JavaDES加密解密算法

jopen 5年前

JavaDES加密解密算法
    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);            }        }