(Objective-C) Extract a File from a .p7m (PKCS7 Signed-Data)

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Objective-C example to extract the original file from a .p7m (Signed-Data PKCS7 Format) The .p7m contains the signed contents of the original file. It can be verified and restored by calling VerifyP7M.

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#import <CkoCrypt2.h>
#import <NSString.h>

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

CkoCrypt2 *crypt = [[CkoCrypt2 alloc] init];

// What is a .p7m file?

NSString *outputFile = @"/Users/chilkat/testData/pdf/sample.pdf";
NSString *inFile = @"/Users/chilkat/testData/p7m/sample.pdf.p7m";

// Verify and restore the original file:
BOOL success = [crypt VerifyP7M: inFile destPath: outputFile];
if (success == NO) {
    NSLog(@"%@",crypt.LastErrorText);
    return;
}

NSLog(@"%@",@"Success!");