@cosmjs/crypto

Hashing

This feature allows you to hash data using the SHA-256 algorithm. The code sample demonstrates how to hash a string and output the hash in hexadecimal format.

const { sha256 } = require('@cosmjs/crypto');
const data = new TextEncoder().encode('Hello, world!');
const hash = sha256(data);
console.log(Buffer.from(hash).toString('hex'));

Key Generation

This feature allows you to generate random cryptographic keys. The code sample demonstrates how to generate a 32-byte private key and output it in hexadecimal format.

const { Random } = require('@cosmjs/crypto');
const privateKey = Random.getBytes(32);
console.log(Buffer.from(privateKey).toString('hex'));

Signing

This feature allows you to sign data using the Secp256k1 algorithm. The code sample demonstrates how to sign a hashed message and output the signature in hexadecimal format.

const { Secp256k1, sha256 } = require('@cosmjs/crypto');
const privateKey = Random.getBytes(32);
const message = new TextEncoder().encode('Hello, world!');
const hash = sha256(message);
const signature = Secp256k1.createSignature(hash, privateKey);
console.log(Buffer.from(signature.toFixedLength()).toString('hex'));

Verification

This feature allows you to verify signatures using the Secp256k1 algorithm. The code sample demonstrates how to verify a signature and output whether it is valid.

const { Secp256k1, sha256 } = require('@cosmjs/crypto');
const privateKey = Random.getBytes(32);
const publicKey = Secp256k1.makeKeypair(privateKey).pubkey;
const message = new TextEncoder().encode('Hello, world!');
const hash = sha256(message);
const signature = Secp256k1.createSignature(hash, privateKey);
const isValid = Secp256k1.verifySignature(signature, hash, publicKey);
console.log(isValid);