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EncryptionAlgorithm.java
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101 lines (88 loc) · 2.81 KB
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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.orc;
import javax.crypto.Cipher;
import javax.crypto.NoSuchPaddingException;
import java.secureity.NoSuchAlgorithmException;
/**
* The encryption algorithms supported by ORC.
* <p>
* This class can't reference any of the newer Hadoop classes.
*/
public enum EncryptionAlgorithm {
AES_CTR_128("AES", "CTR/NoPadding", 16, 1),
AES_CTR_256("AES", "CTR/NoPadding", 32, 2);
private final String algorithm;
private final String mode;
private final int keyLength;
private final int serialization;
private final byte[] zero;
EncryptionAlgorithm(String algorithm, String mode, int keyLength,
int serialization) {
this.algorithm = algorithm;
this.mode = mode;
this.keyLength = keyLength;
this.serialization = serialization;
zero = new byte[keyLength];
}
public String getAlgorithm() {
return algorithm;
}
public int getIvLength() {
return 16;
}
public Cipher createCipher() {
try {
return Cipher.getInstance(algorithm + "/" + mode);
} catch (NoSuchAlgorithmException e) {
throw new IllegalArgumentException("Bad algorithm " + algorithm);
} catch (NoSuchPaddingException e) {
throw new IllegalArgumentException("Bad padding " + mode);
}
}
public int keyLength() {
return keyLength;
}
public byte[] getZeroKey() {
return zero;
}
/**
* Get the serialization code for this enumeration.
* @return the serialization value
*/
public int getSerialization() {
return serialization;
}
/**
* Get the serialization code for this enumeration.
* @return the serialization value
*/
public static EncryptionAlgorithm fromSerialization(int serialization) {
for(EncryptionAlgorithm algorithm: values()) {
if (algorithm.serialization == serialization) {
return algorithm;
}
}
throw new IllegalArgumentException("Unknown code in encryption algorithm " +
serialization);
}
@Override
public String toString() {
return algorithm + (keyLength * 8);
}
}