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Christopher Jeffrey (JJ) chjj

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. 172800 IN DNSKEY 256 3 8 AwEAAcH+axCdUOsTc9o+jmyVq5rsGTh1EcatSumPqEfsPBT+whyj0/Uh D7cWeixV9Wqzj/cnqs8iWELqhdzGX41ZtaNQUfWNfOriASnWmX2D9m/E unplHu8nMSlDnDcT7+llE9tjk5HI1Sr7d9N16ZTIrbVALf65VB2ABbBG 39dyAb7tz21PICJbSp2cd77UF7NFqEVkqohl/LkDw+7Apalmp0qAQT1M gwi2cVxZMKUiciA6EqS+KNajf0A6olO2oEhZnGGY6b1LTg34/YfHdiII ZQqAfqbieruCGHRiSscC2ZE7iNreL/76f4JyIEUNkt6bQA29JsegxorL zQkpF7NKqZc= ; ZSK ; alg = RSASHA256 ; bits = 2048,17 ; key id = 16749
. 172800 IN DNSKEY 257 3 8 AwEAAaz/tAm8yTn4Mfeh5eyI96WSVexTBAvkMgJzkKTOiW1vkIbzxeF3 +/4RgWOq7HrxRixHlFlExOLAJr5emLvN7SWXgnLh4+B5xQlNVz8Og8kv ArMtNROxVQuCaSnIDdD5LKyWbRd2n9WGe2R8PzgCmr3EgVLrjyBxWezF 0jLHwVN8efS3rCj/EWgvIWgb9tarpVUDK/b58Da+sqqls3eNbuv7pr+e oZG+SrDK6nWeL3c6H5Apxz7LjVc1uTIdsIXxuOLYA4/ilBmSVIzuDWfd RUfhHdY6+cn8HFRm+2hM8AnXGXws9555KrUB5qihylGa8subX2Nn6UwN R1AkUTV74bU= ; KSK ; alg = RSASHA256 ; bits = 2048,17 ; key id = 20326
. 172800 IN DNSKEY 385 3 8 AwEAAagAIKlVZrpC6Ia7gEzahOR+9W29euxhJhVVLOyQbSEW0O8gcCjF FVQUTf6v58fLjwBd0YI0EzrAcQqBGCzh/RStIoO8g0NfnfL2MTJRkxoX b
chjj /
Created Oct 23, 2019 — forked from sipa/
Covert ECDH over secp256k1

Covert ECDH over secp256k1

If ECDH is used to establish a shared session secret for an encrypted connection, two elliptic curve points need to be transmitted (one in each direction) before encryption starts. In order to avoid being identifiable as a (specific) ECDH negotiation, ideally those two points are sent in a way that is indistinguishable from random.

This problem is easily addressed by using curves that support Elligator-style encodings: functions that encode a (subset of) elliptic curve points as sequences of bytes with no observable bias: (almost) every byte sequence corresponds to exactly one point, and the others correspond to none.

Unfortunately, no Elligator-style encoding is known for secp256k1.

chjj / .vimrc
Created Feb 12, 2019
mini vimrc
View .vimrc
" ~/.vimrc
set nocompatible
set hidden
set ruler
set visualbell
set noerrorbells
set nostartofline
View bmocha.js
#!/usr/bin/env node
/* eslint no-control-regex: "off" */
'use strict';
const assert = require('assert');
const Path = require('path');
const {
View rewrite.js
'use strict';
const path = require('path');
const fs = require('./lib/utils/fs');
async function findFiles(dir, match, ignore, files) {
const list = await fs.readdir(dir);
for (const name of list) {
if (ignore.has(name))
chjj / sweep-bcc.js
Created Aug 8, 2017
Sweep BCC from trezor multisig
View sweep-bcc.js
'use strict';
// Sweep bcc from trezor multisig.
const assert = require('assert');
const util = require('util');
const trezor = require('trezor.js-node');
const HDPublicKey = require('bcoin/lib/hd/public');
const HARDENED = 0x80000000;
View 1000-cost.json
"hash": "0000000000000000018c59d807bff651ead9f8fd6eef075ee5cffcf98bf4674c",
"height": 464208,
"size": 998109,
"txs": 684,
"inputs": 6162,
"outputs": 1362,
"inputCost": 5578086,
"outputCost": 271012,
View libsecp256k1.wast
This file has been truncated, but you can view the full file.
(type $0 (func (param i32 i32)))
(type $1 (func (param i32 i32 i32 i32 i32 i32) (result i32)))
(type $2 (func (param i32)))
(type $3 (func (result i32)))
(type $4 (func (param i32 i32 i32 i32) (result i32)))
(type $5 (func (param i32 i32 i32) (result i32)))
(type $6 (func))
(type $7 (func (param i32) (result i32)))
View fisqrt.js
// Fast inverse square root in javascript
// Example:
// > 1 / Math.sqrt(0.15625)
// 2.5298221281347035
// > Math.pow(0.15625, -0.5)
// 2.5298221281347035
// > Q_rsqrt(0.15625)
// 2.5254863388218056
View gist:358d4b1ab1a9ad3e2f9c2421db6d4794
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