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

6.6.5 Signing data with a Smartcard
-----------------------------------

To sign some data the caller should use the command

      SETDATA HEXSTRING

   to tell 'scdaemon' about the data to be signed.  The data must be
given in hex notation.  The actual signing is done using the command

       PKSIGN KEYID

   where KEYID is the hexified ID of the key to be used.  The key id may
have been retrieved using the command 'LEARN'.  If another hash
algorithm than SHA-1 is used, that algorithm may be given like:

       PKSIGN --hash=ALGONAME KEYID

   With ALGONAME are one of 'sha1', 'rmd160' or 'md5'.