97 lines
3.5 KiB
Java
97 lines
3.5 KiB
Java
/* -*-mode:java; c-basic-offset:2; indent-tabs-mode:nil -*- */
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/*
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Copyright (c) 2015 ymnk, JCraft,Inc. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the distribution.
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3. The names of the authors may not be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JCRAFT,
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INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package com.jcraft.jsch.jce;
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import java.security.*;
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import java.security.interfaces.*;
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import java.security.spec.*;
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import com.jcraft.jsch.JSchException;
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public class KeyPairGenECDSA implements com.jcraft.jsch.KeyPairGenECDSA {
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byte[] d;
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byte[] r;
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byte[] s;
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ECPublicKey pubKey;
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ECPrivateKey prvKey;
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ECParameterSpec params;
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public void init(int key_size) throws Exception {
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String name=null;
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if(key_size==256) name="secp256r1";
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else if(key_size==384) name="secp384r1";
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else if(key_size==521) name="secp521r1";
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else throw new JSchException("unsupported key size: "+key_size);
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for(int i = 0; i<1000; i++) {
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KeyPairGenerator kpg = KeyPairGenerator.getInstance("EC");
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ECGenParameterSpec ecsp = new ECGenParameterSpec(name);
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kpg.initialize(ecsp);
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KeyPair kp = kpg.genKeyPair();
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prvKey = (ECPrivateKey)kp.getPrivate();
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pubKey = (ECPublicKey)kp.getPublic();
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params=pubKey.getParams();
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d=((ECPrivateKey)prvKey).getS().toByteArray();
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ECPoint w = pubKey.getW();
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r = w.getAffineX().toByteArray();
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s = w.getAffineY().toByteArray();
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if(r.length!=s.length) continue;
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if(key_size==256 && r.length==32) break;
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if(key_size==384 && r.length==48) break;
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if(key_size==521 && r.length==66) break;
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}
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if(d.length<r.length){
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d=insert0(d);
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}
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}
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public byte[] getD(){return d;}
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public byte[] getR(){return r;}
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public byte[] getS(){return s;}
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ECPublicKey getPublicKey(){ return pubKey; }
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ECPrivateKey getPrivateKey(){ return prvKey; }
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private byte[] insert0(byte[] buf){
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// if ((buf[0] & 0x80) == 0) return buf;
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byte[] tmp = new byte[buf.length+1];
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System.arraycopy(buf, 0, tmp, 1, buf.length);
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bzero(buf);
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return tmp;
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}
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private byte[] chop0(byte[] buf){
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if(buf[0]!=0 || (buf[1]&0x80)==0) return buf;
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byte[] tmp = new byte[buf.length-1];
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System.arraycopy(buf, 1, tmp, 0, tmp.length);
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bzero(buf);
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return tmp;
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}
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private void bzero(byte[] buf){
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for(int i = 0; i<buf.length; i++) buf[i]=0;
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}
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}
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