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Simple encrypt/decrypt util for url parameters
package lv.org.substance.crypt
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 org.apache.commons.codec.binary.Base64;
public class EncryptionUtil
{
// some random salt
private static final byte[] SALT = { (byte) 0x21, (byte) 0x21, (byte) 0xF0, (byte) 0x55, (byte) 0xC3, (byte) 0x9F, (byte) 0x5A, (byte) 0x75 };
private final static int ITERATION_COUNT = 31;
private EncryptionUtil()
{
}
public static String encode(String input)
{
if (input == null)
{
throw new IllegalArgumentException();
}
try
{
KeySpec keySpec = new PBEKeySpec(null, SALT, ITERATION_COUNT);
AlgorithmParameterSpec paramSpec = new PBEParameterSpec(SALT, ITERATION_COUNT);
SecretKey key = SecretKeyFactory.getInstance("PBEWithMD5AndDES").generateSecret(keySpec);
Cipher ecipher = Cipher.getInstance(key.getAlgorithm());
ecipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);
byte[] enc = ecipher.doFinal(input.getBytes());
String res = new String(Base64.encodeBase64(enc));
// escapes for url
res = res.replace('+', '-').replace('/', '_').replace("%", "%25").replace("\n", "%0A");
return res;
}
catch (Exception e)
{
}
return "";
}
public static String decode(String token)
{
if (token == null)
{
return null;
}
try
{
String input = token.replace("%0A", "\n").replace("%25", "%").replace('_', '/').replace('-', '+');
byte[] dec = Base64.decodeBase64(input.getBytes());
KeySpec keySpec = new PBEKeySpec(null, SALT, ITERATION_COUNT);
AlgorithmParameterSpec paramSpec = new PBEParameterSpec(SALT, ITERATION_COUNT);
SecretKey key = SecretKeyFactory.getInstance("PBEWithMD5AndDES").generateSecret(keySpec);
Cipher dcipher = Cipher.getInstance(key.getAlgorithm());
dcipher.init(Cipher.DECRYPT_MODE, key, paramSpec);
byte[] decoded = dcipher.doFinal(dec);
String result = new String(decoded);
return result;
}
catch (Exception e)
{
// use logger in production code
e.printStackTrace();
}
return null;
}
}
@sufHub

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sufHub commented Nov 26, 2013

Thanks !

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