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113 lines
2.8 KiB
113 lines
2.8 KiB
// Copyright 2012 Joyent, Inc. All rights reserved.
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var assert = require('assert-plus');
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var sshpk = require('sshpk');
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var util = require('util');
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var HASH_ALGOS = {
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'sha1': true,
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'sha256': true,
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'sha512': true
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};
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var PK_ALGOS = {
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'rsa': true,
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'dsa': true,
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'ecdsa': true
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};
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function HttpSignatureError(message, caller) {
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if (Error.captureStackTrace)
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Error.captureStackTrace(this, caller || HttpSignatureError);
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this.message = message;
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this.name = caller.name;
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}
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util.inherits(HttpSignatureError, Error);
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function InvalidAlgorithmError(message) {
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HttpSignatureError.call(this, message, InvalidAlgorithmError);
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}
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util.inherits(InvalidAlgorithmError, HttpSignatureError);
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function validateAlgorithm(algorithm) {
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var alg = algorithm.toLowerCase().split('-');
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if (alg.length !== 2) {
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throw (new InvalidAlgorithmError(alg[0].toUpperCase() + ' is not a ' +
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'valid algorithm'));
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}
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if (alg[0] !== 'hmac' && !PK_ALGOS[alg[0]]) {
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throw (new InvalidAlgorithmError(alg[0].toUpperCase() + ' type keys ' +
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'are not supported'));
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}
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if (!HASH_ALGOS[alg[1]]) {
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throw (new InvalidAlgorithmError(alg[1].toUpperCase() + ' is not a ' +
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'supported hash algorithm'));
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}
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return (alg);
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}
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///--- API
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module.exports = {
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HASH_ALGOS: HASH_ALGOS,
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PK_ALGOS: PK_ALGOS,
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HttpSignatureError: HttpSignatureError,
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InvalidAlgorithmError: InvalidAlgorithmError,
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validateAlgorithm: validateAlgorithm,
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/**
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* Converts an OpenSSH public key (rsa only) to a PKCS#8 PEM file.
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*
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* The intent of this module is to interoperate with OpenSSL only,
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* specifically the node crypto module's `verify` method.
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*
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* @param {String} key an OpenSSH public key.
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* @return {String} PEM encoded form of the RSA public key.
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* @throws {TypeError} on bad input.
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* @throws {Error} on invalid ssh key formatted data.
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*/
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sshKeyToPEM: function sshKeyToPEM(key) {
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assert.string(key, 'ssh_key');
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var k = sshpk.parseKey(key, 'ssh');
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return (k.toString('pem'));
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},
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/**
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* Generates an OpenSSH fingerprint from an ssh public key.
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*
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* @param {String} key an OpenSSH public key.
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* @return {String} key fingerprint.
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* @throws {TypeError} on bad input.
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* @throws {Error} if what you passed doesn't look like an ssh public key.
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*/
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fingerprint: function fingerprint(key) {
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assert.string(key, 'ssh_key');
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var k = sshpk.parseKey(key, 'ssh');
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return (k.fingerprint('md5').toString('hex'));
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},
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/**
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* Converts a PKGCS#8 PEM file to an OpenSSH public key (rsa)
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*
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* The reverse of the above function.
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*/
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pemToRsaSSHKey: function pemToRsaSSHKey(pem, comment) {
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assert.equal('string', typeof (pem), 'typeof pem');
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var k = sshpk.parseKey(pem, 'pem');
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k.comment = comment;
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return (k.toString('ssh'));
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}
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};
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