DES加解密JAVA

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/*des java complied ok with eclipse 先建立一个DesEncrypt 类，然后把下面的代码复制上去，编译即可 */ import java.security.Key; import java.security.SecureRandom; import javax.crypto.Cipher; import javax.crypto.KeyGenerator; import sun.misc.BASE64Decoder; import sun.misc.BASE64Encoder; /** * * 使用DES加密与解密,可对byte[],String类型进行加密与解密 * 密文可使用String,byte[]存储. * * 方法: * void getKey(String strKey)从strKey的字条生成一个Key * * String getEncString(String strMing)对strMing进行加密,返回String密文 * String getDesString(String strMi)对strMin进行解密,返回String明文 * *byte[] getEncCode(byte[] byteS)byte[]型的加密 *byte[] getDesCode(byte[] byteD)byte[]型的解密 */ public class DesEncrypt { Key key; /** * 根据参数生成KEY * @param strKey */ public void getKey(String strKey) { try{ KeyGenerator _generator = KeyGenerator.getInstance("DES"); _generator.init(new SecureRandom(strKey.getBytes())); this.key = _generator.generateKey(); _generator=null; }catch(Exception e){ e.printStackTrace(); } } /** * 加密String明文输入,String密文输出 * @param strMing * @return */ public String getEncString(String strMing) { byte[] byteMi = null; byte[] byteMing = null; String strMi = ""; BASE64Encoder base64en = new BASE64Encoder(); try { byteMing = strMing.getBytes("UTF8"); byteMi = this.getEncCode(byteMing); strMi = base64en.encode(byteMi); } catch(Exception e) { e.printStackTrace(); } finally { base64en = null; byteMing = null; byteMi = null; } return strMi; } /** * 解密 以String密文输入,String明文输出 * @param strMi * @return */ public String getDesString(String strMi) { BASE64Decoder base64De = new BASE64Decoder(); byte[] byteMing = null; byte[] byteMi = null; String strMing = ""; try { byteMi = base64De.decodeBuffer(strMi); byteMing = this.getDesCode(byteMi); strMing = new String(byteMing, "UTF8"); } catch(Exception e) { e.printStackTrace(); } finally { base64De = null; byteMing = null; byteMi = null; } return strMing; } /** * 加密以byte[]明文输入,byte[]密文输出 * @param byteS * @return */ private byte[] getEncCode(byte[] byteS) { byte[] byteFina = null; Cipher cipher; try { cipher = Cipher.getInstance("DES"); cipher.init(Cipher.ENCRYPT_MODE, key); byteFina = cipher.doFinal(byteS); } catch(Exception e) { e.printStackTrace(); } finally { cipher = null; } return byteFina; } /** * 解密以byte[]密文输入,以byte[]明文输出 * @param byteD * @return */ private byte[] getDesCode(byte[] byteD) { Cipher cipher; byte[] byteFina=null; try{ cipher = Cipher.getInstance("DES"); cipher.init(Cipher.DECRYPT_MODE, key); byteFina = cipher.doFinal(byteD); }catch(Exception e){ e.printStackTrace(); }finally{ cipher=null; } return byteFina; } public static void main(String[] args){ System.out.println("des demo"); DesEncrypt des=new DesEncrypt();//实例化一个对像 des.getKey("MYKEY11");//生成密匙 System.out.println("key=MYKEY11"); String strEnc = des.getEncString("CHINA");//加密字符串,返回String的密文 System.out.println("密文=" strEnc); String strDes = des.getDesString(strEnc);//把String 类型的密文解密 System.out.println("明文=" strDes); } } /* 运行结果： des demo key=MYKEY11 密文=n2r7F/mmYiY= 明文=CHINA */