/// <summary>
/// Remove password from zip file
/// </summary>
/// <param name="fileName"></param>
/// <param name="password"></param>
/// <returns></returns>
static public bool RemovePasswordFromZip(string fileName, string password)
{
// Poor mans version, extract entire zip and then read into a new one, but handles encrypted zips with empty folders in
string tempDump = string.Empty;
try
{
using (ZipWrapper zip = new ZipWrapper())
{
zip.DecryptPassword = password;
zip.OpenZip(fileName);
tempDump = Path.Combine(Path.GetDirectoryName(fileName), Guid.NewGuid().ToString());
if (!zip.Extract(tempDump))
{
Logger.LogError(zip.LastErrorText);
throw new Exception(string.Format("Unable to extract {0] to {1}", fileName, tempDump));
}
zip.CloseZip();
}
System.IO.File.Delete(fileName); // Remove the original encrypted file
// Now create a new zip without a password
using (ZipWrapper zipDecrypted = new ZipWrapper())
{
zipDecrypted.AppendFiles(tempDump, true);
zipDecrypted.FileName = fileName;
if (!zipDecrypted.WriteZipAndClose()) // Create a new decrypted zip
{
Logger.LogError(zipDecrypted.LastErrorText);
throw new Exception("Failed trying to create decrypted version of: " + fileName);
}
}
}
finally
{
ForceDeleteDirectory(tempDump);
}
return true;
//// Chilkat seems to have an issue with passworded zips containing empty folders, once password is removed(using below procedure that they outline in their samples
//// http://www.example-code.com/csharp/zip_RemoveZipEncryption.asp) errors occur when trying to use the decrypted zip
////
//// Also it seems to have issues with complex nesting, missing/not seeing files below the root after decryption
//using (Chilkat.Zip zip = new Chilkat.Zip())
//{
// zip.UnlockComponent(Chilkat_Serial);
// zip.DecryptPassword = password;
// if (!zip.OpenZip(fileName))
// {
// Logger.LogDebug("Unable to open: " + fileName);
// Logger.LogDebug(zip.LastErrorText);
// return false;
// }
// zip.Encryption = 0;
// zip.PasswordProtect = false;
// string tmpFile = Path.Combine(Path.GetDirectoryName(fileName), Guid.NewGuid().ToString() + ".zip");
// zip.FileName = tmpFile;
// // From Chilkat::
// // Write the unencrypted .zip
// // What happens during WriteZipAndClose? --
// // The encrypted entries from myEncrypted.zip are streamed in,
// // decrypted, and then written out directly into unencrypted.zip
// // In other words, internally the component is smart enough
// // to stream the data from the existing .zip to the new .zip
// // automatically, decrypting in the process..
// if (zip.WriteZipAndClose())
// {
// Logger.LogInfo("Saved unpassworded zip to: " + tmpFile);
// System.IO.File.Copy(tmpFile, fileName, true);
// Logger.LogInfo("Copied: " + tmpFile + " back to: " + fileName);
// System.IO.File.Delete(tmpFile);
// return true;
// }
// else
// {
// Logger.LogDebug("Unable to decrypt: " + fileName);
// Logger.LogDebug(zip.LastErrorText);
// return false;
// }
//}
}
