C# SHA加密

/// <summary>/// SHA512加密/// </summary>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();}/// <summary>/// SHA256加密/// </summary>public string Sha256HashFromString(string strData){    byte[] bytValue = System.Text.Encoding.UTF8.GetBytes(strData);    try    {       SHA256 sha256 = new SHA256CryptoServiceProvider();       byte[] retVal = sha256.ComputeHash(bytValue);       StringBuilder sb = new StringBuilder();       for (int i = 0; i < retVal.Length; i++)       {           sb.Append(retVal[i].ToString("x2"));       }       return sb.ToString();    }    catch (Exception ex)    {       throw new Exception(ex.Message);    }}