multibaseKeyToJwk function

Map<String, dynamic> multibaseKeyToJwk(String multibaseKey)

Implementation

Map<String, dynamic> multibaseKeyToJwk(String multibaseKey) {
  var key = _multibaseToUint8List(multibaseKey);
  var indicator = key.sublist(0, 2);
  var indicatorHex = bytesToHex(indicator);
  key = key.sublist(2);
  Map<String, dynamic> jwk = {};
  if (indicatorHex == 'ed01') {
    jwk['kty'] = 'OKP';
    jwk['crv'] = 'Ed25519';
    jwk['x'] = removePaddingFromBase64(base64UrlEncode(key));
  } else if (indicatorHex == 'ec01') {
    jwk['kty'] = 'OKP';
    jwk['crv'] = 'X25519';
    jwk['x'] = removePaddingFromBase64(base64UrlEncode(key));
  } else if (indicatorHex == '8024') {
    jwk['kty'] = 'EC';
    jwk['crv'] = 'P-256';
    var c = getP256();
    var pub = c.compressedHexToPublicKey(hex.encode(key));
    jwk['x'] = removePaddingFromBase64(base64UrlEncode(
        pub.X < BigInt.zero ? intToBytes(pub.X) : unsignedIntToBytes(pub.X)));
    jwk['y'] = removePaddingFromBase64(base64UrlEncode(
        pub.Y < BigInt.zero ? intToBytes(pub.Y) : unsignedIntToBytes(pub.Y)));
  } else if (indicatorHex == 'e701') {
    jwk['kty'] = 'EC';
    jwk['crv'] = 'secp256k1';
    var c = getSecp256k1();
    var pub = c.compressedHexToPublicKey(hex.encode(key));
    jwk['x'] = removePaddingFromBase64(base64UrlEncode(
        pub.X < BigInt.zero ? intToBytes(pub.X) : unsignedIntToBytes(pub.X)));
    jwk['y'] = removePaddingFromBase64(base64UrlEncode(
        pub.Y < BigInt.zero ? intToBytes(pub.Y) : unsignedIntToBytes(pub.Y)));
  } else if (indicatorHex == '8124') {
    jwk['kty'] = 'EC';
    jwk['crv'] = 'P-384';
    var c = getP384();
    var pub = c.compressedHexToPublicKey(hex.encode(key));
    jwk['x'] = removePaddingFromBase64(base64UrlEncode(
        pub.X < BigInt.zero ? intToBytes(pub.X) : unsignedIntToBytes(pub.X)));
    jwk['y'] = removePaddingFromBase64(base64UrlEncode(
        pub.Y < BigInt.zero ? intToBytes(pub.Y) : unsignedIntToBytes(pub.Y)));
  } else if (indicatorHex == '8224') {
    jwk['kty'] = 'EC';
    jwk['crv'] = 'P-521';
    var c = getP521();
    var pub = c.compressedHexToPublicKey(hex.encode(key));
    jwk['x'] = removePaddingFromBase64(base64UrlEncode(
        pub.X < BigInt.zero ? intToBytes(pub.X) : unsignedIntToBytes(pub.X)));
    jwk['y'] = removePaddingFromBase64(base64UrlEncode(
        pub.Y < BigInt.zero ? intToBytes(pub.Y) : unsignedIntToBytes(pub.Y)));
  } else {
    throw UnimplementedError(
        'Unsupported multicodec indicator 0x$indicatorHex');
  }
  return jwk;
}