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

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"};

/**

* MD5加密

* @param origin 字符

* @param charsetname 编码

* @return

*/

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";

/**

* 加密字符串

* @param inputData

* @return

*/

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;

}

/**

* 解密加密后的字符串

* @param inputData

* @return

*/

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";

/**

* Bcrypt encryption algorithm method

* @param encryptSource

* need to encrypt the string

* @return Map , two values in Map , salt and cipher

*/

public static Map Bcrypt(final String encryptSource) {

String salt = BCrypt.gensalt(SALT_SEED);

Map bcryptResult = Bcrypt(salt, encryptSource);

return bcryptResult;

}

/**

*

* @param salt encrypt salt, Must conform to the rules

* @param encryptSource

* @return

*/

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

/**

* MD5加密

*/

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

/**

* base64加密

*/

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

/**

* SHA加密

*/

publhttp://ic class ShaTest {

public static void main(String[] args) {

String string = "你好 世界";

String sha25http://6Crypt = Sha2Crypt.sha256Crypt(string.getBytes());

System.out.println(sha256Crypt);//$5$AFoQTeyt$TiqmobvcQXjXaAQMYosAAO4KI8LfigZMGHzq.Dlp4NC

}

}

BCrypt加密测试

/**

* BCrypt加密

*/

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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