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/*
* Copyright (C) 2022 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.conscrypt;
import java.io.UnsupportedEncodingException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.security.InvalidKeyException;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.KeySpec;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactorySpi;
@Internal
public class ScryptSecretKeyFactory extends SecretKeyFactorySpi {
@Override
protected SecretKey engineGenerateSecret(KeySpec inKeySpec) throws InvalidKeySpecException {
char[] password;
byte[] salt;
int n, r, p, keyOutputBits;
if (inKeySpec instanceof ScryptKeySpec) {
ScryptKeySpec spec = (ScryptKeySpec) inKeySpec;
password = spec.getPassword();
salt = spec.getSalt();
n = spec.getCostParameter();
r = spec.getBlockSize();
p = spec.getParallelizationParameter();
keyOutputBits = spec.getKeyLength();
} else {
// Extract parameters from any `KeySpec` that has getters with the correct name. This
// allows, for example, code to use BouncyCastle's KeySpec with the Conscrypt provider.
try {
password = (char[]) getValue(inKeySpec, "getPassword");
salt = (byte[]) getValue(inKeySpec, "getSalt");
n = (int) getValue(inKeySpec, "getCostParameter");
r = (int) getValue(inKeySpec, "getBlockSize");
p = (int) getValue(inKeySpec, "getParallelizationParameter");
keyOutputBits = (int) getValue(inKeySpec, "getKeyLength");
} catch (Exception e) {
throw new InvalidKeySpecException("Not a valid scrypt KeySpec", e);
}
}
if (keyOutputBits % 8 != 0) {
throw new InvalidKeySpecException("Cannot produce fractional-byte outputs");
}
try {
return new ScryptKey(
NativeCrypto.Scrypt_generate_key(
new String(password).getBytes("UTF-8"),
salt, n, r, p, keyOutputBits / 8));
} catch (UnsupportedEncodingException e) {
// Impossible according to the Java docs: UTF-8 is always supported.
throw new IllegalStateException(e);
}
}
private Object getValue(KeySpec spec, String methodName)
throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
Method method = spec.getClass().getMethod(methodName, (Class<?>[]) null);
return method.invoke(spec);
}
@Override
protected KeySpec engineGetKeySpec(
SecretKey secretKey, @SuppressWarnings("rawtypes") Class aClass)
throws InvalidKeySpecException {
if (secretKey == null) {
throw new InvalidKeySpecException("Null KeySpec");
}
throw new NotImplementedException();
}
@Override
protected SecretKey engineTranslateKey(SecretKey secretKey) throws InvalidKeyException {
if (secretKey == null) {
throw new InvalidKeyException("Null SecretKey");
}
throw new NotImplementedException();
}
private static class ScryptKey implements SecretKey {
private static final long serialVersionUID = 2024924811854189128L;
private final byte[] key;
public ScryptKey(byte[] key) {
this.key = key;
}
@Override
public String getAlgorithm() {
// Capitalised because BouncyCastle does it.
return "SCRYPT";
}
@Override
public String getFormat() {
return "RAW";
}
@Override
public byte[] getEncoded() {
return key;
}
}
private static class NotImplementedException extends RuntimeException {
NotImplementedException() {
super("Not implemented");
}
}
}
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