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'use strict';
// much of this based on https://github.com/indutny/self-signed/blob/gh-pages/lib/rsa.js
var Buffer = require('safe-buffer').Buffer;
var createHmac = require('create-hmac');
var crt = require('browserify-rsa');
var EC = require('elliptic').ec;
var BN = require('bn.js');
var parseKeys = require('parse-asn1');
var curves = require('./curves.json');
var RSA_PKCS1_PADDING = 1;
function sign(hash, key, hashType, signType, tag) {
var priv = parseKeys(key);
if (priv.curve) {
// rsa keys can be interpreted as ecdsa ones in openssl
if (signType !== 'ecdsa' && signType !== 'ecdsa/rsa') { throw new Error('wrong private key type'); }
return ecSign(hash, priv);
} else if (priv.type === 'dsa') {
if (signType !== 'dsa') { throw new Error('wrong private key type'); }
return dsaSign(hash, priv, hashType);
}
if (signType !== 'rsa' && signType !== 'ecdsa/rsa') { throw new Error('wrong private key type'); }
if (key.padding !== undefined && key.padding !== RSA_PKCS1_PADDING) { throw new Error('illegal or unsupported padding mode'); }
hash = Buffer.concat([tag, hash]);
var len = priv.modulus.byteLength();
var pad = [0, 1];
while (hash.length + pad.length + 1 < len) { pad.push(0xff); }
pad.push(0x00);
var i = -1;
while (++i < hash.length) { pad.push(hash[i]); }
var out = crt(pad, priv);
return out;
}
function ecSign(hash, priv) {
var curveId = curves[priv.curve.join('.')];
if (!curveId) { throw new Error('unknown curve ' + priv.curve.join('.')); }
var curve = new EC(curveId);
var key = curve.keyFromPrivate(priv.privateKey);
var out = key.sign(hash);
return Buffer.from(out.toDER());
}
function dsaSign(hash, priv, algo) {
var x = priv.params.priv_key;
var p = priv.params.p;
var q = priv.params.q;
var g = priv.params.g;
var r = new BN(0);
var k;
var H = bits2int(hash, q).mod(q);
var s = false;
var kv = getKey(x, q, hash, algo);
while (s === false) {
k = makeKey(q, kv, algo);
r = makeR(g, k, p, q);
s = k.invm(q).imul(H.add(x.mul(r))).mod(q);
if (s.cmpn(0) === 0) {
s = false;
r = new BN(0);
}
}
return toDER(r, s);
}
function toDER(r, s) {
r = r.toArray();
s = s.toArray();
// Pad values
if (r[0] & 0x80) { r = [0].concat(r); }
if (s[0] & 0x80) { s = [0].concat(s); }
var total = r.length + s.length + 4;
var res = [
0x30, total, 0x02, r.length
];
res = res.concat(r, [0x02, s.length], s);
return Buffer.from(res);
}
function getKey(x, q, hash, algo) {
x = Buffer.from(x.toArray());
if (x.length < q.byteLength()) {
var zeros = Buffer.alloc(q.byteLength() - x.length);
x = Buffer.concat([zeros, x]);
}
var hlen = hash.length;
var hbits = bits2octets(hash, q);
var v = Buffer.alloc(hlen);
v.fill(1);
var k = Buffer.alloc(hlen);
k = createHmac(algo, k).update(v).update(Buffer.from([0])).update(x).update(hbits).digest();
v = createHmac(algo, k).update(v).digest();
k = createHmac(algo, k).update(v).update(Buffer.from([1])).update(x).update(hbits).digest();
v = createHmac(algo, k).update(v).digest();
return { k: k, v: v };
}
function bits2int(obits, q) {
var bits = new BN(obits);
var shift = (obits.length << 3) - q.bitLength();
if (shift > 0) { bits.ishrn(shift); }
return bits;
}
function bits2octets(bits, q) {
bits = bits2int(bits, q);
bits = bits.mod(q);
var out = Buffer.from(bits.toArray());
if (out.length < q.byteLength()) {
var zeros = Buffer.alloc(q.byteLength() - out.length);
out = Buffer.concat([zeros, out]);
}
return out;
}
function makeKey(q, kv, algo) {
var t;
var k;
do {
t = Buffer.alloc(0);
while (t.length * 8 < q.bitLength()) {
kv.v = createHmac(algo, kv.k).update(kv.v).digest();
t = Buffer.concat([t, kv.v]);
}
k = bits2int(t, q);
kv.k = createHmac(algo, kv.k).update(kv.v).update(Buffer.from([0])).digest();
kv.v = createHmac(algo, kv.k).update(kv.v).digest();
} while (k.cmp(q) !== -1);
return k;
}
function makeR(g, k, p, q) {
return g.toRed(BN.mont(p)).redPow(k).fromRed().mod(q);
}
module.exports = sign;
module.exports.getKey = getKey;
module.exports.makeKey = makeKey;