http://github.com/google/tink: Tink is a small cryptographic library that provides a safe, simple, agile and fast way to accomplish some common cryptographic tasks. 
// Copyright 2017 Google Inc.
//
// 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.
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////////////////////////////////////////////////////////////////////////////////

package com.google.crypto.tink;

import java.security.GeneralSecurityException;


Interface for public key signing.

Digital Signatures provide functionality of signing data and verification of the signatures.

Security guarantees


The functionality of Digital Signatures is represented a pair of primitives (interfaces) PublicKeySign for signing of data, and PublicKeyVerify for verification of signatures. Implementations of these interfaces are secure against adaptive chosen-message attacks. Signing data ensures the authenticity and the integrity of that data, but not its secrecy. 
Since:1.0.0
/**
 * Interface for public key signing.
 *
 * <p>Digital Signatures provide functionality of signing data and verification of the signatures.
 *
 * <h3>Security guarantees</h3>
 *
 * <p>The functionality of Digital Signatures is represented a pair of primitives (interfaces)
 * {@link PublicKeySign} for signing of data, and {@link PublicKeyVerify} for verification of
 * signatures. Implementations of these interfaces are secure against adaptive chosen-message
 * attacks. Signing data ensures the authenticity and the integrity of that data, but not its
 * secrecy.
 *
 * @since 1.0.0
 */
public interface PublicKeyVerify {
  
Verifies whether signature is a valid signature for data. 
Throws:
/**
   * Verifies whether {@code signature} is a valid signature for {@code data}.
   *
   * @throws GeneralSecurityException if {@code signature} is not a valid signature for {@code data}
   */
  void verify(final byte[] signature, final byte[] data) throws GeneralSecurityException;
}