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Hedera™ Hashgraph SDK for Java
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/*-
 *
 * Hedera Java SDK
 *
 * Copyright (C) 2020 - 2024 Hedera Hashgraph, 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 com.hedera.hashgraph.sdk;

import com.google.protobuf.InvalidProtocolBufferException;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.sec.SECNamedCurves;
import org.bouncycastle.asn1.x9.X9ECParameters;
import org.bouncycastle.crypto.params.ECDomainParameters;

/**
 * A common base for the signing authority or key that entities in Hedera may have.
 *
 * See Hedera Documentation
 * @see KeyList
 * @see PublicKey
 */
public abstract class Key {
    static final ASN1ObjectIdentifier ID_ED25519 = new ASN1ObjectIdentifier("1.3.101.112");
    static final ASN1ObjectIdentifier ID_ECDSA_SECP256K1 = new ASN1ObjectIdentifier("1.3.132.0.10");
    static final ASN1ObjectIdentifier ID_EC_PUBLIC_KEY = new ASN1ObjectIdentifier("1.2.840.10045.2.1");

    static final X9ECParameters ECDSA_SECP256K1_CURVE = SECNamedCurves.getByName("secp256k1");
    static final ECDomainParameters ECDSA_SECP256K1_DOMAIN =
        new ECDomainParameters(
            ECDSA_SECP256K1_CURVE.getCurve(),
            ECDSA_SECP256K1_CURVE.getG(),
            ECDSA_SECP256K1_CURVE.getN(),
            ECDSA_SECP256K1_CURVE.getH()
        );

    /**
     * Create a specific key type from the protobuf.
     *
     * @param key                       the protobuf key of unknown type
     * @return                          the differentiated key
     */
    static Key fromProtobufKey(com.hedera.hashgraph.sdk.proto.Key key) {
        switch (key.getKeyCase()) {
            case ED25519 -> {
                return new PublicKeyED25519(key.getEd25519().toByteArray());
            }
            case ECDSA_SECP256K1 -> {
                if (key.getECDSASecp256K1().size() == 20) {
                    return new EvmAddress(key.getECDSASecp256K1().toByteArray());
                } else {
                    return new PublicKeyECDSA(key.getECDSASecp256K1().toByteArray());
                }
            }
            case KEYLIST -> {
                return KeyList.fromProtobuf(key.getKeyList(), null);
            }
            case THRESHOLDKEY -> {
                return KeyList.fromProtobuf(key.getThresholdKey().getKeys(), key.getThresholdKey().getThreshold());
            }
            case CONTRACTID -> {
                return ContractId.fromProtobuf(key.getContractID());
            }
            case DELEGATABLE_CONTRACT_ID -> {
                return DelegateContractId.fromProtobuf(key.getDelegatableContractId());
            }
            case KEY_NOT_SET -> {
                return null;
            }
            default -> throw new IllegalStateException("Key#fromProtobuf: unhandled key case: " + key.getKeyCase());
        }
    }

    /**
     * Serialize this key as a protobuf object
     */
    abstract com.hedera.hashgraph.sdk.proto.Key toProtobufKey();

    /**
     * Create the byte array.
     *
     * @return                          the byte array representation
     */
    public byte[] toBytes() {
        return toProtobufKey().toByteArray();
    }

    /**
     * Create Key from proto.Key byte array
     *
     * @param bytes
     * @return Key representation
     * @throws InvalidProtocolBufferException
     */
    public static Key fromBytes(byte[] bytes) throws InvalidProtocolBufferException {
        return fromProtobufKey(com.hedera.hashgraph.sdk.proto.Key.parseFrom(bytes));
    }
}