Erreur lors de la fermeture d'un cryptostream [Résolu]

Vianneyp 84 Messages postés jeudi 6 juillet 2006Date d'inscription 6 janvier 2010 Dernière intervention - 17 mai 2009 à 21:07 - Dernière réponse : Vianneyp 84 Messages postés jeudi 6 juillet 2006Date d'inscription 6 janvier 2010 Dernière intervention
- 21 mai 2009 à 12:10
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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 

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Vianneyp 84 Messages postés jeudi 6 juillet 2006Date d'inscription 6 janvier 2010 Dernière intervention - 21 mai 2009 à 12:10
3
Merci
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Après de longes recherches sur Internet, j'ai fini par
trouver une réponse a mon "problème". L'erreur ne peut enfaite pas
être évitée.

Je met tout de même les explications que j'ai trouvée si cela peut servir a
quelqu'un.


C'est a cause du "padding" (remplissage) :

Rijndael est un algorithme de chiffrement par blocs. Cela signifie que la
taille des données d'entrée doit être un multiple de la taille des blocs. Comme
cela ne pas toujours être le cas, on utilise le padding pour remplir les
données jusqu'à ce qu'elles fassent la même taille que le bloc. Pour
"boucher les trous" quoi.


RijndaelManaged possède quatre types de padding :

=> PaddingMode.ANSIX923

=> PaddingMode.ISO10126

=> PaddingMode.PKCS7

=> PaddingMode.Zeros

On peut aussi choisir de ne pas en utiliser (ou de faire soit même le
remplissage) :

=> PaddingMode.None


Le plus simple a comprendre est sans doute PaddingMode.Zeros : il ajoute comme
son nom l'indique des zéros devant les données a chiffrer. Ces zéros serons
ensuite supprimés une fois les données déchiffrés. Mais si les données ne sont
pas déchiffrées avec le bonne clé, elles seront différentes et il sera
impossible de retirer le padding car il ne trouvera pas les zéros à retirer devant
les données. La même erreur peut aussi se produire si l’on utilise un padding différent
lors du chiffrement et du déchiffrage.


D'ou l'erreur "Longueur des données à déchiffrer non valide." si
'l'on utilise aucun padding et l'erreur "Le remplissage n'est pas valide
et ne peut pas être supprimé" si on utilise un padding et que l'on
déchiffre le fichier avec une mauvaise clé.


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<v:f eqn="prod @7 21600 pixelWidth"/>
<v:f eqn="sum @8 21600 0"/>
<v:f eqn="prod @7 21600 pixelHeight"/>
<v:f eqn="sum @10 21600 0"/>
</v:formulas>
<v:path o:extrusionok="f" gradientshapeok="t" o:connecttype="rect"/>
<o:lock v:ext="edit" aspectratio="t"/>
</v:shapetype><v:shape id="Picture_x0020_1" o:spid="_x0000_i1025" type="#_x0000_t75"
alt="http://www.vbfrance.com/imgs2/smile_big.gif" style='width:11.25pt;
height:11.25pt;visibility:visible;mso-wrap-style:square'>
<v:imagedata src="file:///C:\Users\Ikalou\AppData\Local\Temp\msohtmlclip1\01\clip_image001.gif"
o:title="smile_big"/>
</v:shape><![endif]--><!--[if !vml]--><!--[endif]-->.

Merci Vianneyp 3

Avec quelques mots c'est encore mieux Ajouter un commentaire

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