C#加密算法HmacSHA256,SHA256_c# hmacsha256-优快云博客

本文链接：https://blog.youkuaiyun.com/mxj588love/article/details/78019697

本文介绍了一种使用SHA256算法进行字符串加密的方法，包括SHA256的直接应用、HMAC-SHA256签名算法及Base64编码的实现。通过具体的代码示例展示了如何将原始字符串转换为安全的密文形式。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

public static string SHA256Encrypt(string strIN)
{
    //string strIN = getstrIN(strIN);
    byte[] tmpByte;
    SHA256 sha256 = new SHA256Managed();
    tmpByte = sha256.ComputeHash(GetKeyByteArray(strIN));

    StringBuilder rst = new StringBuilder();
    for(int i = 0; i<tmpByte.Length; i++)
    {
        rst.Append(tmpByte[i].ToString("x2"));   
    }
    sha256.Clear();
    return rst.ToString();
    //return GetStringValue(tmpByte);
}

private static string GetStringValue(byte[] Byte)
{
    string tmpString = "";
    UTF8Encoding Asc = new UTF8Encoding();
    tmpString = Asc.GetString(Byte);
    return tmpString;
}

private static byte[] GetKeyByteArray(string strKey)
{
    UTF8Encoding Asc = new UTF8Encoding();
    int tmpStrLen = strKey.Length;
    byte[] tmpByte = new byte[tmpStrLen - 1];
    tmpByte = Asc.GetBytes(strKey);
    return tmpByte;
}

private static string HmacSHA256(string message, string secret)
{
    secret = secret ?? "";
    var encoding = new System.Text.UTF8Encoding();
    byte[] keyByte = encoding.GetBytes(secret);
    byte[] messageBytes = encoding.GetBytes(message);
    using (var hmacsha256 = new HMACSHA256(keyByte))
    {
        byte[] hashmessage = hmacsha256.ComputeHash(messageBytes);
        return Convert.ToBase64String(hashmessage);
    }
}

private static string Base64(string message)
{
    System.Text.Encoding encode = System.Text.Encoding.UTF8;
    byte[] bytedata = encode.GetBytes(message);
    string strPath = Convert.ToBase64String(bytedata, 0, bytedata.Length);
    return strPath;
}