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/**
* 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;
}
}
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