rasha.js/lib/rasha.js

134 lines
4.0 KiB
JavaScript

'use strict';
var RSA = module.exports;
var SSH = require('./ssh.js');
var PEM = require('./pem.js');
var x509 = require('./x509.js');
var ASN1 = require('./asn1.js');
/*global Promise*/
RSA.importSync = function (opts) {
if (!opts || !opts.pem || 'string' !== typeof opts.pem) {
throw new Error("must pass { pem: pem } as a string");
}
var jwk = { kty: 'RSA', n: null, e: null };
if (0 === opts.pem.indexOf('ssh-rsa ')) {
return SSH.parse(opts.pem, jwk);
}
var pem = opts.pem;
var block = PEM.parseBlock(pem);
//var hex = toHex(u8);
var asn1 = ASN1.parse(block.der);
var meta = x509.guess(block.der, asn1);
if ('pkcs1' === meta.format) {
jwk = x509.parsePkcs1(block.der, asn1, jwk);
} else {
jwk = x509.parsePkcs8(block.der, asn1, jwk);
}
if (opts.public) {
jwk = RSA.nueter(jwk);
}
return jwk;
};
RSA.parse = function parseRsa(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.importSync(opts);
});
};
RSA.toJwk = RSA.import = RSA.parse;
/*
RSAPrivateKey ::= SEQUENCE {
version Version,
modulus INTEGER, -- n
publicExponent INTEGER, -- e
privateExponent INTEGER, -- d
prime1 INTEGER, -- p
prime2 INTEGER, -- q
exponent1 INTEGER, -- d mod (p-1)
exponent2 INTEGER, -- d mod (q-1)
coefficient INTEGER, -- (inverse of q) mod p
otherPrimeInfos OtherPrimeInfos OPTIONAL
}
*/
RSA.exportSync = function (opts) {
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.nueter(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);
}
};
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.exportSync(opts);
});
};
RSA.toPem = RSA.export = RSA.pack;
// snip the _private_ parts... hAHAHAHA!
RSA.nueter = function (jwk) {
// (snip rather than new object to keep potential extra data)
// otherwise we could just do this:
// return { kty: jwk.kty, n: jwk.n, e: jwk.e };
[ 'p', 'q', 'd', 'dp', 'dq', 'qi' ].forEach(function (key) {
if (key in jwk) { jwk[key] = undefined; }
return jwk;
});
return jwk;
};