71 lines
1.7 KiB
JavaScript
71 lines
1.7 KiB
JavaScript
/*!
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* ecdsa.js - ecdsa for bcoin
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* Copyright (c) 2016-2017, Christopher Jeffrey (MIT License).
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* https://github.com/bcoin-org/bcoin
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*/
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'use strict';
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/**
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* @module crypto/ecdsa
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*/
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const assert = require('assert');
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const elliptic = require('elliptic');
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const digest = require('./digest');
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/**
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* Verify ECDSA signature.
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* @param {String} curve - Curve name.
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* @param {String} alg - Hash algorithm.
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* @param {Buffer} msg - Signed message.
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* @param {Buffer} sig - Signature.
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* @param {Buffer} key - ASN1 serialized ECDSA key.
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* @returns {Boolean}
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*/
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exports.verify = function verify(curve, alg, msg, sig, key) {
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let ec, hash;
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assert(typeof curve === 'string', 'No curve selected.');
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assert(typeof alg === 'string', 'No algorithm selected.');
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assert(Buffer.isBuffer(msg));
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assert(Buffer.isBuffer(sig));
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assert(Buffer.isBuffer(key));
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ec = elliptic.ec(curve);
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hash = digest.hash(alg, msg);
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try {
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return ec.verify(hash, sig, key);
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} catch (e) {
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return false;
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}
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};
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/**
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* Sign message with ECDSA key.
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* @memberof module:crypto/pk.ecdsa
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* @param {String} curve - Curve name.
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* @param {String} alg - Hash algorithm.
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* @param {Buffer} msg - Signed message.
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* @param {Buffer} key - ASN1 serialized ECDSA key.
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* @returns {Buffer} Signature (DER)
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*/
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exports.sign = function sign(curve, alg, msg, key) {
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let ec, hash, sig;
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assert(typeof curve === 'string', 'No curve selected.');
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assert(typeof alg === 'string', 'No algorithm selected.');
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assert(Buffer.isBuffer(msg));
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assert(Buffer.isBuffer(key));
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ec = elliptic.ec(curve);
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hash = digest.hash(alg, msg);
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sig = ec.sign(hash, key, { canonical: true });
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return Buffer.from(sig.toDER());
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};
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