/**
* This class represents an NDN Data Signature object.
* Copyright (C) 2014-2016 Regents of the University of California.
* @author: Jeff Thompson <jefft0@remap.ucla.edu>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
* A copy of the GNU Lesser General Public License is in the file COPYING.
*/
/** @ignore */
var Blob = require('./util/blob.js').Blob;
/**
* A DigestSha256Signature extends Signature and holds the signature bits (which
* are only the SHA256 digest) and an empty SignatureInfo for a data packet or
* signed interest.
*
* Create a new DigestSha256Signature object, possibly copying values from
* another object.
*
* @param {DigestSha256Signature} value (optional) If value is a
* DigestSha256Signature, copy its values. If value is omitted, the signature
* is unspecified.
* @constructor
*/
var DigestSha256Signature = function DigestSha256Signature(value)
{
if (typeof value === 'object' && value instanceof DigestSha256Signature)
// Copy the values.
this.signature_ = value.signature_;
else
this.signature_ = new Blob();
this.changeCount_ = 0;
};
exports.DigestSha256Signature = DigestSha256Signature;
/**
* Create a new DigestSha256Signature which is a copy of this object.
* @returns {DigestSha256Signature} A new object which is a copy of this object.
*/
DigestSha256Signature.prototype.clone = function()
{
return new DigestSha256Signature(this);
};
/**
* Get the signature bytes (which are only the digest).
* @returns {Blob} The signature bytes. If not specified, the value isNull().
*/
DigestSha256Signature.prototype.getSignature = function()
{
return this.signature_;
};
/**
* Set the signature bytes to the given value.
* @param {Blob} signature
*/
DigestSha256Signature.prototype.setSignature = function(signature)
{
this.signature_ = typeof signature === 'object' && signature instanceof Blob ?
signature : new Blob(signature);
++this.changeCount_;
};
/**
* Get the change count, which is incremented each time this object is changed.
* @returns {number} The change count.
*/
DigestSha256Signature.prototype.getChangeCount = function()
{
return this.changeCount_;
};
// Define properties so we can change member variable types and implement changeCount_.
/**
* @@deprecated Use getSignature and setSignature.
*/
Object.defineProperty(DigestSha256Signature.prototype, "signature",
{ get: function() { return this.getSignature(); },
set: function(val) { this.setSignature(val); } });