(C++) Apple Keychain - Create RSA Signature

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Note: This example requires Chilkat v10.0.0 or greater.

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#include <CkCert.h>
#include <CkRsa.h>

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

    CkCert cert;

    // On MacOS and iOS, the LoadByCommonName function will search the Apple Keychain for the matching certificate.

    // A digital certificate's Common Name (CN) is a field in the certificate that specifies the name of the entity the 
    // certificate is issued to. It is often used to identify the domain name, hostname, or organization the certificate represents. 

    // For example:
    // - In an SSL/TLS certificate for a website, the CN typically contains the domain name (e.g., "www.example.com").
    // - For certificates representing individuals or organizations, the CN might include the person's name or the organization's name.

    // The CN is part of the certificate's Subject field and is crucial for verifying that the certificate corresponds 
    // to the intended entity, especially in SSL/TLS communications.

    bool success = cert.LoadByCommonName("Example, Inc.");
    if (success == false) {
        std::cout << cert.lastErrorText() << "\r\n";
        return;
    }

    CkRsa rsa;
    success = rsa.SetX509Cert(cert,true);
    if (success == false) {
        std::cout << rsa.lastErrorText() << "\r\n";
        return;
    }

    // Generate an RSA signature by signing the SHA-256 hash of the provided string, 
    // then return the signature encoded in Base64 format.
    rsa.put_EncodingMode("base64");
    const char *sigBase64 = rsa.signStringENC("to be signed","sha256");
    if (rsa.get_LastMethodSuccess() == false) {
        std::cout << rsa.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "RSA Signature:" << "\r\n";
    std::cout << sigBase64 << "\r\n";
    }