(Ruby) Find Certificate by Email Address

See more Cert Store Examples

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.

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

certStore = Chilkat::CkCertStore.new()

# This opens the Current User certificate store on Windows,
# On MacOS and iOS it opens the default Keychain.
readOnly = false
success = certStore.OpenCurrentUserStore(readOnly)
if (success == false)
    print certStore.lastErrorText() + "\n";
    exit
end

# Find the certificate having the specified email address in either the RFC822 Name or in the Subject.
json = Chilkat::CkJsonObject.new()
email_address = "joe@example.com"
json.UpdateString("email",email_address)

cert = Chilkat::CkCert.new()
success = certStore.FindCert(json,cert)
if (success == true)
    # Show the full distinguished name of the certificate.
    print "Found: " + cert.subjectDN() + "\n";
else
    print "Not found." + "\n";
end