一文讓你輕鬆瞭解JAVA開發中的四種加密方法
阿新 • • 發佈：2019-08-17
文章目錄
一、工具類
- md5加密工具類
- base64加密工具類
- Bcrypt工具類
二、加密測試
- MD5加密測試
- base64加密測試
- SHA加密測試
- BCrypt加密測試
一、工具類
1. md5加密工具類
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 字元 * @param charsetname 編碼 * @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加密工具類
package 加密Tester.util; import org.apache.commons.codec.binary.Base64; import java.io.UnsupportedEncodingException; public class Base64Util { // 字串編碼 private static final String UTF_8 = "UTF-8"; /** * 加密字串 * @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; } /** * 解密加密後的字串 * @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工具類
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、加密測試
1. MD5加密測試
package 加密Tester;
import 加密Tester.util.MD5Utils;
/**
* MD5加密
*/
public class MD5Test {
public static void main(String[] args) {
String string = "我是一句話";
String byteArrayToHexString = MD5Utils.byteArrayToHexString(string.getBytes());
System.out.println(byteArrayToHexString);//e68891e698afe4b880e58fa5e8af9d
}
}
2. base64加密測試
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 = "我是一個字串";
String encodeData = Base64Util.encodeData(string); //加密
String decodeData = Base64Util.decodeData(encodeData); //解密
System.out.println(encodeData);//5oiR5piv5LiA5Liq5a2X56ym5Liy
System.out.println(decodeData);//我是一個字串
}
}
3. SHA加密測試
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 = "我是一句話";
String sha256Crypt = Sha2Crypt.sha256Crypt(string.getBytes());
System.out.println(sha256Crypt);//$5$AFoQTeyt$TiqmobvcQXjXaAQMYosAAO4KI8LfigZMGHzq.Dlp4NC
}
}
4. BCrypt加密測試
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 = "我是一句話";
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")); /