java 加密工具类

左手的ㄟ右手 2022-10-11 13:51 163阅读 0赞

/** * 加密工具类 * @version 1.0 * @date 2019-09-02 0:41 * */
    public class EncryptUtils { 
        /** * 盐值生成的长度,需要的长度除以二 */
        private static final Integer saltLen=64;
    
        /** * 生成密文 MD5(MD5密码+128位盐值) * @param pwd MD5加密后的密码 * @return */
        public static String createCipher(String pwd,String salt){ 
            return String.valueOf(StrToMD5(pwd+salt));
        }
    
        /** * 生成一个128位的盐值 * @return 指定位数的盐值 */
        public static String createSalt(){ 
            SecureRandom ranGen = null;
            ranGen =new SecureRandom();
            byte[] aesKey = new byte[saltLen];
            ranGen.nextBytes(aesKey);
            StringBuffer hexString = new StringBuffer();
            for (int i = 0; i < aesKey.length; i++) { 
                String hex = Integer.toHexString(0xff & aesKey[i]);
                if (hex.length() == 1) { 
                    hexString.append('0');
                }
                hexString.append(hex);
            }
            return String.valueOf(hexString);
        }
    
        /** * 字符串转为MD5 * @param instr * @return */
        public static String StrToMD5(String instr) { 
            MessageDigest md5;
            try { 
                md5 = MessageDigest.getInstance("MD5");
            } catch (Exception e) { 
                return "";
            }
            char[] charArray = instr.toCharArray();
            byte[] byteArray = new byte[charArray.length];
            for (int i = 0; i < charArray.length; i++) { 
                byteArray[i] = (byte) charArray[i];
            }
            byte[] md5Bytes = md5.digest(byteArray);
            StringBuffer hexValue = new StringBuffer();
            for (int i = 0; i < md5Bytes.length; i++) { 
                int val = ((int) md5Bytes[i]) & 0xff;
                if (val < 16) { 
                    hexValue.append("0");
                }
                hexValue.append(Integer.toHexString(val));
            }
            return hexValue.toString();
        }
    
    }