public Tuple <bool, bool> CheckForAuthandInt(Guid id)
{
bool isDistinct = true;
bool isVerified = true;
SubmissionViewModel submission = _assignmentsService.GetSubmission(id);
var submissions = _assignmentsService.GetSubmissions(submission.Assignment.Id);
MemberViewModel teacher = _membersService.GetMember(submission.Member.TeacherEmail);
byte[] key = CryptographicHelper.AsymmetricDecrypt(
Convert.FromBase64String(submission.SymmetricKey), teacher.PrivateKey);
byte[] iv = CryptographicHelper.AsymmetricDecrypt(
Convert.FromBase64String(submission.SymmetricIV), teacher.PrivateKey);
foreach (SubmissionViewModel sub in submissions)
{
if (sub.FileHash == submission.FileHash && sub.Member.Email != submission.Member.Email)
{
TempData["warning"] += "Assignment is identical to " + sub.Member.Email + "'s assignment!\n";
isDistinct = false;
}
}
if (!CryptographicHelper.VerifySignature(
CryptographicHelper.SymmetricDecrypt(
Convert.FromBase64String(submission.Signature), key, iv),
CryptographicHelper.Hash(GetDecryptedAssignment(id)),
submission.Member.PublicKey))
{
isVerified = false;
}
return(new Tuple <bool, bool>(isDistinct, isVerified));
}