쿠키를 암호화하는 예 ( Java Cookie Encryption example )
Java Keystore 로부터 키를 로드하는 방법을 참고하려면 이 링크를 클릭하세요
AES 알고리듬을 자바에서 사용하여 암호화/복호화하는 예는 여기를 참조하세요
import java.util.logging.Logger;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;
/* 원문참조:http://www.java2s.com/Code/Java/Security/EncryptUsername.htm */
public class Encrypt
{
private static Logger log = Logger.getLogger(Encrypt.class.getName());
public final static String accountSeperator = ":";
private static String key = "1234abcd";
private static String charset = "EUC-KR"; //"UTF-8";
public static void main(String[] args) throws Exception {
String encStr = encrypt("Hello 홍길동");
String decStr = decrypt(encStr);
System.out.println(encStr+":"+decStr);
}
private static String decrypt(String message) throws Exception {
byte[] bytesrc = convertHexString(message);
Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
DESKeySpec desKeySpec = new DESKeySpec(key.getBytes(charset));
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
IvParameterSpec iv = new IvParameterSpec(key.getBytes(charset));
cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);
byte[] retByte = cipher.doFinal(bytesrc);
return new String(retByte);
}
private static String encrypt(String message) throws Exception {
Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
DESKeySpec desKeySpec = new DESKeySpec(key.getBytes(charset));
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
IvParameterSpec iv = new IvParameterSpec(key.getBytes(charset));
cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);
return toHexString(cipher.doFinal(message.getBytes(charset)));
}
private static byte[] convertHexString(String ss) {
byte digest[] = new byte[ss.length() / 2];
for (int i = 0; i < digest.length; i++) {
String byteString = ss.substring(2 * i, 2 * i + 2);
int byteValue = Integer.parseInt(byteString, 16);
digest[i] = (byte) byteValue;
}
return digest;
}
private static String toHexString(byte b[]) {
StringBuffer hexString = new StringBuffer();
for (int i = 0; i < b.length; i++) {
String plainText = Integer.toHexString(0xff & b[i]);
if (plainText.length() < 2)
plainText = "0" + plainText;
hexString.append(plainText);
}
return hexString.toString();
}
public static String[] decodeAccount(String cookieValue) {
try {
String origi = Encrypt.decrypt(cookieValue);
String[] parts = origi.split(Encrypt.accountSeperator);
if (parts.length == 2 && !parts[0].equals("") && !parts[1].equals("")) {
return parts;
}
} catch (Exception e) {
e.printStackTrace();
log.warning(e.getMessage());
}
return null;
}
public static String encodeAccount(String username, String password) {
String encryptString = null;
try {
encryptString = Encrypt.encrypt(username + Encrypt.accountSeperator + password);
} catch (Exception e) {
log.warning(e.getMessage());
}
return encryptString;
}
}