/// <summary>
/// 对邮件内容进行签名，如果出错将返回错误
/// </summary>
public Result <string> Sign(EMail_DKIM_RAW_EML eml)
{
var rtv = new Result <string>();
rtv.Value = "";
var body = eml.GetSignBody(true);
var signHeadNames = eml.SelectSignHeaderNames(SignHeaderNames);
var param = new List <string>();
param.Add("v=1");
param.Add("a=rsa-sha256");
param.Add("c=relaxed/relaxed");
param.Add("d=" + _EmailDomain);
param.Add("s=" + _EmailSelector);
param.Add("q=dns/txt");
param.Add("t=" + EMail_Unit.GetMS() / 1000);
param.Add("h=" + signHeadNames.join(":"));
param.Add("bh=" + Hash.SHA256.Base64(body));
param.Add("b=");
var paramStr = param.join("; ");
var signParams = eml.GetSignHeader(true, paramStr, null, signHeadNames);
if (signParams.IsError)
{
signParams.errorTo(rtv);
return(rtv);
}
rtv.Value = paramStr + _RSA.Sign("SHA256", signParams.Value);
return(rtv);
}
static private string GetRnd()
{
var now = EMail_Unit.GetMS();
if (now - UseTime > 30000) //30秒空闲更新一次
{
lock (Lock) {
now = EMail_Unit.GetMS();
if (now - UseTime > 30000)
{
Rnd = EMail_Unit.RandomStringMix(20);
UseTime = now;
}
}
}
UseTime = now;
return(Rnd);
}
/// <summary>
/// 用一个手写的key获取header里面的内容，因为header里面的key是什么样的完全无法知晓。
/// </summary>
public string GetHeader(string key)
{
var keysMp = FixedHeaderLowerKeys;
return(EMail_Unit.STR(_Headers[keysMp.getString(key.ToLower())]));
}
/// <summary>
/// Hash Base64
/// </summary>
public string Base64(byte[] byts)
{
return(EMail_Unit.Base64EncodeBytes(Bytes(byts)));
}