verifySignature method

Future<bool> verifySignature(List<int> detailString, String hash)

Implementation

Future<bool> verifySignature(List<int> detailString, String hash) async {

  var detail = detailString;

 List<int> signature = detail;
/*

 wallet id and did comparison and fetching part to be added.
 also syncdatatable function is also there in the java code. These 2 must be added
 String path = (await getApplicationSupportDirectory()).path; - Path to the folder where the files are stored when the did is generated from the wallet.

 */
//String path = 'packages/fexr/assets';
String path = (await getApplicationSupportDirectory()).path;

String didPath = '$path/Encrypted/Temp/DID.png';

Future<String> senderDidbinary = Dependencies().imageToBinary(didPath);
String senderDid = await senderDidbinary;
String publicSharePath = '$path/Encrypted/Temp/PublicShare.png';

Future<String> walletIdbinary = Dependencies().imageToBinary(publicSharePath);
String walletId = await walletIdbinary;




 var P = Dependencies().randomPositions("verifier", hash, 32, signature);


 List<int> posForSign = P["posForSign"];

 List<int> originalPos = P["originalPos"];


 StringBuffer senderWalletID = new StringBuffer();

 for (int positionsLevelTwoTrail in posForSign) {

          senderWalletID.write(walletId.substring(positionsLevelTwoTrail, positionsLevelTwoTrail + 1));

      }

String recombinedResult = Dependencies().getPos(senderWalletID.toString(), signature.join());

List<int> positionsLevelZero = new List<int>.generate(32, (index) => 0, growable: false);
for (int k = 0; k < 32; k++) {
  positionsLevelZero[k] = ((originalPos[k]) ~/ 8);

}
StringBuffer decentralizedIDForAuth = new StringBuffer();
for (int value in positionsLevelZero) {
  decentralizedIDForAuth.write(senderDid.substring(value, value + 1));
}



if (recombinedResult == decentralizedIDForAuth.toString()) {
  print("Signature verified");
  return true;
} else {
  print("Signature not verified");
  return false;
}


}