(C++) Find Certificate by Email Address

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Demonstrates how to find a certificate having the specified email address either within the cert's subject email, or the RFC822 name.

In an X.509 certificate, an email address can typically be located in two places:

1. RFC822 Name (Subject Alternative Name extension) -
   • The certificate may include an email address in the Subject Alternative Name (SAN) extension under the RFC822 Name field. This is a modern and preferred method because it allows for flexibility and alignment with security best practices.
   • To find it, Chilkat inspects the SAN extension in the certificate details.
2. Subject (Common Name or Email Address attribute) -
   • Older certificates may store the email address directly in the Subject field, typically under the Email Address attribute ("emailAddress") or, less commonly, the Common Name (CN).
   • This method is less preferred in modern standards but can still be encountered in legacy implementations. Chilkat also searches here for the email address.

Note: Requires Chilkat v10.1.2 or later.

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#include <CkCertStore.h>
#include <CkJsonObject.h>
#include <CkCert.h>

void ChilkatSample(void)
    {
    CkCertStore certStore;

    // This opens the Current User certificate store on Windows,
    // On MacOS and iOS it opens the default Keychain.
    bool readOnly = false;
    bool success = certStore.OpenCurrentUserStore(readOnly);
    if (success == false) {
        std::cout << certStore.lastErrorText() << "\r\n";
        return;
    }

    // Find the certificate having the specified email address in either the RFC822 Name or in the Subject.
    CkJsonObject json;
    const char *email_address = "joe@example.com";
    json.UpdateString("email",email_address);

    CkCert cert;
    success = certStore.FindCert(json,cert);
    if (success == true) {
        // Show the full distinguished name of the certificate.
        std::cout << "Found: " << cert.subjectDN() << "\r\n";
    }
    else {
        std::cout << "Not found." << "\r\n";
    }
    }