98 lines
3.7 KiB
JavaScript
98 lines
3.7 KiB
JavaScript
// OpenPGP.js - An OpenPGP implementation in javascript
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// Copyright (C) 2018 Proton Technologies AG
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 3.0 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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/**
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* @fileoverview Implementation of EdDSA following RFC4880bis-03 for OpenPGP
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* @module crypto/public_key/elliptic/eddsa
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* @private
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*/
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import sha512 from 'hash.js/lib/hash/sha/512';
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import nacl from '@openpgp/tweetnacl/nacl-fast-light.js';
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import util from '../../../util';
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import enums from '../../../enums';
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import hash from '../../hash';
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nacl.hash = bytes => new Uint8Array(sha512().update(bytes).digest());
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/**
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* Sign a message using the provided key
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* @param {module:type/oid} oid - Elliptic curve object identifier
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* @param {module:enums.hash} hashAlgo - Hash algorithm used to sign (must be sha256 or stronger)
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* @param {Uint8Array} message - Message to sign
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* @param {Uint8Array} publicKey - Public key
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* @param {Uint8Array} privateKey - Private key used to sign the message
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* @param {Uint8Array} hashed - The hashed message
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* @returns {Promise<{
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* r: Uint8Array,
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* s: Uint8Array
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* }>} Signature of the message
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* @async
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*/
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export async function sign(oid, hashAlgo, message, publicKey, privateKey, hashed) {
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if (hash.getHashByteLength(hashAlgo) < hash.getHashByteLength(enums.hash.sha256)) {
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// see https://tools.ietf.org/id/draft-ietf-openpgp-rfc4880bis-10.html#section-15-7.2
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throw new Error('Hash algorithm too weak: sha256 or stronger is required for EdDSA.');
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}
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const secretKey = util.concatUint8Array([privateKey, publicKey.subarray(1)]);
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const signature = nacl.sign.detached(hashed, secretKey);
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// EdDSA signature params are returned in little-endian format
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return {
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r: signature.subarray(0, 32),
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s: signature.subarray(32)
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};
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}
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/**
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* Verifies if a signature is valid for a message
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* @param {module:type/oid} oid - Elliptic curve object identifier
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* @param {module:enums.hash} hashAlgo - Hash algorithm used in the signature
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* @param {{r: Uint8Array,
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s: Uint8Array}} signature Signature to verify the message
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* @param {Uint8Array} m - Message to verify
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* @param {Uint8Array} publicKey - Public key used to verify the message
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* @param {Uint8Array} hashed - The hashed message
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* @returns {Boolean}
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* @async
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*/
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export async function verify(oid, hashAlgo, { r, s }, m, publicKey, hashed) {
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const signature = util.concatUint8Array([r, s]);
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return nacl.sign.detached.verify(hashed, signature, publicKey.subarray(1));
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}
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/**
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* Validate EdDSA parameters
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* @param {module:type/oid} oid - Elliptic curve object identifier
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* @param {Uint8Array} Q - EdDSA public point
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* @param {Uint8Array} k - EdDSA secret seed
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* @returns {Promise<Boolean>} Whether params are valid.
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* @async
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*/
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export async function validateParams(oid, Q, k) {
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// Check whether the given curve is supported
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if (oid.getName() !== 'ed25519') {
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return false;
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}
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/**
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* Derive public point Q' = dG from private key
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* and expect Q == Q'
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*/
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const { publicKey } = nacl.sign.keyPair.fromSeed(k);
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const dG = new Uint8Array([0x40, ...publicKey]); // Add public key prefix
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return util.equalsUint8Array(Q, dG);
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}
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