Uriel Cedillo
08 de Agosto del 2003

Estoy buscando algunos ejemplos de algoritmos DES para java, ¿Alguien tendra algunos links?

mdiomeda
08 de Agosto del 2003

ACA TE DEJO UN ALGORITMO ENVIADO POR LUPUS, ESPERO QUE TE SIRVA.

Re: Re: busco algoritmo de encriptacion
Enviado por Lupus el día 7 de abril de 2003
Aqui esta un pequeño ejemplo de como encriptar un password utilizando DES y MD5 con el JCE, espero y les sirva:

import java.io.*;
import java.security.*;
import javax.crypto.*;
import javax.crypto.spec.*;


public class PBEExample {

byte[] salt = { (byte)0xd4, (byte)0xa3, (byte)0xff, (byte)0x9e,
(byte)0x12, (byte)0xc7, (byte)0xd0, (byte)0x84 };

Cipher c;
PBEParameterSpec paramSpec;
SecretKey passwordKey;

public PBEExample(String password) {
try {
paramSpec = new PBEParameterSpec( salt, 20 );
PBEKeySpec keySpec = new PBEKeySpec( password.toCharArray() );
SecretKeyFactory kf = SecretKeyFactory.getInstance("PBEWithMD5AndDES");
passwordKey = kf.generateSecret( keySpec );
c = Cipher.getInstance("PBEWithMD5AndDES");
} catch (Exception e) {
System.out.println("PBEExample() caught exception '" + e +
"' with message '" + e.getMessage() + "'.");
e.printStackTrace();
}
}

public void encrypt(DataInputStream dis, DataOutputStream dos)
throws Exception {

c.init(Cipher.ENCRYPT_MODE, passwordKey, paramSpec);
CipherInputStream cis = new CipherInputStream( dis, c );

int i;
while ( (i = cis.read()) >= 0 ) {
dos.write(i);
}
}

public void decrypt(DataInputStream dis, DataOutputStream dos)
throws Exception {

c.init(Cipher.DECRYPT_MODE, passwordKey, paramSpec);
CipherInputStream cis = new CipherInputStream( dis, c );

int i;
while ( (i = cis.read()) >= 0 ) {
dos.write(i);
}

}

public static void main(String[] args) {

System.out.println("PBEample, A Password Based Encryptor.");
System.out.println("Example: PBEExample [e|d] [filename] [password]");

try {

FileInputStream fis = new FileInputStream( args[1] );
DataInputStream dis = new DataInputStream( fis );

FileOutputStream fos = new FileOutputStream( args[1] + "." +
args[0] );
DataOutputStream dos = new DataOutputStream( fos );

PBEExample pbe = new PBEExample( args[2] );

if ( args[0].equals("e") )
pbe.encrypt( dis, dos );
else if ( args[0].equals("d") )
pbe.decrypt( dis, dos );
else
System.out.println("Error, '" + args[0] +
"' is an invalid command");

dos.flush();
fos.flush();
fos.close();
fis.close();
} catch (Exception e) {
System.out.println("PBEExample.main() caught exception '" + e +
"' with message '" + e.getMessage() + "'.");
e.printStackTrace();
}

}


}