tweetnacl-ts/es/curve25519.js

Port of TweetNaCl cryptographic library to TypeScript (and ES6)

import { ByteArray } from './array';
import { _verify_32 } from './verify';
import { gf, S, M } from './core';
export function set25519(r, a) {
    for (var i = 0; i < 16; i++)
        r[i] = a[i] | 0;
}
function car25519(o) {
    var i, v, c = 1;
    for (i = 0; i < 16; i++) {
        v = o[i] + c + 65535;
        c = Math.floor(v / 65536);
        o[i] = v - c * 65536;
    }
    o[0] += c - 1 + 37 * (c - 1);
}
export function sel25519(p, q, b) {
    var t, c = ~(b - 1);
    for (var i = 0; i < 16; i++) {
        t = c & (p[i] ^ q[i]);
        p[i] ^= t;
        q[i] ^= t;
    }
}
export function pack25519(o, n) {
    var m = gf(), t = gf();
    var i, j, b;
    for (i = 0; i < 16; i++)
        t[i] = n[i];
    car25519(t);
    car25519(t);
    car25519(t);
    for (j = 0; j < 2; j++) {
        m[0] = t[0] - 0xffed;
        for (i = 1; i < 15; i++) {
            m[i] = t[i] - 0xffff - ((m[i - 1] >> 16) & 1);
            m[i - 1] &= 0xffff;
        }
        m[15] = t[15] - 0x7fff - ((m[14] >> 16) & 1);
        b = (m[15] >> 16) & 1;
        m[14] &= 0xffff;
        sel25519(t, m, 1 - b);
    }
    for (i = 0; i < 16; i++) {
        o[2 * i] = t[i] & 0xff;
        o[2 * i + 1] = t[i] >> 8;
    }
}
export function neq25519(a, b) {
    var c = ByteArray(32), d = ByteArray(32);
    pack25519(c, a);
    pack25519(d, b);
    return _verify_32(c, 0, d, 0);
}
export function par25519(a) {
    var d = ByteArray(32);
    pack25519(d, a);
    return d[0] & 1;
}
export function unpack25519(o, n) {
    for (var i = 0; i < 16; i++)
        o[i] = n[2 * i] + (n[2 * i + 1] << 8);
    o[15] &= 0x7fff;
}
export function inv25519(o, i) {
    var c = gf();
    var a;
    for (a = 0; a < 16; a++)
        c[a] = i[a];
    for (a = 253; a >= 0; a--) {
        S(c, c);
        if (a !== 2 && a !== 4)
            M(c, c, i);
    }
    for (a = 0; a < 16; a++)
        o[a] = c[a];
}
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