/// <summary>
/// Parses MIME message from the specified stream.
/// </summary>
/// <param name="stream">Stream from where to parse MIME message. Parsing starts from current stream position.</param>
/// <param name="headerEncoding">Header reading encoding. If not sure UTF-8 is recommended.</param>
/// <returns>Returns parsed MIME message.</returns>
/// <exception cref="ArgumentNullException">Is raised when <b>stream</b> or <b>headerEncoding</b> is null.</exception>
public static MIME_Message ParseFromStream(Stream stream, Encoding headerEncoding)
{
if (stream == null)
{
throw new ArgumentNullException("stream");
}
if (headerEncoding == null)
{
throw new ArgumentNullException("headerEncoding");
}
MIME_Message retVal = new MIME_Message();
retVal.Parse(new SmartStream(stream, false), headerEncoding, new MIME_h_ContentType("text/plain"));
return(retVal);
}
/// <summary>
/// Gets signed mime content. Value null means no content.
/// </summary>
/// <returns>Returns signed mime content. Value null means no content.</returns>
/// <remarks>This method is valid only if <b>Content-Type</b> parameter <b>smime-type=signed-data</b>.</remarks>
/// <exception cref="InvalidOperationException">Is raised when <b>smime-type != signed-data</b>.</exception>
public MIME_Message GetSignedMime()
{
if (!string.Equals(this.Entity.ContentType.Parameters["smime-type"], "signed-data", StringComparison.InvariantCultureIgnoreCase))
{
throw new InvalidOperationException("The VerifySignature method is only valid if Content-Type parameter smime-type=signed-data.");
}
if (this.Data != null)
{
SignedCms signedCms = new SignedCms();
signedCms.Decode(this.Data);
return(MIME_Message.ParseFromStream(new MemoryStream(signedCms.ContentInfo.Content)));
}
else
{
return(null);
}
}
/// <summary>
/// Decrypts enveloped mime content.
/// </summary>
/// <param name="cert">Decrypting certificate.</param>
/// <returns>Returns decrypted enveloped mime content.</returns>
/// <exception cref="ArgumentNullException">Is raised when <b>cert</b> is null reference.</exception>
/// <exception cref="InvalidOperationException">Is raised when <b>smime-type != enveloped-data</b>.</exception>
public MIME_Message GetEnvelopedMime(X509Certificate2 cert)
{
if (cert == null)
{
throw new ArgumentNullException("cert");
}
if (!string.Equals(this.Entity.ContentType.Parameters["smime-type"], "enveloped-data", StringComparison.InvariantCultureIgnoreCase))
{
throw new InvalidOperationException("The VerifySignature method is only valid if Content-Type parameter smime-type=enveloped-data.");
}
EnvelopedCms envelopedCms = new EnvelopedCms();
envelopedCms.Decode(this.Data);
X509Certificate2Collection certificates = new X509Certificate2Collection(cert);
envelopedCms.Decrypt(certificates);
return(MIME_Message.ParseFromStream(new MemoryStream(envelopedCms.Encode())));
}