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A Java Bitcoin library

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/*
 * Copyright 2014 The bitcoinj authors.
 *
 * 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 org.bitcoinj.wallet;

import org.bitcoinj.core.ECKey;

import javax.annotation.Nullable;

/**
 * A KeyBag is simply an object that can map public keys, their 160-bit hashes and script hashes to ECKey
 * and {@link RedeemData} objects.
 */
public interface KeyBag {
    /**
     * Locates a keypair from the keychain given the hash of the public key. This is needed when finding out which
     * key we need to use to redeem a transaction output.
     *
     * @return ECKey object or null if no such key was found.
     */
    @Nullable
    ECKey findKeyFromPubHash(byte[] pubkeyHash);

    /**
     * Locates a keypair from the keychain given the raw public key bytes.
     *
     * @return ECKey or null if no such key was found.
     */
    @Nullable
    ECKey findKeyFromPubKey(byte[] pubkey);

    /**
     * Locates a redeem data (redeem script and keys) from the keychain given the hash of the script.
     * This is needed when finding out which key and script we need to use to locally sign a P2SH transaction input.
     * It is assumed that wallet should not have more than one private key for a single P2SH tx for security reasons.
     *
     * Returns RedeemData object or null if no such data was found.
     */
    @Nullable
    RedeemData findRedeemDataFromScriptHash(byte[] scriptHash);

}