private void encSetBtn_Click(object sender, EventArgs e)
{
//shows the encryption form
encryptForm encForm = new encryptForm();
if (encForm.ShowDialog() == DialogResult.OK)
{
useSymmetric = encForm.rtnUseSymmetric;
useAsymmetric = encForm.rtnUseAsymmetric;
public_key = encForm.public_key;
SymmetricKey = encForm.SymmetricKey;
}
}
private void encSetBtn_Click(object sender, EventArgs e)
{
//shows the encryption form
encryptForm encForm = new encryptForm();
if (encForm.ShowDialog() == DialogResult.OK)
{
useSymmetric = encForm.rtnUseSymmetric;
useAsymmetric = encForm.rtnUseAsymmetric;
public_key = encForm.public_key;
SymmetricKey = encForm.SymmetricKey;
}
}
// The general function to encrypt a mail, depending on settings
// Uses asymmetric.cs and symmetric.cs functions
public static email encryptMail(email mail, bool useSymmetric, string symmetricKey, bool useAsymmetric, MerMail.Asymmetric.Key public_key)
{
// We are maybe going to modify contents in the mail, so we store it
email rtn = mail;
// We are maybe going to encrypt the symmetric key, so we store it too
string symKey = symmetricKey;
// We'll make it easy for the user to know, if the symmetric key
// is encrypted or not
string symKeyName = "symmetric_raw.txt";
string diagTitle = "Save symmetric key to file";
// We symmetricly encrypt the message body (if chosen)
if (useSymmetric)
{
// We'll encrypt the message, while we still know the symmetric key
rtn.body = MerMail.Symmetric.EncryptString(symKey, rtn.body);
// We asymmetricly encrypt the symmetric key (if chosen)
if (useAsymmetric)
{
symKey = MerMail.Asymmetric.EncryptString(symmetricKey, public_key);
// Now, we know that the symmetric key is encrypted, so we're
// going to tell the user that we encrypted it
symKeyName = "symmetric_encrypted.txt";
diagTitle = "Save encrypted symmetric key to file";
}
}
// Can be saved to any filetype (but we like .txt)
MerMail.Program.saveFile(symKeyName, diagTitle, "Any (*.*)", "*.*", symKey);
return(rtn);
}
// The general function to decrypt a mail, depending on settings
// Uses asymmetric.cs and symmetric.cs functions
public static email decryptMail(email mail, bool useSymmetric, string symmetricKey, bool useAsymmetric, MerMail.Asymmetric.Key privatekey)
{
// We are maybe going to modify contents in the mail, so we store it
email rtn = mail;
// We are maybe going to decrypt the symmetric key, so we store it too
string symKey = symmetricKey;
// We symmetricly decrypt the message body (if chosen)
if (useSymmetric)
{
// we asymmetricly decrypt the symmetric key (if chosen)
if (useAsymmetric)
{
symKey = MerMail.Asymmetric.DecryptString(symmetricKey, privatekey);
}
rtn.body = MerMail.Symmetric.DecryptString(symKey, rtn.body);
}
return(rtn);
}
