Encrypting with DES Using a Pass Phrase
import java.security.spec.AlgorithmParameterSpec;
import java.security.spec.KeySpec;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
class DesEncrypter {
Cipher ecipher;
Cipher dcipher;
byte[] salt = { (byte) 0xA9, (byte) 0x9B, (byte) 0xC8, (byte) 0x32, (byte) 0x56, (byte) 0x35,
(byte) 0xE3, (byte) 0x03 };
DesEncrypter(String passPhrase) throws Exception {
int iterationCount = 2;
KeySpec keySpec = new PBEKeySpec(passPhrase.toCharArray(), salt, iterationCount);
SecretKey key = SecretKeyFactory.getInstance("PBEWithMD5AndDES").generateSecret(keySpec);
ecipher = Cipher.getInstance(key.getAlgorithm());
dcipher = Cipher.getInstance(key.getAlgorithm());
AlgorithmParameterSpec paramSpec = new PBEParameterSpec(salt, iterationCount);
ecipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);
dcipher.init(Cipher.DECRYPT_MODE, key, paramSpec);
}
public String encrypt(String str) throws Exception {
return new BASE64Encoder().encode(ecipher.doFinal(str.getBytes()));
}
public String decrypt(String str) throws Exception {
return new String(dcipher.doFinal(new BASE64Decoder().decodeBuffer(str)));
}
}
public class Main {
public static void main(String[] argv) throws Exception {
DesEncrypter encrypter = new DesEncrypter("My Pass Phrase!");
String encrypted = encrypter.encrypt("Don't tell anybody!");
String decrypted = encrypter.decrypt(encrypted);
}
}
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