The first one, DES encryption and decryption
import java.security.Key; import java.security.SecureRandom; import javax.crypto.Cipher; import javax.crypto.KeyGenerator; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import sun.misc.BASE64Decoder; import sun.misc.BASE64Encoder; /** * DES是一种对称加密算法，所谓对称加密算法:加密和解密使用相同的秘钥的算法 * @author llp * */ public class DESUtil { private static final Logger logger = LoggerFactory.getLogger(DESUtil.class); private static Key key; //设置秘钥key private static String KEY_STR="myKey"; private static String CHARSETNAME="UTF-8"; private static String ALGORITHM="DES"; static{ try{ //生成DES算法对象 KeyGenerator generator=KeyGenerator.getInstance(ALGORITHM); //运用SHA1安全策略 SecureRandom secureRandom=SecureRandom.getInstance("SHA1PRNG"); //设置上密钥种子 secureRandom.setSeed(KEY_STR.getBytes()); //初始化基于SHA1的算法对象 generator.init(secureRandom); //生成密钥对象 key=generator.generateKey(); generator=null; }catch(Exception e){ throw new RuntimeException(e); } } /** * 获取加密的信息 * @param str * @return */ public static String getEncryptString(String str){ //基于BASE64编码，接收byte[]并转换成String BASE64Encoder base64Encoder=new BASE64Encoder(); try { // 按UTF8编码 byte[] bytes = str.getBytes(CHARSETNAME); // 获取加密对象 Cipher cipher = Cipher.getInstance(ALGORITHM); // 初始化密码信息 cipher.init(Cipher.ENCRYPT_MODE, key); // 加密 byte[] doFinal = cipher.doFinal(bytes); // byte[]to encode好的String并返回 return base64Encoder.encode(doFinal); } catch (Exception e) { throw new RuntimeException(e); } } /** * 获取解密之后的信息 * * @param str * @return */ public static String getDecryptString(String str) { // 基于BASE64编码，接收byte[]并转换成String BASE64Decoder base64decoder = new BASE64Decoder(); try { // 将字符串decode成byte[] byte[] bytes = base64decoder.decodeBuffer(str); // 获取解密对象 Cipher cipher = Cipher.getInstance(ALGORITHM); // 初始化解密信息 cipher.init(Cipher.DECRYPT_MODE, key); // 解密 byte[] doFinal = cipher.doFinal(bytes); // 返回解密之后的信息 return new String(doFinal, CHARSETNAME); } catch (Exception e) { throw new RuntimeException(e); } } public static void main(String[] args) { //加密 logger.info(getEncryptString("root"));//WnplV/ietfQ= logger.info(getEncryptString("123456"));//QAHlVoUc49w= //解密 logger.info(getDecryptString(getEncryptString("root")));//root logger.info(getDecryptString(getEncryptString("123456")));//123456 } }
The second one, MD5 encryption
import java.security.MessageDigest; /** * MD5加密 * @author llp * */ public class MD5 { /** * 对传入的String进行MD5加密 * * @param s * @return */ public static final String getMd5(String s) { // 16进制数组 char hexDigits[] = { '5', '0', '5', '6', '2', '9', '6', '2', '5', 'q', 'b', 'l', 'e', 's', 's', 'y' }; try { char str[]; // 将传入的字符串转换成byte数组 byte strTemp[] = s.getBytes(); // 获取MD5加密对象 MessageDigest mdTemp = MessageDigest.getInstance("MD5"); // 传入需要加密的目标数组 mdTemp.update(strTemp); // 获取加密后的数组 byte md[] = mdTemp.digest(); int j = md.length; str = new char[j * 2]; int k = 0; // 将数组做位移 for (int i = 0; i < j; i++) { byte byte0 = md[i]; str[k++] = hexDigits[byte0 >>> 4 & 0xf]; str[k++] = hexDigits[byte0 & 0xf]; } // 转换成String并返回 return new String(str); } catch (Exception e) { return null; } } public static void main(String[] args) { System.out.println(MD5.getMd5("123456"));//s05bse6q2qlb9qblls96s592y55y556s } }
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