(Objective-C) PKCS7 Decrypt Using .pfx or .p12 Data

Demonstrates how to decrypt MIME using a specifc PFX file (.pfx or .p12) for the source of certificate(s) and private key(s).

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#import <CkoMime.h>
#import <CkoFileAccess.h>
#import <NSString.h>

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

CkoMime *mime = [[CkoMime alloc] init];

// Load the MIME
BOOL success = [mime LoadMimeFile: @"encrypted.mim"];
if (success == NO) {
    NSLog(@"%@",mime.LastErrorText);
    return;
}

NSData pfxData;
CkoFileAccess *fac = [[CkoFileAccess alloc] init];
pfxData = [fac ReadEntireFile: @"pfxStore/myPkcs12.p12"];
if (fac.LastMethodSuccess != YES) {
    NSLog(@"%@",fac.LastErrorText);
    return;
}

NSString *pfxPassword = @"myPassword";
success = [mime DecryptUsingPfxData: pfxData password: pfxPassword];
if (success == NO) {
    NSLog(@"%@",mime.LastErrorText);
    return;
}

// Display the decrypted MIME:
NSLog(@"%@",[mime GetMime]);

// Note: The MIME to be decrypted should look something like this
// when viewed in a text editor:
// (Note that the Content-Type is application/x-pkcs7-mime)

// Content-Disposition: attachment; filename="smime.p7m"
// Content-Transfer-Encoding: base64
// Content-Type: application/x-pkcs7-mime;
//  name="smime.p7m"
// 
// MIICRAYJKoZIhvcNAQcDoIICNTCCAjECAQAxggHIMIIBxAIBADCBqzCBlTELMAkGA1UEBhMCVVMx
// CzAJBgNVBAgTAlVUMRcwFQYDVQQHEw5TYWx0IExha2UgQ2l0eTEeMBwGA1UEChMVVGhlIFVTRVJU
// UlVTVCBOZXR3b3JrMSEwHwYDVQQLExhodHRwOi8vd3d3LnVzZXJ0cnVzdC5jb20xHTAbBgNVBAMT
// FFVUTi1VU0VSRmlyc3QtT2JqZWN0AhEA5vxolKNrYgp1Z7ABICdK+zANBgkqhkiG9w0BAQEFAASC
// AQAJ68jTh3u3ovsOuz1aHXTV90GBB6DMfCdx0bZ85trSvDXBevMOtQdctz653de8EB2xU4RlaPQa
// oBpF8G01PMaKezd+FGLbhm7gmKl7boej3BboUzM4wrwjc8qHTGc/haT1ZA3jUU3DR4emVXNmRgWc
// FDU5Dnkf+Z2YXQop9wPCf1Ng+8LLjBX9yxgXP1ZyFDe9vUnSkk2fmZatEY2Y6eWHNbrj6q4F40qN
// PAyZW1rJSFmKTSPSzv7S0VWBMh+FgUKtqk4I6/+zhneLYeJBZFskmMIGFpgKdgrN7vbbr1a2gv/M
// PbHUxwKMD4KZ2auyuGKMVLBOm+n8v5f8EegloL/UMGAGCSqGSIb3DQEHATAZBggqhkiG9w0DAjAN
// AgE6BAgcohHNLdl9FoA4q22x8vXs05wuScRgLhwMOzvdGQkBJx+6iQDBuoCVxF8sQ35g+0PPxN3M
// 6Zw6nI1gSIIKBS3ZjtI=