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Bonjour,
J'ai récupéré une source extrêmement bien commentée sur CodeProject :
http://www.codeproject.com/KB/security/EncryptFile.aspx
.
Le code sert donc à chiffrer des fichiers en utilisant Rijndael, comme vous
pouvez le constater. J’y ai apporté diverses modifications comme l'ajout du nom
de fichier (avec son extension) sur 256 octets pour restauration et le sha-512
du fichier (sur 64 octets) pour comparaison une fois le fichier déchiffré.
Mon problème c'est que, et déjà dans le source originale, si le fichier est
déchiffré a l'aide d'une clé qui ne correspond pas a celle qui a servit au
chiffrement, une exception est levée lors de la fermeture du cryptostream :
<!--[if !supportLineBreakNewLine]-->
<!--[endif]-->
'Close
FileStreams and CryptoStream.
csCryptoStream.Close() ' Erreur si divergence entre les clés
fsInput.Close()
fsOutput.Close()
L'erreur renvoyée est :
"Longueur des données à déchiffrer non valide." (N° 5)
L'auteur semble reposer sur cette erreur pour indiquer à l'utilisateur que le
mot de passe n'est pas bon :
Catch
fsInput.Close()
fsOutput.Close()
If Direction =
CryptoAction.ActionDecrypt Then
Dim fileDelete As New
FileInfo(txtDestinationDecrypt.Text)
fileDelete.Delete()
pbStatus.Value = 0
txtPassDecrypt.Text =
""
txtConPassDecrypt.Text = ""
MsgBox("Please check
to make sure that you entered the correct" + _
"password.", MsgBoxStyle.Exclamation, "Invalid
Password")
Seulement je préfèrerai éviter cette erreur et me reposer sur la comparaison
des sha-512, qui me semble être une meilleur alternative. Savez-vous à quoi est
due cette erreur ? Le fichier décrypté de devrai t-il pas être simplement
différent ?
Sauriez-vous comment l'éviter ?
Merci d'avance pour votre aide.
Afficher la suite