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/*
 * Copyright 2013 Jim Burton.
 *
 * Licensed under the MIT license (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://opensource.org/licenses/mit-license.php
 *
 * 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 org.bitcoinj.crypto;

import com.google.common.base.Objects;
import java.util.Arrays;

/**
 * An instance of EncryptedData is a holder for an initialization vector and encrypted bytes. It is typically
 * used to hold encrypted private key bytes.
 *
 * The initialisation vector is random data that is used to initialise the AES block cipher when the
 * private key bytes were encrypted. You need these for decryption.
 */
public final class EncryptedData {
    public final byte[] initialisationVector;
    public final byte[] encryptedBytes;

    public EncryptedData(byte[] initialisationVector, byte[] encryptedBytes) {
        this.initialisationVector = Arrays.copyOf(initialisationVector, initialisationVector.length);
        this.encryptedBytes = Arrays.copyOf(encryptedBytes, encryptedBytes.length);
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        EncryptedData other = (EncryptedData) o;
        return Arrays.equals(encryptedBytes, other.encryptedBytes) && Arrays.equals(initialisationVector, other.initialisationVector);
    }

    @Override
    public int hashCode() {
        return Objects.hashCode(Arrays.hashCode(encryptedBytes), Arrays.hashCode(initialisationVector));
    }

    @Override
    public String toString() {
        return "EncryptedData [initialisationVector=" + Arrays.toString(initialisationVector)
            + ", encryptedPrivateKey=" + Arrays.toString(encryptedBytes) + "]";
    }
}