| // 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. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| // |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| package com.google.crypto.tink.subtle; |
| |
| import java.nio.ByteBuffer; |
| import java.security.GeneralSecurityException; |
| |
| /** |
| * StreamSegmentDecrypter is a helper class that decrypts individual segments of a stream. |
| * |
| * <p>Instances of this interfaces are passed to {@link StreamingAeadDecryptingChannel}. Each |
| * instance must be initialized with the header of the ciphertext. |
| * |
| * @since 1.1.0 |
| */ |
| public interface StreamSegmentDecrypter { |
| void init(ByteBuffer header, byte[] aad) throws GeneralSecurityException; |
| |
| /** |
| * Decrypts a ciphetext segment. |
| * |
| * @param segmentNr the number of the segment |
| * @param isLastSegment true if this segment is the last segment of the ciphertext stream. The |
| * last segment is encrypted (or authenticated) differently to detect truncated ciphertext. |
| * @param plaintext the decrypted plaintext. |
| * @throws GeneralSecurityException if ciphertext was not a valid ciphertext for the given |
| * segment. |
| */ |
| void decryptSegment( |
| ByteBuffer ciphertext, int segmentNr, boolean isLastSegment, ByteBuffer plaintext) |
| throws GeneralSecurityException; |
| } |