Objective-C

Check if a MIME Tree Contains Signed Parts

Demonstrates the Chilkat Mime.ContainsSignedParts method, which returns whether the currently visible MIME tree contains a complete detached or opaque CMS/PKCS #7 signed entity. It takes no arguments.

Note: The file path is relative to the application's current working directory. Absolute paths may also be used. Supply the path to your own file.

Background: Where IsSigned asks whether the top entity is a signature wrapper, this scans the whole tree for a signed part nested anywhere inside — useful when signing is applied to a sub-part rather than the outermost entity. It is the discovery step before deciding whether verification is needed.

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Objective-C

#import <CkoMime.h>

BOOL success = NO;

//  Demonstrates the Mime.ContainsSignedParts method, which returns whether the MIME tree contains a complete CMS/PKCS #7 signed entity.  It takes no arguments.

CkoMime *mime = [[CkoMime alloc] init];
success = [mime LoadMimeFile: @"qa_data/message.eml"];
if (success == NO) {
    NSLog(@"%@",mime.LastErrorText);
    return;
}

if ([mime ContainsSignedParts]) {
    NSLog(@"%@",@"The message tree contains a signed part.");
}
else {
    NSLog(@"%@",@"The message tree contains no signed part.");
}