tableau de déchiffrage d'octets avec SymmetricAlgorithm et CryptoStream

Question

Mon encryptage et les méthodes de décryptage:

private static SymmetricAlgorithm GetAlgorithm(string password) 
{ 
    using (Rijndael algorithm = Rijndael.Create()) 
    { 
     using (Rfc2898DeriveBytes rdb = new Rfc2898DeriveBytes(password, new byte[] 
     { 
      0x53, 0x6f, 0x64, 0x69, 0x75, 0x6d, 0x20, 0x43, 0x68, 0x6c, 0x6f, 0x72, 0x69, 0x64, 0x65 
     })) 
     { 
      algorithm.Padding = PaddingMode.ISO10126; 
      algorithm.Key = rdb.GetBytes(32); 
      algorithm.IV = rdb.GetBytes(16); 
     } 
     return algorithm; 
    } 
} 

public static byte[] EncryptBytes(byte[] clearBytes, string password) 
{ 
    ICryptoTransform encryptor; 
    using (SymmetricAlgorithm algorithm = GetAlgorithm(password)) 
     encryptor = algorithm.CreateEncryptor(); 
    using (MemoryStream ms = new MemoryStream()) 
    using (CryptoStream cs = new CryptoStream(ms, encryptor, CryptoStreamMode.Write)) 
    { 
     cs.Write(clearBytes, 0, clearBytes.Length); 
     cs.FlushFinalBlock(); 
     return ms.ToArray(); 
    } 
} 

public static byte[] DecryptBytes(byte[] cipherBytes, string password) 
{ 
    ICryptoTransform decryptor; 
    using (SymmetricAlgorithm algorithm = GetAlgorithm(password)) 
     decryptor = algorithm.CreateDecryptor(); 
    using (MemoryStream ms = new MemoryStream()) 
    using (CryptoStream cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Write)) 
    { 
     cs.Write(cipherBytes, 0, cipherBytes.Length); //here is the exception thrown 
     cs.FlushFinalBlock(); 
     return ms.ToArray(); 
    } 
} 

Comment j'appeler les méthodes:

byte[] prev = File.ReadAllBytes(path + sourcefile); 
byte[] enc = Encryption.EncryptBytes(prev, password); 
byte[] dec = Encryption.DecryptBytes(enc, password); 

File.WriteAllBytes(path + targetfile, dec); 

Lorsque je tente de déchiffrer le tableau d'octets que je reçois l'exception suivante:

System.Security.Cryptography.CryptographicException 
Additional information: padding is invalid and cannot be removed 

J'ai déjà lu quelques solutions possibles mais aucune d'elles n'a résolu mon problème. La clé et IV (InitialisationVector) sont les mêmes, lorsque je crypte et décrypte, ce n'est certainement pas la raison.

Answer 1

méthodes: Correction

ERREUR: vous le Rijndael algorithm dans Mise au rebut du GetAlgorithm(). Ceci est faux: il est l'appelant de GetAlgorithm() qui doit disposer le algorithm (comme vous le faisiez correctement)

private static SymmetricAlgorithm GetAlgorithm(string password) 
{ 
    Rijndael algorithm = Rijndael.Create(); 

    using (Rfc2898DeriveBytes rdb = new Rfc2898DeriveBytes(password, new byte[] 
    { 
     0x53, 0x6f, 0x64, 0x69, 0x75, 0x6d, 0x20, 0x43, 0x68, 0x6c, 0x6f, 0x72, 0x69, 0x64, 0x65 
    })) 
    { 
     algorithm.Padding = PaddingMode.ISO10126; 
     algorithm.Key = rdb.GetBytes(32); 
     algorithm.IV = rdb.GetBytes(16); 
    } 

    return algorithm; 
} 

avertissements petits ici: vous n'étiez pas disposer les ICryptoTransform.

public static byte[] EncryptBytes(byte[] clearBytes, string password) 
{ 
    using (SymmetricAlgorithm algorithm = GetAlgorithm(password)) 
    using (ICryptoTransform encryptor = algorithm.CreateEncryptor()) 
    using (MemoryStream ms = new MemoryStream()) 
    using (CryptoStream cs = new CryptoStream(ms, encryptor, CryptoStreamMode.Write)) 
    { 
     cs.Write(clearBytes, 0, clearBytes.Length); 
     cs.FlushFinalBlock(); 
     return ms.ToArray(); 
    } 
} 

public static byte[] DecryptBytes(byte[] cipherBytes, string password) 
{ 
    using (SymmetricAlgorithm algorithm = GetAlgorithm(password)) 
    using (ICryptoTransform decryptor = algorithm.CreateDecryptor()) 
    using (MemoryStream ms = new MemoryStream()) 
    using (CryptoStream cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Write)) 
    { 
     cs.Write(cipherBytes, 0, cipherBytes.Length); //here is the exception thrown 
     cs.FlushFinalBlock(); 
     return ms.ToArray(); 
    } 
}