content: /* -*-mode:java; c-basic-offset:2; indent-tabs-mode:nil -*- */
  /*
  Copyright (c) 2013-2018 ymnk, JCraft,Inc. All rights reserved.
  
  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions are met:
  
    1. Redistributions of source code must retain the above copyright notice,
       this list of conditions and the following disclaimer.
  
    2. Redistributions in binary form must reproduce the above copyright 
       notice, this list of conditions and the following disclaimer in 
       the documentation and/or other materials provided with the distribution.
  
    3. The names of the authors may not be used to endorse or promote products
       derived from this software without specific prior written permission.
  
  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
  INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
  FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JCRAFT,
  INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
  OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
  EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
  
  package com.jcraft.jsch;
  
  import java.util.Vector;
  import java.math.BigInteger;
  
  public class KeyPairPKCS8 extends KeyPair {
    private static final byte[] rsaEncryption = {
      (byte)0x2a, (byte)0x86, (byte)0x48, (byte)0x86,
      (byte)0xf7, (byte)0x0d, (byte)0x01, (byte)0x01, (byte)0x01
    };
  
    private static final byte[] dsaEncryption = {
      (byte)0x2a, (byte)0x86, (byte)0x48, (byte)0xce,
      (byte)0x38, (byte)0x04, (byte)0x1
    };
  
    private static final byte[] pbes2 = {
      (byte)0x2a, (byte)0x86, (byte)0x48, (byte)0x86, (byte)0xf7,
      (byte)0x0d, (byte)0x01, (byte)0x05, (byte)0x0d 
    };
  
    private static final byte[] pbkdf2 = {
      (byte)0x2a, (byte)0x86, (byte)0x48, (byte)0x86, (byte)0xf7,
      (byte)0x0d, (byte)0x01, (byte)0x05, (byte)0x0c 
    };
  
    private static final byte[] aes128cbc = {
      (byte)0x60, (byte)0x86, (byte)0x48, (byte)0x01, (byte)0x65,
      (byte)0x03, (byte)0x04, (byte)0x01, (byte)0x02 
    };
  
    private static final byte[] aes192cbc = {
      (byte)0x60, (byte)0x86, (byte)0x48, (byte)0x01, (byte)0x65,
      (byte)0x03, (byte)0x04, (byte)0x01, (byte)0x16 
    };
  
    private static final byte[] aes256cbc = {
      (byte)0x60, (byte)0x86, (byte)0x48, (byte)0x01, (byte)0x65,
      (byte)0x03, (byte)0x04, (byte)0x01, (byte)0x2a 
    };
  
    private static final byte[] pbeWithMD5AndDESCBC = {
      (byte)0x2a, (byte)0x86, (byte)0x48, (byte)0x86, (byte)0xf7,
      (byte)0x0d, (byte)0x01, (byte)0x05, (byte)0x03
    };
  
    private KeyPair kpair = null;
  
    public KeyPairPKCS8(JSch jsch){
      super(jsch);
    }
  
    void generate(int key_size) throws JSchException{
    }
  
    private static final byte[] begin=Util.str2byte("-----BEGIN DSA PRIVATE KEY-----");
    private static final byte[] end=Util.str2byte("-----END DSA PRIVATE KEY-----");
  
    byte[] getBegin(){ return begin; }
    byte[] getEnd(){ return end; }
  
    byte[] getPrivateKey(){
      return null;
    }
  
    boolean parse(byte[] plain){
  
      /* from RFC5208
        PrivateKeyInfo ::= SEQUENCE {
          version                   Version,
          privateKeyAlgorithm       PrivateKeyAlgorithmIdentifier,
          privateKey                PrivateKey,
          attributes           [0]  IMPLICIT Attributes OPTIONAL 
        }
        Version ::= INTEGER
        PrivateKeyAlgorithmIdentifier ::= AlgorithmIdentifier
        PrivateKey ::= OCTET STRING
        Attributes ::= SET OF Attribute
      }
      */
  
      try{
        Vector values = new Vector();
  
        ASN1[] contents = null;
        ASN1 asn1 = new ASN1(plain);
        contents = asn1.getContents();
  
        ASN1 privateKeyAlgorithm = contents[1];
        ASN1 privateKey = contents[2];
  
        contents = privateKeyAlgorithm.getContents();
        byte[] privateKeyAlgorithmID = contents[0].getContent();
        contents = contents[1].getContents();
        if(contents.length>0){
          for(int i = 0; i < contents.length; i++){
            values.addElement(contents[i].getContent());
          }
        }
  
        byte[] _data = privateKey.getContent();
  
        KeyPair _kpair = null;
        if(Util.array_equals(privateKeyAlgorithmID, rsaEncryption)){
          _kpair = new KeyPairRSA(jsch);
          _kpair.copy(this);
          if(_kpair.parse(_data)){
            kpair = _kpair;
          } 
        }
        else if(Util.array_equals(privateKeyAlgorithmID, dsaEncryption)){
          asn1 = new ASN1(_data);
          if(values.size() == 0) {  // embedded DSA parameters format
            /*
               SEQUENCE
                 SEQUENCE
                   INTEGER    // P_array
                   INTEGER    // Q_array
                   INTEGER    // G_array
                 INTEGER      // prv_array
            */
            contents = asn1.getContents();
            byte[] bar = contents[1].getContent();
            contents = contents[0].getContents();
            for(int i = 0; i < contents.length; i++){
              values.addElement(contents[i].getContent());
            }
            values.addElement(bar);
          }
          else {
            /*
               INTEGER      // prv_array
            */
            values.addElement(asn1.getContent());
          }
  
          byte[] P_array = (byte[])values.elementAt(0);
          byte[] Q_array = (byte[])values.elementAt(1);
          byte[] G_array = (byte[])values.elementAt(2);
          byte[] prv_array = (byte[])values.elementAt(3);
          // Y = g^X mode p
          byte[] pub_array =
            (new BigInteger(G_array)).
              modPow(new BigInteger(prv_array), new BigInteger(P_array)).
              toByteArray();
  
          KeyPairDSA _key = new KeyPairDSA(jsch,
                                           P_array, Q_array, G_array,
                                           pub_array, prv_array);
          plain = _key.getPrivateKey();
  
          _kpair = new KeyPairDSA(jsch);
          _kpair.copy(this);
          if(_kpair.parse(plain)){
            kpair = _kpair;
          }
        }
      }
      catch(ASN1Exception e){
        return false;
      }
      catch(Exception e){
        //System.err.println(e);
        return false;
      }
      return kpair != null;
    }
  
    public byte[] getPublicKeyBlob(){
      return kpair.getPublicKeyBlob();
    }
  
    byte[] getKeyTypeName(){ return kpair.getKeyTypeName();}
    public int getKeyType(){return kpair.getKeyType();}
  
    public int getKeySize(){
      return kpair.getKeySize();
    }
  
    public byte[] getSignature(byte[] data){
      return kpair.getSignature(data);
    }
  
    public Signature getVerifier(){
      return kpair.getVerifier();
    }
  
    public byte[] forSSHAgent() throws JSchException {
      return kpair.forSSHAgent();
    }
  
    public boolean decrypt(byte[] _passphrase){
      if(!isEncrypted()){
        return true;
      }
      if(_passphrase==null){
        return !isEncrypted();
      }
  
      /*
        SEQUENCE
          SEQUENCE
            OBJECT            :PBES2
            SEQUENCE
              SEQUENCE
                OBJECT            :PBKDF2
                SEQUENCE
                  OCTET STRING      [HEX DUMP]:E4E24ADC9C00BD4D
                  INTEGER           :0800
              SEQUENCE
                OBJECT            :aes-128-cbc
                OCTET STRING      [HEX DUMP]:5B66E6B3BF03944C92317BC370CC3AD0
          OCTET STRING      [HEX DUMP]:
  
  or
  
        SEQUENCE
          SEQUENCE
            OBJECT            :pbeWithMD5AndDES-CBC
            SEQUENCE
              OCTET STRING      [HEX DUMP]:DBF75ECB69E3C0FC
              INTEGER           :0800
          OCTET STRING      [HEX DUMP]
      */
  
      try{
  
        ASN1[] contents = null;
        ASN1 asn1 = new ASN1(data);
  
        contents =  asn1.getContents();
  
        byte[] _data = contents[1].getContent();
  
        ASN1 pbes = contents[0];
        contents = pbes.getContents();
        byte[] pbesid = contents[0].getContent();
        ASN1 pbesparam = contents[1];
  
        byte[] salt = null;
        int iterations = 0;
        byte[] iv = null;
        byte[] encryptfuncid = null;
  
        if(Util.array_equals(pbesid, pbes2)){
          contents = pbesparam.getContents();
          ASN1 pbkdf = contents[0];
          ASN1 encryptfunc = contents[1];
          contents = pbkdf.getContents();
          byte[] pbkdfid = contents[0].getContent();
          ASN1 pbkdffunc = contents[1];
          contents = pbkdffunc.getContents();
          salt = contents[0].getContent();
          iterations = 
            Integer.parseInt((new BigInteger(contents[1].getContent())).toString());
  
          contents = encryptfunc.getContents();
          encryptfuncid = contents[0].getContent();
          iv = contents[1].getContent();
        }
        else if(Util.array_equals(pbesid, pbeWithMD5AndDESCBC)){
          // not supported
          return false;
        }
        else {
          return false;
        }
  
        Cipher cipher=getCipher(encryptfuncid);
        if(cipher==null) return false;
  
        byte[] key=null;
        try{
          Class c=Class.forName((String)jsch.getConfig("pbkdf"));
          PBKDF tmp=(PBKDF)(c.newInstance());
          key = tmp.getKey(_passphrase, salt, iterations, cipher.getBlockSize());
        }
        catch(Exception ee){
        }
  
        if(key==null){
          return false;
        }
  
        cipher.init(Cipher.DECRYPT_MODE, key, iv);
        Util.bzero(key);
        byte[] plain=new byte[_data.length];
        cipher.update(_data, 0, _data.length, plain, 0);
        if(parse(plain)){
          encrypted=false;
          return true;
        }
      }
      catch(ASN1Exception e){
        // System.err.println(e);
      }
      catch(Exception e){
        // System.err.println(e);
      }
  
      return false;
    }
  
    Cipher getCipher(byte[] id){
      Cipher cipher=null;
      String name = null;
      try{
        if(Util.array_equals(id, aes128cbc)){
          name="aes128-cbc";
        }
        else if(Util.array_equals(id, aes192cbc)){
          name="aes192-cbc";
        }
        else if(Util.array_equals(id, aes256cbc)){
          name="aes256-cbc";
        }
        Class c=Class.forName((String)jsch.getConfig(name));
        cipher=(Cipher)(c.newInstance());
      }
      catch(Exception e){
        if(JSch.getLogger().isEnabled(Logger.FATAL)){
          String message="";
          if(name==null){
            message="unknown oid: "+Util.toHex(id);
          }
          else {
            message="function "+name+" is not supported";
          }
          JSch.getLogger().log(Logger.FATAL, "PKCS8: "+message);
        }
      }
      return cipher;
    }
  }
  