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/*-
* ============LICENSE_START=======================================================
* ECOMP-PDP
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.openecomp.policy.pdp.test.custom;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.util.List;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import com.att.research.xacml.api.DataType;
import com.att.research.xacml.api.DataTypeException;
import com.att.research.xacml.api.Identifier;
import com.att.research.xacml.api.XACML3;
import com.att.research.xacml.std.IdentifierImpl;
import com.att.research.xacml.std.StdStatus;
import com.att.research.xacml.std.StdStatusCode;
import com.att.research.xacml.std.datatypes.DataTypeHexBinary;
import com.att.research.xacml.std.datatypes.DataTypeString;
import com.att.research.xacml.std.datatypes.HexBinary;
import com.att.research.xacmlatt.pdp.eval.EvaluationContext;
import com.att.research.xacmlatt.pdp.policy.ExpressionResult;
import com.att.research.xacmlatt.pdp.policy.FunctionArgument;
import com.att.research.xacmlatt.pdp.policy.FunctionDefinition;
import com.att.research.xacmlatt.pdp.std.functions.ConvertedArgument;
public class FunctionDefinitionDecrypt implements FunctionDefinition {
public static final Identifier FD_RSA_DECRYPT = new IdentifierImpl("urn:com:att:research:xacml:custom:function:3.0:rsa:decrypt");
private static final FunctionDefinitionDecrypt singleInstance = new FunctionDefinitionDecrypt();
public static FunctionDefinitionDecrypt newInstance() {
return singleInstance;
}
@Override
public Identifier getId() {
return FD_RSA_DECRYPT;
}
@Override
public Identifier getDataTypeId() {
return XACML3.ID_DATATYPE_STRING;
}
@Override
public boolean returnsBag() {
return false;
}
@Override
public ExpressionResult evaluate(EvaluationContext evaluationContext, List<FunctionArgument> arguments) {
if (arguments == null || arguments.size() < 2) {
return ExpressionResult.newError(new StdStatus(StdStatusCode.STATUS_CODE_PROCESSING_ERROR, "Decrypt failed, expecting 2 arguments."));
}
//
// What is the first argument?
//
FunctionArgument arg0 = arguments.get(0);
if (arg0.isBag()) {
//
// We don't support bags right now
//
return ExpressionResult.newError(new StdStatus(StdStatusCode.STATUS_CODE_PROCESSING_ERROR, "Decrypt failed, not expecting a bag for argument 0."));
}
if (arg0.getValue().getDataTypeId().equals(XACML3.ID_DATATYPE_HEXBINARY) == false) {
//
// Should be a String
//
return ExpressionResult.newError(new StdStatus(StdStatusCode.STATUS_CODE_PROCESSING_ERROR, "Decrypt failed, expected a Hex Binary for argument 0."));
}
//
// Convert the argument
//
ConvertedArgument<HexBinary> data = new ConvertedArgument<HexBinary>(arg0, DataTypeHexBinary.newInstance(), false);
if (! data.isOk()) {
return ExpressionResult.newError(new StdStatus(StdStatusCode.STATUS_CODE_PROCESSING_ERROR, "Decrypt failed, argument 0 failed to convert to Hex Binary."));
}
//
// Ok - check the 2nd argument
//
FunctionArgument arg1 = arguments.get(1);
if (arg1.isBag()) {
//
// We don't support bags right now
//
return ExpressionResult.newError(new StdStatus(StdStatusCode.STATUS_CODE_PROCESSING_ERROR, "Decrypt failed, not expecting a bag for argument 1."));
}
if (arg1.getValue().getDataTypeId().equals(DataTypePrivateKey.DT_PRIVATEKEY) ||
arg1.getValue().getDataTypeId().equals(DataTypePublicKey.DT_PUBLICKEY)) {
//
// Ok - let's try to decrypt
//
Cipher cipher;
try {
cipher = Cipher.getInstance("RSA");
if (arg1.getValue().getDataTypeId().equals(DataTypePrivateKey.DT_PRIVATEKEY)) {
//
// Using the private key
//
DataType<PrivateKey> pkDatatype = DataTypePrivateKey.newInstance();
ConvertedArgument<PrivateKey> privateKey = new ConvertedArgument<PrivateKey>(arg1, pkDatatype, false);
if ( ! privateKey.isOk()) {
return ExpressionResult.newError(new StdStatus(privateKey.getStatus().getStatusCode(), "Decrypt: " + privateKey.getStatus().getStatusMessage()));
}
//
// Setup decryption
//
cipher.init(Cipher.DECRYPT_MODE, privateKey.getValue());
} else if (arg1.getValue().getDataTypeId().equals(DataTypePublicKey.DT_PUBLICKEY)) {
//
// Using the private key
//
DataType<PublicKey> pkDatatype = DataTypePublicKey.newInstance();
ConvertedArgument<PublicKey> publicKey = new ConvertedArgument<PublicKey>(arg1, pkDatatype, false);
if ( ! publicKey.isOk()) {
return ExpressionResult.newError(new StdStatus(publicKey.getStatus().getStatusCode(), "Decrypt: " + publicKey.getStatus().getStatusMessage()));
}
//
// Setup decryption
//
cipher.init(Cipher.DECRYPT_MODE, publicKey.getValue());
}
//
// Do the decryption
//
byte[] decryptedData = cipher.doFinal(data.getValue().getData());
String decryptedString = new String(decryptedData);
//
// All good, return the decrypted string
//
return ExpressionResult.newSingle(DataTypeString.newInstance().createAttributeValue(decryptedString));
} catch (NoSuchAlgorithmException | NoSuchPaddingException | InvalidKeyException | IllegalBlockSizeException | BadPaddingException | DataTypeException e) {
return ExpressionResult.newError(new StdStatus(StdStatusCode.STATUS_CODE_PROCESSING_ERROR, "Decrypt failed: " + e.getLocalizedMessage()));
}
}
return ExpressionResult.newError(new StdStatus(StdStatusCode.STATUS_CODE_PROCESSING_ERROR, "Decrypt failed, expecting public/private key datatype for argument 1."));
}
}
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