JavaDES加密解密算法
jopen
10年前
import java.nio.ByteBuffer; import java.security.SecureRandom; import javax.crypto.Cipher; import javax.crypto.SecretKey; import javax.crypto.SecretKeyFactory; import javax.crypto.spec.DESKeySpec; /** * * @author whzhaochao * * DES加密解密 * */ public class Main { public static void main(String[] args) throws Exception { // TODO Auto-generated method stub // 待加密内容 String str = "要加密的内容"; // 密码，长度要是8的倍数 String password = "9876543210"; String codeStr=CodeStr(str, password); System.out.println("原始内容："+str); System.out.println("加密内容："+codeStr); String deCodeStr=DcodeStr(codeStr, password); System.out.println("解密内容："+deCodeStr); } /** * * @param str 待加密字符串 * @param password 密码 * @return */ public static String CodeStr(String str,String password){ byte[] result = desCrypto(str.getBytes(), password); char[] chreslut=new char[result.length]; for(int i=0; i<result.length;i++){ char ch=(char) result[i]; chreslut[i]=ch; } String strres=new String(chreslut); return strres; } /** * * @param strres 待解密字符串 * @param password 密码 * @return * @throws Exception */ public static String DcodeStr(String strres,String password) throws Exception{ byte [] decode=new byte[strres.length()]; for(int i=0;i<strres.length();i++){ char ch=strres.charAt(i); byte b=(byte) ch; decode[i]=b; } byte[] decryResult = decrypt(decode, password); return new String(decryResult); } /** * * @param datasource * @param password * @return */ public static byte[] desCrypto(byte[] datasource, String password) { try { SecureRandom random = new SecureRandom(); DESKeySpec desKey = new DESKeySpec(password.getBytes()); // 创建一个密匙工厂，然后用它把DESKeySpec转换成 SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES"); SecretKey securekey = keyFactory.generateSecret(desKey); // Cipher对象实际完成加密操作 Cipher cipher = Cipher.getInstance("DES"); // 用密匙初始化Cipher对象 cipher.init(Cipher.ENCRYPT_MODE, securekey, random); // 现在，获取数据并加密 // 正式执行加密操作 return cipher.doFinal(datasource); } catch (Throwable e) { e.printStackTrace(); } return null; } /** * * @param src * @param password * @return * @throws Exception */ private static byte[] decrypt(byte[] src, String password) throws Exception { // DES算法要求有一个可信任的随机数源 SecureRandom random = new SecureRandom(); // 创建一个DESKeySpec对象 DESKeySpec desKey = new DESKeySpec(password.getBytes()); // 创建一个密匙工厂 SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES"); // 将DESKeySpec对象转换成SecretKey对象 SecretKey securekey = keyFactory.generateSecret(desKey); // Cipher对象实际完成解密操作 Cipher cipher = Cipher.getInstance("DES"); // 用密匙初始化Cipher对象 cipher.init(Cipher.DECRYPT_MODE, securekey, random); // 真正开始解密操作 return cipher.doFinal(src); } }