一文让你轻松了解JAVA开发中的四种加密方法!
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内容图文
一、工具类
1. md5加密工具类
package 加密Tester.util;
import java.security.MessageDigest;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];
}
}2. base64加密工具类
package 加密Tester.util;
import org.apache.commons.codec.binary.Base64;import java.io.UnsupportedEncodingException;
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));
}
}3. Bcrypt工具类
package 加密Tester.util;import java.util.HashMap;import java.util.Map;import org.apache.commons.lang3.StringUtils;import org.mindrot.bcrypt.BCrypt;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<String, String> Bcrypt(final String encryptSource) {
String salt = BCrypt.gensalt(SALT_SEED);
Map<String, String> bcryptResult = Bcrypt(salt, encryptSource);
return bcryptResult;
}
/** *
* @param salt encrypt salt, Must conform to the rules
* @param encryptSource * @return */
public static Map<String, String> 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<String, String> bcryptResult = new HashMap<String, String>();
bcryptResult.put(SALT_KEY, salt);
bcryptResult.put(CIPHER_KEY, cipher);
return bcryptResult;
}
}二、加密测试
1. MD5加密测试
package 加密Tester;
import 加密Tester.util.MD5Utils;
/** * MD5加密 */
public class MD5Test {
public static void main(String[] args) {
String string = "我是一句话";
String byteArrayToHexString = MD5Utils.byteArrayToHexString(string.getBytes());
System.out.println(byteArrayToHexString);//e68891e698afe4b880e58fa5e8af9d
}
}2. base64加密测试
package 加密Tester;
import java.util.Base64;
import 加密Tester.util.Base64Util;
/** * base64加密 */
public class Bast64Tester {
public static void main(String[] args) {
String string = "我是一个字符串";
String encodeData = Base64Util.encodeData(string);
//加密
String decodeData = Base64Util.decodeData(encodeData);
//解密
System.out.println(encodeData);
//5oiR5piv5LiA5Liq5a2X56ym5Liy
System.out.println(decodeData);
//我是一个字符串
}
}3. SHA加密测试
package 加密Tester;
import org.apache.commons.codec.digest.Sha2Crypt;
/** * SHA加密 */public class ShaTest {
public static void main(String[] args) {
String string = "我是一句话";
String sha256Crypt = Sha2Crypt.sha256Crypt(string.getBytes());
System.out.println(sha256Crypt);//$5$AFoQTeyt$TiqmobvcQXjXaAQMYosAAO4KI8LfigZMGHzq.Dlp4NC
}
}4. BCrypt加密测试
package 加密Tester;
import java.security.SecureRandom;
import java.util.Map;
import java.util.UUID;
import 加密Tester.util.BcryptCipher;
import 加密Tester.util.MD5Utils;
/** * BCrypt加密 */public class BCryptTest {
public static void main(String[] args) {
String string = "我是一句话";
Map<String, String> 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<String, String> bcrypt2 = BcryptCipher.Bcrypt(bcrypt.get("salt"),string);
System.out.println(bcrypt2.get("SALT_KEY")); //null
System.out.println(bcrypt2.get("CIPHER_KEY")); //null
}
}内容总结
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