io.grpc.alts.internal.FakeChannelCrypter.java Source code

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Here is the source code for io.grpc.alts.internal.FakeChannelCrypter.java

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/*
 * Copyright 2018 The gRPC Authors
 *
 * 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 io.grpc.alts.internal;

import static com.google.common.base.Preconditions.checkState;

import io.netty.buffer.ByteBuf;
import java.security.GeneralSecurityException;
import java.util.Collections;
import java.util.List;
import javax.crypto.AEADBadTagException;

public final class FakeChannelCrypter implements ChannelCrypterNetty {
    private static final int TAG_BYTES = 16;
    private static final byte TAG_BYTE = (byte) 0xa1;

    private boolean destroyCalled = false;

    public static int getTagBytes() {
        return TAG_BYTES;
    }

    @Override
    public void encrypt(ByteBuf out, List<ByteBuf> plain) throws GeneralSecurityException {
        checkState(!destroyCalled);
        for (ByteBuf buf : plain) {
            out.writeBytes(buf);
            for (int i = 0; i < TAG_BYTES; ++i) {
                out.writeByte(TAG_BYTE);
            }
        }
    }

    @Override
    public void decrypt(ByteBuf out, ByteBuf tag, List<ByteBuf> ciphertext) throws GeneralSecurityException {
        checkState(!destroyCalled);
        for (ByteBuf buf : ciphertext) {
            out.writeBytes(buf);
        }
        while (tag.isReadable()) {
            if (tag.readByte() != TAG_BYTE) {
                throw new AEADBadTagException("Tag mismatch!");
            }
        }
    }

    @Override
    public void decrypt(ByteBuf out, ByteBuf ciphertextAndTag) throws GeneralSecurityException {
        checkState(!destroyCalled);
        ByteBuf ciphertext = ciphertextAndTag.readSlice(ciphertextAndTag.readableBytes() - TAG_BYTES);
        decrypt(out, /*tag=*/ ciphertextAndTag, Collections.singletonList(ciphertext));
    }

    @Override
    public int getSuffixLength() {
        return TAG_BYTES;
    }

    @Override
    public void destroy() {
        destroyCalled = true;
    }
}