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kdf_params.js
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kdf_params.js
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// OpenPGP.js - An OpenPGP implementation in javascript
// Copyright (C) 2015-2016 Decentral
//
// This library 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 3.0 of the License, or (at your option) any later version.
//
// This library 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 library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
import { UnsupportedError } from '../packet/packet';
/**
* Implementation of type KDF parameters
*
* {@link https://tools.ietf.org/html/rfc6637#section-7|RFC 6637 7}:
* A key derivation function (KDF) is necessary to implement the EC
* encryption. The Concatenation Key Derivation Function (Approved
* Alternative 1) [NIST-SP800-56A] with the KDF hash function that is
* SHA2-256 [FIPS-180-3] or stronger is REQUIRED.
* @module type/kdf_params
* @private
*/
class KDFParams {
/**
* @param {enums.hash} hash - Hash algorithm
* @param {enums.symmetric} cipher - Symmetric algorithm
*/
constructor(data) {
if (data) {
const { hash, cipher } = data;
this.hash = hash;
this.cipher = cipher;
} else {
this.hash = null;
this.cipher = null;
}
}
/**
* Read KDFParams from an Uint8Array
* @param {Uint8Array} input - Where to read the KDFParams from
* @returns {Number} Number of read bytes.
*/
read(input) {
if (input.length < 4 || input[0] !== 3 || input[1] !== 1) {
throw new UnsupportedError('Cannot read KDFParams');
}
this.hash = input[2];
this.cipher = input[3];
return 4;
}
/**
* Write KDFParams to an Uint8Array
* @returns {Uint8Array} Array with the KDFParams value
*/
write() {
return new Uint8Array([3, 1, this.hash, this.cipher]);
}
}
export default KDFParams;