1/5/2023 0 Comments Decrypt encrypted maxscriptStreamReader oStream = new StreamReader(cryptostreamDecr) īyte oByte = (oStream.ReadToEnd()) īut if I loop by decrypting, encrypting, decrypting, I have an issue.Let's start with encoding. MemoryStream fsDecrypted = new MemoryStream() ĬryptoStream cryptostreamDecr = new CryptoStream(fsread, Throw new System.ApplicationException("The decryption of the file failed") Īnd like public static MemoryStream DecryptFileToMemory(string sInputFilename, string sKey)įileStream fsread = new FileStream(sInputFilename, FileMode.Open, FileAccess.Read) Print the contents of the decrypted file.įsDecrypted.Write(new StreamReader(cryptostreamDecr).ReadToEnd()) DES decryption transform on incoming bytes.ĬryptoStream cryptostreamDecr = new CryptoStream(fsread, desdecrypt, CryptoStreamMode.Read) Create crypto stream set to read and do a ICryptoTransform desdecrypt = DES.CreateDecryptor() Create a DES decryptor from the DES instance. A 64 bit key and IV is required for this provider. StreamWriter fsDecrypted = new StreamWriter(sOutputFilename) Create a file stream to read the encrypted file back.įileStream fsread = new FileStream(sInputFilename, Hi, I'm doing it like public static void DecryptFile(string sInputFilename, string sOutputFilename, string sKey) What am I doing wrong? Why memory stream behave differently? OStream.Read(bytearrayinput, 0, bytearrayinput.Length) īut if I take one of my old encrypted file, decrypt it, encrypt it again with the memory encryption and decrypt it again, the file is then corrupted. So I build public static void EncryptFileFromMemory(String sOutputFilename, MemoryStream oStream, String sKey) Throw new System.ApplicationException("The encryption of the file failed") ICryptoTransform desencrypt = DES.CreateEncryptor() ĬryptoStream cryptostream = new CryptoStream(fsEncrypted, desencrypt, CryptoStreamMode.Write) īyte bytearrayinput = new byte įsInput.Read(bytearrayinput, 0, bytearrayinput.Length) Ĭryptostream.Write(bytearrayinput, 0, bytearrayinput.Length) My base method is: public static void EncryptFile(String sInputFilename, String sOutputFilename, String sKey)įileStream fsInput = new FileStream(sInputFilename, FileMode.Open, FileAccess.Read) įileStream fsEncrypted = new FileStream(sOutputFilename, FileMode.Create, FileAccess.Write) ĭESCryptoServiceProvider DES = new DESCryptoServiceProvider() ĭES.Key = (sKey) ĭES.IV = (sKey) Hi, I would like to create function to encrypt dataset in ecrypted text file and in order to avoid using a temporary file, I would like to create an EncryptToMemory function.
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