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/*
* Copyright (C) 2012 The Android Open Source Project
*
* 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 org.apache.harmony.xnet.provider.jsse;
import java.io.Serializable;
import java.security.SecureRandomSpi;
import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.IOException;
public class OpenSSLRandom extends SecureRandomSpi implements Serializable {
private static final long serialVersionUID = 8506210602917522860L;
private transient int state;
private static final int UNSEEDED = 0;
private static final int SEEDED = 1;
public OpenSSLRandom() {
state = UNSEEDED;
}
/**
* Generates a invocation-specific seed to be mixed into the
* Linux PRNG.
*/
private void generateSeed() {
try {
ByteArrayOutputStream seedBuffer = new ByteArrayOutputStream();
DataOutputStream seedBufferOut =
new DataOutputStream(seedBuffer);
seedBufferOut.writeLong(System.currentTimeMillis());
seedBufferOut.writeLong(System.nanoTime());
seedBufferOut.close();
NativeCrypto.RAND_seed(seedBuffer.toByteArray());
NativeCrypto.RAND_load_file("/dev/urandom", 1024);
state = SEEDED;
} catch (IOException e) {
throw new SecurityException("Failed to generate seed", e);
}
}
@Override
protected void engineSetSeed(byte[] seed) {
NativeCrypto.RAND_seed(seed);
state = SEEDED;
}
@Override
protected void engineNextBytes(byte[] bytes) {
if (state == UNSEEDED)
generateSeed();
NativeCrypto.RAND_bytes(bytes);
}
@Override
protected byte[] engineGenerateSeed(int numBytes) {
byte[] output = new byte[numBytes];
if (state == UNSEEDED)
generateSeed();
NativeCrypto.RAND_bytes(output);
return output;
}
}
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