VBScript

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.

VBScript

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
'Create a Unicode (utf-16) output text file.
Set outFile = fso.CreateTextFile("output.txt", True, True)

success = 0

set certStore = CreateObject("Chilkat.CertStore")

' This opens the Current User certificate store on Windows,
' On MacOS and iOS it opens the default Keychain.
readOnly = 0
success = certStore.OpenCurrentUserStore(readOnly)
If (success = 0) Then
    outFile.WriteLine(certStore.LastErrorText)
    WScript.Quit
End If

' Find the certificate having the specified email address in either the RFC822 Name or in the Subject.
set json = CreateObject("Chilkat.JsonObject")
email_address = "joe@example.com"
success = json.UpdateString("email",email_address)

set cert = CreateObject("Chilkat.Cert")
success = certStore.FindCert(json,cert)
If (success = 1) Then
    ' Show the full distinguished name of the certificate.
    outFile.WriteLine("Found: " & cert.SubjectDN)
Else
    outFile.WriteLine("Not found.")
End If


outFile.Close