acme.js/rsa.js

159 lines
4.3 KiB
JavaScript

/*global Promise*/
'use strict';
var RSA = module.exports;
var native = require('./lib/node/rsa.js');
var x509 = require('./x509.js');
var PEM = require('./pem.js');
//var SSH = require('./ssh-keys.js');
var sha2 = require('./lib/node/sha2.js');
var Enc = require('@root/encoding/base64');
RSA._universal =
'Bluecrypt only supports crypto with standard cross-browser and cross-platform support.';
RSA._stance =
"We take the stance that if you're knowledgeable enough to" +
" properly and securely use non-standard crypto then you shouldn't need Bluecrypt anyway.";
native._stance = RSA._stance;
RSA.generate = native.generate;
// Chopping off the private parts is now part of the public API.
// I thought it sounded a little too crude at first, but it really is the best name in every possible way.
RSA.neuter = function(opts) {
// trying to find the best balance of an immutable copy with custom attributes
var jwk = {};
Object.keys(opts.jwk).forEach(function(k) {
if ('undefined' === typeof opts.jwk[k]) {
return;
}
// ignore RSA private parts
if (-1 !== ['d', 'p', 'q', 'dp', 'dq', 'qi'].indexOf(k)) {
return;
}
jwk[k] = JSON.parse(JSON.stringify(opts.jwk[k]));
});
return jwk;
};
native.neuter = RSA.neuter;
// https://stackoverflow.com/questions/42588786/how-to-fingerprint-a-jwk
RSA.__thumbprint = function(jwk) {
// Use the same entropy for SHA as for key
var len = Math.floor(jwk.n.length * 0.75);
var alg = 'SHA-256';
// TODO this may be a bug
// need to confirm that the padding is no more or less than 1 byte
if (len >= 511) {
alg = 'SHA-512';
} else if (len >= 383) {
alg = 'SHA-384';
}
return sha2
.sum(alg, '{"e":"' + jwk.e + '","kty":"RSA","n":"' + jwk.n + '"}')
.then(function(hash) {
return Enc.bufToUrlBase64(Uint8Array.from(hash));
});
};
RSA.thumbprint = function(opts) {
return Promise.resolve().then(function() {
var jwk;
if ('EC' === opts.kty) {
jwk = opts;
} else if (opts.jwk) {
jwk = opts.jwk;
} else {
return RSA.import(opts).then(function(jwk) {
return RSA.__thumbprint(jwk);
});
}
return RSA.__thumbprint(jwk);
});
};
RSA.export = function(opts) {
return Promise.resolve().then(function() {
if (!opts || !opts.jwk || 'object' !== typeof opts.jwk) {
throw new Error('must pass { jwk: jwk }');
}
var jwk = JSON.parse(JSON.stringify(opts.jwk));
var format = opts.format;
var pub = opts.public;
if (pub || -1 !== ['spki', 'pkix', 'ssh', 'rfc4716'].indexOf(format)) {
jwk = RSA.neuter({ jwk: jwk });
}
if ('RSA' !== jwk.kty) {
throw new Error("options.jwk.kty must be 'RSA' for RSA keys");
}
if (!jwk.p) {
// TODO test for n and e
pub = true;
if (!format || 'pkcs1' === format) {
format = 'pkcs1';
} else if (-1 !== ['spki', 'pkix'].indexOf(format)) {
format = 'spki';
} else if (-1 !== ['ssh', 'rfc4716'].indexOf(format)) {
format = 'ssh';
} else {
throw new Error(
"options.format must be 'spki', 'pkcs1', or 'ssh' for public RSA keys, not (" +
typeof format +
') ' +
format
);
}
} else {
// TODO test for all necessary keys (d, p, q ...)
if (!format || 'pkcs1' === format) {
format = 'pkcs1';
} else if ('pkcs8' !== format) {
throw new Error(
"options.format must be 'pkcs1' or 'pkcs8' for private RSA keys"
);
}
}
if ('pkcs1' === format) {
if (jwk.d) {
return PEM.packBlock({
type: 'RSA PRIVATE KEY',
bytes: x509.packPkcs1(jwk)
});
} else {
return PEM.packBlock({
type: 'RSA PUBLIC KEY',
bytes: x509.packPkcs1(jwk)
});
}
} else if ('pkcs8' === format) {
return PEM.packBlock({
type: 'PRIVATE KEY',
bytes: x509.packPkcs8(jwk)
});
} else if (-1 !== ['spki', 'pkix'].indexOf(format)) {
return PEM.packBlock({
type: 'PUBLIC KEY',
bytes: x509.packSpki(jwk)
});
} else if (-1 !== ['ssh', 'rfc4716'].indexOf(format)) {
return SSH.pack({ jwk: jwk, comment: opts.comment });
} else {
throw new Error(
'Sanity Error: reached unreachable code block with format: ' +
format
);
}
});
};
native.export = RSA.export;
RSA.pack = function(opts) {
// wrapped in a promise for API compatibility
// with the forthcoming browser version
// (and potential future native node capability)
return Promise.resolve().then(function() {
return RSA.export(opts);
});
};