@cere-ddc-sdk/core

Utility package with common logic and classes (CID builder, Scheme for signing requests etc.)

CID Builder

Utility service for building CID based on hash of data, hash algorithm blake2b-256.

Setup

import {CidBuilder} from "@cere-ddc-sdk/core";

const cidBuilder = new CidBuilder();

Create CID

const data = new Uint8Array([1, 2, 3, 4]);
const cid = cidBuilder.build(data);

Scheme

Utility service for signing data using ed25519 or sr25519 algorithm. PolkadotDappScheme is scheme service for signing through Polkadot browser extension.

Setup

import {Scheme} from "@cere-ddc-sdk/core";
import {mnemonicGenerate} from "@polkadot/util-crypto";

const schemeName = "sr25519";
const secretPhrase = mnemonicGenerate();
const scheme = await Scheme.createScheme(createScheme, secretPhrase);

Sign data

const data = new Uint8Array([1, 2, 3, 4]);
const signatureHex = await scheme.sign(data);

Cipher

Utility service for encrypt data.

• NaclCipher is the default service that uses Nacl algorithm for encryption.
• DEK is is a data encryption key used to encrypt the data.

Setup

import {NaclCipher} from "@cere-ddc-sdk/core";

const cipher = new NaclCipher();

Encrypt

const data = new Uint8Array([1, 2, 3, 4]);
const dek = "/data/bob" // can be as Uint8Array

const encryptedData = cipher.encrypt(data, dek);

Decrypt

const encryptedData = new Uint8Array([1, 2, 3, 4]);
const dek = new Uint8Array([1, 2, 3, 4]) // can be as string

const data = cipher.decrypt(encryptedData, dek);