util

Utility functions for CESS SDK

Installation

npm install @cessnetwork/util

Overview

The @cessnetwork/util package provides a comprehensive set of utility functions for working with the CESS (Cumulus Encrypted Storage System) network. This package includes utilities for:

• Account management and address validation

• Cryptographic operations and signing

• File hashing and integrity verification

• Network operations

• Data formatting and conversion

• Error handling

Core Modules

Account Utilities

Functions for managing CESS accounts, validating addresses, and converting between different formats.

import {
    parsePublicKey,
    validateAddress,
    convertAddressFormat,
    encodePublicKeyAsTestNetAddr,
    encodePublicKeyAsMainNetAddr,
    convertAddrToMainNet,
    convertAddrToTestNet,
    evmAddrToCessAddr
} from '@cessnetwork/util';

// Parse a public key from an address
const publicKey = parsePublicKey('cXabc123...');
console.log(publicKey);

// Validate an address
const isValid = validateAddress('cXabc123...');
console.log(isValid);

// Validate an address with specific SS58 format
const isValidTestnet = validateAddress('cXabc123...', 11330);
console.log(isValidTestnet);

// Convert address format
const converted = convertAddressFormat('cXabc123...', 11331);
console.log(converted);

// Convert testnet address to mainnet
const mainnetAddr = convertAddrToMainNet('cXabc123...');
console.log(mainnetAddr);

// Convert mainnet address to testnet
const testnetAddr = convertAddrToTestNet('ceabc123...');
console.log(testnetAddr);

// Convert Ethereum address to CESS address
const cessAddr = evmAddrToCessAddr('0x742d35Cc6634C0532925a3b844Bc454e4438f44e', 11331);
console.log(cessAddr);

Signing Utilities

Functions for signing messages and verifying signatures using mnemonics and cryptographic keys.

import {
    sr25519SignWithMnemonic,
    verifySignature,
    safeSignUnixTime,
    parseEvmAccFromEvmSign,
    getWrappedMsg
} from '@cessnetwork/util';

// Sign a message with mnemonic using SR25519
const mnemonic = 'your twelve word mnemonic phrase here';
const signature = sr25519SignWithMnemonic(mnemonic, 'Hello, CESS!');
console.log(signature);

// Verify a signature
const isValid = verifySignature('Hello, CESS!', signature, 'ceabc123...');
console.log(isValid);

// Sign current unix time for gateway requests (as used in gateway operations)
const unixTime = Date.now().toString();
const wrappedMsg = getWrappedMsg(unixTime);
const gatewaySignature = safeSignUnixTime(unixTime, mnemonic);
console.log(gatewaySignature);

// Parse Ethereum account from Ethereum signature
const ethAddress = parseEvmAccFromEvmSign('Hello, CESS!', '0x...signature...');
console.log(ethAddress);

Hash Utilities

Functions for calculating file and data hashes.

import { calcSHA256, calcPathSHA256 } from '@cessnetwork/util';

// Calculate SHA256 hash of a buffer
const buffer = Buffer.from('Hello, CESS!');
const hash = calcSHA256(buffer);
console.log(hash);

// Calculate SHA256 hash of a file
const fileHash = await calcPathSHA256('/path/to/file');
console.log(fileHash);

API Reference

Account Functions

• parsePublicKey(address: string): Uint8Array - Parse public key from address

• encodePublicKeyAsTestNetAddr(publicKey: Uint8Array): string - Encode public key as testnet address (ss58Format: 11330)

• encodePublicKeyAsMainNetAddr(publicKey: Uint8Array): string - Encode public key as mainnet address (ss58Format: 11331)

• validateAddress(address: string, ss58Format?: number): boolean - Validate address with optional ss58Format check

• convertAddressFormat(address: string, targetSs58Format: number): string - Convert address to specified ss58Format

• convertAddrToMainNet(address: string): string - Convert address from ss58Format 11330 to 11331 (cX... -> ce...)

• convertAddrToTestNet(address: string): string - Convert address from ss58Format 11331 to 11330 (ce... -> cX...)

• evmAddrToCessAddr(evmAddr: string, targetSs58Format: number): string - Convert Ethereum address to CESS address with specified ss58Format

Signing Functions

• safeSignUnixTime(unixTime: string | number, mnemonic: string): Uint8Array - Sign a current unix time with a mnemonic using SR25519

• getWrappedMsg(unixTime: string | number): Uint8Array - Wrap a unix time message with tags

• sr25519SignWithMnemonic(mnemonic: string, msg: string): Uint8Array - Sign a message with a mnemonic using SR25519

• verifySignature(msg: string | Uint8Array, sign: Uint8Array, account: string): boolean - Verify a signature with a public key

• parseEvmAccFromEvmSign(message: string, sign: string): string - Parse Ethereum account from Ethereum signature

Hash Functions

• calcSHA256(data: Buffer): string - Calculate SHA256 hash of buffer data

• calcPathSHA256(filePath: string): Promise<string> - Calculate SHA256 hash of a file

• calcFileSHA256(stream: NodeJS.ReadableStream): Promise<string> - Calculate SHA256 hash of a stream

• calcMD5(data: string): string - Calculate MD5 hash of string data

• calcPathSHA256Bytes(filePath: string): Promise<Buffer> - Calculate SHA256 hash as Buffer

• calcFileSHA256Bytes(stream: NodeJS.ReadableStream): Promise<Buffer> - Calculate SHA256 hash of stream as Buffer

File Functions

• getFileSize(filePath: string): number - Get the size of a file

• readChunk(filePath: string, start: number, end: number): Promise<Buffer> - Read a chunk of a file

• ensureDir(dirPath: string): void - Ensure directory exists

Network Functions

• checkConnectivity(host: string, port: number): Promise<boolean> - Check network connectivity

• pingHost(host: string): Promise<PingResponse> - Ping a host

String Functions

• toBase64(data: string): string - Convert string to base64

• fromBase64(data: string): string - Convert base64 to string

• toHex(data: string): string - Convert string to hex

• fromHex(data: string): string - Convert hex to string

Time Functions

• formatTimestamp(timestamp: number): string - Format timestamp to readable string

• getCurrentTimestamp(): number - Get current timestamp

Gateway Utilities

The utility functions play a critical role in gateway operations, particularly for authentication and communication with the CESS storage network.

Gateway Authentication Functions

When interacting with CESS gateways, you need specific utilities to sign messages and authenticate:

import { getWrappedMsg, safeSignUnixTime } from '@cessnetwork/util';

// Example: Gateway authentication preparation
// The signature and message are then used to obtain a token from the gateway
// as demonstrated in the @cessnetwork/api gateway operations
async function prepareGatewayAuthentication() {
  const mnemonic = process.env.CESS_PRIVATE_KEY || 'your twelve word mnemonic phrase or private key here';
  
  // Step 1: Create a timestamp message to sign
  const sign_message = Date.now().toString();
  
  // Step 2: Wrap the message with <Bytes> tags for proper signature format
  const wrappedMsg = getWrappedMsg(sign_message);
  
  // Step 3: Sign the timestamp with your mnemonic
  const signature = safeSignUnixTime(sign_message, mnemonic);
  
  console.log('Timestamp message:', sign_message);
  console.log('Wrapped message for signing:', wrappedMsg);
  console.log('Signature:', signature);
 
  // create cess client and verify it
  // const verifyRes = cess.keyring.verify(getWrappedMsg(sign_message), signature, cess.getPublicKey())
  // console.log('verify result:', verifyRes);
}

prepareGatewayAuthentication();