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/*
 * Copyright 2021 dorkbox, llc
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package dorkbox.serializers.bouncycastle;

import java.math.BigInteger;

import org.bouncycastle.crypto.params.RSAKeyParameters;

import com.esotericsoftware.kryo.Kryo;
import com.esotericsoftware.kryo.Serializer;
import com.esotericsoftware.kryo.io.Input;
import com.esotericsoftware.kryo.io.Output;

/**
 * Only public keys are ever sent across the wire.
 */
public
class RsaPublicKeySerializer extends Serializer {

    @Override
    public
    void write(Kryo kryo, Output output, RSAKeyParameters key) {
        byte[] bytes;
        int length;

        ///////////
        bytes = key.getModulus()
                   .toByteArray();
        length = bytes.length;

        output.writeInt(length, true);
        output.writeBytes(bytes, 0, length);

        /////////////
        bytes = key.getExponent()
                   .toByteArray();
        length = bytes.length;

        output.writeInt(length, true);
        output.writeBytes(bytes, 0, length);
    }

    @SuppressWarnings("rawtypes")
    @Override
    public
    RSAKeyParameters read(Kryo kryo, Input input, Class type) {
        byte[] bytes;
        int length;

        /////////////
        length = input.readInt(true);
        bytes = new byte[length];
        input.readBytes(bytes, 0, length);
        BigInteger modulus = new BigInteger(bytes);

        /////////////
        length = input.readInt(true);
        bytes = new byte[length];
        input.readBytes(bytes, 0, length);
        BigInteger exponent = new BigInteger(bytes);

        return new RSAKeyParameters(false, modulus, exponent);
    }
}