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* 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
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*
* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
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package org.apache.cayenne.crypto.unit;
import org.apache.cayenne.configuration.server.ServerRuntime;
import org.apache.cayenne.crypto.key.KeySource;
import org.apache.cayenne.crypto.transformer.bytes.Header;
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.math.BigInteger;
import java.nio.ByteBuffer;
import java.security.Key;
import java.util.Arrays;
import java.util.Random;
import java.util.zip.GZIPInputStream;
public class CryptoUnitUtils {
public static byte[] bytesOfSize(int len) {
Random r = new Random();
byte[] b = new byte[len];
r.nextBytes(b);
return b;
}
public static byte[] hexToBytes(String hexString) {
byte[] bytes = new BigInteger(hexString, 16).toByteArray();
// http://stackoverflow.com/questions/4407779/biginteger-to-byte
if (bytes.length > 0 && bytes[0] == 0) {
return Arrays.copyOfRange(bytes, 1, bytes.length);
} else {
return bytes;
}
}
public static byte[] gunzip(byte[] source) {
ByteArrayOutputStream out = new ByteArrayOutputStream();
try {
GZIPInputStream gunzip = new GZIPInputStream(new ByteArrayInputStream(source));
int read;
byte[] buffer = new byte[1024];
while ((read = gunzip.read(buffer)) > 0) {
out.write(buffer, 0, read);
}
} catch (IOException e) {
throw new RuntimeException(e);
}
return out.toByteArray();
}
public static byte[] decrypt_AES_CBC(byte[] source, ServerRuntime runtime) {
try {
Cipher decCipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
Header header = Header.create(source, 0);
int offset = header.size();
if(header.haveHMAC()) {
byte hmacLength = source[offset];
offset += hmacLength + 1;
}
int blockSize = decCipher.getBlockSize();
byte[] ivBytes = Arrays.copyOfRange(source, offset, offset + blockSize);
byte[] cipherText = Arrays.copyOfRange(source, offset + blockSize, source.length);
Key key = runtime.getInjector().getInstance(KeySource.class).getKey(header.getKeyName());
decCipher.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(ivBytes));
return decCipher.doFinal(cipherText);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public static byte[] toByteArray(int integer) {
if (integer <= Short.MAX_VALUE) {
return toByteArray((short) integer);
}
return ByteBuffer.allocate(4).putInt(integer).array();
}
public static byte[] toByteArray(short shortInt) {
if (shortInt <= Byte.MAX_VALUE) {
return toByteArray((byte) shortInt);
}
return ByteBuffer.allocate(2).putShort(shortInt).array();
}
public static byte[] toByteArray(byte byteInt) {
return new byte[]{byteInt};
}
}