chedder
Version:
88 lines • 2.43 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.inv25519 = exports.unpack25519 = exports.par25519 = exports.neq25519 = exports.pack25519 = exports.sel25519 = exports.set25519 = void 0;
const array_js_1 = require("./array.js");
const verify_js_1 = require("./verify.js");
const core_js_1 = require("./core.js");
function set25519(r, a) {
for (let i = 0; i < 16; i++)
r[i] = a[i] | 0;
}
exports.set25519 = set25519;
function car25519(o) {
let 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);
}
function sel25519(p, q, b) {
let t, c = ~(b - 1);
for (let i = 0; i < 16; i++) {
t = c & (p[i] ^ q[i]);
p[i] ^= t;
q[i] ^= t;
}
}
exports.sel25519 = sel25519;
function pack25519(o, n) {
const m = core_js_1.gf(), t = core_js_1.gf();
let 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;
}
}
exports.pack25519 = pack25519;
function neq25519(a, b) {
const c = array_js_1.ByteArray(32), d = array_js_1.ByteArray(32);
pack25519(c, a);
pack25519(d, b);
return verify_js_1._verify_32(c, 0, d, 0);
}
exports.neq25519 = neq25519;
function par25519(a) {
const d = array_js_1.ByteArray(32);
pack25519(d, a);
return d[0] & 1;
}
exports.par25519 = par25519;
function unpack25519(o, n) {
for (let i = 0; i < 16; i++)
o[i] = n[2 * i] + (n[2 * i + 1] << 8);
o[15] &= 0x7fff;
}
exports.unpack25519 = unpack25519;
function inv25519(o, i) {
const c = core_js_1.gf();
let a;
for (a = 0; a < 16; a++)
c[a] = i[a];
for (a = 253; a >= 0; a--) {
core_js_1.S(c, c);
if (a !== 2 && a !== 4)
core_js_1.M(c, c, i);
}
for (a = 0; a < 16; a++)
o[a] = c[a];
}
exports.inv25519 = inv25519;
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