Encrypt/Decrypt a file

I would like to encrypt/decrypt a binary file (not text based) in FLEX 3.4 (AIR). I went through the forum, but I did not found any samples on how to do this. Any idea or help is appreciated.
Thanks in advanced.

Take a look at Crypto or ASCrypt3
http://code.google.com/p/as3crypto/
http://ascrypt3.riaforge.org/index.cfm

Similar Messages

Hi Freinds......How to Encrypt/Decrypt Text file in j2me

Hello friendz.,,
I m having problem with textfile exncryption decryption in j2me..
Can abybode tell me how to encrypt/decrypt Text file using J2ME API's.......
PLZ help me .......
Thanx in advance
regards,
Parag

http://www.mobilefish.com/developer/bouncycastle/bouncycastle.html
http://www-128.ibm.com/developerworks/library/j-midpds.html

Encrypt/Decrypt pdf files in adobe air applications

Hi Friends
I want to encrypt and decrypt pdf files in adobe air application. I tried it many ways but am not getting it right method.
Please help me this situation.

AFAIK, Adobe Acrobat has features to add security to pdf file, but as for decrypt pdf files, you need to give the password. For example, Adobe Acrobat 9 standard. Decrypting pdf seems not the issue of acrobat. You can find proper version of Acrobat to encrypt your file, whereas decrypt pdf document, you need to turn to a pdf password removing program to achieve that.

Encrypt & Decrypt XML files

Hi All,
I am new to the cryptography. I have one application which will transfer XML files from the machines which uses Windows/Java platform to the machines which uses Linux/C and also vice versa.
I want to encrypt the files before transfer and decrypt the files after transfer on both the sides. Is there a common technology for handling this? Any info? Thanks in adv.
-Bh_t_76

So, I thought of getting ideas from the people who
have already done similar work. I think the forums
are meant for that. The topic is too broad. The forums are normally for specific problems and your request requires at least one book as an answer.
If you know nothing about encryption then you need to find and read books on the subject. Not just Java books, but general encryption books. There are plenty out there of various standards.
One of the books in my library is http://www.schneier.com/book-applied.html but you may want to start with something a little less weighty. Visit http://www.crypteon.co.uk/cryptography-books.htm to get some ideas.
Once you have a basic understanding of modern cryptography then study the JCE tutorial and come back with specific questions.

Encrypt/decrypt same file with two different passwords

Hi everyone:
I'm quite new to Java and cryptography in general and have a theoretical question. Is the following scenario possible and how would it be implemented:
Two users with two passwords (say, a regular user and a superuser) encrypt, decrypt, read from and write to the same file. The secret key for encryption and decryption should be based on their passwords (generated from their passwords), i.e. not stored anywhere on the system.
I've been racking my brains but can't think of a way. Am I missing an obvious solution?
Can it be done?
Thanks,
Michael

I don't think you can avoid having more than just a password hash stored on the system. Using a combination of my approach and Jeff's approach I can implement this as long as you allow a password protected key store to be stored on each system. A given user's key store would contain his RSA private key and associated public key together with the admin user's RSA certificate (thought the admin user's public key could be stored in the program since it does not have to be kept private). The admin user's key store would contain only his RSA private and public keys.
Assume that the data file is to be create by a standard non-admin user. His code performs the following actions -
1) Generates a random symmetric algorithm key. Say a 128 bit AES key.
2) He write a digest of this to the output file.
3) He writes the random key encrypted with his public key to the file.
4) He writes his public key (or certificate) to the file.
5) He writes the random key encrypted with the admin users public key to the file.
6) He encrypts the data using the random key writes the result to the file.
This user can then update the file by
1) reading from the file the digest of the random key.
2) reading the random key encrypted with his public key.
3) Decrypting this encrypted random key using his private key extracted from his keystore.
4) Check the digest of this key to make sure he has the correct random key.
5) skipping his certificate and the random key encrypted using the admin user's public key.
5) Decrypting the data using the random key.
6) Update the data.
7) Re-encrypt the file as described in the first part using a new random key.
The admin user can
1) read from the file the digest of the random key.
2) skip the random key encrypted using the user's public key.
3) reading the user's public key from the file (for use later if the file needs to be updated).
4) read the random key encrypted using the admin's public key.
5) decrypting the random key using the admin's private key obtained from his key store.
6) check the digest of the random key to make sure it is correct.
7) decrypt the the data.
The admin can edit the data since he can re-encrypt the data in a similar manner to the way it was created in the first place.

How do I protect my FLV files? or How to encrypt and decrypt FLV files using AIR?

Hi,
I am working on an AIR application, which is developed on eLearning concept. The application mainly deals with flv files. The application contains a video player component, which will stream flv files from an Apache Server and played in my application. Here my concern is I would like to protect my flv files some how against users who may stream them from Apache Server and use them without my application.
I thought of with an idea to do it. But I don't know whether it will work or not. So I am requesting for your suggestions and better ways to do this with a sample.
Here is my thought:
I would like to place the encrypted FLV files at Apache Server side [ Need to know how to encrpt the FLV files using Flex]
As my AIR application send a request for a FLV file, the Apache server should send the decryption key and a stream of FLV file.
AIR application should take the decryption key, stream of flv file and it should capable enough to decrypt the FLV file and play it in my application. [ But I don't know how to encrypt/decrypt FLV files through flex]
I can do encryption of FLV files using Mac Address of Apache Server system and using Java. But I don't know how can I decrypt the same FLV file ( Encrypted using Mac Address and java ) at AIR application side.
So I would be greatfull If any body help me in encrypting and decrypting of FLV file with a sample using Flex 3.0.
Thanks
Sudheer Puppala

russellfromblackburn south wrote:
Is it because the portable drive is NTFS format and the Mac wont recognise this? If so what do I do?
Yes, this is exactly what is causing the problem. Macs cannot write to NTFS formatted drives, only read. You must move the documents to the internal HDD/SSD of the Mac to be able to edit them.
Or, since you say you don't want to move the documents to the internal storage, you'll need to format the external HDD as FAT32.

Decrypt video file(flv)??

Hello
I write program to encrypt / decrypt video file , for encryption I can write a code that give for example "film.flv" and store it every where that I want. but Ihave another code that decrypt that file and store it,but I want that have code
to decrypt for example encryption file and then execute it (with Process.Start("D:\\Mishael\\Documents\\Ikido.docx");).
how can write decrypt the encryption file without store and execute it.
all my code is :
class Class1
public const string stKey = "_?73^?dVT3st5har3";
public const string stSlatKey = "!25@LT&KT3st5har3EY";
public const int intIterations = 1024;
public byte[] slat;
public byte[] bytes;
public byte[] decslat;
public byte[] decbytes;
public byte[] GetBytes(string str)
bytes = new byte[str.Length * sizeof(char)];
Buffer.BlockCopy(str.ToCharArray(), 0, bytes, 0, bytes.Length);
return bytes;
//encryption video file and store it
public void EncryptFile(string stSrcFilename, string stDestFilename)
RijndaelManaged aes = new RijndaelManaged();
aes.BlockSize = aes.LegalBlockSizes[0].MaxSize;
aes.KeySize = aes.LegalKeySizes[0].MaxSize;
slat = GetBytes(stSlatKey);
Rfc2898DeriveBytes key = new Rfc2898DeriveBytes(stKey, slat, intIterations);
aes.Key = key.GetBytes(aes.KeySize / 8);
aes.IV = key.GetBytes(aes.BlockSize / 8);
aes.Mode = CipherMode.CBC;
ICryptoTransform transform = aes.CreateEncryptor(aes.Key, aes.IV);
using(FileStream dest = new FileStream(stDestFilename,FileMode.CreateNew,FileAccess.Write,FileShare.None))
using(CryptoStream cryptostream = new CryptoStream(dest,transform,CryptoStreamMode.Write))
using(FileStream source = new FileStream(stSrcFilename,FileMode.Open,FileAccess.Read,FileShare.Read))
//source.Copyto(cryptostream);
byte[] buf = new byte[4096];
int size = 0;
while ((size = source.Read(buf, 0, 4096)) > 0)
cryptostream.Write(buf, 0, size);
//I want to decrypt video(that encrypted without store and execute it)
public void decryptfilm(string srcFilename)
RijndaelManaged aes = new RijndaelManaged();
aes.BlockSize = aes.LegalBlockSizes[0].MaxSize;
aes.KeySize = aes.LegalKeySizes[0].MaxSize;
decslat = GetBytes(stSlatKey);
Rfc2898DeriveBytes key = new Rfc2898DeriveBytes(stKey, decslat, intIterations);
aes.Key = key.GetBytes(aes.KeySize / 8);
aes.IV = key.GetBytes(aes.BlockSize / 8);
aes.Mode = CipherMode.CBC;
ICryptoTransform transform = aes.CreateDecryptor(aes.Key, aes.IV);
using (FileStream dest = new FileStream(srcFilename,FileMode.Open, FileAccess.Read, FileShare.Read))
using (CryptoStream cryptostream = new CryptoStream(dest,transform,CryptoStreamMode.Read))
//StreamReader stread = new StreamReader(cryptostream);
//stread.ReadToEnd
//try
// using (FileStream source = new FileStream(srcFilename, FileMode.Open, FileAccess.Read, FileShare.Read))
// Process.Start(srcFilename);
//catch (CryptographicException exception)
// throw new ApplicationException("Decryption failed", exception);
}//decrypt video(that encrypted) and store it
public void DecryptFile(string srcFilename, string destFilename)
RijndaelManaged aes = new RijndaelManaged();
aes.BlockSize = aes.LegalBlockSizes[0].MaxSize;
aes.KeySize = aes.LegalKeySizes[0].MaxSize;
decslat = GetBytes(stSlatKey);
Rfc2898DeriveBytes key = new Rfc2898DeriveBytes(stKey, decslat, intIterations);
aes.Key = key.GetBytes(aes.KeySize / 8);
aes.IV = key.GetBytes(aes.BlockSize / 8);
aes.Mode = CipherMode.CBC;
ICryptoTransform transform = aes.CreateDecryptor(aes.Key, aes.IV);
using (FileStream dest = new FileStream(destFilename, FileMode.CreateNew, FileAccess.Write, FileShare.None))
using (CryptoStream cryptostream = new CryptoStream(dest, transform, CryptoStreamMode.Write))
try
using (FileStream source = new FileStream(srcFilename, FileMode.Open, FileAccess.Read, FileShare.Read))
byte[] buf = new byte[4096];
int size = 0;
while ((size = source.Read(buf, 0, 4096)) > 0)
cryptostream.Write(buf, 0, size);
catch (CryptographicException exception)
throw new ApplicationException("Decryption failed", exception);

how can write decrypt the encryption file without store and execute it.
Please don't post C code in the VB forum - it is very confusing. You can convert that code and update you post using a utility such as this:
http://converter.telerik.com/
If you decrypt your file without either storing it or executing it, then what will you do with the decrypted file? If you mean that you want to decrypt it and then execute it without storing it then that will depend on how you are executing it.
You can use a memory stream, but not with a viewer that you start as an external process.
https://msdn.microsoft.com/en-us/library/system.io.memorystream(v=vs.110).aspx

Encryption/Decryption failure for pdf and MSWord files

Hi,
Is there anybody to help me to find out what is wrong with my class (listing below)? I am sucessfuly using this class to encrypt and decrypt txt, html files but for unknown reasons I am unable to use it for e.g. pdf files. The encrypion somehow works but any atempt to decrypt is a failure.
/* This class accepts an input file, encrypts/decrypts it using DES algorithm and
writes the encrypted/decrypted output to an output file. DES is used in Cipher
Block Chaining mode with PKCS5Padding padding scheme. Note that DES is a symmetric
block cipher that uses 64-bit keys for encryption. A password of length no less
than 8 is to be passed to the encryptFile/ decryptFile methods. This password is
used to generate the encryption key. All exception handling is to be done by
calling methods. These exceptions are thrown by encryptFile/ decryptFile methods.
The input buffer is 64 bytes, 8 times the key size.
import java.io.*;
import javax.crypto.*;
import javax.crypto.spec.*;
import java.security.*;
import java.security.spec.*;
public class Crypto
public Crypto(FileInputStream inStream_, FileOutputStream outStream_)
fInputStream_ = inStream_;
fOutputStream_ = outStream_;
public void encryptFile(String password_) throws InvalidKeySpecException, InvalidKeyException,
InvalidAlgorithmParameterException, IllegalStateException, IOException, Exception
DataOutputStream dataOutStream_ = new DataOutputStream(fOutputStream_);
// key generation
SecretKey encryptKey_ = createEncryptionKey(password_);
// Cipher initialization
Cipher cipher_= Cipher.getInstance(cipherType);
cipher_.init(Cipher.ENCRYPT_MODE, encryptKey_);
// write initialization vector to output
byte[] initializationVector_ = cipher_.getIV();
dataOutStream_.writeInt(initializationVector_.length);
dataOutStream_.write(initializationVector_);
// start reading from input and writing encrypted data to output
while (true) {
inputLength_ = fInputStream_.read(input_);
if (inputLength_ ==-1) break;
byte[] output_ = cipher_.update(input_, inputOffset_, inputLength_);
if (output_ != null)
dataOutStream_.write(output_);
// finalize encryption and wrap up
byte[] output_ = cipher_.doFinal();
if (output_ != null)
dataOutStream_.write(output_);
fInputStream_.close();
dataOutStream_.flush();
dataOutStream_.close();
public void decryptFile(String password_) throws IllegalStateException, IOException, Exception
DataInputStream dataInStream_ = new DataInputStream(fInputStream_);
// key generation
SecretKey encryptKey_ = createEncryptionKey(password_);
// read initialization vector from input
int ivSize_ = dataInStream_.readInt();
byte[] initializationVector_ = new byte[ivSize_];
dataInStream_.readFully(initializationVector_);
IvParameterSpec ivParamSpec_= new IvParameterSpec(initializationVector_);
// Cipher initialization
Cipher cipher_= Cipher.getInstance("DES/CBC/PKCS5Padding");
cipher_.init(Cipher.DECRYPT_MODE, encryptKey_, ivParamSpec_);
// start reading from input and writing decrypted data to output
while (true) {
inputLength_ = fInputStream_.read(input_);
if (inputLength_ ==-1) break;
byte[] output_ = cipher_.update(input_, inputOffset_, inputLength_);
if (output_ != null)
fOutputStream_.write(output_);
// finalize decryption and wrap up
byte[] output_ = cipher_.doFinal();
if (output_ != null)
fOutputStream_.write(output_);
fInputStream_.close();
fOutputStream_.flush();
fOutputStream_.close();
// the following method creates the encryption key using the supplied password
private SecretKey createEncryptionKey(String passwd_) throws InvalidKeySpecException,
InvalidKeyException, NoSuchAlgorithmException
byte[] encryptionKeyData_ = passwd_.getBytes();
DESKeySpec encryptionKeySpec_ = new DESKeySpec(encryptionKeyData_);
SecretKeyFactory keyFactory_ = SecretKeyFactory.getInstance(algorithm_);
SecretKey encryptionKey_ = keyFactory_.generateSecret(encryptionKeySpec_);
return encryptionKey_;
private FileInputStream fInputStream_;
private FileOutputStream fOutputStream_;
private final String algorithm_= "DES";
private final String cipherType= "DES/CBC/PKCS5Padding";
private byte[] input_ = new byte[64]; // The input buffer size is 64
private int inputLength_;
private final int inputOffset_= 0;
}

Please can u give me refined code for me///
at [email protected]
Hi,
I found at least one thing wrong. In the decrypt
method you are reading from 'fInputStream_' rather
than 'dataInStream'.
Worked for me on MSWord after changing this!
Roger
// start reading from input and writing decrypted
ted data to output
while (true) {
inputLength_ = fInputStream_.read(input_);
if (inputLength_ ==-1) break;
byte[] output_ = cipher_.update(input_,
input_, inputOffset_, inputLength_);
if (output_ != null)
fOutputStream_.write(output_);

Help needed in encrypting and decrypting a file

Hello,
I just started looking into the Java Security.I need to encrypt a file using any popular alogrithm like RSA or DES and write it to disk.and again decrypt this file at a later time when needed.
I was checking out with different ways of doing so,but found it difficult to persist the key some where.
Could some one help me in this regard,with a tutorial or a sample program where I will be able to give cleartext file as an input and get a ciphered text file as output and vice versa?

Probably the simplest solution is to use password-based encryption (PBE). See http://java.sun.com/j2se/1.5.0/docs/guide/security/CryptoSpec.html#PBEEx
for an example.

PDF Encryption using CONTROL File in EBIZ R12 & Decrypting the PDF

Hi All,
We are using BI Publisher BURSTING with R12 ebiz.
We have a requirement to encrypt the file while generating to the filesystem.Then when viewing the File from OAF they went to decrypt before showing to the user.
As per the Documentation , there are some attributes like pdf-security and encryption level .
a) Can we set these attributes in control file while using with R12 ? Is there any documentation available for the same ?
b) Once we encrypt the file , Can we decrypt the file also , any documentation available for the same ??
Regards,
Vamsee.

I can't recommend a solution for that. Tell your management team that this is unnecessary. The file system should be secure, if it's not someone on your unix admin team is in big trouble......
I mean based on that logic all output files should be secured. By the way OAF is secure too so this really unnecessary as well. If the files need to be secured by a particular user, encryption is still a bad idea. You should just generate a relevant report for the user. Thats how we do security in the apps my friend.

Sum Encrypt does not recognize a copy of a file through linux. How decrypt this file with Sum Encrypt?

Sum Encrypt does not recognize a copy of a file through linux to Mac 0S9. How decrypt this file with Sum Encrypt?

Hello, and welcome to Apple Support Communities!
I am not familiar with the program that you list, however files in OS 9 use things called Resource Forks (rather than file extensions) for filetype and creator.
If you sent a file through Linux these resource forks probably got stripped and now the file is nothing to your Macintosh.
It is best to BinHex your files (.hqx) before leaving the HFS file system so that their resource forks are preserved.
Regards,
Ryan

Encryption/decryption through jar file and classes

Hi,
My application uses tomcat as web server.
I am doing encrytion and decyption.
i fetch encypted data from database and then decrypt it
If i use calsses in webapps -> WEB-INF -> classes folder, i place classes in that ,
In other case i use jar file and place that file in WEB-INF -> lib folder in the webapps directory.
There is huge performance difference.
While using classes performance is great while using jar file performance is very disappointed.
I am using a file for encryption /decryption also.

Are you getting any error messages? Have you put debugging code in those classes to see what is happening?

Best method for encrypting/decrypting large XML files ( 100MB)

I am in need of encrypting XML for large part files that can get upwards of 100Mb+.
I found some articles and code, but the only example I was successful in getting to work used XMLCipher, which takes a Document, parses it, and then encrypts it.
Obviously, 100Mb files do not cooperate well with DOM, so I want to find a better method for encryption/decryption of these files.
I found some articles using a CipherInputStream and CipherOutputStreams, but am not clear if this is the way to go and if this will avoid memory errors.
import java.io.*;
import java.security.spec.AlgorithmParameterSpec;
import javax.crypto.*;
import javax.crypto.spec.IvParameterSpec;
public class DesEncrypter {
    Cipher ecipher;
    Cipher dcipher;
    public DesEncrypter(SecretKey key) {
        // Create an 8-byte initialization vector
        byte[] iv = new byte[]{
            (byte)0x8E, 0x12, 0x39, (byte)0x9C,
            0x07, 0x72, 0x6F, 0x5A
        AlgorithmParameterSpec paramSpec = new IvParameterSpec(iv);
        try {
            ecipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
            dcipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
            // CBC requires an initialization vector
            ecipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);
            dcipher.init(Cipher.DECRYPT_MODE, key, paramSpec);
        } catch (java.security.InvalidAlgorithmParameterException e) {
        } catch (javax.crypto.NoSuchPaddingException e) {
        } catch (java.security.NoSuchAlgorithmException e) {
        } catch (java.security.InvalidKeyException e) {
    // Buffer used to transport the bytes from one stream to another
    byte[] buf = new byte[1024];
    public void encrypt(InputStream in, OutputStream out) {
        try {
            // Bytes written to out will be encrypted
            out = new CipherOutputStream(out, ecipher);
            // Read in the cleartext bytes and write to out to encrypt
            int numRead = 0;
            while ((numRead = in.read(buf)) >= 0) {
                out.write(buf, 0, numRead);
            out.close();
        } catch (java.io.IOException e) {
    public void decrypt(InputStream in, OutputStream out) {
        try {
            // Bytes read from in will be decrypted
            in = new CipherInputStream(in, dcipher);
            // Read in the decrypted bytes and write the cleartext to out
            int numRead = 0;
            while ((numRead = in.read(buf)) >= 0) {
                out.write(buf, 0, numRead);
            out.close();
        } catch (java.io.IOException e) {
}This looks like it might fit, but there is one more twist, I am using a persistence manager and xml encoding to accomplish that, so I am not sure how (where) to implement this method without affecting persistence.
Any guidance on what would work best in this situation would be appreciated.
Regards,
vbplayr2000

I can give some general guidelines that might help, having done much similar work:
You have 2 different issues, at least from my reading of your problem:
1) How to deal with large XML docs that most parsers will not handle without memory issues
2) Where to hide or "black box" the encrypt/decrypt routines
#1: Check into XPP3/XMLPull. Yes, it's different that the other XML parsers you are used to using, and more work is involved, but it is blazing fast and can be used to parse a stream as it is being read. You can populate beans and process as needed since there is really not much "inversion of control" involved compared to parsers that go on to finish the entire document or load it all into memory.
#2: Extend Serializable and write your own readObject/writeObject methods. Place the encrypt/decrypt in there as appropriate. That will "hide" the implementation and should be what any persistence manager can deal with.
Regards,
antarti

Getting Error while decrypt a file using Blowfish algorithm

I am using blowfish algorithm for encrypt and decrypt my file. this is my code for encrypting decrypting .
while i am running program i am getting an Exception
Exception in thread "main" javax.crypto.BadPaddingException: Given final block not properly padded
at com.sun.crypto.provider.SunJCE_h.b(DashoA6275)
at com.sun.crypto.provider.SunJCE_h.b(DashoA6275)
at com.sun.crypto.provider.BlowfishCipher.engineDoFinal(DashoA6275)
at javax.crypto.Cipher.doFinal(DashoA12275)
at Blowfishexe.main(Blowfishexe.java:65)
import java.security.*;
import javax.crypto.*;
import javax.crypto.spec.*;
import java.io.*;
import org.bouncycastle.crypto.CryptoException;
import org.bouncycastle.crypto.KeyGenerationParameters;
import org.bouncycastle.crypto.engines.DESedeEngine;
import org.bouncycastle.crypto.generators.DESedeKeyGenerator;
import org.bouncycastle.crypto.modes.CBCBlockCipher;
import org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher;
import org.bouncycastle.crypto.params.DESedeParameters;
import org.bouncycastle.crypto.params.KeyParameter;
import org.bouncycastle.util.encoders.Hex;
public class Blowfishexe {
public static void main(String[] args) throws Exception {
KeyGenerator kgen = KeyGenerator.getInstance("Blowfish");
          kgen.init(128);
          String keyfile="C:\\Encryption\\BlowfishKey.dat";
SecretKey skey = kgen.generateKey();
byte[] raw = skey.getEncoded();
SecretKeySpec skeySpec = new SecretKeySpec(raw, "Blowfish");
          System.out.println("key"+raw);
               byte[] keyBytes = skey.getEncoded();
               byte[] keyhex = Hex.encode(keyBytes);
               BufferedOutputStream keystream =
new BufferedOutputStream(new FileOutputStream(keyfile));
                    keystream.write(keyhex, 0, keyhex.length);
keystream.flush();
keystream.close();
Cipher cipher = Cipher.getInstance("Blowfish");
cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
          System.out.println("secretKey"+skeySpec);
FileOutputStream fos=new FileOutputStream("C:\\Encryption\\credit11.txt");
          BufferedReader br=new BufferedReader(new FileReader("C:\\Encryption\\credit.txt"));
          String text=null;
          byte[] plainText=null;
          byte[] cipherText=null;
          while((text=br.readLine())!=null)
          System.out.println(text);
          plainText = text.getBytes();
          cipherText = cipher.doFinal(plainText);
          fos.write(cipherText);
          br.close();
          fos.close();
          cipher.init(Cipher.DECRYPT_MODE, skeySpec);
          FileOutputStream fos1=new FileOutputStream("C:\\Encryption\\BlowfishOutput.txt");
          BufferedReader br1=new BufferedReader(new FileReader("C:\\Encryption\\credit11.txt"));
          String text1=null;
          /*while((text1=br1.readLine())!=null)
               System.out.println("text is"+text1);
               plainText=text1.getBytes("UTF8");
               cipherText=cipher.doFinal(plainText);
               fos1.write(cipherText);
          br1.close();
          fos1.close();
//byte[] encrypted = cipher.doFinal("This is just an example".getBytes());
          //System.out.println("encrypted value"+encrypted);*/
Any one pls tell me how to slove my problem
thanks in advance

hi
i got the solution. its working now
but blowfish key ranges from 56 to448
while i am writing the code as
KeyGenerator keyGenerator = KeyGenerator.getInstance("Blowfish");
keyGenerator.init(448);
this code is generating the key upto 448 bits
but coming to encoding or decode section key length is not accepting
cipher.init(Cipher.ENCRYPT_MODE, key);
Exception in thread "main" java.security.InvalidKeyException: Illegal key size or default parameters
at javax.crypto.Cipher.a(DashoA12275)
at javax.crypto.Cipher.a(DashoA12275)
at javax.crypto.Cipher.a(DashoA12275)
at javax.crypto.Cipher.init(DashoA12275)
at javax.crypto.Cipher.init(DashoA12275)
at Blowfish1.main(Blowfish1.java:46)
i am getting this error
what is the solution for this type of exception.
thank you

How to resolve bug RC4 encrypt-decrypt on iPAD with AIR15 only

Hi everybody,
I have some trouble with AIR15 only, In the past, I created a small game on iPad It could send or receive messge from server. I used lib as3crypto.swc encrypt or decrypt message (RC4). But when I upgrade to AIR15 encrypt-decrypt cannot work ( Another thing about this crash is that it only happens with a release (adhoc or appstore) build but NOT with a debug build). I check so many time but i don't know what is problem here.
Please help me, thanks so much any advice.
P/S: My game have many swf files (code and resource). I must combine multiple SWF files into one.
Class RC4.as
import com.hurlant.crypto.prng.ARC4;
import com.hurlant.util.Base64;
import com.hurlant.util.Hex;
import flash.utils.ByteArray;
public class RC4
private static const key:String = "keytest";
private static var byteKeys:ByteArray = Hex.toArray(Hex.fromString(key));
private static var rc4:ARC4 = new ARC4();
public static function encrypt(clearText:String):String
var byteText:ByteArray = Hex.toArray(Hex.fromString(clearText));
rc4.init(byteKeys);
rc4.encrypt(byteText);
return Base64.encodeByteArray(byteText);
public static function decrypt(encryptedText:String):String
var byteText:ByteArray = Base64.decodeToByteArray(encryptedText);
rc4.init(byteKeys);
rc4.decrypt(byteText);
return Hex.toString(Hex.fromArray(byteText));

Sorry, exact message is "this movie could not be played".
There are hundreds of posts about this message but no one states a clear solution to the problem.
Your help will be much appreciated.
Thank you.

Encrypt/Decrypt a file

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