static void Main(string[] args)
{
Context ctx = new Context();
if (ctx.Protocol != Protocol.OpenPGP)
ctx.SetEngineInfo(Protocol.OpenPGP, null, null);
Console.WriteLine("Search Bob's and Alice's PGP keys in the default keyring..");
String[] searchpattern = new string[] {
"*****@*****.**",
"*****@*****.**" };
IKeyStore keyring = ctx.KeyStore;
/* Enable the listing of signatures. By default
* key signatures are NOT passed.
*/
ctx.KeylistMode = KeylistMode.Signatures;
// retrieve all keys that have Bob's or Alice's email address
Key[] keys = keyring.GetKeyList(searchpattern, false);
PgpKey bob = null, alice = null;
if (keys != null && keys.Length != 0)
{
foreach (Key k in keys)
{
if (k.Uid != null)
{
if (bob == null && k.Uid.Email.ToLower().Equals("*****@*****.**"))
bob = (PgpKey)k;
if (alice == null && k.Uid.Email.ToLower().Equals("*****@*****.**"))
alice = (PgpKey)k;
}
else
throw new InvalidKeyException();
}
}
if (bob == null || alice == null)
{
Console.WriteLine("Cannot find Bob's or Alice's PGP key in your keyring.");
Console.WriteLine("You may want to create the PGP key by using the appropriate\n"
+ "sample in the Samples/ directory.");
return;
}
// Print out all Uids from Bob's key
PrintUidData(bob);
// Print out all Uids from Alice's key
PrintUidData(alice);
Console.WriteLine("Set Alice's PGP key as signer key.");
// Clear signer list (remove default key)
ctx.Signers.Clear();
// Add Alice's key as signer
ctx.Signers.Add(alice);
/* Set the password callback - needed if the user doesn't run
* gpg-agent or any other password / pin-entry software.
*/
ctx.SetPassphraseFunction(new PassphraseDelegate(MyPassphraseCallback));
Console.WriteLine("Sign Bob's PGP key with Alice's key.. ");
/////// SIGN KEY ///////
PgpSignatureOptions signopts = new PgpSignatureOptions();
signopts.SelectedUids = new int[] { 1 }; // sign the latest Uid only!
signopts.TrustLevel = PgpSignatureTrustLevel.Full;
signopts.Type = PgpSignatureType.Trust | PgpSignatureType.NonExportable;
try
{
bob.Sign(ctx, signopts);
}
catch (AlreadySignedException)
{
Console.WriteLine("Bob's key is already signed!");
}
catch (Exception ex)
{
throw ex;
}
// Refresh Bob's key
bob = (PgpKey)keyring.GetKey(bob.Fingerprint, false);
PrintUidData(bob);
/////// REVOKE SIGNATURE ///////
Console.WriteLine("Revoke the signature..");
// We need to find Alice's signature first
int nsignature = 0;
foreach (KeySignature keysig in bob.Uid.Signatures)
{
if (!keysig.Revoked)
nsignature++; // do not count revocation certificates
if (keysig.KeyId.Equals(alice.KeyId) &&
!keysig.Revoked) // must not be a revocation certificate
break; // found!
}
PgpRevokeSignatureOptions revopts = new PgpRevokeSignatureOptions();
revopts.SelectedUid = 1; // latest uid
revopts.SelectedSignatures = new int[] { nsignature };
revopts.ReasonText = "Test revocation";
bob.RevokeSignature(ctx, revopts);
// Refresh Bob's key
bob = (PgpKey)keyring.GetKey(bob.Fingerprint, false);
PrintUidData(bob);
/////// DELETE SIGNATURE ///////
Console.WriteLine("Remove Alice's signature and revocation certificate(s)..");
List<int> siglst = new List<int>();
nsignature = 0;
foreach (KeySignature keysig in bob.Uid.Signatures)
{
nsignature++;
if (keysig.KeyId.Equals(alice.KeyId))
siglst.Add(nsignature);
}
PgpDeleteSignatureOptions delsigopts = new PgpDeleteSignatureOptions();
delsigopts.DeleteSelfSignature = false;
delsigopts.SelectedUid = 1 ;
delsigopts.SelectedSignatures = siglst.ToArray();
bob.DeleteSignature(ctx, delsigopts);
// Refresh Bob's key
bob = (PgpKey)keyring.GetKey(bob.Fingerprint, false);
PrintUidData(bob);
return;
}
public void RevokeSignature(Context ctx, PgpRevokeSignatureOptions options)
{
if (ctx == null)
throw new ArgumentNullException("No context object supplied.");
if (!ctx.IsValid)
throw new InvalidContextException("An invalid context has been supplied.");
if (options == null)
throw new ArgumentNullException("No revocation options specified.");
if (options.SelectedSignatures == null ||
options.SelectedSignatures.Length == 0)
throw new ArgumentException("No signatures selected.");
lock (settings.passLock)
{
lock (settings.revsigLock)
{
settings.revsigOptions = options;
// reset object
options.cmdSend = false;
options.uidSend = false;
options.reasonSend = false;
// reset reason text counter (gnupg prompts for each line)
options.nreasonTxt = 0;
/* reset own signature counter (user could have signed the key with more
* than one of his keys. */
options.nrevokenum = 0;
// specify key edit operation;
KeyEditOp op = KeyEditOp.RevokeSignature;
// output data
GpgmeData data = new GpgmeMemoryData();
int err;
try
{
err = StartEdit(ctx, (IntPtr)op, data);
}
catch (Exception ex)
{
throw ex;
}
gpg_err_code_t errcode = libgpgerror.gpg_err_code(err);
switch (errcode)
{
case gpg_err_code_t.GPG_ERR_NO_ERROR:
break;
case gpg_err_code_t.GPG_ERR_BAD_PASSPHRASE:
throw new BadPassphraseException(settings.passSettings.GetPassphraseInfo());
default:
throw new GpgmeException("An unknown error occurred. Error: "
+ err.ToString(), err);
}
}
}
}