gnupg: Scdaemon READCERT

 
 6.6.3 Return a certificate
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       READCERT HEXIFIED_CERTID|KEYID
 
    This function is used to read a certificate identified by
 HEXIFIED_CERTID from the card.  With OpenPGP cards the keyid 'OpenPGP.3'
 may be used to read the certificate of version 2 cards.