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      1 /*
      2  * Copyright (C) 2012 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package org.apache.harmony.xnet.provider.jsse;
     18 
     19 import java.security.InvalidAlgorithmParameterException;
     20 import java.security.InvalidParameterException;
     21 import java.security.KeyPair;
     22 import java.security.KeyPairGenerator;
     23 import java.security.SecureRandom;
     24 import java.security.spec.AlgorithmParameterSpec;
     25 import java.security.spec.ECGenParameterSpec;
     26 import java.security.spec.ECParameterSpec;
     27 import java.util.HashMap;
     28 import java.util.Map;
     29 
     30 public final class OpenSSLECKeyPairGenerator extends KeyPairGenerator {
     31     private static final String ALGORITHM = "EC";
     32 
     33     private static final int DEFAULT_KEY_SIZE = 192;
     34 
     35     private static final Map<Integer, String> SIZE_TO_CURVE_NAME = new HashMap<Integer, String>();
     36 
     37     static {
     38         /* NIST curves */
     39         SIZE_TO_CURVE_NAME.put(192, "prime192v1");
     40         SIZE_TO_CURVE_NAME.put(224, "secp224r1");
     41         SIZE_TO_CURVE_NAME.put(256, "prime256v1");
     42         SIZE_TO_CURVE_NAME.put(384, "secp384r1");
     43         SIZE_TO_CURVE_NAME.put(521, "secp521r1");
     44     }
     45 
     46     private OpenSSLECGroupContext group;
     47 
     48     public OpenSSLECKeyPairGenerator() {
     49         super(ALGORITHM);
     50     }
     51 
     52     @Override
     53     public KeyPair generateKeyPair() {
     54         if (group == null) {
     55             final String curveName = SIZE_TO_CURVE_NAME.get(DEFAULT_KEY_SIZE);
     56             group = OpenSSLECGroupContext.getCurveByName(curveName);
     57         }
     58 
     59         final OpenSSLKey key = new OpenSSLKey(NativeCrypto.EC_KEY_generate_key(group.getContext()));
     60         return new KeyPair(new OpenSSLECPublicKey(group, key), new OpenSSLECPrivateKey(group, key));
     61     }
     62 
     63     @Override
     64     public void initialize(int keysize, SecureRandom random) {
     65         final String name = SIZE_TO_CURVE_NAME.get(keysize);
     66         if (name == null) {
     67             throw new InvalidParameterException("unknown key size " + keysize);
     68         }
     69 
     70         /*
     71          * Store the group in a temporary variable until we know this is a valid
     72          * group.
     73          */
     74         final OpenSSLECGroupContext possibleGroup = OpenSSLECGroupContext.getCurveByName(name);
     75         if (possibleGroup == null) {
     76             throw new InvalidParameterException("unknown curve " + name);
     77         }
     78 
     79         group = possibleGroup;
     80     }
     81 
     82     @Override
     83     public void initialize(AlgorithmParameterSpec param, SecureRandom random)
     84             throws InvalidAlgorithmParameterException {
     85         if (param instanceof ECParameterSpec) {
     86             ECParameterSpec ecParam = (ECParameterSpec) param;
     87 
     88             group = OpenSSLECGroupContext.getInstance(ecParam);
     89         } else if (param instanceof ECGenParameterSpec) {
     90             ECGenParameterSpec ecParam = (ECGenParameterSpec) param;
     91 
     92             final String curveName = ecParam.getName();
     93 
     94             /*
     95              * Store the group in a temporary variable until we know this is a
     96              * valid group.
     97              */
     98             final OpenSSLECGroupContext possibleGroup = OpenSSLECGroupContext
     99                     .getCurveByName(curveName);
    100             if (possibleGroup == null) {
    101                 throw new InvalidAlgorithmParameterException("unknown curve name: " + curveName);
    102             }
    103 
    104             group = possibleGroup;
    105         } else {
    106             throw new InvalidAlgorithmParameterException(
    107                     "parameter must be ECParameterSpec or ECGenParameterSpec");
    108         }
    109     }
    110 }
    111