IdentityFile.java

/* -*-mode:java; c-basic-offset:2; indent-tabs-mode:nil -*- */
/*
Copyright (c) 2002-2012 ymnk, JCraft,Inc. All rights reserved.

Redistribution and use in source and binary forms, with or without
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  1. Redistributions of source code must retain the above copyright notice,
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  2. Redistributions in binary form must reproduce the above copyright 
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     the documentation and/or other materials provided with the distribution.

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     derived from this software without specific prior written permission.

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*/

package com.jcraft.jsch;

class IdentityFile implements Identity {
    private JSch jsch;
    private KeyPair kpair;
    private String identity;

    static IdentityFile newInstance(String prvfile, String pubfile, JSch jsch) throws JSchException {
        KeyPair kpair = KeyPair.load(jsch, prvfile, pubfile);
        return new IdentityFile(jsch, prvfile, kpair);
    }

    static IdentityFile newInstance(String name, byte[] prvkey, byte[] pubkey, JSch jsch) throws JSchException {
        KeyPair kpair = KeyPair.load(jsch, prvkey, pubkey);
        return new IdentityFile(jsch, name, kpair);
    }

    private IdentityFile(JSch jsch, String name, KeyPair kpair) throws JSchException {
        this.jsch = jsch;
        this.identity = name;
        this.kpair = kpair;
    }

    /**
     * Decrypts this identity with the specified pass-phrase.
     *
     * @param passphrase the pass-phrase for this identity.
     * @return <tt>true</tt> if the decryption is succeeded
     *         or this identity is not cyphered.
     */
    public boolean setPassphrase(byte[] passphrase) throws JSchException {
        return kpair.decrypt(passphrase);
    }

    /**
     * Returns the public-key blob.
     *
     * @return the public-key blob
     */
    public byte[] getPublicKeyBlob() {
        return kpair.getPublicKeyBlob();
    }

    /**
     * Signs on data with this identity, and returns the result.
     *
     * @param data data to be signed
     * @return the signature
     */
    public byte[] getSignature(byte[] data) {
        return kpair.getSignature(data);
    }

    /**
     * @see #setPassphrase(byte[] passphrase)
     * @deprecated This method should not be invoked.
     */
    public boolean decrypt() {
        throw new RuntimeException("not implemented");
    }

    /**
     * Returns the name of the key algorithm.
     *
     * @return "ssh-rsa" or "ssh-dss"
     */
    public String getAlgName() {
        return new String(kpair.getKeyTypeName());
    }

    /**
     * Returns the name of this identity.
     * It will be useful to identify this object in the {@link IdentityRepository}.
     */
    public String getName() {
        return identity;
    }

    /**
     * Returns <tt>true</tt> if this identity is cyphered.
     *
     * @return <tt>true</tt> if this identity is cyphered.
     */
    public boolean isEncrypted() {
        return kpair.isEncrypted();
    }

    /**
     * Disposes internally allocated data, like byte array for the private key.
     */
    public void clear() {
        kpair.dispose();
        kpair = null;
    }

    /**
     * Returns an instance of {@link KeyPair} used in this {@link com.jcraft.jsch.Identity}.
     *
     * @return an instance of {@link KeyPair} used in this {@link com.jcraft.jsch.Identity}.
     */
    public KeyPair getKeyPair() {
        return kpair;
    }
}