[FIX] Do not throw an error when encrypting symmetrically and there’s…

… no pubring.

Use FAILURE status code to detect encrypt/sign errors.
GPGErrorCancelled is more important than other error codes.
[#160 state:fixed assigned:mento]

Source/GPGController.m

@@ -374,9 +374,16 @@ - (void)processTo:(GPGStream *)output data:(GPGStream *)input withEncryptSignMod
 		gpgTask.outStream = output;
 		[gpgTask setInput:input];
 
-		// Check outData because gpg sometime returns an exitcode != 0, but the data is correct encrypted/signed.
-		if (([gpgTask start] != 0 && gpgTask.outData.length == 0) || gpgTask.errorCode) {
-			@throw [GPGException exceptionWithReason:localizedLibmacgpgString(@"Encrypt/sign failed!") gpgTask:gpgTask];
+		[gpgTask start];
+
+		// The status FAILURE is issued, whenever a sign or encrypt operation failed.
+		// gpgTask.errorCode is always set when FAILURE was issued.
+		// It is better to only use FAILURE and ignore exitcode and other status codes.
+		if (gpgTask.errorCode) {
+			NSArray *failures = gpgTask.statusDict[@"FAILURE"];
+			if ([failures isKindOfClass:[NSArray class]] && failures.count > 0) {
+				@throw [GPGException exceptionWithReason:localizedLibmacgpgString(@"Encrypt/sign failed!") gpgTask:gpgTask];
+			}
 		}
 	} @catch (NSException *e) {
 		[self handleException:e];

Source/GPGTask.m

@@ -431,7 +431,8 @@ - (void)setErrorCode:(int)value {
 	NSNumber *code = [NSNumber numberWithInt:value];
 	if (![errorCodes containsObject:code]) {
 		[errorCodes addObject:code];
-		if (!errorCode) {
+		// GPGErrorCancelled is the most important error code.
+		if (!errorCode || (value & 0xFFFF) == GPGErrorCancelled) {
 			errorCode = value;
 		}
 	}