com.github.horrorho.inflatabledonkey.data.der.ECDSASignature.java Source code

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Here is the source code for com.github.horrorho.inflatabledonkey.data.der.ECDSASignature.java

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/*
 * The MIT License
 *
 * Copyright 2016 Ahseya.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package com.github.horrorho.inflatabledonkey.data.der;

import java.math.BigInteger;
import java.util.Objects;
import net.jcip.annotations.Immutable;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.DERSequence;

/**
 * ECDSA signature.
 * <p>
 * ECDSASignature ::= SEQUENCE { r INTEGER, s INTEGER }
 *
 * @author Ahseya
 */
@Immutable
public final class ECDSASignature extends ASN1Object {

    private final BigInteger r;
    private final BigInteger s;

    public ECDSASignature(BigInteger r, BigInteger s) {
        this.r = Objects.requireNonNull(r);
        this.s = Objects.requireNonNull(s);
    }

    public ECDSASignature(ASN1Primitive primitive) {
        DERIterator i = DER.asSequence(primitive);

        r = DER.as(ASN1Integer.class, i).getValue();

        s = DER.as(ASN1Integer.class, i).getValue();
    }

    public BigInteger r() {
        return r;
    }

    public BigInteger s() {
        return s;
    }

    @Override
    public ASN1Primitive toASN1Primitive() {
        ASN1EncodableVector vector = DER.vector(new ASN1Integer(r), new ASN1Integer(s));

        return new DERSequence(vector);
    }

    @Override
    public String toString() {
        return "Signature{" + "r=0x" + r.toString(16) + ", s=0x" + s.toString(16) + '}';
    }
}