public ECCurve getCurve() { return curve; } /** * return the base point we are using for these domain parameters. */ public ECPoint getG() { return G; } /** * return the order N of G */ public BigInteger getN() { return n; } /** * return the cofactor H to the order of G. */ public BigInteger getH() { return h; } /** * return the seed used to generate this curve (if available). */ public byte[] getSeed() { return seed; } }