C++

Load a Public Key from a File

Demonstrates the Chilkat PublicKey.LoadFromFile method, which loads a public key from a file. The only argument is the file path. Chilkat examines the file content rather than the extension, accepting binary DER, PEM, Chilkat XML, JWK, and other supported representations.

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

Background: The most convenient loader when a key sits in a file of unknown format — it reads the bytes and detects DER, PEM, XML, or JWK without you having to match a format-specific method. Because it keys off content rather than the filename, a mislabeled extension does not trip it up. This is the pragmatic default for applications that accept public keys from users or varied sources.

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C++

#include <CkPublicKey.h>

void ChilkatSample(void)
    {
    bool success = false;

    //  Demonstrates the PublicKey.LoadFromFile method, which loads a public key from a file.  The only
    //  argument is the file path.  Chilkat examines the file content (not the extension), accepting
    //  binary DER, PEM, Chilkat XML, JWK, and other supported representations.

    CkPublicKey pubKey;

    success = pubKey.LoadFromFile("qa_data/public.pem");
    if (success == false) {
        std::cout << pubKey.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "Loaded a " << pubKey.keyType() << " public key." << "\r\n";
    }