private void SignDocument(Document document, ApplicationUser user, PreparatorySignatureData preparatorySignatureData, RSACryptoServiceProvider rsa)
{
rsa.ImportParameters(ConvetToRsaParameters(preparatorySignatureData.UserKeys));
using (var sha1 = SHA1.Create())
{
var hash = sha1.ComputeHash(document.Content);
var signedBytes = rsa.SignHash(hash, HashAlgorithmName.SHA1, RSASignaturePadding.Pkcs1);
document.SignedByUser = $"{user.Email}{preparatorySignatureData.SignDetails}";
document.Signature = Convert.ToBase64String(signedBytes);
var newContent = document.Content.ToList();
newContent.AddRange(signedBytes);
document.Content = newContent.ToArray();
}
}
private async Task <PreparatorySignatureData> GetPreparatorySignatureDataAsync(IncomingSignatureRequest signatureRequest, Document document, ApplicationUser user)
{
var result = new PreparatorySignatureData();
if (signatureRequest.ClonnedUsingWarrant)
{
var validWarrant = _signatureWarrantRepository
.FindBy(x => x.ToUser == user.Email)
.OrderBy(x => x.Expired)
.LastOrDefault(x => x.Expired < DateTime.Now);
if (validWarrant == null)
{
await _emailNotificator.SendErrorReportToAdmin(new EventReportModel
{
Subject = "Document sign",
Body = "Your all warrants were expired.",
ToUser = user.Email
});
return(null);
}
var originalRequest = _signatureRequestRepository
.FindBy(x => !x.ClonnedUsingWarrant && x.DocumentId == document.Id)
.Single();
result.UserKeys = originalRequest.ApplicationUser.UserKeys;
result.SignDetails = "(using signature warrant)";
}
else
{
result.UserKeys = user.UserKeys;
}
return(result);
}
