/**
* EdDSA-Java by str4d * * To the extent possible under law, the person who associated CC0 with * EdDSA-Java has waived all copyright and related or neighboring rights * to EdDSA-Java. * * You should have received a copy of the CC0 legalcode along with this * work. If not, see <https://creativecommons.org/publicdomain/zero/1.0/>. * */
package net.i2p.crypto.eddsa.spec;
import java.security.spec.KeySpec;
import net.i2p.crypto.eddsa.math.GroupElement;
/**
* @author str4d * */
public class EdDSAPublicKeySpec implements KeySpec {
private final GroupElement A; private final GroupElement Aneg; private final EdDSAParameterSpec spec; /** * @param pk the public key * @param spec the parameter specification for this key * @throws IllegalArgumentException if key length is wrong */ public EdDSAPublicKeySpec(byte[] pk, EdDSAParameterSpec spec) { if (pk.length != spec.getCurve().getField().getb()/8) throw new IllegalArgumentException("public-key length is wrong"); this.A = new GroupElement(spec.getCurve(), pk); // Precompute -A for use in verification. this.Aneg = A.negate(); Aneg.precompute(false); this.spec = spec; } public EdDSAPublicKeySpec(GroupElement A, EdDSAParameterSpec spec) { this.A = A; this.Aneg = A.negate(); Aneg.precompute(false); this.spec = spec; } public GroupElement getA() { return A; } public GroupElement getNegativeA() { return Aneg; } public EdDSAParameterSpec getParams() { return spec; }
}