/// <summary>
/// Attempt to encrypt a message using PGP with the specified private key.
/// </summary>
/// <param name="recipientPublicKeys">Collection of BouncyCastle public keys to be used for encryption.</param>
/// <param name="symmetricKeyAlgorithmTag">The symmetric key algorithm tag to use for encryption.</param>
/// <returns>Whether the encryption completed successfully.</returns>
public bool PgpEncrypt(IEnumerable <PgpPublicKey> recipientPublicKeys, SymmetricKeyAlgorithmTag symmetricKeyAlgorithmTag = SymmetricKeyAlgorithmTag.TripleDes)
{
// Ensure a valid encoding.
if (BodyEncoding == null)
{
BodyEncoding = Encoding.UTF8;
}
// Attempt to encrypt.
bool encrypted;
using (MemoryStream encryptedMessageStream = new MemoryStream())
{
// Attempt to encrypt the message.
// OpaqueMail optional setting for protecting the subject.
if (SubjectEncryption && !Body.StartsWith("Subject: "))
{
encrypted = Pgp.Encrypt(BodyEncoding.GetBytes("Subject: " + Subject + "\r\n" + Body), encryptedMessageStream, "", recipientPublicKeys, symmetricKeyAlgorithmTag, true);
}
else
{
encrypted = Pgp.Encrypt(BodyEncoding.GetBytes(Body), encryptedMessageStream, "", recipientPublicKeys, symmetricKeyAlgorithmTag, true);
}
if (encrypted)
{
RawBody = BodyEncoding.GetString(encryptedMessageStream.ToArray());
}
}
// If the body was successfully encrypted, attempt to encrypt attachments.
if (encrypted)
{
// OpaqueMail optional setting for protecting the subject.
if (SubjectEncryption)
{
Subject = "PGP Encrypted Message";
}
foreach (Attachment attachment in Attachments)
{
// Don't process attachments with names ending in ".pgp".
if (!attachment.Name.ToLower().EndsWith(".pgp"))
{
using (MemoryStream attachmentStream = new MemoryStream())
{
encrypted = Pgp.Encrypt(attachment.ContentStream, attachmentStream, "", recipientPublicKeys);
if (encrypted)
{
attachment.ContentStream = attachmentStream;
attachment.Name += ".pgp";
}
}
}
}
}
return(encrypted);
}
/// <summary>
/// Attempt to encrypt a message using PGP with the specified private key.
/// </summary>
/// <param name="recipientPublicKeys">Collection of BouncyCastle public keys to be used for encryption.</param>
/// <param name="symmetricKeyAlgorithmTag">The symmetric key algorithm tag to use for encryption.</param>
/// <returns>Whether the encryption completed successfully.</returns>
public bool PgpEncrypt(IEnumerable <PgpPublicKey> recipientPublicKeys, SymmetricKeyAlgorithmTag symmetricKeyAlgorithmTag = SymmetricKeyAlgorithmTag.TripleDes)
{
// Ensure a valid encoding.
if (BodyEncoding == null)
{
BodyEncoding = Encoding.UTF8;
}
// Attempt to encrypt.
bool encrypted;
using (MemoryStream encryptedMessageStream = new MemoryStream())
{
// Attempt to encrypt the message.
encrypted = Pgp.Encrypt(BodyEncoding.GetBytes(Body), encryptedMessageStream, "", recipientPublicKeys, symmetricKeyAlgorithmTag, true);
if (encrypted)
{
rawBody = BodyEncoding.GetString(encryptedMessageStream.ToArray());
}
}
// If the body was successfully encrypted, attempt to encrypt attachments.
if (encrypted)
{
foreach (Attachment attachment in Attachments)
{
// Don't process attachments with names ending in ".pgp".
if (!attachment.Name.ToLower().EndsWith(".pgp"))
{
using (MemoryStream attachmentStream = new MemoryStream())
{
encrypted = Pgp.Encrypt(attachment.ContentStream, attachmentStream, "", recipientPublicKeys);
if (encrypted)
{
attachment.ContentStream = attachmentStream;
attachment.Name += ".pgp";
}
}
}
}
}
return(encrypted);
}