File: gnupg.info,  Node: Scdaemon PKDECRYPT,  Next: Scdaemon GETATTR,  Prev: Scdaemon PKSIGN,  Up: Scdaemon Protocol

6.6.6 Decrypting data with a Smartcard
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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.