Xbase++

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.

Xbase++

LOCAL nSuccess
LOCAL oCertStore
LOCAL nReadOnly
LOCAL oJson
LOCAL cEmail_address
LOCAL oCert

nSuccess := 0

oCertStore := CreateObject("Chilkat.CertStore")

//  This opens the Current User certificate store on Windows,
//  On MacOS and iOS it opens the default Keychain.
nReadOnly := 0
nSuccess := oCertStore:OpenCurrentUserStore(nReadOnly)
IF (nSuccess == 0)
    ? oCertStore:LastErrorText
    oCertStore:destroy()
    RETURN
ENDIF

//  Find the certificate having the specified email address in either the RFC822 Name or in the Subject.
oJson := CreateObject("Chilkat.JsonObject")
cEmail_address := "joe@example.com"
oJson:UpdateString("email", cEmail_address)

oCert := CreateObject("Chilkat.Cert")
nSuccess := oCertStore:FindCert(oJson, oCert)
IF (nSuccess == 1)
    //  Show the full distinguished name of the certificate.
    ? "Found: " + oCert:SubjectDN
ELSE
    ? "Not found."
ENDIF

oCertStore:destroy()
oJson:destroy()
oCert:destroy()