(Tcl) Find Certificate by Email Address

See more Cert Store Examples

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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load ./chilkat.dll

set certStore [new_CkCertStore]

# This opens the Current User certificate store on Windows,
# On MacOS and iOS it opens the default Keychain.
set readOnly 0
set success [CkCertStore_OpenCurrentUserStore $certStore $readOnly]
if {$success == 0} then {
    puts [CkCertStore_lastErrorText $certStore]
    delete_CkCertStore $certStore
    exit
}

# Find the certificate having the specified email address in either the RFC822 Name or in the Subject.
set json [new_CkJsonObject]

set email_address "joe@example.com"
CkJsonObject_UpdateString $json "email" $email_address

set cert [new_CkCert]

set success [CkCertStore_FindCert $certStore $json $cert]
if {$success == 1} then {
    # Show the full distinguished name of the certificate.
    puts "Found: [CkCert_subjectDN $cert]"
} else {
    puts "Not found."
}


delete_CkCertStore $certStore
delete_CkJsonObject $json
delete_CkCert $cert