gnupg: Scdaemon PKDECRYPT

 
 6.6.6 Decrypting data with a Smartcard
 --------------------------------------
 
 To decrypt some data the caller should use the command
 
       SETDATA HEXSTRING
 
    to tell 'scdaemon' about the data to be decrypted.  The data must be
 given in hex notation.  The actual decryption is then done using the
 command
 
        PKDECRYPT KEYID
 
    where KEYID is the hexified ID of the key to be used.
 
    If the card is aware of the apdding format a status line with padding
 information is send before the plaintext data.  The key for this status
 line is 'PADDING' with the only defined value being 0 and meaning
 padding has been removed.