converting SecretKey to String and String to SecretKey
In my client server program i tried to encrypt the message using SecretKey object ,using DES. simply for a trial i sent this key(encryption key) also on other end in the string format for decryption. now on the other end for decryption the init() is not accepting this key as it takes only the secretkey object. how to convert this key form string to Secretkey so that i'l be able to decrypt the message?
plz help. i need ur help. my e-mail id is jenniekiro@yahoo.com
[482 byte] By [
trewqya] at [2007-11-26 15:27:03]
# 2
//server side
//encryption key generation
KeyGenerator kg=KeyGenerator.getInstance("DES");
SecretKey key1 = kg.generateKey();
System.out.println("Random Key for encryption is:"+key1);
PrintWriter p=new PrintWriter(s.getOutputStream(),true);
p.println(key1);
//generating random key to be encrypted and to be sent
SecretKey key2 = KeyGenerator.getInstance("DES").generateKey();
System.out.println("the random KEY to be encrypted:"+key2);
String st=String.valueOf(key2);
byte[] kee = st.getBytes();
byte[] initVector = new byte[] { 0x10, 0x10, 0x01, 0x04, 0x01, 0x01, 0x01, 0x02 };
AlgorithmParameterSpec algParamSpec = new IvParameterSpec(initVector);
Cipher m_encrypter = Cipher.getInstance("DES/CBC/PKCS5Padding");
Cipher m_decrypter = Cipher.getInstance("DES/CBC/PKCS5Padding");
m_encrypter.init(Cipher.ENCRYPT_MODE, key1, algParamSpec);
m_decrypter.init(Cipher.DECRYPT_MODE, key1, algParamSpec);
//SENDING
byte[] encryptedText = m_encrypter.doFinal(kee);
String st1=new String(encryptedText);
System.out.println("\n Encrypted text : "+st1);
PrintWriter pout1=new PrintWriter(s.getOutputStream(),true);
pout1.println(st1);
//Client side
//RECEIVING the Key for decryption
BufferedReader b2=new BufferedReader(new
InputStreamReader(s.getInputStream()));
String s1=b2.readLine();
System.out.println("Secret encryption Key from user A received is :
"+s1);
//I don't know this part how to do? so tried with bytes.
SecretKey kee=SecretKey.valueOf(s1);
byte[] kee=s1.getBytes();
System.out.println("key in byte is:"+kee);
//its showing the error in init()
byte[] initVector = new byte[] { 0x10, 0x10, 0x01, 0x04, 0x01,
0x01, 0x01, 0x02 };
AlgorithmParameterSpec algParamSpec = new
IvParameterSpec(initVector);
Cipher m_encrypter =
Cipher.getInstance("DES/CBC/PKCS5Padding");
Cipher m_decrypter =
Cipher.getInstance("DES/CBC/PKCS5Padding");
m_encrypter.init(Cipher.ENCRYPT_MODE,kee, algParamSpec);
System.out.println("test2");
m_decrypter.init(Cipher.DECRYPT_MODE, kee, algParamSpec);
//Receiving the encrypted key
BufferedReader br2=new BufferedReader(new
InputStreamReader(s.getInputStream()));
String str1=br2.readLine();
System.out.println("Secret encrypted Key from user A received is :
"+str1);
byte[] tx=str1.getBytes();
byte[] decryptedText = m_decrypter.doFinal(tx);
System.out.println("Decrypted Data is:");
System.out.println(new String(decryptedText));
