CODEWITHSUNDEEP
javascriptcryptographyrsablockchainbitcoin
Sina Mirshafiei
Sina Mirshafiei

Reputation: 312

Generate Private key from seed

Is there any way to generate a private key and public key from a string like a user's password? I want to retrieve it every time the user enters password

I use this elliptic but it randomly generates a keyPair

const EC = require('elliptic').ec;
const ec = new EC('secp256k1');
let keyPair = ec.genKeyPair();

Upvotes: 2

Views: 4830

Answers (1)

JBaczuk
JBaczuk

Reputation: 14639

Disclaimer: Don't create brain wallets: especially low entropy human generated ones.

You can generate any 32-byte value (technically valid private keys on secp256k1 curve must be between 0x1 to 0xFFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFE BAAE DCE6 AF48 A03B BFD2 5E8C D036 4140) see Bitcoin Wiki

One way to do this is to hash the string you want to generate the key from:

const EC = require('elliptic').ec;
var crypto = require('crypto');

const ec = new EC('secp256k1');
let secret = crypto.createHash('sha256').update('password').digest('hex');
let keyPair = ec.keyFromSecret(secret);

Upvotes: 2

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