crypto-key-composer/es/formats/spki/spki-der.js

A library to decompose and compose crypto keys of different types and formats

import { decomposeSubjectPublicKeyInfo, composeSubjectPublicKeyInfo } from './keys';
import { decodeAsn1, encodeAsn1 } from '../../util/asn1-encoder';
import { SubjectPublicKeyInfo } from '../../util/asn1-entities';
import { DecodeAsn1FailedError } from '../../util/errors';
export const decomposePublicKey = subjectPublicKeyInfoAsn1 => {
  // Attempt to decode as SubjectPublicKeyInfo
  let subjectPublicKeyInfo;

  try {
    subjectPublicKeyInfo = decodeAsn1(subjectPublicKeyInfoAsn1, SubjectPublicKeyInfo);
  } catch (err) {
    err.invalidInputKey = err instanceof DecodeAsn1FailedError;
    throw err;
  } // Decompose the SubjectPublicKeyInfo


  const {
    keyAlgorithm,
    keyData
  } = decomposeSubjectPublicKeyInfo(subjectPublicKeyInfo);
  return {
    format: 'spki-der',
    keyAlgorithm,
    keyData
  };
};
export const composePublicKey = ({
  keyAlgorithm,
  keyData
}) => {
  // Generate the SubjectPublicKeyInfo based on the key algorithm & key data
  const subjectPublicKeyInfo = composeSubjectPublicKeyInfo(keyAlgorithm, keyData); // Encode SubjectPublicKeyInfo into ASN1

  const subjectPublicKeyInfoAsn1 = encodeAsn1(subjectPublicKeyInfo, SubjectPublicKeyInfo);
  return subjectPublicKeyInfoAsn1;
};