2019-12-10 C#加密算法

/// <summary>
        /// 16位MD5加密
        /// </summary>
        /// <param name="password"></param>
        /// <returns></returns>
        public static string MD5Encrypt16(string password)
        {
            var md5 = new MD5CryptoServiceProvider();
            string t2 = BitConverter.ToString(md5.ComputeHash(Encoding.Default.GetBytes(password)), 4, 8);
            t2 = t2.Replace("-", "");
            return t2;
        }

        /// <summary>
        /// 32位MD5加密
        /// </summary>
        /// <param name="password"></param>
        /// <returns></returns>
        public static string MD5Encrypt32(string password)
        {
            string cl = password;
            string pwd = "";
            MD5 md5 = MD5.Create(); //实例化一个md5对像
            // 加密后是一个字节类型的数组，这里要注意编码UTF8/Unicode等的选择　
            byte[] s = md5.ComputeHash(Encoding.UTF8.GetBytes(cl));
            // 通过使用循环，将字节类型的数组转换为字符串，此字符串是常规字符格式化所得
            for (int i = 0; i < s.Length; i++)
            {
                // 将得到的字符串使用十六进制类型格式。格式后的字符是小写的字母，如果使用大写（X）则格式后的字符是大写字符 
                pwd = pwd + s[i].ToString("x2");
            }
            return pwd;
        }


        /// <summary>
        /// 64位MD5加密
        /// </summary>
        public static string MD5Encrypt64(string password)
        {
            string cl = password;
            //string pwd = "";
            MD5 md5 = MD5.Create(); //实例化一个md5对像
            // 加密后是一个字节类型的数组，这里要注意编码UTF8/Unicode等的选择　
            byte[] s = md5.ComputeHash(Encoding.UTF8.GetBytes(cl));
            return Convert.ToBase64String(s);
        }
        /// <summary>
        /// SHA1 加密 
        /// </summary>
        public static string SHA1Encrypt(string str)
        {
            var buffer = Encoding.UTF8.GetBytes(str);
            var data = SHA1.Create().ComputeHash(buffer);

            StringBuilder sub = new StringBuilder();
            foreach (var t in data)
            {
                sub.Append(t.ToString("X2"));
            }

            return sub.ToString();
        }
        /// <summary>
        /// SHA256 加密 
        /// </summary>
        public string SHA256ToBase64(string data)
        {
            byte[] bytes = Encoding.UTF8.GetBytes(data);
            byte[] hash = SHA256Managed.Create().ComputeHash(bytes);

            StringBuilder builder = new StringBuilder();
            for (int i = 0; i < hash.Length; i++)
            {
                builder.Append(hash[i].ToString("X2"));
            }

            return builder.ToString();
        }
        /// <summary>
        /// SHA512 加密 
        /// </summary>
        /// <param name="source"></param>
        /// <returns></returns>
        public static string sha512Encode(string source)
        {
            string result = "";
            byte[] buffer = Encoding.UTF8.GetBytes(source); //UTF-8 编码

            //64字节,512位          
            SHA512CryptoServiceProvider SHA512 = new SHA512CryptoServiceProvider();
            byte[] h5 = SHA512.ComputeHash(buffer);
            result = BitConverter.ToString(h5).Replace("-", string.Empty);
            return result.ToLower();
        }