org.apache.accumulo.core.crypto.CryptoUtils.java Source code

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Here is the source code for org.apache.accumulo.core.crypto.CryptoUtils.java

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/*
 * 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.accumulo.core.crypto;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.SecureRandom;
import java.util.Objects;

import org.apache.accumulo.core.spi.crypto.CryptoService.CryptoException;
import org.apache.commons.io.IOUtils;

public class CryptoUtils {

    public static SecureRandom newSha1SecureRandom() {
        return newSecureRandom("SHA1PRNG", "SUN");
    }

    private static SecureRandom newSecureRandom(String secureRNG, String secureRNGProvider) {
        SecureRandom secureRandom = null;
        try {
            secureRandom = SecureRandom.getInstance(secureRNG, secureRNGProvider);

            // Immediately seed the generator
            byte[] throwAway = new byte[16];
            secureRandom.nextBytes(throwAway);
        } catch (NoSuchAlgorithmException | NoSuchProviderException e) {
            throw new CryptoException("Unable to generate secure random.", e);
        }
        return secureRandom;
    }

    /**
     * Read the decryption parameters from the DataInputStream
     */
    public static byte[] readParams(DataInputStream in) throws IOException {
        Objects.requireNonNull(in);
        int len = in.readInt();
        byte[] decryptionParams = new byte[len];
        IOUtils.readFully(in, decryptionParams);
        return decryptionParams;
    }

    /**
     * Write the decryption parameters to the DataOutputStream
     */
    public static void writeParams(byte[] decryptionParams, DataOutputStream out) throws IOException {
        Objects.requireNonNull(decryptionParams);
        Objects.requireNonNull(out);
        out.writeInt(decryptionParams.length);
        out.write(decryptionParams);
    }

}