decryptor

. cryptography. cryptostream decryptor = new system. Security. cryptography. cryptostream (Decryptstream, decrypttransform, system. Security. cryptography. cryptostreammode. Write );// Write a byte sequence to the current cryptostream (the decryption process is completed)Decryptor. Write (encryptbytes, 0, encryptbytes. Length );Decryptor. Close ();// Convert the

[] Encrypted = Msencrypt. toarray (); /**/ /**/ /**/ //////////////////////////////////////// /////////////// // This is where the data cocould be transmitted or saved. /**/ /**/ /**/ //////////////////////////////////////// /////////////// // Get a decryptor that uses the same key and IV as the encryptor. Icryptotransform decryptor = Rc2csp. createdecryptor (Key, IV ); // Now

(toencrypt,0,toencrypt.length);Csencrypt.flushfinalblock ();}catch (Exception err)... {throw new ApplicationException (err. message);}Finally... {Try... {Fout. Close ();Csencrypt.close ();}Catch... {;}}}Else... {throw new FileNotFoundException ("No specified file found");}}/**//**//**////Overloaded version of the file encryption function, if you do not specify an output path,Then the original file will be overwritten by the encrypted filepublic void EncryptFile (string filePath)... {This. Encry

1 //Symmetric encryption Helper class2 Public Static classCryptohelper3 {4 //For more information, refer to http://www.cnblogs.com/JimmyZhang/archive/2008/10/02/Cryptograph.html5 Private StaticICryptoTransform encryptor;//Crypto Object6 Private StaticICryptoTransform decryptor;//Decryption Object7 8 Private StaticSymmetricAlgorithm Provider = Symmetricalgorithm.create ("TripleDES");9 Ten Private Const

enumerated by cryptostreammode ), or read the ciphertext stream into the plaintext stream (decryption ). The following is a helper class I have compiled for encryption and decryption: Code Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--> // Symmetric encryption help class Public Class Cryptohelper { // Symmetric encryption algorithm provider Private Icryptotransform encryptor; // Encryptor object Private Icryptotra

); System.Security.Cryptography.AesManaged AES = new System.Security.Cryptography.AesManaged (); System.Security.Cryptography.Rfc2898DeriveBytes RFC = new System.Security.Cryptography.Rfc2898DeriveBytes (pwdvalue , salt); Aes. BlockSize = AES. Legalblocksizes[0]. MaxSize; Aes. KeySize = AES. Legalkeysizes[0]. MaxSize; Aes. Key = RfC. GetBytes (AES. KEYSIZE/8); AES.IV = RfC. GetBytes (AES. BLOCKSIZE/8); Creates a symmetric decryption object with the current Key property and initialization

(); Return convert.tobase64string (Encryptedstream.toarray ()); }//end Function static public string Symmetricdecrypt (string sencryptedtext) { Byte[] byteencrypted; MemoryStream Plaintextstream; ICryptoTransform decryptor; CryptoStream Thecryptostream; if (Sencryptedtext = = "") return ""; byteencrypted = convert.frombase64string (Sencryptedtext.trim ()); Plaintextstream = new MemoryStream (sencryptedtext.length);

disable the screen in various ways, so that the decryption cannot obtain any information returned by the tracing debugging software, to prevent the decryptor From deciphering the encryption system. This anti-tracking technology also has five types of implementation methods: (1) screen blocking: You can reset the screen features to set the foreground color and background color to the same color, so that the decrypted cannot see debugging information

[] signature;Asypolicricprovider. importparameters (sender_privatekey );Signature = asypolicricprovider. signdata (encrypted. toarray (), new sha1cryptoserviceprovider ());} The last output of the above four steps is encrypted, key, IV, and signature. DEMO code for decryption:1. Get the key...2. Verify the Digital Signature...{Asyuncricprovider. importparameters (sender_publickey );Bool verify = asypolicricprovider. verifydata (encrypted, new sha1cryptoserviceprovider (), signature)}3. decry

. Unicode. getbytes (inputtext );Passwordderivebytes secretkey = new passwordderivebytes (encryption_key, salt ); Using (icryptotransform encryptor = rijndaelcipher. createencryptor (secretkey. getbytes (32), secretkey. getbytes (16 ))){Using (memorystream = new memorystream ()){Using (cryptostream = new cryptostream (memorystream, encryptor, cryptostreammode. Write )){Cryptostream. Write (plaintext, 0, plaintext. Length );Cryptostream. flushfinalblock ();Return "? "+ Parameter_name + convert. t

DESCryptoServiceProvider ();Cryptoprovider.mode = CIPHERMODE.CBC;cryptoprovider.padding = Paddingmode.zeros;Try{Open up a memory stream and store the ciphertextusing (MemoryStream Memory = new MemoryStream (Data)){Wraps the memory stream object into an encrypted stream objectusing (CryptoStream decryptor = new CryptoStream (Memory,Cryptoprovider.createdecryptor (Bkey, Bvector),CryptoStreamMode.Read)){Clear Text Storage Areausing (MemoryStream origina