import createHmac from "../create-hmac";
import crt from "../browserify-rsa";
import elliptic from "../elliptic";
import BN from "../bn.js";
import parseKeys from "../parse-asn1";
import * as curves from "./curves.json";
var EC = elliptic.ec;
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);
    }
    else {
        if (signType !== 'rsa' && signType !== 'ecdsa/rsa')
            throw new Error('wrong private key type');
    }
    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);
}
export default sign;
export { getKey };
export { makeKey };