@omneedia/socketcluster/sample/node_modules/ecdsa-sig-formatter/src/param-bytes-for-alg.js

SocketCluster - A Highly parallelized WebSocket server cluster to make the most of multi-core machines/instances.

'use strict';

function getParamSize(keySize) {
	var result = ((keySize / 8) | 0) + (keySize % 8 === 0 ? 0 : 1);
	return result;
}

var paramBytesForAlg = {
	ES256: getParamSize(256),
	ES384: getParamSize(384),
	ES512: getParamSize(521)
};

function getParamBytesForAlg(alg) {
	var paramBytes = paramBytesForAlg[alg];
	if (paramBytes) {
		return paramBytes;
	}

	throw new Error('Unknown algorithm "' + alg + '"');
}

module.exports = getParamBytesForAlg;