import net.i2p.crypto.eddsa.spec.EdDSANamedCurveSpec; //导入依赖的package包/类
/**
 * Helper method to construct an instance of {@link KeyPair} containing keys for testing purposes.
 *
 * @return An instance of {@link KeyPair}.
 */
protected KeyPair constructEd25519KeyPair() throws InvalidKeySpecException {
  final EdDSANamedCurveSpec edParams = EdDSANamedCurveTable
      .getByName(CryptoConditionReader.ED_25519);
  assert (edParams != null);

  final EdDSAPublicKeySpec pubKeySpec = new EdDSAPublicKeySpec(TEST_PUBKEY, edParams);
  final PublicKey pubKey = new EdDSAPublicKey(pubKeySpec);

  final EdDSAPrivateKeySpec privateKeySpec = new EdDSAPrivateKeySpec(TEST_PRIVKEY, edParams);
  final PrivateKey privKey = new EdDSAPrivateKey(privateKeySpec);

  return new KeyPair(pubKey, privKey);
}
 

import net.i2p.crypto.eddsa.spec.EdDSANamedCurveSpec; //导入依赖的package包/类
/**
 * Create an EdDSANamedCurveSpec from the provided curve name. The current
 * implementation fetches the pre-created curve spec from a table.
 * @param curveName the EdDSA named curve.
 * @return the specification for the named curve.
 * @throws InvalidAlgorithmParameterException if the named curve is unknown.
 */
protected EdDSANamedCurveSpec createNamedCurveSpec(String curveName) throws InvalidAlgorithmParameterException {
    EdDSANamedCurveSpec spec = EdDSANamedCurveTable.getByName(curveName);
    if (spec == null) {
        throw new InvalidAlgorithmParameterException("unknown curve name: " + curveName);
    }
    return spec;
}
 

import net.i2p.crypto.eddsa.spec.EdDSANamedCurveSpec; //导入依赖的package包/类
public boolean isValidSignature(byte[] message, byte[] signature, byte[] publicKey) {
    try {
        EdDSANamedCurveSpec spec = EdDSANamedCurveTable.getByName("ed25519-sha-512");

        EdDSAPublicKeySpec edDSAPublicKeySpec = new EdDSAPublicKeySpec(publicKey, spec);
        EdDSAPublicKey edDSAPublicKey = new EdDSAPublicKey(edDSAPublicKeySpec);

        mEdDSAEngine.initVerify(edDSAPublicKey);
        mEdDSAEngine.update(message);

        return mEdDSAEngine.verify(signature);
    } catch (Exception e) {
        throw new IllegalArgumentException(e);
    }
}