78 lines
1.6 KiB
JavaScript
78 lines
1.6 KiB
JavaScript
/*!
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* rsa.js - RSA 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/rsa
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*/
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const assert = require('assert');
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const crypto = require('crypto');
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const PEM = require('../utils/pem');
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/**
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* Verify RSA signature.
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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 RSA key.
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* @returns {Boolean}
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*/
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exports.verify = function verify(alg, msg, sig, key) {
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let pem, name, ctx;
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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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name = normalizeAlg('rsa', alg);
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pem = PEM.encode(key, 'rsa', 'public key');
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ctx = crypto.createVerify(name);
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try {
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ctx.update(msg);
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return ctx.verify(pem, sig);
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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 RSA key.
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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 RSA key.
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* @returns {Buffer} Signature (DER)
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*/
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exports.sign = function sign(alg, msg, key) {
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let pem, name, ctx;
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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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name = normalizeAlg('rsa', alg);
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pem = PEM.encode(key, 'rsa', 'private key');
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ctx = crypto.createSign(name);
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ctx.update(msg);
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return ctx.sign(pem);
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};
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/*
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* Helpers
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*/
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function normalizeAlg(alg, hash) {
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return alg.toUpperCase() + '-' + hash.toUpperCase();
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}
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