Enjoy!!!
following are the two classess for encrypting and decrypting. Define a key(write
anything abc342d) in key.txt. Data which needs to be encrypted in data.txt. the
encrypted data will be written in encrypted.txt when you will run the program. Same
for decryption. You can modify the classes if you data is coming from somewhere and
going somewhere instead of .txt files.
//EncryptUser.java
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.security.Key;
import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.spec.SecretKeySpec;
public class EncryptUser {
public static void main(String[] args) {
try {
FileInputStream fiskey = new FileInputStream("key.txt");
byte[] byteData = new byte[8];
fiskey.read(byteData);
fiskey.close();
SecretKeySpec secretKey = new SecretKeySpec(byteData, "DES");
Key mykey = secretKey;
// initialize the Cipher objects
Cipher cipher = Cipher.getInstance("DES", "SunJCE");
cipher.init(Cipher.ENCRYPT_MODE, mykey);
// creating the encrypting cipher stream
FileInputStream fis = new FileInputStream("data.txt");
CipherInputStream cis = new CipherInputStream(fis, cipher);
// writing the encrypted data to output file
FileOutputStream fos = new FileOutputStream("encrypted.txt");
byteData = new byte[1024];
int intValue = 0;
while ((intValue = cis.read(byteData)) != -1) {
fos.write(byteData, 0, intValue);
}
fis.close();
fos.close();
cis.close();
} catch (Exception exp) {
exp.printStackTrace();
}
}
}
//DecryptUser.java
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.security.Key;
import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.spec.SecretKeySpec;
public class DecryptUser {
public static void main(String[] args) {
try {
FileInputStream fiskey = new FileInputStream("key.txt");
byte[] byteData = new byte[8];
fiskey.read(byteData);
fiskey.close();
SecretKeySpec secretKey = new SecretKeySpec(byteData, "DES");
Key mykey = secretKey;
// initialize the Cipher objects
Cipher cipher = Cipher.getInstance("DES", "SunJCE");
cipher.init(Cipher.DECRYPT_MODE, mykey);
// creating the encrypting cipher stream
FileInputStream fis = new FileInputStream("encrypted.txt");
CipherInputStream cis = new CipherInputStream(fis, cipher);
// writing the encrypted data to output file
FileOutputStream fos = new FileOutputStream("decrypted.txt");
byteData = new byte[1024];
int intValue = 0;
while ((intValue = cis.read(byteData)) != -1) {
fos.write(byteData, 0, intValue);
}
fos.close();
cis.close();
} catch (Exception exp) {
exp.printStackTrace();
}
}
}
-----Original Message-----
From: srinivas tadikonda [mailto:[EMAIL PROTECTED]]
Sent: Thursday, July 04, 2002 2:08 PM
To: [EMAIL PROTECTED]
Subject: Password encryption
Hi,
How can I do password encryption and decryption. Please sned code for encryption and
decryption.
Regards
Srinivas
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