Convert to DER encoded X.509 Certificate (.cer, .crt)

Loads a digital certificate from any format and saves to a binary DER encoded X.509 Certificate (.cer, .crt).

Download: Chilkat Cocoa Objective-C Libraries

NSMutableString *strOutput = [NSMutableString stringWithCapacity:1000];

CkoCert *cert = [[[CkoCert alloc] init] autorelease];

BOOL success;

//  LoadFromFile will load virtually any certificate format file.
//  It will auto-recognize the format and load appropiately.
//  In this case, load a PEM format certificate and convert to DER.
success = [cert LoadFromFile: @"/Users/chilkat/testData/pem/chilkat.pem"];
if (success != YES) {
    [strOutput appendString: cert.LastErrorText];
    [strOutput appendString: @"\n"];
    self.mainTextField.stringValue = strOutput;
    return;
}

success = [cert ExportCertDerFile: @"chilkat.der"];
if (success != YES) {
    [strOutput appendString: cert.LastErrorText];
    [strOutput appendString: @"\n"];
    self.mainTextField.stringValue = strOutput;
    return;
}

[strOutput appendString: @"Converted certificate from PEM to DER format."];
[strOutput appendString: @"\n"];

self.mainTextField.stringValue = strOutput;