scuttlebutt/src/main/java/org/apache/tuweni/scuttlebutt/Ed25519PublicKeyIdentity.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE
 * file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file
 * to You 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.apache.tuweni.scuttlebutt;

import org.apache.tuweni.bytes.Bytes;
import org.apache.tuweni.crypto.SECP256K1;
import org.apache.tuweni.crypto.sodium.Signature;

import java.util.Objects;

/**
 * Ed25519 Scuttlebutt identity backed by a public key.
 *
 * This representation doesn't support signing messages.
 */
final class Ed25519PublicKeyIdentity implements Identity {

  private final Signature.PublicKey publicKey;

  Ed25519PublicKeyIdentity(Signature.PublicKey keyPair) {
    this.publicKey = keyPair;
  }

  @Override
  public Bytes sign(Bytes message) {
    throw new UnsupportedOperationException("Cannot sign messages with a public key identity");
  }

  @Override
  public boolean verify(Bytes signature, Bytes message) {
    return Signature.verifyDetached(message, signature, publicKey);
  }

  @Override
  public String publicKeyAsBase64String() {
    return publicKey.bytes().toBase64String();
  }

  @Override
  public Curve curve() {
    return Curve.Ed25519;
  }

  @Override
  public Signature.PublicKey ed25519PublicKey() {
    return publicKey;
  }

  @Override
  public SECP256K1.PublicKey secp256k1PublicKey() {
    throw new UnsupportedOperationException();
  }

  @Override
  public boolean equals(Object o) {
    if (this == o)
      return true;
    if (o == null || getClass() != o.getClass())
      return false;
    Ed25519PublicKeyIdentity identity = (Ed25519PublicKeyIdentity) o;
    return publicKey.equals(identity.publicKey);
  }

  @Override
  public int hashCode() {
    return Objects.hash(publicKey);
  }

  @Override
  public String toString() {
    return toCanonicalForm();
  }
}