浅析Java 常用的 4 种加密方式（MD5+Base64+SHA+BCrypt）

一、工具类

 md5加密工具类 

public class MD5Utils {
 private static final String hexDigIts[] = {"0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"};
 
 public static String MD5Encode(String origin, String charsetname){
 String resultString = null;
 try{
  resultString = new String(origin);
  MessageDigest md = MessageDigest.getInstance("MD5");
  if(null == charsetname || "".equals(charsetname)){
  resultString = byteArrayToHexString(md.digest(resultString.getBytes()));
  }else{
  resultString = byteArrayToHexString(md.digest(resultString.getBytes(charsetname)));
  }
 }catch (Exception e){
 }
 return resultString;
 }
 public static String byteArrayToHexString(byte b[]){
 StringBuffer resultSb = new StringBuffer();
 for(int i = 0; i < b.length; i++){
  resultSb.append(byteToHexString(b[i]));
 }
 return resultSb.toString();
 }
 public static String byteToHexString(byte b){
 int n = b;
 if(n < 0){
  n += 256;
 }
 int d1 = n / 16;
 int d2 = n % 16;
 return hexDigIts[d1] + hexDigIts[d2];
 }
}

base64加密工具类

public class base64Util {
 // 字符串编码
 private static final String UTF_8 = "UTF-8";
 
 public static String decodeData(String inputData) {
 try {
  if (null == inputData) {
  return null;
  }
  return new String(base64.decodebase64(inputData.getBytes(UTF_8)), UTF_8);
 } catch (UnsupportedEncodingException e) {
 }
 return null;
 }
 
 public static String encodeData(String inputData) {
 try {
  if (null == inputData) {
  return null;
  }
  return new String(base64.encodebase64(inputData.getBytes(UTF_8)), UTF_8);
 } catch (UnsupportedEncodingException e) {
 }
 return null;
 }
 public static void main(String[] args) {
 System.out.println(base64Util.encodeData("我是中文"));
 String enStr = base64Util.encodeData("我是中文");
 System.out.println(base64Util.decodeData(enStr));
 }
}

 Bcrypt工具类

public class BcryptCipher {
 // generate salt seed
 private static final int SALT_SEED = 12;
 // the head fo salt
 private static final String SALT_STARTSWITH = "$2a$12";
 
 public static final String SALT_KEY = "salt";
 
 public static final String CIPHER_KEY = "cipher";
 
 
 public static Map Bcrypt(final String encryptSource) {
 String salt = BCrypt.gensalt(SALT_SEED);
 Map bcryptResult = Bcrypt(salt, encryptSource);
 return bcryptResult;
 }
 
 public static Map Bcrypt(final String salt, final String encryptSource) {
 if (StringUtils.isBlank(encryptSource)) {
 throw new RuntimeException("Bcrypt encrypt input params can not be empty");
 }
 
 if (StringUtils.isBlank(salt) || salt.length() != 29) {
 throw new RuntimeException("Salt can't be empty and length must be to 29");
 }
 if (!salt.startsWith(SALT_STARTSWITH)) {
 throw new RuntimeException("Invalid salt version, salt version is $2a$12");
 }
 
 String cipher = BCrypt.hashpw(encryptSource, salt);
 Map bcryptResult = new HashMap();
 bcryptResult.put(SALT_KEY, salt);
 bcryptResult.put(CIPHER_KEY, cipher);
 return bcryptResult;
 }
 
}

二、加密测试

MD5加密测试 

public class MD5Test {
 public static void main(String[] args) {
 String string = "你好 世界";
 String byteArrayToHexString = MD5Utils.byteArrayToHexString(string.getBytes());
 System.out.println(byteArrayToHexString);//e68891e698afe4b880e58fa5e8af9d
 
 }
}

base64加密测试 

public class Bast64Tester {
 
 public static void main(String[] args) {
 String string = "你好 世界";
 String encodeData = base64Util.encodeData(string); //加密
 String decodeData = base64Util.decodeData(encodeData); //解密
 System.out.println(encodeData);//5oiR5piv5LiA5Liq5a2X56ym5Liy
 System.out.println(decodeData);//你好 世界
 
 }
}

SHA加密测试 

public class ShaTest {
 
 public static void main(String[] args) {
 String string = "你好 世界";
 
 String sha256Crypt = Sha2Crypt.sha256Crypt(string.getBytes());
 System.out.println(sha256Crypt);//$5$AFoQTeyt$TiqmobvcQXjXaAQMYosAAO4KI8LfigZMGHzq.Dlp4NC
 
 }
}

BCrypt加密测试

public class BCryptTest {
 
 public static void main(String[] args) {
 
 String string = "你好世界";
 Map bcrypt = BcryptCipher.Bcrypt(string);
 System.out.println(bcrypt.keySet()); //[cipher, salt]
 
 System.out.println(bcrypt.get("cipher")); //$2a$12$ylb92Z84gqlrSfzIztlCV.dK0xNbw.pOv3UwXXA76llOsNRTJsE/.
 System.out.println(bcrypt.get("salt")); //$2a$12$ylb92Z84gqlrSfzIztlCV.
 
 Map bcrypt2 = BcryptCipher.Bcrypt(bcrypt.get("salt"),string);
 System.out.println(bcrypt2.get("SALT_KEY")); //null
 System.out.println(bcrypt2.get("CIPHER_KEY")); //null
 }
}

总结

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