private string SignBody(string body)
{
var canonicalizer = new DkimCanonicalizer();
var cb = canonicalizer.CanonicalizeBody(body, BodyCanonicalization);
var bytes = Encoding.GetBytes(cb);
if (SigningAlgorithm != DkimSigningAlgorithm.RSASha256)
{
throw new InvalidOperationException();
}
return(Convert.ToBase64String(SHA256.Hash(bytes)));
}
private string SignHeaders(MailHeader[] headers, MailHeader dkimHeader)
{
if (headers == null || headers.Length == 0)
{
throw new ArgumentException("headers");
}
var canonicalizer = new DkimCanonicalizer();
var ch = canonicalizer.CanonicalizeHeaders(
headers.Union(new[] { dkimHeader }).ToArray(),
HeaderCanonicalization);
if (SigningAlgorithm != DkimSigningAlgorithm.RSASha256)
{
throw new NotImplementedException();
}
var data = Encoding.GetBytes(ch.TrimEnd());
return(Convert.ToBase64String(RSA.Sign(data, privateKey)));
}