chunkPublicKey.js

function chunkPublicKey(key) {
    const start = '-----BEGIN PUBLIC KEY-----';
    const end = '-----END PUBLIC KEY-----';
    const result = [];
    try {
        const arr = key.split('');
        while(arr.length) {
            result.push(arr.splice(0, 64).join(''));
        }
    } catch(e) {
        console.log('Error chunking key', e);
    }

    return `${start}\n\n${result.join('\n')}\n\n${end}`;
}