i developing image encrypting program. have got 2 applications. 1 of them, converting image byte array , encrypting rijndael. after saving encrypted byte array file. second application decrypting. reading byte array file. after decrypt , show image in picturebox.
but geting "padding invalid , cannot removed." error in decryption application.
now saving encrypted byte array file code (i not sure true way byte array file ?);
protected bool savedata(string filename, byte[] data) { binarywriter writer = null; try { // create new stream write file writer = new binarywriter(file.open(filename,filemode.openorcreate)); // writer raw data writer.write(data); writer.flush(); writer.close(); } catch { return false; } return true; } i giving method save file location , encrypted byte array. , worked. dont know, correct way ?
and decryption application reading encrypted byte array file method;
protected byte[] getdata(string filename) { fileinfo f = new fileinfo(filename); binaryreader br = new binaryreader(file.open(filename, filemode.open)); byte[] = br.readbytes(convert.toint32(f.length)); return a; } and error location decryption method;
public static byte[] decryptbytes(byte[] encryptedbytes, string passphrase, string saltvalue) { rijndaelmanaged rijndaelcipher = new rijndaelmanaged(); rijndaelcipher.mode = ciphermode.cbc; byte[] salt = encoding.ascii.getbytes(saltvalue); passwordderivebytes password = new passwordderivebytes(passphrase, salt, "sha1", 2); icryptotransform decryptor = rijndaelcipher.createdecryptor(password.getbytes(32), password.getbytes(16)); memorystream memorystream = new memorystream(encryptedbytes); cryptostream cryptostream = new cryptostream(memorystream, decryptor, cryptostreammode.read); byte[] plainbytes = new byte[encryptedbytes.length]; int decryptedcount = cryptostream.read(plainbytes, 0, plainbytes.length); // getting error line. padding invalid , cannot removed. memorystream.flush(); cryptostream.flush(); memorystream.close(); cryptostream.close(); return plainbytes; } encryption code
public static byte[] encryptbytes(byte[] inputbytes, string passphrase, string saltvalue) { rijndaelmanaged rijndaelcipher = new rijndaelmanaged(); rijndaelcipher.mode = ciphermode.cbc; byte[] salt = encoding.ascii.getbytes(saltvalue); passwordderivebytes password = new passwordderivebytes(passphrase, salt, "sha1", 2); icryptotransform encryptor = rijndaelcipher.createencryptor(password.getbytes(32), password.getbytes(16)); memorystream memorystream = new memorystream(); cryptostream cryptostream = new cryptostream(memorystream, encryptor, cryptostreammode.write); cryptostream.write(inputbytes, 0, inputbytes.length); cryptostream.flushfinalblock(); byte[] cipherbytes = memorystream.toarray(); memorystream.close(); cryptostream.close(); return cipherbytes; } full code decryption application
namespace imagedecrypte { public partial class form1 : form { public form1() { initializecomponent(); } private string encpass; private string line; private string okunanveri; private byte[] sifrelidosyadizi; private byte[] cozulmusdosyadizi; private const string saltpass = "codework"; private string sfre; private string dyol; private void button1_click(object sender, eventargs e) { openfiledialog file = new openfiledialog(); file.filter = "Şifrelenmiş dosyalar (*.cw)|*.cw"; file.filterindex = 2; file.restoredirectory = true; file.checkfileexists = false; file.title = "Şifrelenmiş dosya seçiniz.."; file.initialdirectory = environment.getfolderpath(environment.specialfolder.desktop); if (file.showdialog() == dialogresult.ok) { dyol = file.filename; string dosyaadi = file.safefilename; label1.text = dosyaadi; sfre = textbox1.text; } } private void button2_click(object sender, eventargs e) { sfre = textbox1.text; sifrelidosyadizi = getdata(dyol); cozulmusdosyadizi = decryptbytes(sifrelidosyadizi, sfre, saltpass); picturebox1.image = bytearraytoimage(cozulmusdosyadizi); } public static byte[] decryptbytes(byte[] encryptedbytes, string passphrase, string saltvalue) { rijndaelmanaged rijndaelcipher = new rijndaelmanaged(); rijndaelcipher.mode = ciphermode.cbc; byte[] salt = encoding.ascii.getbytes(saltvalue); passwordderivebytes password = new passwordderivebytes(passphrase, salt, "sha1", 2); icryptotransform decryptor = rijndaelcipher.createdecryptor(password.getbytes(32), password.getbytes(16)); memorystream memorystream = new memorystream(encryptedbytes); cryptostream cryptostream = new cryptostream(memorystream, decryptor, cryptostreammode.read); byte[] plainbytes = new byte[encryptedbytes.length]; int decryptedcount = cryptostream.read(plainbytes, 0, plainbytes.length); memorystream.flush(); cryptostream.flush(); memorystream.close(); cryptostream.close(); return plainbytes.take(decryptedcount).toarray(); } public image bytearraytoimage(byte[] bytearrayin) { memorystream ms = new memorystream(bytearrayin); image returnimage = image.fromstream(ms); return returnimage; } //file byte array ################################################################### protected byte[] getdata(string filename) { fileinfo f = new fileinfo(filename); binaryreader br = new binaryreader(file.open(filename, filemode.open)); byte[] = br.readbytes(convert.toint32(f.length)); return a; } //file byte array ################################################################### } } full code encryption application
namespace imageencrypte { public partial class form1 : form { public form1() { initializecomponent(); } private string encpass; private byte[] bytearrayforimage; private byte[] bytearraycoded; private const string saltpass = "codework"; private void button1_click(object sender, eventargs e) { openfiledialog file = new openfiledialog(); file.filter = "jpeg dosyası |*.jpg| png dosyası|*.png"; file.filterindex = 2; file.restoredirectory = true; file.checkfileexists = false; file.title = "bir İmaj dosyası seçiniz.."; file.initialdirectory = environment.getfolderpath(environment.specialfolder.desktop); encpass = textbox1.text; if (file.showdialog() == dialogresult.ok) { string dosyayolu = file.filename; string dosyaadi = file.safefilename; label1.text = dosyaadi; image img = image.fromfile(dosyayolu); picturebox1.image = img; bytearrayforimage = imagetobytearray(img); bytearraycoded = encryptbytes(bytearrayforimage, encpass, saltpass); } } private void button2_click(object sender, eventargs e) { savefiledialog sf = new savefiledialog(); sf.title = "Şifrelenmiş dosyayı kaydet"; sf.checkfileexists = false; sf.checkpathexists = true; sf.restoredirectory = true; sf.defaultext = "cw"; sf.filename = "encodedfile"; sf.supportmultidottedextensions = false; sf.filter = "Şifrelenmiş dosyalar (*.cw)|*.cw"; sf.initialdirectory = environment.getfolderpath(environment.specialfolder.desktop); if (sf.showdialog() == dialogresult.ok) { string dosyayolu = sf.filename; bool cevap = savedata(dosyayolu, bytearraycoded); if (cevap) { messagebox.show("ok"); } else { messagebox.show("problem"); } } } //image byte array #################################################################### public byte[] imagetobytearray(system.drawing.image imagein) { using (var ms = new memorystream()) { imagein.save(ms, system.drawing.imaging.imageformat.gif); return ms.toarray(); } } //image byte array #################################################################### //byte array file ################################################################### protected bool savedata(string filename, byte[] data) { binarywriter writer = null; try { // create new stream write file writer = new binarywriter(file.open(filename,filemode.openorcreate)); // writer raw data writer.write(data); writer.flush(); writer.close(); } catch { return false; } return true; } //bytte array file ################################################################### //encryptbytes ################################################################### public static byte[] encryptbytes(byte[] inputbytes, string passphrase, string saltvalue) { rijndaelmanaged rijndaelcipher = new rijndaelmanaged(); rijndaelcipher.mode = ciphermode.cbc; byte[] salt = encoding.ascii.getbytes(saltvalue); passwordderivebytes password = new passwordderivebytes(passphrase, salt, "sha1", 2); icryptotransform encryptor = rijndaelcipher.createencryptor(password.getbytes(32), password.getbytes(16)); memorystream memorystream = new memorystream(); cryptostream cryptostream = new cryptostream(memorystream, encryptor, cryptostreammode.write); cryptostream.write(inputbytes, 0, inputbytes.length); cryptostream.flushfinalblock(); byte[] cipherbytes = memorystream.toarray(); memorystream.close(); cryptostream.close(); return cipherbytes; } //encryptbytes ################################################################### } } what can before going crazy man ? thank , waiting precious answers.
thanks maximilian gerhardt solution here;
public static byte[] encryptbytes(byte[] inputbytes, string passphrase, string saltvalue) { rijndaelmanaged rijndaelcipher = new rijndaelmanaged(); rijndaelcipher.mode = ciphermode.cbc; rijndaelcipher.padding = paddingmode.pkcs7; byte[] salt = encoding.utf32.getbytes(saltvalue); //byte[] salt = encoding.ascii.getbytes(saltvalue); passwordderivebytes password = new passwordderivebytes(passphrase, salt, "sha1", 2); icryptotransform encryptor = rijndaelcipher.createencryptor(password.getbytes(32), password.getbytes(16)); memorystream memorystream = new memorystream(); cryptostream cryptostream = new cryptostream(memorystream, encryptor, cryptostreammode.write); cryptostream.write(inputbytes, 0, inputbytes.length); cryptostream.flushfinalblock(); cryptostream.flush(); byte[] cipherbytes = memorystream.toarray(); memorystream.close(); cryptostream.close(); return cipherbytes; } public static byte[] decryptbytes(byte[] encryptedbytes, string passphrase, string saltvalue) { rijndaelmanaged rijndaelcipher = new rijndaelmanaged(); rijndaelcipher.mode = ciphermode.cbc; rijndaelcipher.padding = paddingmode.pkcs7; byte[] salt = encoding.utf32.getbytes(saltvalue); //byte[] salt = encoding.ascii.getbytes(saltvalue); passwordderivebytes password = new passwordderivebytes(passphrase, salt, "sha1", 2); icryptotransform decryptor = rijndaelcipher.createdecryptor(password.getbytes(32), password.getbytes(16)); memorystream memorystream = new memorystream(encryptedbytes); cryptostream cryptostream = new cryptostream(memorystream, decryptor, cryptostreammode.read); byte[] plainbytes = new byte[encryptedbytes.length]; int decryptedcount = cryptostream.read(plainbytes, 0, plainbytes.length); memorystream.flush(); cryptostream.flush(); memorystream.close(); cryptostream.close(); return plainbytes.take(decryptedcount).toarray(); } public static byte[] getdata(string filename) { return file.readallbytes(filename); } protected bool savedata(string filename, byte[] data) { try { file.writeallbytes(filename, data); return true; } catch { return false; } } 
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