audiobookshelf/server/libs/jwa/ecdsa-sig-formatter/param-bytes-for-alg.js

23 lines
466 B
JavaScript

'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;